Kubernetes 1.12.1快速升級

Kubernetes 1.12.1快速升級，包括升級kubeadm/kubectl/kubelet版本、拉取鏡像、升級Kubernetes集羣三個主要步驟。

一、升級kubeadm/kubectl/kubelet版本

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

查看該版本的容器鏡像版本：

kubeadm config images list

輸出以下：

~# 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、拉取容器鏡像

我給鏡像到了阿里雲的杭州機房的容器倉庫裏，拉取仍是比較快的。

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

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

## 拉取鏡像
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 ""

保存爲shell腳本，而後執行。

• 或者，下載腳本：https://github.com/openthings/kubernetes-tools/blob/master/kubeadm/2-images/

三、升級Kubernetes集羣

先查看一下須要升級的各個組件的版本。

使用kubeadm upgrade plan ，輸出的版本升級信息以下：

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

確保上面的容器鏡像已經下載（若是沒有提早下載，可能被網絡阻隔致使掛起），而後執行升級：

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、工做節點的升級

每一個工做節點須要拉取上面對應版本的鏡像，以及安裝kubelet的對應版本。

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.