K8S 升級V1.14.0

1、查看該版本的容器鏡像版本：

kubeadm config images list
輸出如下：

~# kubeadm config images list
k8s.gcr.io/kube-apiserver:v1.14.0
k8s.gcr.io/kube-controller-manager:v1.14.0
k8s.gcr.io/kube-scheduler:v1.14.0
k8s.gcr.io/kube-proxy:v1.14.0
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.3.10
k8s.gcr.io/coredns:1.3.1 

2、拉取容器鏡像

原始的kubernetes鏡像文件在gcr上，不能直接下載。下面是阿里云上的資源，所有主機上都執行一下（master和node上都執行該腳本）。

echo ""
echo "=========================================================="
echo "Pull Kubernetes v1.14.0 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:v1.14.0
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-controller-manager:v1.14.0
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-scheduler:v1.14.0
docker pull ${MY_REGISTRY}/k8s-gcr-io-kube-proxy:v1.14.0
docker pull ${MY_REGISTRY}/k8s-gcr-io-etcd:3.3.10
docker pull ${MY_REGISTRY}/k8s-gcr-io-pause:3.1
docker pull ${MY_REGISTRY}/k8s-gcr-io-coredns:1.3.1

## 添加Tag
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-apiserver:v1.14.0 k8s.gcr.io/kube-apiserver:v1.14.0
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-scheduler:v1.14.0 k8s.gcr.io/kube-scheduler:v1.14.0
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-controller-manager:v1.14.0 k8s.gcr.io/kube-controller-manager:v1.14.0
docker tag ${MY_REGISTRY}/k8s-gcr-io-kube-proxy:v1.14.0 k8s.gcr.io/kube-proxy:v1.14.0
docker tag ${MY_REGISTRY}/k8s-gcr-io-etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
docker tag ${MY_REGISTRY}/k8s-gcr-io-pause:3.1 k8s.gcr.io/pause:3.1
docker tag ${MY_REGISTRY}/k8s-gcr-io-coredns:1.3.1 k8s.gcr.io/coredns:1.3.1

docker rmi ${MY_REGISTRY}/k8s-gcr-io-kube-apiserver:v1.14.0
docker rmi ${MY_REGISTRY}/k8s-gcr-io-kube-controller-manager:v1.14.0
docker rmi ${MY_REGISTRY}/k8s-gcr-io-kube-scheduler:v1.14.0
docker rmi ${MY_REGISTRY}/k8s-gcr-io-kube-proxy:v1.14.0
docker rmi ${MY_REGISTRY}/k8s-gcr-io-etcd:3.3.10
docker rmi ${MY_REGISTRY}/k8s-gcr-io-pause:3.1
docker rmi ${MY_REGISTRY}/k8s-gcr-io-coredns:1.3.1

echo ""
echo "=========================================================="
echo "Pull Kubernetes v1.14.0 Images FINISHED."
echo "into registry.cn-hangzhou.aliyuncs.com/openthings, "
echo "=========================================================="
echo ""

保存為shell腳本，然后執行。

3、升級Kubernetes集群

先查看一下需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如下：

COMPONENT            CURRENT   AVAILABLE
API Server           v1.13.4   v1.14.0
Controller Manager   v1.13.4   v1.14.0
Scheduler            v1.13.4   v1.14.0
Kube Proxy           v1.13.4   v1.14.0
CoreDNS              1.2.6     1.3.1
Etcd                 3.2.24    3.3.10

確保上面的容器鏡像已經下載（如果沒有提前下載，可能被網絡阻隔導致掛起），然后在master上執行升級（我使用的是1個master，2個node的模式。如果是多個master需要在所有master上執行）：
kubeadm upgrade -y apply v1.14.0
看到下面信息，就OK了。
[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.14.0". Enjoy!