专栏首页山山仙人的专栏二进制搭建Kubernetes集群(最新v1.16.0版本)

二进制搭建Kubernetes集群(最新v1.16.0版本)

1、生产环境k8s平台架构

  • 单master集群
  • 多master集群(HA)

2、官方提供三种部署方式

  • minikube Minikube是一个工具,可以在本地快速运行一个单点的Kubernetes,仅用于尝试Kubernetes或日常开发的用户使用。 部署地址: https://kubernetes.io/docs/setup/minikube/
  • kubeadm Kubeadm也是一个工具,提供kubeadm init和kubeadm join,用于快速部署Kubernetes集群。 部署地址: https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm/
  • 二进制 推荐,从官方下载发行版的二进制包,手动部署每个组件,组成Kubernetes集群。 下载地址: https://github.com/kubernetes/kubernetes/releases

3、服务器规划

角色

IP

组件

k8s-master-01

192.168.2.10

kube-apiserver kube-controller-manager kube-scheduller etcd

k8s-node-01

192.168.2.11

kubelet kube-proxy docker etcd

k8s-node-02

192.168.2.12

kubelet kube-proxy docker etcd

4、系统初始化

  • 关闭防火墙:
systemctl stop firewalld
systemctl disable firewalld
  • 关闭selinux:
setenforce 0 # 临时
sed -i 's/enforcing/disabled/' /etc/selinux/config # 永久
  • 关闭swap:
swapoff -a  # 临时
vim /etc/fstab  # 永久
  • 同步系统时间:
ntpdate time.windows.com
  • 添加hosts:
vim /etc/hosts
192.168.2.10 k8s-master-01
192.168.2.11 k8s-node-01
192.168.2.12 k8s-node-02
  • 修改主机名:
hostnamectl set-hostname k8s-master-01

5、Etcd集群部署

5.1、安装cfssl工具

[root@k8s-master-01 ~]# curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
[root@k8s-master-01 ~]# curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
[root@k8s-master-01 ~]# curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
[root@k8s-master-01 ~]# chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo

在任意节点完成以下操作

5.2、生成etcd证书

[root@k8s-master-01 ~]# mkdir /usr/local/kubernetes/{k8s-cert,etcd-cert} -p
[root@master01 ~]# cd /usr/local/kubernetes/etcd-cert/

5.2.1 创建用来生成 CA 文件的 JSON 配置文件

[root@k8s-master-01 etcd-cert]# vim ca-config.json
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}

5.2.2 创建用来生成 CA 证书签名请求(CSR)的 JSON 配置文件

[root@k8s-master-01 etcd-cert]# vim ca-csr.json
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}

5.2.3 生成CA证书(ca.pem)和密钥(ca-key.pem)

[root@k8s-master-01 etcd-cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca
2019/10/07 18:14:49 [INFO] generating a new CA key and certificate from CSR
2019/10/07 18:14:49 [INFO] generate received request
2019/10/07 18:14:49 [INFO] received CSR
2019/10/07 18:14:49 [INFO] generating key: rsa-2048
2019/10/07 18:14:50 [INFO] encoded CSR
2019/10/07 18:14:50 [INFO] signed certificate with serial number 241296075377614671289689316194561193913636321821
[root@k8s-master-01 etcd-cert]# ls
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem

5.2.4 创建 etcd 证书签名请求

[root@k8s-master-01 etcd-cert]# vim server-csr.json
{
    "CN": "etcd",
    "hosts": [
        "192.168.2.10",
        "192.168.2.11",
        "192.168.2.12"
        ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}

5.2.5 生成etcd证书和私钥

[root@k8s-master-01 etcd-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
2019/10/07 18:18:00 [INFO] generate received request
2019/10/07 18:18:00 [INFO] received CSR
2019/10/07 18:18:00 [INFO] generating key: rsa-2048
2019/10/07 18:18:00 [INFO] encoded CSR
2019/10/07 18:18:00 [INFO] signed certificate with serial number 344196956354486691280839684095587396673015955849
2019/10/07 18:18:00 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master-01 etcd-cert]# ls
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem  server.csr  server-csr.json  server-key.pem  server.pem

5.3、部署etcd

5.3.1 etcd二进制包

下载地址:https://github.com/coreos/etcd/releases

[root@k8s-master-01 etcd-cert]# cd ..
[root@k8s-master-01 kubernetes]# mkdir soft
[root@k8s-master-01 kubernetes]# cd soft/
[root@k8s-master-01 soft]# tar xf etcd-v3.4.1-linux-amd64.tar.gz
[root@k8s-master-01 soft]# mkdir /opt/etcd/{bin,cfg,ssl} -p
[root@k8s-master-01 soft]# mv etcd-v3.4.1-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

5.3.2 设置etcd配置文件

[root@k8s-master-01 soft]# vim /opt/etcd/cfg/etcd.conf
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.2.10:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.2.10:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.2.10:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.2.10:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://192.168.2.10:2380,etcd-2=https://192.168.2.11:2380,etcd-3=https://192.168.2.12:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

