解决kubeadm部署kubernetes集群镜像问题
kubeadm 是kubernetes 的集群安装工具，能够快速安装kubernetes 集群。kubeadm init 命令默认使用的docker镜像仓库为k8s.gcr.io，国内无法直接访问，需要中转一下才可以使用。
首先查看需要哪些镜像
kubeadm config images list[root@master ~]# kubeadm config images list
I1215 20:40:10.170825 2583 version.go:94] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://storage.googleapis.com/kubernetes-release/release/stable-1.txt: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
I1215 20:40:10.170992 2583 version.go:95] falling back to the local client version: v1.13.1
k8s.gcr.io/kube-apiserver:v1.13.1
k8s.gcr.io/kube-controller-manager:v1.13.1
k8s.gcr.io/kube-scheduler:v1.13.1
k8s.gcr.io/kube-proxy:v1.13.1
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.2.24
k8s.gcr.io/coredns:1.2.6通过 docker.io/mirrorgooglecontainers中转一下https://hub.docker.com/u/mirrorgooglecontainers
批量下载及转换标签
kubeadm config images list |sed -e 's/^/docker pull /g' -e 's#k8s.gcr.io#docker.io/mirrorgooglecontainers#g' |sh -x 下载需要的镜像
docker images |grep mirrorgooglecontainers |awk '{print "docker tag ",$1":"$2,$1":"$2}' |sed -e 's#mirrorgooglecontainers#k8s.gcr.io#2' |sh -x 重命名镜像
docker images |grep mirrorgooglecontainers |awk '{print "docker rmi ", $1":"$2}' |sh -x 删除mirrorgooglecontainers镜像coredns没包含在docker.io/mirrorgooglecontainers中，需要手工从coredns官方镜像转换下。
docker pull coredns/coredns:1.2.6
docker tag coredns/coredns:1.2.6 k8s.gcr.io/coredns:1.2.6
docker rmi coredns/coredns:1.2.6查看镜像列表
[root@master ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE k8s.gcr.io/kube-proxy v1.13.1 fdb321fd30a0 2 days ago 80.2MB k8s.gcr.io/kube-apiserver v1.13.1 40a63db91ef8 2 days ago 181MB k8s.gcr.io/kube-controller-manager v1.13.1 26e6f1db2a52 2 days ago 146MB k8s.gcr.io/kube-scheduler v1.13.1 ab81d7360408 2 days ago 79.6MB k8s.gcr.io/coredns 1.2.6 f59dcacceff4 5 weeks ago 40MB k8s.gcr.io/etcd 3.2.24 3cab8e1b9802 2 months ago 220MB k8s.gcr.io/pause 3.1 da86e6ba6ca1 11 months ago 742kB
另外一种方法是使用kubeadm配置文件，通过在配置文件中指定docker仓库地址，便于内网快速部署。
生成配置文件
kubeadm config print-defaults --api-objects ClusterConfiguration >kubeadm.conf将配置文件中的
imageRepository: k8s.gcr.io改为你自己的私有docker仓库，比如
imageRepository: docker.io/mirrorgooglecontainerskubeadm生成的配置文件目前不够完善，需要修改kubernetes版本
kubernetesVersion: v1.13.1改为
kubernetesVersion: v1.13.1然后运行命令
kubeadm config images list --config kubeadm.conf
kubeadm config images pull --config kubeadm.conf
kubeadm init --config kubeadm.conf更多kubeadm配置文件参数详见
kubeadm config print-defaults