P. 準(zhǔn)備工作

[kiosk@k8s-master | k8s-worker1 | k8s-worker2]$

1. 設(shè)置當(dāng)前用戶sudo免密 [選做]

   不想每次都輸入密碼 - 加速

   # 當(dāng)前用戶的密碼
   OS_PASS=ubuntu
   
   # 緩存 sudo 密碼 ubuntu
   echo $OS_PASS | sudo -v -S 
   
   # 永久生效
   sudo tee /etc/sudoers.d/$USER >/dev/null <<EOF
   $USER ALL=(ALL) NOPASSWD: ALL
   EOF
   
   cat /etc/sudoers.d/$USER
   

2. 使用國內(nèi)鏡像倉庫 [選做]

   軟件安裝 - 加速

   if ! curl --connect-timeout 2 google.com &>/dev/null; then
       # C. 國內(nèi)
       MIRROR_URL=http://mirror.nju.edu.cn/ubuntu
       CODE_NAME=$(lsb_release -cs)
       COMPONENT="main restricted universe multiverse"
   
       # 生成軟件倉庫源
       sudo tee /etc/apt/sources.list >/dev/null <<EOF
   deb $MIRROR_URL $CODE_NAME $COMPONENT
   deb $MIRROR_URL $CODE_NAME-updates $COMPONENT
   deb $MIRROR_URL $CODE_NAME-backports $COMPONENT
   deb $MIRROR_URL $CODE_NAME-security $COMPONENT
   EOF
   fi
   
   cat /etc/apt/sources.list
   

3. 安裝相關(guān)軟件 <必做>

   # Which services should be restarted
   NFILE=/etc/needrestart/needrestart.conf
   
   sudo sed -i \
       -e '/nrconf{restart}/{s+i+a+;s+#++}'  \
       $NFILE
   
   grep nrconf{restart} $NFILE
   
   # 手動(dòng)更新
   sudo apt -y update
   
   ## 安裝
   # -  遠(yuǎn)程, ssh 免交互, 編輯文件, storageClass
   # -  Tab 自動(dòng)補(bǔ)全, nc, ping
   sudo apt -y install \
       openssh-server sshpass vim nfs-common \
       bash-completion netcat-openbsd iputils-ping
   

4. 設(shè)置靜態(tài) IP <必做>

   # 獲取 IP
   NICP=$(ip a | awk '/inet / {print $2}' | grep -v ^127)
   
   if [ "$(echo $NICP | wc -w)" != "1" ]; then
       select IP1 in $NICP; do
           break
       done
   else
       IP1=$NICP
   fi
   
   echo -e " addresses: \e[1;34m${IP1}\e[0;0m"
   
   # 獲取網(wǎng)卡名
   NICN=$(ip a | awk '/^2:/ {print $2}' | sed 's/://')
   
   echo -e " ethernets: \e[1;34m${NICN}\e[0;0m"
   
   # 獲取網(wǎng)關(guān)
   NICG=$(ip route | awk '/^default/ {print $3}')
   
   echo -e " routes: \e[1;34m${NICG}\e[0;0m"
   
   # 獲取 DNS
   unset DNS; unset DN
   for i in 114.114.114.114 8.8.4.4 8.8.8.8; do
       if nc -w 2 -zn $i 53 &>/dev/null; then
           DNS1=$i
           DNS="$DNS, $DNS1"
       fi
   done
   
   echo -e " nameservers: \e[1;34m${DNS#, }\e[0;0m"
   
   # 更新網(wǎng)卡配置文件
   NYML=/etc/netplan/00-installer-config.yaml
   
   sudo tee $NYML >/dev/null <<EOF
   network:
     ethernets:
       $NICN:
         dhcp4: false
         addresses: [$IP1]
         routes: 
         - to: default
           via: $NICG
         nameservers:
           addresses: [${DNS#, }]
     version: 2
   EOF
   
   cat $NYML
   
   # dns 解析文件鏈接
   sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf
   
   # active
   sudo netplan apply
   

5. 編輯 hosts <必做>

   # 顯示 ip 地址和主機(jī)名思劳，方便復(fù)制
   echo $(hostname -I) $(hostname)
   

   sudo tee -a /etc/hosts >/dev/null <<EOF
   # K8s-cluster
   192.168.147.128 k8s-master
   192.168.147.129 k8s-worker1
   192.168.147.130 k8s-worker2
   EOF
   
   cat /etc/hosts
   

6. 設(shè)置 root 密碼 [選做]