说明: ETCD_NAME 节点名称 ETCD_DATA_DIR 数据目录 ETCD_LISTEN_PEER_URLS 集群通信监听地址 ETCD_LISTEN_CLIENT_URLS 客户端访问监听地址 ETCD_INITIAL_ADVERTISE_PEER_URLS 集群通告地址 ETCD_ADVERTISE_CLIENT_URLS 客户端通告地址 ETCD_INITIAL_CLUSTER 集群节点地址 ETCD_INITIAL_CLUSTER_TOKEN 集群Token ETCD_INITIAL_CLUSTER_STATE 加入集群的当前状态,new是新集群,existing表示加入已有集群

5.3.3 创建etcd系统服务

[root@master01 soft]# vim /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd \
        --name=${ETCD_NAME} \
        --data-dir=${ETCD_DATA_DIR} \
        --listen-peer-urls=${ETCD_LISTEN_PEER_URLS} \
        --listen-client-urls=${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
        --advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS} \
        --initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
        --initial-cluster=${ETCD_INITIAL_CLUSTER} \
        --initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN} \
        --initial-cluster-state=new \
        --cert-file=/opt/etcd/ssl/server.pem \
        --key-file=/opt/etcd/ssl/server-key.pem \
        --peer-cert-file=/opt/etcd/ssl/server.pem \
        --peer-key-file=/opt/etcd/ssl/server-key.pem \
        --trusted-ca-file=/opt/etcd/ssl/ca.pem \
        --peer-trusted-ca-file=/opt/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

5.3.4 拷贝证书

[root@k8s-master-01 soft]# cp ../etcd-cert/{ca,server-key,server}.pem /opt/etcd/ssl/

5.3.5 拷贝配置到其他节点并修改配置

[root@k8s-master-01 soft]# scp -r /opt/etcd/ root@192.168.2.11:/opt/
[root@k8s-master-01 soft]# scp -r /opt/etcd/ root@192.168.2.12:/opt/
[root@k8s-master-01 soft]# scp /usr/lib/systemd/system/etcd.service root@192.168.2.11:/usr/lib/systemd/system 
[root@k8s-master-01 soft]# scp /usr/lib/systemd/system/etcd.service root@192.168.2.12:/usr/lib/systemd/systemroot@172.16.1.66:/usr/lib/systemd/system
[root@k8s-node-01 ~]# vim /opt/etcd/cfg/etcd.conf
修改ETCD_NAME为节点的ETCD_NAME,url的ip地址为节点对应ip

5.3.6 启动并检查

在每个节点启动etcd并加入开机启动

systemctl daemon-reload 
systemctl start etcd.service 
systemctl enable etcd.service

检查集群状态

[root@k8s-master-01 bin]# /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem --cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.2.10:2379,https://192.168.2.11:2379,https://192.168.2.12:2379" cluster-health
member 272dad16f2666b47 is healthy: got healthy result from https://192.168.2.11:2379
member 2ab38a249cac7a26 is healthy: got healthy result from https://192.168.2.12:2379
member e99d560084d446c8 is healthy: got healthy result from https://192.168.2.10:2379
cluster is healthy

如上输出,则etcd部署没有问题

6、部署Master组件

6.1 生成证书

6.1.1 创建用来生成 CA 文件的 JSON 配置文件

[root@k8s-master-01 k8s-cert]# cd /usr/local/kubernetes/k8s-cert/
[root@k8s-master-01 k8s-cert]# vim ca-config.json
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}

6.1.2 创建用来生成 CA 证书签名请求(CSR)的 JSON 配置文件

[root@k8s-master-01 k8s-cert]# vim ca-csr.json
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
      	    "O": "k8s",
            "OU": "System"
        }
    ]
}

6.1.3 生成CA证书(ca.pem)和密钥(ca-key.pem)

[root@k8s-master-01 k8s-cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
2019/10/07 19:40:46 [INFO] generating a new CA key and certificate from CSR
2019/10/07 19:40:46 [INFO] generate received request
2019/10/07 19:40:46 [INFO] received CSR
2019/10/07 19:40:46 [INFO] generating key: rsa-2048
2019/10/07 19:40:46 [INFO] encoded CSR
2019/10/07 19:40:46 [INFO] signed certificate with serial number 588664830704961805809033488881742877285758664105
[root@k8s-master-01 k8s-cert]# ls
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem

6.1.4 生成api-server证书

证书签名请求文件中的hosts可以多规划一些,方便以后添加节点避免重新制作证书
[root@k8s-master-01 k8s-cert]# vim server-csr.json
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local",
      "192.168.2.10",
      "192.168.2.11",
      "192.168.2.12",
      "192.168.2.13",
      "192.168.2.14",
      "192.168.2.15"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
[root@k8s-master-01 k8s-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
2019/10/07 19:42:13 [INFO] generate received request
2019/10/07 19:42:13 [INFO] received CSR
2019/10/07 19:42:13 [INFO] generating key: rsa-2048
2019/10/07 19:42:13 [INFO] encoded CSR
2019/10/07 19:42:13 [INFO] signed certificate with serial number 662961272942353092215454648475276017019331528744
2019/10/07 19:42:13 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master-01 k8s-cert]# ls server
server.csr       server-csr.json  server-key.pem   server.pem

