前言
尝试安装helm3,kubernetes1.18,istio1.6是否支持现有集群平滑迁移
版本
Centos7.6 升级内核4.x
kubernetes:v1.18.5
helm:v3.2.4
istio:v1.6.4
安装
添加kubernetes源
cat /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-$basearch enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg exclude=kubelet kubeadm kubectl
查看历史版本有那些
查看历史版本有那些 #yum list --showduplicates kubeadm|grep 1.18 本地下载rpm包 #yum install kubectl-1.18.5-0.x86_64 kubeadm-1.18.5-0.x86_64 kubelet-1.18.5-0.x86_64 --downloadonly --downloaddir=./rpmKubeadm
查看kubernetes1.18需要的镜像列表
#kubeadm config images list --kubernetes-version=v1.18.5 W0709 15:55:40.303088 7778 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io] k8s.gcr.io/kube-apiserver:v1.18.5 k8s.gcr.io/kube-controller-manager:v1.18.5 k8s.gcr.io/kube-scheduler:v1.18.5 k8s.gcr.io/kube-proxy:v1.18.5 k8s.gcr.io/pause:3.2 k8s.gcr.io/etcd:3.4.3-0 k8s.gcr.io/coredns:1.6.7
下载镜像并导出
#使用脚本
#/bin/bash
url=k8s.gcr.io
version=v1.18.5
images=(`kubeadm config images list --kubernetes-version=$version|awk -F ‘/‘ ‘{print $2}‘`)
for imagename in ${images[@]} ; do
#echo $imagename
echo "docker pull $url/$imagename"
docker pull $url/$imagename
done
images=(`kubeadm config images list --kubernetes-version=$version`)
echo "docker save ${images[@]} -o kubeDockerImage$version.tar"
docker save ${images[@]} -o kubeDockerImage$version.tar
最终文件目录如下
[root@dev-k8s-master-1-105 v1-18]# tree ./
./
├── images.sh
├── kubeDockerImagev1.18.5.tar
└── rpmKubeadm
├── cri-tools-1.13.0-0.x86_64.rpm
├── kubeadm-1.18.5-0.x86_64.rpm
├── kubectl-1.18.5-0.x86_64.rpm
├── kubelet-1.18.5-0.x86_64.rpm
└── kubernetes-cni-0.8.6-0.x86_64.rpm
1 directory, 7 files
[root@dev-k8s-master-1-105 v1-18]#
安装rpm并导入镜像
yum install -y ./rpmKubeadm/*.rpm docker load -i kubeDockerImagev1.18.5.tar
初始化集群
kubeadm init --kubernetes-version=1.18.5 --apiserver-advertise-address=192.168.1.105 --pod-network-cidr=10.81.0.0/16
部分信息
Your Kubernetes control-plane has initialized successfully! To start using your cluster, you need to run the following as a regular user: mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ Then you can join any number of worker nodes by running the following on each as root: kubeadm join 192.168.1.105:6443 --token xnlao7.5qsgih5vft0n2li6 --discovery-token-ca-cert-hash sha256:1d341b955245da64a5e28791866e0580a5e223a20ffaefdc6b2729d9fb1739b4
安装网络
wget https://docs.projectcalico.org/v3.14/manifests/calico.yaml kuberctl apply -f calico.yaml
安装完成
[root@dev-k8s-master-1-105 v1-18]# kubectl get pods -n kube-system NAME READY STATUS RESTARTS AGE calico-kube-controllers-76d4774d89-kp8nz 1/1 Running 0 46h calico-node-k5m4b 1/1 Running 0 46h calico-node-l6hq7 1/1 Running 0 46h coredns-66bff467f8-hgbvw 1/1 Running 0 47h coredns-66bff467f8-npmxl 1/1 Running 0 47h etcd-dev-k8s-master-1-105 1/1 Running 0 47h kube-apiserver-dev-k8s-master-1-105 1/1 Running 0 47h kube-controller-manager-dev-k8s-master-1-105 1/1 Running 0 47h kube-proxy-6dx95 1/1 Running 0 46h kube-proxy-926mq 1/1 Running 0 47h kube-scheduler-dev-k8s-master-1-105 1/1 Running 0 47h [root@dev-k8s-master-1-105 v1-18]#
安装helm3
主要变化：release不在是全局的，要指定release名称，没有tiller
安装
wget https://get.helm.sh/helm-v3.2.4-linux-amd64.tar.gz cp helm /usr/local/bin/ 初始化可以使用helm init 添加公共仓库 helm repo add stable https://kubernetes-charts.storage.googleapis.com 查看 helm repo list 搜索 helm search repo nginx
查看版本信息
[root@dev-k8s-master-1-105 ~]# which helm
/usr/local/bin/helm
[root@dev-k8s-master-1-105 ~]# helm version
version.BuildInfo{Version:"v3.2.4", GitCommit:"0ad800ef43d3b826f31a5ad8dfbb4fe05d143688", GitTreeState:"clean", GoVersion:"go1.13.12"}
[root@dev-k8s-master-1-105 ~]#
查看配置信息
[root@dev-k8s-master-1-105 ~]# helm env HELM_BIN="helm" HELM_DEBUG="false" HELM_KUBEAPISERVER="" HELM_KUBECONTEXT="" HELM_KUBETOKEN="" HELM_NAMESPACE="default" HELM_PLUGINS="/root/.local/share/helm/plugins" HELM_REGISTRY_CONFIG="/root/.config/helm/registry.json" HELM_REPOSITORY_CACHE="/root/.cache/helm/repository" HELM_REPOSITORY_CONFIG="/root/.config/helm/repositories.yaml" [root@dev-k8s-master-1-105 ~]#
指定k8s集群
v3版本不再需要Tiller，而是通过ApiServer与k8s交互，可以设置环境变量KUBECONFIG来指定存有ApiServre的地址与token的配置文件地址，默认为~/.kube/config
export KUBECONFIG=/root/.kube/config #可以写到/etc/profile里
安装gitlab插件
[root@dev-k8s-master-1-105 ~]# helm plugin install https://github.com/diwakar-s-maurya/helm-git [root@dev-k8s-master-1-105 ~]# helm plugin ls NAME VERSION DESCRIPTION helm-git 1.0.0 Let‘s you use private gitlab repositories easily [root@dev-k8s-master-1-105 ~]# 添加gitlab仓库地址
helm repo add myhelmrepo gitlab://username/project:master/kubernetes/helm-chart helm repo list
使用istioctl安装istio1.6.4
下载
wget https://github.com/istio/istio/releases/download/1.6.4/istioctl-1.6.4-linux-amd64.tar.gz cp istioctl /usr/local/bin/
默认安装