   ROOT_PASS=ubuntu
   
   (echo $ROOT_PASS; echo $ROOT_PASS) \
       | sudo passwd root
   
   echo PermitRootLogin yes \
       | sudo tee -a /etc/ssh/sshd_config
   
   sudo systemctl restart sshd
   

7. ssh 免密 [選做]

   # 生成 keypair
   ssh-keygen -f ~/.ssh/id_rsa -N ''
   
   # 拷貝公鑰
   ROOT_PASS=ubuntu
   
   NODES=$(egrep -v '^[a-f]|^:|^#|^$|^127' /etc/hosts | awk '{print $2}')
   
   echo -e "NODES: \e[1;34m$(echo $NODES)\e[0;0m"
   
   for i in $NODES; do
       for j in kiosk root; do
           sshpass -p$ROOT_PASS \
               ssh-copy-id -o StrictHostKeyChecking=no \
                   $j@$i
       done
   done
   

8. 禁用 swap <必做>

   # 交換文件
   SWAPF=$(awk '/swap/ {print $1}' /etc/fstab)
   
   # 立即禁用
   sudo swapoff $SWAPF
   
   # 永久禁用
   sudo sed -i '/swap/d' /etc/fstab
   
   # 刪除交換文件
   sudo rm $SWAPF
   
   # 確認(rèn)
   free -h
   

9. 擴(kuò)容 <必做>

   df -h / | egrep [0-9]+G
   
   # 邏輯卷名
   LVN=$(sudo lvdisplay | awk '/Path/ {print $3}')
   
   echo -e " LV Name: \e[1;34m${LVN}\e[0;0m"
   
   # 擴(kuò)容
   sudo lvextend -r -l 100%PVS $LVN \
     > /dev/null
   
   df -h / | egrep [0-9]+G
   

10. 模塊支持 <必做>

    ## 安裝
    sudo apt -y install bridge-utils
    
    # 永久生效
    MFILE=/etc/modules-load.d/br.conf
    
    sudo tee $MFILE >/dev/null <<EOF
    br_netfilter
    EOF
    
    cat $MFILE
    
    # 立即生效
    sudo modprobe br_netfilter
    
    lsmod | grep br
    
    ## 內(nèi)核支持
    sudo tee /etc/sysctl.d/k8s.conf >/dev/null <<EOF
    net.ipv4.ip_forward=1
    vm.swappiness=0
    vm.overcommit_memory=1
    vm.panic_on_oom=0
    EOF
    
    # 立即生效
    sudo sysctl -p /etc/sysctl.d/k8s.conf
    
    sudo sysctl -a | grep 'ip_forward '
    

11. 安裝運(yùn)行時(shí) <必做>

    ## 創(chuàng)建鏡像倉庫文件
    AFILE=/etc/apt/sources.list.d/docker.list
    
    if ! curl --connect-timeout 2 google.com &>/dev/null; then
        # C. 國內(nèi)
        AURL=https://mirror.nju.edu.cn/docker-ce
    else
        # A. 國外
        AURL=https://download.docker.com
    fi
    
    sudo tee $AFILE >/dev/null <<EOF
    deb $AURL/linux/ubuntu $(lsb_release -cs) stable
    EOF
    
    cat $AFILE
    
    # 導(dǎo)入公鑰
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg \
        | sudo apt-key add -
    
    # W: Key is stored in legacy trusted.gpg keyring
    sudo cp /etc/apt/trusted.gpg /etc/apt/trusted.gpg.d
    
    # 更新索引
    sudo apt-get update
    
    # 安裝 containerd
    sudo apt-get install containerd.io
    
    # 生成默認(rèn)配置文件
    containerd config default \
        | sudo tee /etc/containerd/config.toml >/dev/null
    
    ## 修改配置文件
    #   "alpine"
    #   376ms  https://docker.nju.edu.cn
    #   623ms  http://hub-mirror.c.163.com 
    #   10.97s https://docker.mirrors.ustc.edu.cn
    sudo sed -i \
        -e '/SystemdCgroup/s+false+true+' \
        /etc/containerd/config.toml
    