6.1.5 生成kube-proxy证书

[root@k8s-master-01 k8s-cert]# vim kube-proxy-csr.json
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
[root@k8s-master-01 k8s-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
2019/10/07 19:43:56 [INFO] generate received request
2019/10/07 19:43:56 [INFO] received CSR
2019/10/07 19:43:56 [INFO] generating key: rsa-2048
2019/10/07 19:43:57 [INFO] encoded CSR
2019/10/07 19:43:57 [INFO] signed certificate with serial number 213756085107124414330670553092451400314905460929
2019/10/07 19:43:57 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-master-01 k8s-cert]# ls kube-proxy
kube-proxy.csr       kube-proxy-csr.json  kube-proxy-key.pem   kube-proxy.pem

6.1.6 生成admin管理员证书

[root@master01 k8s-cert]# vim admin-csr.json
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
[root@master01 k8s-cert]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
[root@master01 k8s-cert]# ll admin
admin.csr       admin-csr.json  admin-key.pem   admin.pem

6.1.7 拷贝证书

[root@k8s-master-01 k8s-cert]# cp ca.pem ca-key.pem server.pem server-key.pem /opt/kubernetes/ssl/

6.2 创建TLSBootstrapping Token

[root@master01 k8s-cert]# cd /opt/kubernetes/cfg/
[root@master01 cfg]# head -c 16 /dev/urandom | od -An -t x | tr -d ' '
c47ffb939f5ca36231d9e3121a252940
[root@master01 cfg]# vim token.csv
c47ffb939f5ca36231d9e3121a252940,kubelet-bootstrap,10001,"system:node-bootstrapper"

6.3 准备二进制包

下载地址:https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.16.md

[root@master01 ~]# cd /usr/local/kubernetes/soft/
[root@master01 soft]# tar xf kubernetes-server-linux-amd64.tar.gz 
[root@master01 soft]# mkdir /opt/kubernetes/{bin,cfg,ssl,logs} -p
[root@master01 soft]# cd kubernetes/server/bin/
[root@master01 bin]# cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin/

6.4 部署kube-apiserver

6.4.1 创建apiserver配置文件

[root@k8s-master-01 bin]# cd /opt/kubernetes/cfg/
[root@k8s-master-01 cfg]# vim kube-apiserver
KUBE_APISERVER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--etcd-servers=https://192.168.2.10:2379,https://192.168.2.11:2379,https://192.168.2.12:2379 \
--bind-address=192.168.2.10 \
--secure-port=6443 \
--advertise-address=192.168.2.10 \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \
--enable-bootstrap-token-auth=true \
--token-auth-file=/opt/kubernetes/cfg/token.csv \
--service-node-port-range=30000-32767 \
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \
--tls-cert-file=/opt/kubernetes/ssl/server.pem  \
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \
--client-ca-file=/opt/kubernetes/ssl/ca.pem \
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/opt/etcd/ssl/ca.pem \
--etcd-certfile=/opt/etcd/ssl/server.pem \
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"

参数说明: --logtostderr 启用日志 ---v 日志等级 --etcd-servers etcd集群地址 --bind-address 监听地址 --secure-port https安全端口 --advertise-address 集群通告地址 --allow-privileged 启用授权 --service-cluster-ip-range Service虚拟IP地址段 --enable-admission-plugins 准入控制模块 --authorization-mode 认证授权,启用RBAC授权和节点自管理 --enable-bootstrap-token-auth 启用TLS bootstrap功能,后面会讲到 --token-auth-file token文件 --service-node-port-range Service Node类型默认分配端口范围

6.4.2 systemd管理apiserver

[root@k8s-master-01 cfg]# vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

6.4.3 启动apiserver

[root@k8s-master-01 cfg]# systemctl daemon-reload
[root@k8s-master-01 cfg]# systemctl enable kube-apiserver
[root@k8s-master-01 cfg]# systemctl restart kube-apiserver
[root@k8s-master-01 cfg]# systemctl status kube-apiserver

6.5 部署controller-manager

6.5.1 创建controller-manager配置文件

[root@k8s-master-01 cfg]# vim kube-controller-manager.conf 
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect=true \
--master=127.0.0.1:8080 \
--address=127.0.0.1 \
--allocate-node-cidrs=true \
--cluster-cidr=10.244.0.0/16 \
--service-cluster-ip-range=10.0.0.0/24 \
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \
--root-ca-file=/opt/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \
--experimental-cluster-signing-duration=87600h0m0s"

参数说明: --master 连接本地apiserver --leader-elect 当该组件启动多个时,自动选举(HA)

6.5.2 systemd管理controller-manager

[root@k8s-master-01 cfg]# vim /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

