Kubernetes 1.12.1快速升级

Kubernetes 1.12.1快速升级，包括升级kubeadm/kubectl/kubelet版本、拉取镜像、升级Kubernetes集群三个主要步骤。

一、升级kubeadm/kubectl/kubelet版本

sudo apt install kubeadm=1.12.1-00 kubectl=1.12.1-00 kubelet=1.12.1-00

查看该版本的容器镜像版本：

kubeadm config images list

输出以下：

~# kubeadm config images list

k8s.gcr.io/kube-apiserver:v1.12.1
k8s.gcr.io/kube-controller-manager:v1.12.1
k8s.gcr.io/kube-scheduler:v1.12.1
k8s.gcr.io/kube-proxy:v1.12.1
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.2.24
k8s.gcr.io/coredns:1.2.2

二、拉取容器镜像

我给镜像到了阿里云的杭州机房的容器仓库里，拉取仍是比较快的。

echo ""
echo "=========================================================="
echo "Pull Kubernetes v1.12.1 Images from aliyuncs.com ......"
echo "=========================================================="
echo ""

MY_REGISTRY=registry.cn-hangzhou.aliyuncs.com/openthings

## 拉取镜像
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-apiserver:v1.12.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-controller-manager:v1.12.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-scheduler:v1.12.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-proxy:v1.12.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-etcd:3.2.24
docker pull ${MY_REGISTRY}/k8s-gcr-io-pause:3.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-coredns:1.2.2


## 添加Tag
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-apiserver:v1.12.1 k8s.gcr.io/kube-apiserver:v1.12.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-scheduler:v1.12.1 k8s.gcr.io/kube-scheduler:v1.12.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-controller-manager:v1.12.1 k8s.gcr.io/kube-controller-manager:v1.12.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-proxy:v1.12.1 k8s.gcr.io/kube-proxy:v1.12.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-etcd:3.2.24 k8s.gcr.io/etcd:3.2.24
docker tag ${MY_REGISTRY}/k8s-gcr-io-pause:3.1 k8s.gcr.io/pause:3.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-coredns:1.2.2 k8s.gcr.io/coredns:1.2.2

echo ""
echo "=========================================================="
echo "Pull Kubernetes v1.12.1 Images FINISHED."
echo "into registry.cn-hangzhou.aliyuncs.com/openthings, "
echo "           by openthings@https://my.oschina.net/u/2306127."
echo "=========================================================="

echo ""

保存为shell脚本，而后执行。

• 或者，下载脚本：https://github.com/openthings/kubernetes-tools/blob/master/kubeadm/2-images/

三、升级Kubernetes集群

先查看一下须要升级的各个组件的版本。

使用kubeadm upgrade plan ，输出的版本升级信息以下：

COMPONENT            CURRENT   AVAILABLE
API Server           v1.11.2   v1.12.1
Controller Manager   v1.11.2   v1.12.1
Scheduler            v1.11.2   v1.12.1
Kube Proxy           v1.11.2   v1.12.1
CoreDNS              1.1.3     1.2.2
Etcd                 3.2.18    3.2.24

确保上面的容器镜像已经下载（若是没有提早下载，可能被网络阻隔致使挂起），而后执行升级：

kubeadm upgrade apply v1.12.1

看到下面信息，就OK了。

[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.12.1". Enjoy!

四、工做节点的升级

每一个工做节点须要拉取上面对应版本的镜像，以及安装kubelet的对应版本。

Verify

~$ kubectl version

Client Version: version.Info{Major:"1", Minor:"12", GitVersion:"v1.12.1", GitCommit:"4ed3216f3ec431b140b1d899130a69fc671678f4", GitTreeState:"clean", BuildDate:"2018-10-05T16:46:06Z", GoVersion:"go1.10.4", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"12", GitVersion:"v1.12.1", GitCommit:"4ed3216f3ec431b140b1d899130a69fc671678f4", GitTreeState:"clean", BuildDate:"2018-10-05T16:36:14Z", GoVersion:"go1.10.4", Compiler:"gc", Platform:"linux/amd64"}

 

Get Pod

kubectl get pod --all-namespaces

view list.