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rancher导入rke 原

一、搭建RKE集群

1.1 概述

    REK是Rancher Kubernetes Engine,通过rke工具可以快速简单地搭建一套 Kubernetes集群。

    搭建的重点在于环境,如果环境配置正确,一切都会很顺利。

1.2 环境准备

    首先说明下依赖版本:    

序号

名称

版本

备注

1

ubuntu

16.04.1

2

docker

17.03.2-ce

3

rke

0.1.1

4

k8s

1.8.7

5

rancher

2.0.0-alpha16

    然后开始准备环境,注意需要两台机器,一台用于安装rke集群,一台用于rke工具控制机。注意控制机最好和rke集群执行同样的环境准备,否则有可能出现莫名安装不上的问题。

    1、初装的ubuntu自带的编辑命令不太好用,这里卸载原来的,然后安装vi

#此时未使用root登陆,需要增加sudo,以获取root权限
#首先卸载旧版本的vi编辑器:
sudo apt-get remove vim-common
#然后安装新版vi即可:
$sudo apt-get install vim

    2、ubuntu默认不允许使用root登陆,为了减少不必要的麻烦,这里修改配置启用root,然后以后所有步骤都在root用户下操作。

#1、将PermitRootLogin prohibit-password修改为PermitRootLogin yes
#2、取消注释AuthorizedKeysFile      %h/.ssh/authorized_keys
sudo vi /etc/ssh/sshd_config 
#3、切换到root登陆
sudo su
#4、设置root密码
sudo passwd root
#5、更新密码
sudo passwd -u root
#6、重启ssh
sudo service ssh restart

    修改完后,使用root登陆,重新打开客户端。

    3、修改主机名,注意不能包含大写字母,并且最好不要包含特殊字符,修改完后重启机器。

vi /etc/hostname 

    4、确保hosts文件包含如下行

127.0.0.1      localhost

    另外ubuntu会把主机名对应127.0.0.1加入到hosts里,第三步我们改了名称,所以hosts也要相应改变,但注意IP要改为真实IP

172.16.10.99       worker02

    5、启用cgroup内存和Swap限额,修改/etc/default/grub 配置文件,修改/增加两项

GRUB_CMDLINE_LINUX_DEFAULT="cgroup_enable=memory swapaccount=1"
GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"

    修改完后执行

update-grub

    执行完后,再次重启机器。

    6、永久禁用交换分区,直接修改/etc/fstab文件,注释掉swap项

# swap was on /dev/sda6 during installation
#UUID=5e4b0d14-ad10-4d24-8f7c-4a07c4eb4d29 none            swap    sw              0       0

    7、其他的检查防火墙(默认无规则)、SELinux(默认未启用)、ipv4转发(默认已启用)、配置rke控制机到rke集群机器的单向免密登陆

    8、下载安装docker17.03.2-ce版本(https://docs.docker.com/install/linux/docker-ce/ubuntu/#upgrade-docker-ce),最好再设置加速器,不然下载镜像会很慢。最后将root再添加到docker用户组中。

1.3安装rke

    rke的github地址是https://github.com/rancher/rke,点击到releases页面,下载rke工具。下载成功后,无需其他操作,只需要赋权即可使用。

chmod 777 rke
#验证安装
./rke -version

 1.4部署rke集群

    1、重启一下机器(为什么重启?不知道,偶发装不上,重启就好了,这里为了确保成功,先重启下。)

    2、创建cluster.yml文件,内容类似如下:

nodes:
  - address: 172.16.10.99
    user: root
    role: [controlplane,worker,etcd]
services:
  etcd:
    image: quay.io/coreos/etcd:latest
  kube-api:
    image: rancher/k8s:v1.8.3-rancher2
  kube-controller:
    image: rancher/k8s:v1.8.3-rancher2
  scheduler:
    image: rancher/k8s:v1.8.3-rancher2
  kubelet:
    image: rancher/k8s:v1.8.3-rancher2
  kubeproxy:
    image: rancher/k8s:v1.8.3-rancher2