6.5.3 启动controller-manager

[root@master01 cfg]# systemctl daemon-reload
[root@master01 cfg]# systemctl enable kube-controller-manager
[root@master01 cfg]# systemctl restart kube-controller-manager
[root@master01 cfg]# systemctl status kube-controller-manager

6.6 部署kube-scheduler

6.6.1 创建kube-scheduler配置文件

[root@k8s-master-01 vim]# cat kube-scheduler.conf 
KUBE_SCHEDULER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect \
--master=127.0.0.1:8080 \
--address=127.0.0.1"

6.6.2 systemd管理kube-scheduler

[root@master01 cfg]# vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

6.6.3 启动kube-scheduler

[root@master01 cfg]# systemctl daemon-reload
[root@master01 cfg]# systemctl enable kube-scheduler
[root@master01 cfg]# systemctl restart kube-scheduler
[root@master01 cfg]# systemctl status kube-scheduler

6.6 给kubelet-bootstrap授权

Master apiserver启用TLS认证后,Node节点kubelet组件想要加入集群,必须使用CA签发的有效证书才能与apiserver通信,当Node节点很多时,签署证书是一件很繁琐的事情,因此有了TLS Bootstrapping机制,kubelet会以一个低权限用户自动向apiserver申请证书,kubelet的证书由apiserver动态签署。 TLS Bootstrapping认证机制:

[root@k8s-master-01 cfg]# kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created

6.7 检查集群状态

[root@master01 cfg]# cp /opt/kubernetes/bin/kubectl /usr/local/bin/
[root@master01 cfg]# kubectl get cs
NAME                 AGE
scheduler            <unknown>
controller-manager   <unknown>
etcd-0               <unknown>
etcd-1               <unknown>
etcd-2               <unknown>

7、部署Node组件

7.1、安装docker

docker二进制包下载地址:https://download.docker.com/linux/static/stable/x86_64/

[root@k8s-node-01 ~]# tar xf docker-18.09.6.tgz
[root@k8s-node-01 ~]# mv docker/* /usr/bin/
[root@k8s-node-01 ~]# mkdir /etc/docker
[root@k8s-node-01 ~]# cd /etc/docker
[root@k8s-node-01 ~]# vim /etc/docker/daemon.json 
{
    "registry-mirrors": ["http://bc437cce.m.daocloud.io"]
}
[root@k8s-node-01 ~]# vim /usr/lib/systemd/system/docker.service 
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service containerd.service
Wants=network-online.target

[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
StartLimitBurst=3
StartLimitInterval=60s
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity
Delegate=yes
KillMode=process

[Install]
WantedBy=multi-user.target
[root@k8s-node-01 ~]# systemctl daemon-reload 
[root@k8s-node-01 ~]# systemctl enable docker.service 
[root@k8s-node-01 ~]# systemctl start docker.service
[root@k8s-node-01 ~]# docker version
Client: Docker Engine - Community
 Version:           18.09.6
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        481bc77
 Built:             Sat May  4 02:33:34 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.6
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.8
  Git commit:       481bc77
  Built:            Sat May  4 02:41:08 2019
  OS/Arch:          linux/amd64
  Experimental:     false

7.2、准备二进制包

下载地址:https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.16.md

[root@k8s-node-01 ~]# cd /usr/local/kubernetes/soft/
[root@k8s-node-01 soft]# tar xf kubernetes-node-linux-amd64.tar.gz
[root@k8s-node-01 soft]# cd kubernetes/node/bin/
[root@k8s-node-01 soft]# mkdir /opt/kubernetes/{bin,cfg,ssl,logs} -p
[root@k8s-node-01 bin]# cp kubelet kube-proxy /opt/kubernetes/bin/

7.3、拷贝证书到node

[root@k8s-master-01 k8s-cert]# scp ca.pem kube-proxy.pem kube-proxy-key.pem root@192.168.2.11:/opt/kubernetes/ssl/

7.4、部署kubelet

7.4.1、创建kubelet配置文件

[root@k8s-node-01 opt]# vim /opt/kubernetes/cfg/kubelet.conf
KUBELET_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--hostname-override=k8s-node-01 \
--network-plugin=cni \
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
--config=/opt/kubernetes/cfg/kubelet-config.yml \
--cert-dir=/opt/kubernetes/ssl \
--pod-infra-container-image=mirrorgooglecontainers/pause-amd64:3.0"

参数说明: --hostname-override:指定节点注册到k8s中显示的节点名称 --network-plugin:启用网络插件 --bootstrap-kubeconfig 指定刚才生成的bootstrap.kubeconfig文件 --cert-dir 颁发证书存放位置 --pod-infra-container-image 管理Pod网络的镜像

7.4.2、创建bootstrap.kubeconfig文件

[root@k8s-node-01 opt]# vim /opt/kubernetes/cfg/bootstrap.kubeconfig 
apiVersion: v1
clusters:
- cluster:
    certificate-authority: /opt/kubernetes/ssl/ca.pem
    server: https://192.168.2.10:6443
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    user: kubelet-bootstrap
  name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kubelet-bootstrap
  user:
    token: c47ffb939f5ca36231d9e3121a252940

