kubadm方式安裝k8s時的images安裝和init操做

    使用kubeadm安裝k8s時，有一步驟時下載images操做，通常度不少使用的方法是：使用docker images下載鏡像再次tag鏡像的名稱，而後初始化的時候在配置集羣子ip信息等

以下：

        1.設置kubelet國內的pause鏡像
        cat >/etc/sysconfig/kubelet<<EOF
        KUBELET_EXTRA_ARGS="--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
        EOF
        
        2.Kubeadm初始化
        # 初始化時報錯提示沒有鏡像文件，須要先下載在初始化(下面腳本只適用1.15.3版本)
        name=(kube-apiserver:v1.15.3空格kube-controller-manager:v1.15.3空格kube-scheduler:v1.15.3空格kube-proxy:v1.15.3空格pause:3.1空格etcd:3.3.10 coredns:1.3.1)
        # 修改鏡像的名稱
        for info in ${name[@]}
        do
        docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$info
        docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$info   k8s.gcr.io/$info
        docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/$info
        Done
        
        #初始化master 
        #kubectl --version#查看版本
        #kubeadm init --kubernetes-version=v1.15.3 --pod-network-cidr=10.1.0.0/16 #--apiserver-advertise-address=192.168.191.11 --ignore-preflight-errors=Swap

   在此給你們介紹一個簡單的方法

        #在得到vip的master節點上生成創始化配置文件 

        kubeadm config print init-defaults > kubeadm-init.yaml  #必須是yaml格式的文件

            apiVersion: kubeadm.k8s.io/v1beta2
            bootstrapTokens:
            - groups:
              - system:bootstrappers:kubeadm:default-node-token
              token: abcdef.0123456789abcdef
              ttl: 24h0m0s
              usages:
              - signing
              - authentication
            kind: InitConfiguration
            localAPIEndpoint:
              advertiseAddress: 192.168.191.30     #本機ip
              bindPort: 6443
            nodeRegistration:
              criSocket: /var/run/dockershim.sock
              name: k8s-3
              taints:
              - effect: NoSchedule
                key: node-role.kubernetes.io/master
            ---
            apiServer:
              timeoutForControlPlane: 4m0s
            apiVersion: kubeadm.k8s.io/v1beta2
            certificatesDir: /etc/kubernetes/pki
            clusterName: kubernetes
            controlPlaneENDPOINT: "192.168.191.30:58443"      #此項如沒有請自行添加，此處請填寫你的高可用的VIP地址及端口
            controllerManager: {}
            dns:
              type: CoreDNS
            etcd:
              local:
                dataDir: /var/lib/etcd
            imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers   #國內阿里的k8s鏡像元
            kind: ClusterConfiguration
            kubernetesVersion: v1.17.4                            # 鏡像的版本
            networking:
              dnsDomain: cluster.local
              podSubnet: 10.244.0.0/16                          # pod的網段，沒有該設置，須要添加
              serviceSubnet: 10.96.0.0/12
            scheduler: {}
            ---  
            #使用ipvs  ，須要本身安裝ipvsadm
            apiVersion: kubeproxy.config.k8s.io/v1alpha1
            kind: KubeProxyConfiguration
            featureGates:
              SupportIPVSProxyMode: true
            mode: ipvs

        #查看須要的鏡像   

[root@k8s-3 ~]# kubeadm config images list 
W0323 17:27:46.000689   63185 validation.go:28] Cannot validate kube-proxy config - no validator is available   # 忽略
W0323 17:27:46.001023   63185 validation.go:28] Cannot validate kubelet config - no validator is available
k8s.gcr.io/kube-apiserver:v1.17.4
k8s.gcr.io/kube-controller-manager:v1.17.4
k8s.gcr.io/kube-scheduler:v1.17.4
k8s.gcr.io/kube-proxy:v1.17.4
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.4.3-0
k8s.gcr.io/coredns:1.6.5

        #拉取須要的鏡像

        kubeadm config images pull --config kubeadm-init.yaml

        #初始化

        kubeadm init  --config kubeadm-init.yaml