    if ! curl --connect-timeout 2 google.com &>/dev/null; then
        # C. 國內(nèi)
        REISTRY_OLD=registry.k8s.io
        REGISTRY_NEW=registry.aliyuncs.com/google_containers
        M1='[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]'
        M2='endpoint = ["https://docker.nju.edu.cn"]'
      
        sudo sed -i \
            -e "/sandbox_image/s+$REISTRY_OLD+$REGISTRY_NEW+" \
            -e "/registry.mirrors/a\        $M1" \
            -e "/registry.mirrors/a\          $M2" \
            /etc/containerd/config.toml 
    fi
    
    # 服務(wù)重啟
    sudo systemctl restart containerd
    

    ## 下載 crictl 壓縮包
    if ! curl --connect-timeout 2 google.com &>/dev/null; then
        # C. 國內(nèi)
        CURL=http://k8s.ruitong.cn:8080/K8s
    else
        # A. 國外
        CURL=https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.28.0
    fi
    
    TFILE=crictl-v1.28.0-linux-amd64.tar.gz
    
    curl -# -o $TFILE $CURL/$TFILE
    
    # 解壓 crictl
    tar -xf $TFILE
    
    # 安裝 crictl 命令
    sudo cp crictl /usr/bin/
    
    # 創(chuàng)建 crictl 配置文件
    sudo tee /etc/crictl.yaml <<EOF >/dev/null
    runtime-endpoint: unix:///run/containerd/containerd.sock
    image-endpoint: unix:///run/containerd/containerd.sock
    timeout: 10
    debug: false
    pull-image-on-create: true
    EOF
    
    sudo usermod -aG root $USER
    
    

K. 安裝 K8s

[kiosk@k8s-master | k8s-worker1 | k8s-worker2]$

12. 安裝 kubeadm晦炊、kubelet 和 kubectl

    # 更新 apt 包索引并安裝使用 Kubernetes apt 倉庫所需要的包
    sudo apt -y install apt-transport-https ca-certificates curl
    
    ## 添加 Kubernetes apt 倉庫
    sudo mkdir /etc/apt/keyrings &>/dev/null
    
    KFILE=/etc/apt/keyrings/kubernetes-archive-keyring.gpg
    
    if ! curl --connect-timeout 2 google.com &>/dev/null; then
        # C. 國內(nèi)
        KURL=http://k8s.ruitong.cn:8080/K8s
        AURL=https://mirror.nju.edu.cn/kubernetes/apt
    else
        # A. 國外
        KURL=https://packages.cloud.google.com
        AURL=https://apt.kubernetes.io/
    fi
    
    sudo curl -fsSLo $KFILE $KURL/apt/doc/apt-key.gpg
    
    sudo tee /etc/apt/sources.list.d/kubernetes.list <<EOF >/dev/null
    deb [signed-by=$KFILE] $AURL kubernetes-xenial main
    EOF
    
    sudo apt -y update
    

    • CKA鸣戴，CKS

    # 官方考試版本-CKA
    CKx_URL=https://training.linuxfoundation.cn/certificates/1
    
    :<<EOF
    # 官方考試版本-CKS
    CKx_URL=https://training.linuxfoundation.cn/certificates/16
    EOF
    
    KV=$(curl -s $CKx_URL | grep -Eo 軟件版本.*v[0-9].[0-9]+ | awk '{print $NF}')
    
    echo -e " The exam is based on Kubernetes: \e[1;34m${KV#v}\e[0;0m"
    
    # 列出所有小版本
    sudo apt-cache madison kubelet | grep ${KV#v}
    
    # 安裝 kubelet筐带、kubeadm 和 kubectl 考試版本
    sudo apt -y install \
        kubelet=${KV#v}.1-00 \
        kubeadm=${KV#v}.1-00 \
        kubectl=${KV#v}.1-00
    