7.4.3、创建kubelet-config.yml文件

[root@k8s-node-01 opt]# vim /opt/kubernetes/cfg/kubelet-config.yml 
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local 
failSwapOn: false
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /opt/kubernetes/ssl/ca.pem 
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110

7.4.4、创建kubelet.kubeconfig文件

[root@k8s-node-01 cfg]# vim /opt/kubernetes/cfg/kubelet.kubeconfig
apiVersion: v1
clusters:
- cluster:
    certificate-authority: /opt/kubernetes/ssl/ca.pem
    server: https://192.168.2.10:6443
  name: default-cluster
contexts:
- context:
    cluster: default-cluster
    namespace: default
    user: default-auth
  name: default-context
current-context: default-context
kind: Config
preferences: {}
users:
- name: default-auth
  user:
    client-certificate: /opt/kubernetes/ssl/kubelet-client-current.pem
    client-key: /opt/kubernetes/ssl/kubelet-client-current.pem

7.4.5、systemd管理kubelet

[root@k8s-node-01 ~]# vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Before=docker.service

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

7.4.6、启动服务

[root@k8s-node-01 ~]# systemctl daemon-reload 
[root@k8s-node-01 ~]# systemctl enable kubelet.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@k8s-node-01 ~]# systemctl start kubelet.service

7.4.7、允许给Node颁发证书

[root@k8s-master-01 ~]# kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-xjZUw-J4jvu4ht0mtt05-lP3hYcQQHt-DEKkm-gRg4Y   80s   kubelet-bootstrap   Pending
[root@k8s-master-01 ~]# kubectl certificate approve node-csr-xjZUw-J4jvu4ht0mtt05-lP3hYcQQHt-DEKkm-gRg4Y
certificatesigningrequest.certificates.k8s.io/node-csr-xjZUw-J4jvu4ht0mtt05-lP3hYcQQHt-DEKkm-gRg4Y approved
[root@k8s-master-01 ~]# kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-xjZUw-J4jvu4ht0mtt05-lP3hYcQQHt-DEKkm-gRg4Y   94s   kubelet-bootstrap   Approved,Issued
[root@k8s-master-01 ~]# kubectl get nodes
NAME          STATUS     ROLES    AGE   VERSION
k8s-node-01   NotReady   <none>   7s    v1.16.0
[root@k8s-node-01 kubernetes]# ll /opt/kubernetes/ssl/
total 24
-rw-r--r-- 1 root root 1359 Oct  7 23:15 ca.pem
-rw------- 1 root root 1273 Oct  7 23:23 kubelet-client-2019-10-07-23-23-29.pem
lrwxrwxrwx 1 root root   58 Oct  7 23:23 kubelet-client-current.pem -> /opt/kubernetes/ssl/kubelet-client-2019-10-07-23-23-29.pem
-rw-r--r-- 1 root root 2185 Oct  7 23:22 kubelet.crt
-rw------- 1 root root 1675 Oct  7 23:22 kubelet.key
-rw------- 1 root root 1679 Oct  7 23:15 kube-proxy-key.pem
-rw-r--r-- 1 root root 1403 Oct  7 23:15 kube-proxy.pem

7.5、部署kube-proxy

7.5.1、创建kube-proxy配置文件

[root@k8s-node-01 opt]# vim /opt/kubernetes/cfg/kube-proxy.conf 
KUBE_PROXY_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"

7.5.2、创建kube-proxy.kubeconfig文件

[root@k8s-node-01 opt]# vim /opt/kubernetes/cfg/kube-proxy.kubeconfig 
apiVersion: v1
clusters:
- cluster:
    certificate-authority: /opt/kubernetes/ssl/ca.pem
    server: https://192.168.2.10:6443
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    user: kube-proxy
  name: default
current-context: default
kind: Config
preferences: {}
users:
- name: kube-proxy
  user:
    client-certificate: /opt/kubernetes/ssl/kube-proxy.pem
    client-key: /opt/kubernetes/ssl/kube-proxy-key.pem

7.5.3、创建kube-proxy-config.yml文件

[root@k8s-node-01 opt]# cat /opt/kubernetes/cfg/kube-proxy-config.yml 
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
address: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
  kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: k8s-node-01
clusterCIDR: 10.0.0.0/24
mode: ipvs
ipvs:
  scheduler: "rr"
iptables:
  masqueradeAll: true

7.5.4、systemd管理kube-proxy

[root@k8s-node-01 ~]# vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

7.5.5、启动服务

[root@k8s-node-01 kubernetes]# systemctl daemon-reload
[root@k8s-node-01 kubernetes]# systemctl enable kube-proxy.service 
[root@k8s-node-01 kubernetes]# systemctl start kube-proxy.service
[root@k8s-node-01 kubernetes]# systemctl status kube-proxy.service