    注意etcd的那个镜像,不要更换其他etcd镜像,更换会导致启动403错误。quay.io的镜像比较慢,可以先pull下来,但绝对不能换。

    3、执行

./rke  up --config cluster.yml

执行结果如下:

root@master:/opt/rke# ./rke up --config cluster-99.yml
INFO[0000] Building Kubernetes cluster                  
INFO[0000] [dialer] Setup tunnel for host [172.16.10.99] 
INFO[0000] [network] Deploying port listener containers 
INFO[0001] [network] Successfully started [rke-etcd-port-listener] container on host [172.16.10.99] 
INFO[0001] [network] Successfully started [rke-cp-port-listener] container on host [172.16.10.99] 
INFO[0002] [network] Successfully started [rke-worker-port-listener] container on host [172.16.10.99] 
INFO[0002] [network] Port listener containers deployed successfully 
INFO[0002] [network] Running all -> etcd port checks    
INFO[0003] [network] Successfully started [rke-port-checker] container on host [172.16.10.99] 
INFO[0004] [network] Successfully started [rke-port-checker] container on host [172.16.10.99] 
INFO[0004] [network] Running control plane -> etcd port checks 
INFO[0005] [network] Successfully started [rke-port-checker] container on host [172.16.10.99] 
INFO[0005] [network] Running workers -> control plane port checks 
INFO[0005] [network] Successfully started [rke-port-checker] container on host [172.16.10.99] 
INFO[0006] [network] Checking KubeAPI port Control Plane hosts 
INFO[0006] [network] Removing port listener containers  
INFO[0006] [remove/rke-etcd-port-listener] Successfully removed container on host [172.16.10.99] 
INFO[0007] [remove/rke-cp-port-listener] Successfully removed container on host [172.16.10.99] 
INFO[0007] [remove/rke-worker-port-listener] Successfully removed container on host [172.16.10.99] 
INFO[0007] [network] Port listener containers removed successfully 
INFO[0007] [certificates] Attempting to recover certificates from backup on host [172.16.10.99] 
INFO[0007] [certificates] No Certificate backup found on host [172.16.10.99] 
INFO[0007] [certificates] Generating kubernetes certificates 
INFO[0007] [certificates] Generating CA kubernetes certificates 
INFO[0008] [certificates] Generating Kubernetes API server certificates 
INFO[0008] [certificates] Generating Kube Controller certificates 
INFO[0009] [certificates] Generating Kube Scheduler certificates 
INFO[0011] [certificates] Generating Kube Proxy certificates 
INFO[0011] [certificates] Generating Node certificate   
INFO[0012] [certificates] Generating admin certificates and kubeconfig 
INFO[0012] [certificates] Generating etcd-172.16.10.99 certificate and key 
INFO[0013] [certificates] Temporarily saving certs to etcd host [172.16.10.99] 
INFO[0018] [certificates] Saved certs to etcd host [172.16.10.99] 
INFO[0018] [reconcile] Reconciling cluster state        
INFO[0018] [reconcile] This is newly generated cluster  
INFO[0018] [certificates] Deploying kubernetes certificates to Cluster nodes 
INFO[0024] Successfully Deployed local admin kubeconfig at [./kube_config_cluster-99.yml] 
INFO[0024] [certificates] Successfully deployed kubernetes certificates to Cluster nodes 
INFO[0024] Pre-pulling kubernetes images                
INFO[0024] Kubernetes images pulled successfully        
INFO[0024] [etcd] Building up Etcd Plane..              
INFO[0025] [etcd] Successfully started [etcd] container on host [172.16.10.99] 
INFO[0025] [etcd] Successfully started Etcd Plane..     
INFO[0025] [controlplane] Building up Controller Plane.. 
INFO[0026] [controlplane] Successfully started [kube-api] container on host [172.16.10.99] 
INFO[0026] [healthcheck] Start Healthcheck on service [kube-api] on host [172.16.10.99] 
INFO[0036] [healthcheck] service [kube-api] on host [172.16.10.99] is healthy 
INFO[0037] [controlplane] Successfully started [kube-controller] container on host [172.16.10.99] 
INFO[0037] [healthcheck] Start Healthcheck on service [kube-controller] on host [172.16.10.99] 
INFO[0037] [healthcheck] service [kube-controller] on host [172.16.10.99] is healthy 
INFO[0038] [controlplane] Successfully started [scheduler] container on host [172.16.10.99] 
