Kubernetes 1.17.1快速升级

廉价感情. 提交于 2020-02-27 22:55:56

Kubernetes 1.17.1已经正式发布,快速升级(含国内镜像快速下载链接)包括升级kubeadm/kubectl/kubelet版本、拉取镜像、升级Kubernetes集群三个主要步骤。参考《Ubuntu上软件锁定版本不更新》安装特定DockerCE版本。

1、升级kubeadm/kubectl/kubelet版本

sudo apt install kubeadm=1.17.1-00 kubectl=1.17.1-00 kubelet=1.17.1-00

查看该版本的容器镜像版本:

kubeadm config images list

输出如下:

~# kubeadm config images list

k8s.gcr.io/kube-apiserver:v1.17.1
k8s.gcr.io/kube-controller-manager:v1.17.1
k8s.gcr.io/kube-scheduler:v1.17.1
k8s.gcr.io/kube-proxy:v1.17.1
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.4.3-0
k8s.gcr.io/coredns:1.6.5

2、拉取容器镜像

原始的kubernetes镜像文件在gcr上,不能直接下载。我给镜像到了阿里云的杭州机房的容器仓库里,拉取还是比较快的。

echo ""
echo "=========================================================="
echo "Pull Kubernetes v1.17.1 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:v1.17.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-controller-manager:v1.17.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-scheduler:v1.17.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-proxy:v1.17.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-etcd:3.4.3-0
docker pull ${MY_REGISTRY}/k8s-gcr-io-pause:3.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-coredns:1.6.5

## 添加Tag
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-apiserver:v1.17.1 k8s.gcr.io/kube-apiserver:v1.17.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-scheduler:v1.17.1 k8s.gcr.io/kube-scheduler:v1.17.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-controller-manager:v1.17.1 k8s.gcr.io/kube-controller-manager:v1.17.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-proxy:v1.17.1 k8s.gcr.io/kube-proxy:v1.17.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-etcd:3.4.3-0 k8s.gcr.io/etcd:3.4.3-0
docker tag ${MY_REGISTRY}/k8s-gcr-io-pause:3.1 k8s.gcr.io/pause:3.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-coredns:1.6.5 k8s.gcr.io/coredns:1.6.5

echo ""
echo "=========================================================="
echo "Pull Kubernetes v1.17.1 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,然后执行。

3、升级Kubernetes集群

全新安装:

#指定IP地址,1.17.1版本:
sudo kubeadm init --kubernetes-version=v1.17.1 --apiserver-advertise-address=10.1.1.199 --pod-network-cidr=10.244.0.0/16

先查看一下需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如下:

Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT   CURRENT       AVAILABLE
Kubelet     1 x v1.17.0   v1.17.1
            8 x v1.17.1   v1.17.1

Upgrade to the latest version in the v1.17 series:

COMPONENT            CURRENT   AVAILABLE
API Server           v1.17.0   v1.17.1
Controller Manager   v1.17.0   v1.17.1
Scheduler            v1.17.0   v1.17.1
Kube Proxy           v1.17.0   v1.17.1
CoreDNS              1.6.5     1.6.5
Etcd                 3.4.3     3.4.3-0

You can now apply the upgrade by executing the following command:

    kubeadm upgrade apply v1.17.1

确保上面的容器镜像已经下载(如果没有提前下载,可能被网络阻隔导致挂起),然后执行升级:

kubeadm upgrade -y apply v1.17.1

看到下面信息,就OK了。

[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.17.1". Enjoy!

然后,配置当前用户环境:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

就可以使用 kubectl version 来查看状态和 kubectl cluster-info 查看服务地址。

4、工作节点的升级

每个工作节点需要拉取上面对应版本的镜像,以及安装kubelet的对应版本。

检查版本:

~$ kubectl version

查看Pod信息:

kubectl get pod --all-namespaces

完成。

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