7.6、部署另外一个node

步骤省略

7.7、部署cni网络插件

相关内容可参考:https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/

7.7.1、准备二进制包

下载地址:https://github.com/containernetworking/plugins/releases

[root@k8s-node-01 ~]# mkdir /opt/cni/bin -p
[root@k8s-node-01 ~]# mkdir /etc/cni/net.d -p
[root@k8s-node-01 soft]# tar xf cni-plugins-linux-amd64-v0.8.2.tgz -C /opt/cni/bin/

7.7.2、部署k8s集群网络

yaml文件下载地址https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml 确保yaml文件中的镜像地址可正常下载,json文件中的网络地址与集群规划中相符合

[root@k8s-master-01 ~]# cat kube-flannel.yml
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: psp.flannel.unprivileged
  annotations:
    seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
    seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
    apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
    apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
  privileged: false
  volumes:
    - configMap
    - secret
    - emptyDir
    - hostPath
  allowedHostPaths:
    - pathPrefix: "/etc/cni/net.d"
    - pathPrefix: "/etc/kube-flannel"
    - pathPrefix: "/run/flannel"
  readOnlyRootFilesystem: false
  # Users and groups
  runAsUser:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  fsGroup:
    rule: RunAsAny
  # Privilege Escalation
  allowPrivilegeEscalation: false
  defaultAllowPrivilegeEscalation: false
  # Capabilities
  allowedCapabilities: ['NET_ADMIN']
  defaultAddCapabilities: []
  requiredDropCapabilities: []
  # Host namespaces
  hostPID: false
  hostIPC: false
  hostNetwork: true
  hostPorts:
  - min: 0
    max: 65535
  # SELinux
  seLinux:
    # SELinux is unsed in CaaSP
    rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: flannel
rules:
  - apiGroups: ['extensions']
    resources: ['podsecuritypolicies']
    verbs: ['use']
    resourceNames: ['psp.flannel.unprivileged']
  - apiGroups:
      - ""
    resources:
      - pods
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes/status
    verbs:
      - patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: flannel
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: flannel
subjects:
- kind: ServiceAccount
  name: flannel
  namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: flannel
  namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-system
  labels:
    tier: node
    app: flannel
data:
  cni-conf.json: |
    {
      "name": "cbr0",
      "cniVersion": "0.3.1",
      "plugins": [
        {
          "type": "flannel",
          "delegate": {
            "hairpinMode": true,
            "isDefaultGateway": true
          }
        },
        {
          "type": "portmap",
          "capabilities": {
            "portMappings": true
          }
        }
      ]
    }
  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-amd64
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: beta.kubernetes.io/os
                    operator: In
                    values:
                      - linux
                  - key: beta.kubernetes.io/arch
                    operator: In
                    values:
                      - amd64
      hostNetwork: true
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.11.0-amd64
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel:v0.11.0-amd64
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
             add: ["NET_ADMIN"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run/flannel
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-arm64
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: beta.kubernetes.io/os
                    operator: In
                    values:
                      - linux
                  - key: beta.kubernetes.io/arch
                    operator: In
                    values:
                      - arm64
      hostNetwork: true
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.11.0-arm64
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel:v0.11.0-arm64
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
             add: ["NET_ADMIN"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run/flannel
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-arm
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: beta.kubernetes.io/os
                    operator: In
                    values:
                      - linux
                  - key: beta.kubernetes.io/arch
                    operator: In
                    values:
                      - arm
      hostNetwork: true
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.11.0-arm
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel:v0.11.0-arm
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
             add: ["NET_ADMIN"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run/flannel
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-ppc64le
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: beta.kubernetes.io/os
                    operator: In
                    values:
                      - linux
                  - key: beta.kubernetes.io/arch
                    operator: In
                    values:
                      - ppc64le
      hostNetwork: true
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.11.0-ppc64le
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel:v0.11.0-ppc64le
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
             add: ["NET_ADMIN"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run/flannel
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-s390x
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: beta.kubernetes.io/os
                    operator: In
                    values:
                      - linux
                  - key: beta.kubernetes.io/arch
                    operator: In
                    values:
                      - s390x
      hostNetwork: true
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: quay.io/coreos/flannel:v0.11.0-s390x
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: quay.io/coreos/flannel:v0.11.0-s390x
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
             add: ["NET_ADMIN"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run/flannel
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg
[root@k8s-master-01 ~]# kubectl apply -f kube-flannel.yml 
podsecuritypolicy.policy/psp.flannel.unprivileged created
clusterrole.rbac.authorization.k8s.io/flannel created
clusterrolebinding.rbac.authorization.k8s.io/flannel created
serviceaccount/flannel created
configmap/kube-flannel-cfg created
daemonset.apps/kube-flannel-ds-amd64 created
daemonset.apps/kube-flannel-ds-arm64 created
daemonset.apps/kube-flannel-ds-arm created
daemonset.apps/kube-flannel-ds-ppc64le created
daemonset.apps/kube-flannel-ds-s390x created
[root@k8s-master-01 ~]# kubectl get pods -n kube-system
NAME                          READY   STATUS    RESTARTS   AGE
kube-flannel-ds-amd64-6z2f8   1/1     Running   0          32s
kube-flannel-ds-amd64-qwb9h   1/1     Running   0          32s