    • CKAD

    # 官方考試版本 - CKAD
    CKx_URL=https://training.linuxfoundation.cn/certificates/4
    
    KV=$(curl -s $CKx_URL | grep -Eo 軟件版本.*v[0-9].[0-9]+ | awk '{print $NF}')
    
    echo -e " The exam is based on Kubernetes: \e[1;34m${KV#v}\e[0;0m"
    
    # 列出所有小版本
    sudo apt-cache madison kubelet | grep ${KV#v}
    
    # 安裝 kubelet、kubeadm 和 kubectl 考試版本
    sudo apt -y install \
        kubelet=${KV#v}.1-00 \
        kubeadm=${KV#v}.1-00 \
        kubectl=${KV#v}.1-00
    

    # 鎖定版本
    sudo apt-mark hold kubelet kubeadm kubectl
    

[kiosk@k8s-master]$

13. 初始化

    # 生成初始文件
    sudo kubeadm config print init-defaults \
        > kubeadm-config.yaml
    
    # IP 地址
    NICP=$(ip a | awk '/inet / {print $2}' | grep -v ^127 | sed 's+/.*++')
    
    if [ "$(echo $NICP | wc -w)" != "1" ]; then
        select IP1 in $NICP; do
            break
        done
    else
        IP1=$NICP
    fi
    
    echo -e " advertiseAddress: \e[1;34m${IP1}\e[0;0m"
    

    # kubeadm-config.yaml
    sudo sed -i \
        -e "/advertiseAddress/s+:.*+: $IP1+" \
        -e "/name/s+:.*+: $(hostname -s)+" \
        -e "/clusterName/s+:.*+: ck8s+" \
        kubeadm-config.yaml
    
    # 手動(dòng)拉取鏡像 [必選]
    # kubeadm init 時(shí)，會(huì)自動(dòng)拉取
    if ! curl --connect-timeout 2 google.com &>/dev/null; then
        # C. 國內(nèi)
        RURL=registry.aliyuncs.com/google_containers
        
        sudo kubeadm config images pull \
            --image-repository $RURL \
            --kubernetes-version ${KV#v}.1
        
        sudo sed -i \
            -e "/imageRepository/s+:.*+: $RURL+" \
            kubeadm-config.yaml
    fi
    
    # 驗(yàn)證+k8s
    sudo crictl images
    # 驗(yàn)證-k8s
    sudo ctr -n k8s.io image ls
    
    

