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「notes」k8s学习笔记

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  • 查看docker的进程状态

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    systemctl status docker

  • 安装kubeadm、kubelet和kubectl等工具的命令和步骤：

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    curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -
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    cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
    deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
    EOF

    执行更新，并且安装

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    apt-get update
    apt-get install -y kubeadm=1.14.1-00 kubectl=1.14.1-00 kubelet=1.14.1-00

  • 从k8s的mirror镜像库下载k8s master组件和node组件镜像步骤:

    • 查看核心组件版本
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    kubeadm config images list
    • Kuiki的方法
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    # master节点
    # 先将难以拉去的镜像通过阿里源拉下来
    sudo -i # 切root方便操作docker
    for  i  in  `kubeadm config images list`;  do
        imageName=${i#k8s.gcr.io/}
        docker pull registry.aliyuncs.com/google_containers/$imageName
        docker tag registry.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
        docker rmi registry.aliyuncs.com/google_containers/$imageName
    done;
    exit # 退出root
    • master节点
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    docker pull anjia0532/kube-apiserver-amd64:v1.10.2
    docker pull anjia0532/kube-controller-manager-amd64:v1.10.2
    docker pull anjia0532/kube-scheduler-amd64:v1.10.2
    docker pull anjia0532/kube-proxy-amd64:v1.10.2
    docker pull anjia0532/etcd-amd64:3.1.12
    docker pull anjia0532/pause-amd64:3.1
    docker pull anjia0532/k8s-dns-sidecar-amd64:1.14.8
    docker pull anjia0532/k8s-dns-kube-dns-amd64:1.14.8
    docker pull anjia0532/k8s-dns-dnsmasq-nanny-amd64:1.14.8

    docker tag anjia0532/kube-apiserver-amd64:v1.10.2 k8s.gcr.io/kube-apiserver-amd64:v1.10.2
    docker tag anjia0532/kube-scheduler-amd64:v1.10.2 k8s.gcr.io/kube-scheduler-amd64:v1.10.2
    docker tag anjia0532/kube-controller-manager-amd64:v1.10.2 k8s.gcr.io/kube-controller-manager-amd64:v1.10.2
    docker tag anjia0532/kube-proxy-amd64:v1.10.2 k8s.gcr.io/kube-proxy-amd64:v1.10.2
    docker tag anjia0532/etcd-amd64:3.1.12 k8s.gcr.io/etcd-amd64:3.1.12
    docker tag anjia0532/pause-amd64:3.1 k8s.gcr.io/pause-amd64:3.1
    docker tag anjia0532/k8s-dns-sidecar-amd64:1.14.8 k8s.gcr.io/k8s-dns-sidecar-amd64:1.14.8
    docker tag anjia0532/k8s-dns-kube-dns-amd64:1.14.8 k8s.gcr.io/k8s-dns-kube-dns-amd64:1.14.8
    docker tag anjia0532/k8s-dns-dnsmasq-nanny-amd64:1.14.8 k8s.gcr.io/k8s-dns-dnsmasq-nanny-amd64:1.14.8

  • worker节点

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    docker pull anjia0532/pause-amd64:3.1
    docker pull anjia0532/kube-proxy-amd64:v1.10.2

    docker tag anjia0532/pause-amd64:3.1 k8s.gcr.io/pause-amd64:3.1
    docker tag anjia0532/kube-proxy-amd64:v1.10.2 k8s.gcr.io/kube-proxy-amd64:v1.10.2

    查看可供安装的kubeadm的版本

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    apt-cache madison kubeadm

  • 初始化kubeadm（master节点）

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    kubeadm init --apiserver-advertise-address=172.18.94.63 --pod-network-cidr=10.244.0.0/16 --kubernetes-version=1.14.1

  • 从节点加入主节点

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    kubeadm join 10.0.2.15:6443 --token 8t3pie.0n7ra7idaqzl7i1j --discovery-token-ca-cert-hash sha256:00dd3ee3f9c2592bb4ce15dce533f3cae193f30a457c5c2deffd30b548f46b0a

  • 初始化配置

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    kubeadm reset

  • The connection to the server localhost:8080 was refused - did you specify the right host or port?

    原因：kubenetes master没有与本机绑定，集群初始化的时候没有设置
    解决办法：执行以下命令

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    export KUBECONFIG=/etc/kubernetes/admin.conf

    /etc/kubernetes/admin.conf这个文件主要是集群初始化的时候用来传递参数的

  • 检查功能

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    kubectl get pods -n kube-system -o wide

  • 安装weave

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      kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
    2. 方法2: （应对weave pod启动时出现：Network 10.32.0.0/12 overlaps with existing route xx.xx.xx.xx/16 on host 错误信息) 
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      curl -L "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')" > weave.yaml
      在weave容器，修改：IPALLOC_RANGE 
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      vim weave.yaml

      - name: IPALLOC_RANGE
        value: 192.168.16.0/20
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      kubectl apply -f weave.yaml

  • 安装dashboard的步骤：

    1. 下载dashboard镜像

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      docker pull anjia0532/kubernetes-dashboard-amd64:v1.8.3
      docker tag  anjia0532/kubernetes-dashboard-amd64:v1.8.3 k8s.gcr.io/kubernetes-dashboard-amd64:v1.8.3

    2. 安装dashboard

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      kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta1/aio/deploy/recommended.yaml

      Dashboard 可以参考这个网址https://www.kubernetes.org.cn/5462.html

      另外，1.7章，6:30 教怎么样创建dashboard的用户

  • 其他

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    # 在kubeadm init后此时root用户还不能使用kubelet控制集群，还需要配置该环境变量。
    echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

    # 立即生效
    source ~/.bash_profile

    kubectl get pods -n kube-system -o wide
    echo xxxx|base64 -d

    # 编辑kubelet的参数配置
    vim /var/lib/kubelet/config.yaml

    # 修改后重启生效
    systemctl daemon-reload
    systemctl restart kubelet

    # 查看运行状态
    service kubelet status