创建角色绑定,授权查看日志

[root@k8s-master-01 ~]# kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes
[root@k8s-master-01 ~]# kubectl -n kube-system logs -f kube-flannel-ds-amd64-6z2f8

7.7.3、创建一个测试pod,查看是否成功

[root@k8s-master-01 ~]# kubectl create deployment test-nginx --image=nginx
deployment.apps/test-nginx created
[root@k8s-master-01 ~]# kubectl get pods 
NAME                          READY   STATUS              RESTARTS   AGE
test-nginx-7d97ffc85d-gzxrl   0/1     ContainerCreating   0          3s
[root@k8s-master-01 ~]# kubectl get pods -o wide
NAME                          READY   STATUS    RESTARTS   AGE   IP           NODE          NOMINATED NODE   READINESS GATES
test-nginx-7d97ffc85d-gzxrl   1/1     Running   0          48s   10.244.1.2   k8s-node-02   <none>           <none>
# 查看对应node上是否有cni网卡生成
[root@k8s-node-02 ~]# ifconfig cni0
cni0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
        inet 10.244.1.1  netmask 255.255.255.0  broadcast 10.244.1.255
        inet6 fe80::5c7c:daff:fe3f:a6bd  prefixlen 64  scopeid 0x20<link>
        ether 5e:7c:da:3f:a6:bd  txqueuelen 1000  (Ethernet)
        RX packets 1  bytes 28 (28.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 8  bytes 656 (656.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
# 暴露服务
[root@k8s-master-01 ~]# kubectl expose deployment test-nginx --port=80 --type=NodePort
service/test-nginx exposed
[root@k8s-master-01 ~]# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP        15h
test-nginx   NodePort    10.0.0.91    <none>        80:32089/TCP   26s
# 在node上通过nodeip:32089访问是否正常

7.8、授权apiserver访问kubelet

为提供安全性,kubelet禁止匿名访问,必须授权才可以访问

[root@k8s-master-01 ~]# vim apiserver-to-kubelet-rbac.yaml 
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:kube-apiserver-to-kubelet
rules:
  - apiGroups:
      - ""
    resources:
      - nodes/proxy
      - nodes/stats
      - nodes/log
      - nodes/spec
      - nodes/metrics
      - pods/log
    verbs:
      - "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:kube-apiserver
  namespace: ""
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kube-apiserver-to-kubelet
subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: User
    name: kubernetes
[root@k8s-master-01 ~]# kubectl apply -f apiserver-to-kubelet-rbac.yaml
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created

8、部署Web UI(Dashboard)

8.1、部署dashboard

地址:https://github.com/kubernetes/dashboard 文档:https://kubernetes.io/docs/tasks/access-application-cluster/web-ui-dashboard/ 部署最新版本v2.0.0-beta4,下载yaml

[root@k8s-master-01 ~]# wget -c https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta4/aio/deploy/recommended.yaml
# 修改service类型为nodeport
[root@k8s-master-01 ~]# vim recommended.yaml
...
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001
  selector:
    k8s-app: kubernetes-dashboard
...
[root@k8s-master-01 ~]# kubectl apply -f recommended.yaml 
namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
deployment.apps/dashboard-metrics-scraper created
[root@k8s-master-01 ~]# kubectl get pods -n kubernetes-dashboard
NAME                                         READY   STATUS    RESTARTS   AGE
dashboard-metrics-scraper-566cddb686-trqhd   1/1     Running   0          70s
kubernetes-dashboard-7b5bf5d559-8bzbh        1/1     Running   0          70s
[root@k8s-master-01 ~]# kubectl get svc -n kubernetes-dashboard    
NAME                        TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE
dashboard-metrics-scraper   ClusterIP   10.0.0.199   <none>        8000/TCP        81s
kubernetes-dashboard        NodePort    10.0.0.107   <none>        443:30001/TCP   81s
# 在node上通过https://nodeip:30001访问是否正常

8.2、创建service account并绑定默认cluster-admin管理员集群角色

[root@k8s-master-01 ~]# vim dashboard-adminuser.yaml 
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard
[root@k8s-master-01 ~]# kubectl apply -f dashboard-adminuser.yaml
serviceaccount/admin-user created
clusterrolebinding.rbac.authorization.k8s.io/admin-user created
# 获取token
[root@k8s-master-01 ~]# kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep admin-user | awk '{print $1}')
Name:         admin-user-token-24qrg
Namespace:    kubernetes-dashboard
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: admin-user
              kubernetes.io/service-account.uid: 4efbdf22-ef2b-485f-b177-28c085c71dc9