    # 使用初始文件，初始化集群
    sudo kubeadm init \
        --config kubeadm-config.yaml
    

    [init] Using Kubernetes version: v1.27.0
    [preflight] Running pre-flight checks
    [preflight] Pulling images required for setting up a Kubernetes cluster
    [preflight] This might take a minute or two, depending on the speed of your internet connection
    [preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
    W0612 04:18:15.295414 10552 images.go:80] could not find officially supported version of etcd for Kubernetes v1.27.0, falling back to the nearest etcd version (3.5.7-0)
    W0612 04:18:30.785239 10552 checks.go:835] detected that the sandbox image "registry.aliyuncs.com/google_containers/pause:3.6" of the container runtime is inconsistent with that used by kubeadm. It is recommended that using "registry.aliyuncs.com/google_containers/pause:3.9" as the CRI sandbox image.
    [certs] Using certificateDir folder "/etc/kubernetes/pki"
    [certs] Generating "ca" certificate and key
    [certs] Generating "apiserver" certificate and key
    [certs] apiserver serving cert is signed for DNS names [k8s-master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.147.128]
    [certs] Generating "apiserver-kubelet-client" certificate and key
    [certs] Generating "front-proxy-ca" certificate and key
    [certs] Generating "front-proxy-client" certificate and key
    [certs] Generating "etcd/ca" certificate and key
    [certs] Generating "etcd/server" certificate and key
    [certs] etcd/server serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.147.128 127.0.0.1 ::1]
    [certs] Generating "etcd/peer" certificate and key
    [certs] etcd/peer serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.147.128 127.0.0.1 ::1]
    [certs] Generating "etcd/healthcheck-client" certificate and key
    [certs] Generating "apiserver-etcd-client" certificate and key
    [certs] Generating "sa" key and public key
    [kubeconfig] Using kubeconfig folder "/etc/kubernetes"
    [kubeconfig] Writing "admin.conf" kubeconfig file
    [kubeconfig] Writing "kubelet.conf" kubeconfig file
    [kubeconfig] Writing "controller-manager.conf" kubeconfig file
    [kubeconfig] Writing "scheduler.conf" kubeconfig file
    [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
    [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
    [kubelet-start] Starting the kubelet
    [control-plane] Using manifest folder "/etc/kubernetes/manifests"
    [control-plane] Creating static Pod manifest for "kube-apiserver"
    [control-plane] Creating static Pod manifest for "kube-controller-manager"
    [control-plane] Creating static Pod manifest for "kube-scheduler"
    [etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
    W0612 04:18:33.894812 10552 images.go:80] could not find officially supported version of etcd for Kubernetes v1.27.0, falling back to the nearest etcd version (3.5.7-0)
    [wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
    [apiclient] All control plane components are healthy after 6.502471 seconds
    [upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
    [kubelet] Creating a ConfigMap "kubelet-config" in namespace kube-system with the configuration for the kubelets in the cluster
    [upload-certs] Skipping phase. Please see --upload-certs
    [mark-control-plane] Marking the node k8s-master as control-plane by adding the labels: [node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
    [mark-control-plane] Marking the node k8s-master as control-plane by adding the taints [node-role.kubernetes.io/control-plane:NoSchedule]
    [bootstrap-token] Using token: abcdef.0123456789abcdef
    [bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
    [bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to get nodes
    [bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
    [bootstrap-token] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
    [bootstrap-token] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
    [bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
    [kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
    [addons] Applied essential addon: CoreDNS
    [addons] Applied essential addon: kube-proxy

    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
    

    Alternatively, if you are the root user, you can run:

    export KUBECONFIG=/etc/kubernetes/admin.conf
    

    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 192.168.147.128:6443 --token abcdef.0123456789abcdef \
      --discovery-token-ca-cert-hash sha256:49ff7a97c017153baee67c8f44fa84155b8cf06ca8cee067f766ec252cb8d1ac
    

14. 配置文件 - Client

    參考 init 的輸出提示

    # 創(chuàng)建目錄
    mkdir -p ~/.kube
    
    # user 復(fù)制配置文件
    sudo \cp /etc/kubernetes/admin.conf \
        ~/.kube/config
    
    sudo chown $(id -u):$(id -g) ~/.kube/config
    
    ll ~/.kube/config | grep $USER
    
    # root 變量
    sudo tee -a ~root/.bashrc >/dev/null <<EOF
    export KUBECONFIG=/etc/kubernetes/admin.conf
    EOF
    
    sudo grep KUBECONFIG ~root/.bashrc
    

15. 創(chuàng)建網(wǎng)絡(luò)

    參考 init 的輸出提示

    • https://www.tigera.io/project-calico/
      <kbd>Home</kbd> -> <kbd>Calico Open Source</kbd>
      <kbd>Install</kbd> -> <kbd>CalicoKubernetesSelf-managed on-premises</kbd>
      <Kbd>Install Calico</kbd> -> <kbd>Manifest</kbd> -> <kbd>Install Calico with Kubernetes API datastore, 50 nodes or less</kbd>

      curl https://raw.githubusercontent.com/projectcalico/calico/v3.26.1/manifests/calico.yaml -O
      

    CFILE=calico/v3.26.1/manifests/calico.yaml
    
    if ! curl --connect-timeout 2 google.com &>/dev/null; then
        # C. 國內(nèi)
        CURL=http://k8s.ruitong.cn:8080/K8s
    else
        # A. 國外
        CURL=https://raw.githubusercontent.com/projectcalico
    fi
    
    kubectl apply -f $CURL/$CFILE
    

16. 命令補(bǔ)全 - Client [建議]