INFO[0038] [healthcheck] Start Healthcheck on service [scheduler] on host [172.16.10.99] 
INFO[0038] [healthcheck] service [scheduler] on host [172.16.10.99] is healthy 
INFO[0038] [controlplane] Successfully started Controller Plane.. 
INFO[0038] [authz] Creating rke-job-deployer ServiceAccount 
INFO[0038] [authz] rke-job-deployer ServiceAccount created successfully 
INFO[0038] [authz] Creating system:node ClusterRoleBinding 
INFO[0038] [authz] system:node ClusterRoleBinding created successfully 
INFO[0038] [certificates] Save kubernetes certificates as secrets 
INFO[0039] [certificates] Successfully saved certificates as kubernetes secret [k8s-certs] 
INFO[0039] [state] Saving cluster state to Kubernetes   
INFO[0039] [state] Successfully Saved cluster state to Kubernetes ConfigMap: cluster-state 
INFO[0039] [worker] Building up Worker Plane..          
INFO[0039] [sidekick] Sidekick container already created on host [172.16.10.99] 
INFO[0040] [worker] Successfully started [kubelet] container on host [172.16.10.99] 
INFO[0040] [healthcheck] Start Healthcheck on service [kubelet] on host [172.16.10.99] 
INFO[0046] [healthcheck] service [kubelet] on host [172.16.10.99] is healthy 
INFO[0046] [worker] Successfully started [kube-proxy] container on host [172.16.10.99] 
INFO[0046] [healthcheck] Start Healthcheck on service [kube-proxy] on host [172.16.10.99] 
INFO[0052] [healthcheck] service [kube-proxy] on host [172.16.10.99] is healthy 
INFO[0052] [sidekick] Sidekick container already created on host [172.16.10.99] 
INFO[0052] [healthcheck] Start Healthcheck on service [kubelet] on host [172.16.10.99] 
INFO[0052] [healthcheck] service [kubelet] on host [172.16.10.99] is healthy 
INFO[0052] [healthcheck] Start Healthcheck on service [kube-proxy] on host [172.16.10.99] 
INFO[0052] [healthcheck] service [kube-proxy] on host [172.16.10.99] is healthy 
INFO[0052] [sidekick] Sidekick container already created on host [172.16.10.99] 
INFO[0052] [healthcheck] Start Healthcheck on service [kubelet] on host [172.16.10.99] 
INFO[0052] [healthcheck] service [kubelet] on host [172.16.10.99] is healthy 
INFO[0052] [healthcheck] Start Healthcheck on service [kube-proxy] on host [172.16.10.99] 
INFO[0052] [healthcheck] service [kube-proxy] on host [172.16.10.99] is healthy 
INFO[0052] [worker] Successfully started Worker Plane.. 
INFO[0052] [network] Setting up network plugin: flannel 
INFO[0052] [addons] Saving addon ConfigMap to Kubernetes 
INFO[0053] [addons] Successfully Saved addon to Kubernetes ConfigMap: rke-network-plugin 
INFO[0053] [addons] Executing deploy job..              
INFO[0058] [sync] Syncing nodes Labels and Taints       
INFO[0058] [sync] Successfully synced nodes Labels and Taints 
INFO[0058] [addons] Setting up KubeDNS                  
INFO[0058] [addons] Saving addon ConfigMap to Kubernetes 
INFO[0058] [addons] Successfully Saved addon to Kubernetes ConfigMap: rke-kubedns-addon 
INFO[0058] [addons] Executing deploy job..              
INFO[0063] [addons] KubeDNS deployed successfully..     
INFO[0063] [ingress] Setting up nginx ingress controller 
INFO[0063] [addons] Saving addon ConfigMap to Kubernetes 
INFO[0063] [addons] Successfully Saved addon to Kubernetes ConfigMap: rke-ingress-controller 
INFO[0063] [addons] Executing deploy job..              
INFO[0068] [ingress] ingress controller nginx is successfully deployed 
INFO[0068] [addons] Setting up user addons..            
INFO[0068] [addons] No user addons configured..         
INFO[0068] Finished building Kubernetes cluster successfully 

    如果执行过程出现错误,可以先执行remove,再执行up,如果还不行,先remove再重启机器,最后在up。一般都会成功,如果执行了如上步骤还不行,再看具体报错信息。

二、导入rke到rancher2.0(预览版)

    点击创建集群,在最右边有个导入现有集群。

    执行rke命令的目录下会自动生成一个kube_config_cluster.yml文件,点击页面的导入,把该文件导入。

    注意:rancher2.0,现在都是开发版,存在各种问题,仅适合调研用,缺少很多东西,不适合生产用。消息说三月底会推送2.0正式版。

三、附录

    rke安装注意事项:http://blog.csdn.net/csdn_duomaomao/article/details/79325759

    rancher导入rke:http://blog.csdn.net/csdn_duomaomao/article/details/79325436

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