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1359 bytes
namespace:  20 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IlRMSFVUZGxOaU1zODRVdVptTkVnOV9wTEUzaGhZZDJVaVNzTndrZU9zUmsifQ.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.fM9b4zU45ZI1SsWhg9_v3z3-C6Y173Y3d1xUwp9GdFyTN3FSKfxwBMQbo2lC1mDick13dnqnnHoLzE55zTamGmJdWK_9HUbEV3qDgtCNYISujiQazfbAmv-ctWPU7RoWqiJ5MztK5K4g-mFTEJWNrb0KQjs1tCVvC3S3Es2VkCHztBoM0JM3WYrW0lyruQmDf5KeXn3mw_TBlAKd4A-EUYZJ27-eKLbRyGRjbvI4I93DaOlidXbXkRq3dJXKOKjveVUaleY20cog4_hAkiQWIiUFImrHhv23h9AfCO5z7JhgWXNWMKL9aZSf1PXuDutAymdyNjIKqlHwE4tc4EVS1Q

8.3、使用token登录到dashboard界面

9、部署集群内部DNS解析服务(CoreDNS)

DNS服务监视Kubernetes API,为每一个Service创建DNS记录用于域名解析。 ClusterIP A记录格式:..svc.cluster.local 示例:my-svc.my-namespace.svc.cluster.local 部署CoreDNS,修改官方yaml中的镜像地址,域名称cluster.local,dns的clusterip https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns/coredns

9.1、部署coredns

下载yaml,修改配置

[root@k8s-master-01 ~]# cat coredns.yaml
# Warning: This is a file generated from the base underscore template file: coredns.yaml.base

apiVersion: v1
kind: ServiceAccount
metadata:
  name: coredns
  namespace: kube-system
  labels:
      kubernetes.io/cluster-service: "true"
      addonmanager.kubernetes.io/mode: Reconcile
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    addonmanager.kubernetes.io/mode: Reconcile
  name: system:coredns
rules:
- apiGroups:
  - ""
  resources:
  - endpoints
  - services
  - pods
  - namespaces
  verbs:
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    addonmanager.kubernetes.io/mode: EnsureExists
  name: system:coredns
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:coredns
subjects:
- kind: ServiceAccount
  name: coredns
  namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system
  labels:
      addonmanager.kubernetes.io/mode: EnsureExists
data:
  Corefile: |
    .:53 {
        errors
        health
        kubernetes cluster.local in-addr.arpa ip6.arpa {
            pods insecure
            upstream
            fallthrough in-addr.arpa ip6.arpa
        }
        prometheus :9153
        proxy . /etc/resolv.conf
        cache 30
        loop
        reload
        loadbalance
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  # replicas: not specified here:
  # 1. In order to make Addon Manager do not reconcile this replicas parameter.
  # 2. Default is 1.
  # 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
      annotations:
        seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
    spec:
      serviceAccountName: coredns
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
        - key: "CriticalAddonsOnly"
          operator: "Exists"
      containers:
      - name: coredns
        image: lizhenliang/coredns:1.2.2
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            memory: 170Mi
          requests:
            cpu: 100m
            memory: 70Mi
        args: [ "-conf", "/etc/coredns/Corefile" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
          readOnly: true
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9153
          name: metrics
          protocol: TCP
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - all
          readOnlyRootFilesystem: true
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
            - key: Corefile
              path: Corefile
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: 10.0.0.2 
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP
[root@k8s-master-01 ~]# kubectl apply -f coredns.yaml 
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
[root@k8s-master-01 ~]# kubectl get pods -n kube-system
NAME                          READY   STATUS    RESTARTS   AGE
coredns-6d8cfdd59d-czx9w      1/1     Running   0          7s
kube-flannel-ds-amd64-6z2f8   1/1     Running   0          120m
kube-flannel-ds-amd64-qwb9h   1/1     Running   0          120m

9.2、测试dns是否可用

[root@k8s-master-01 ~]# vim bs.yaml 
apiVersion: v1
kind: Pod
metadata: 
    name: busybox
    namespace: default
spec:
    containers:
      - image: busybox:1.28.4
        command:
          - sleep
          - "3600"
        imagePullPolicy: IfNotPresent
        name: busybox
    restartPolicy: Always
[root@k8s-master-01 ~]# kubectl apply -f bs.yaml 
pod/busybox created
[root@k8s-master-01 ~]# kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
busybox                       1/1     Running   0          16s
[root@k8s-master-01 YAML]# kubectl exec -it busybox sh
/ # nslookup kubernetes
Server:    10.0.0.2
Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.0.0.1 kubernetes.default.svc.cluster.local
/ # nslookup kubernetes.default.svc.cluster.local
Server:    10.0.0.2
Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes.default.svc.cluster.local
Address 1: 10.0.0.1 kubernetes.default.svc.cluster.local
/ # nslookup www.baidu.com
Server:    10.0.0.2
Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local

Name:      www.baidu.com
Address 1: 220.181.38.150
Address 2: 220.181.38.149

至此、二进制搭建最新1.16.0版本的kubernetes集群完成。

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