    查看幫助

    $ kubectl completion --help
    

    ## 立即生效
    source <(kubectl completion bash)
        
    ## 永久生效
    mkdir ~/.kube 2>/dev/null
    
    kubectl completion bash \
        > ~/.kube/completion.bash.inc
    
    tee -a ~/.bashrc <<EOF >/dev/null
    # Kubectl shell completdion
    source ~/.kube/completion.bash.inc
    EOF
    
    source ~/.bashrc
    
    # kubectl <Tab><Tab>
    

17. 命令別名 - Client[建議]

    參考網(wǎng)址 https://kubernetes.io/zh-cn/docs/reference/kubectl/cheatsheet/

    # 永久生效
    tee -a ~/.bashrc <<EOF >/dev/null
    alias k='kubectl'
    complete -F __start_kubectl k
    EOF
    
    # 立即生效
    source ~/.bashrc
    
    # k <Tab><Tab>
    

[kiosk@k8s-worker1 | k8s-worker2]$

18. 加入集群

    • 參考 init 的輸出提示
    • 找不到提示疚漆，參照附錄 A1

    sudo \
        kubeadm join 192.168.147.128:6443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:49ff7a97c017153baee67c8f44fa84155b8cf06ca8cee067f766ec252cb8d1ac
    

C. 確認(rèn)環(huán)境正常

[kiosk@k8s-master]

$ kubectl get nodes
NAME          STATUS   ROLES           AGE     VERSION
k8s-master    Ready    control-plane   3m42s   v1.27.1
k8s-worker1   Ready    <none>          60s     v1.27.1
k8s-worker2   Ready    <none>          54s     v1.27.1

$ kubectl get pod -A
NAMESPACE     NAME                                       READY   STATUS    RESTARTS   AGE
kube-system   calico-kube-controllers-786b679988-jqmtn   1/1     Running   0          2m58s
kube-system   calico-node-4sbwf                          1/1     Running   0          71s
kube-system   calico-node-cfq42                          1/1     Running   0          65s
kube-system   calico-node-xgmqv                          1/1     Running   0          2m58s
kube-system   coredns-7bdc4cb885-grj7m                   1/1     Running   0          3m46s
kube-system   coredns-7bdc4cb885-hjdkp                   1/1     Running   0          3m46s
kube-system   etcd-k8s-master                            1/1     Running   0          3m50s
kube-system   kube-apiserver-k8s-master                  1/1     Running   0          3m50s
kube-system   kube-controller-manager-k8s-master         1/1     Running   0          3m50s
kube-system   kube-proxy-2cgvn                           1/1     Running   0          3m46s
kube-system   kube-proxy-2zh5k                           1/1     Running   0          65s
kube-system   kube-proxy-nd5z8                           1/1     Running   0          71s
kube-system   kube-scheduler-k8s-master                  1/1     Running   0          3m50s

$ kubectl get componentstatuses
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS    MESSAGE                         ERROR
etcd-0               Healthy   {"health":"true","reason":""}
controller-manager   Healthy   ok
scheduler            Healthy   ok

A. 附錄

A1. 新節(jié)點(diǎn)加入 K8s 集群

• 查看 kubeadm init 命令的輸出
• 使用 kubeadm token create 命令重新創(chuàng)建

[kiosk@k8s-master]$

kubeadm token create --print-join-command

A2. kubeadm reset

還原通過 kubeadm init 或 kubeadm join 對(duì)此主機(jī)所做的更改

[kiosk@k8s-master]$

echo y | sudo kubeadm reset

A3 . Err1

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

[kiosk@k8s-worker2]$

mkdir ~/.kube

scp root@k8s-master:/etc/kubernetes/admin.conf \
    ~/.kube/config

kubectl get node

A4. RHEL布署

• 關(guān)閉 firewalld
• 關(guān)閉 SELinux

# firewalld
systemctl disable --now firewalld

# SELinux
sed -i '/^SELINUX=/s/=.*/=disabled/' \
    /etc/selinux/config

reboot