Kubernetes集群安装，包含相关脚本，使用kubeadm安装kubernetes一主两从集群

布满荆棘的人生 2022-12-28 16:20 376阅读 0赞

### Kubernetes集群安装，包含相关脚本，使用kubeadm安装kubernetes一主两从集群 ###

*  服务器规划
 *  安装环境版本
 *  服务器免密码登录
 *  部署nginx负载均衡（与Haproxy+Keepalive二选一）
 *   *  Nginx+keepalived高可用
 *  Haproxy+keepalive搭建高可用
 *   *  安装配置haproxy服务
 *  安装Docker环境
 *  安装K8S集群环境
 *   *  安装K8S基础环境
 *  初始化Master节点
 *   *  1.初始化Master节点的网络环境
     *  2.初始化Master节点
     *  3.查看Master节点的初始化结果
 *  初始化Worker节点
 *   *  1.获取join命令参数
     *  2.初始化Worker节点
     *  3.查看初始化结果
 *  K8S安装ingress-nginx
 *   *  1.创建ingress-nginx命名空间
     *  2.安装ingress controller
     *  3.安装K8S SVC：ingress-nginx
     *  4.访问K8S SVC：ingress-nginx
 *  重启K8S集群引起的问题
 *   *  1.Worker节点故障不能启动
     *  2.Pod崩溃或不能正常访问
 *  kubernetes的node重新加入
 *   *  1. 停掉kubelet
     *  2. 删除之前的相关文件
     *  3. 加入集群

相关博文：

*  [k8s集群部署高可用完整版][k8s]
 *  [kubernetes 1.16 二进制集群高可用安装实操踩坑篇][kubernetes 1.16]

# 服务器规划 #

<table> 
 <thead> 
  <tr> 
   <th>IP</th> 
   <th>主机名</th> 
   <th>节点</th> 
   <th>操作系统</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>192.168.175.101</td> 
   <td>binghe101</td> 
   <td>K8S Master</td> 
   <td>CentOS 8.0.1905</td> 
  </tr> 
  <tr> 
   <td>192.168.175.102</td> 
   <td>binghe102</td> 
   <td>K8S Worker</td> 
   <td>CentOS 8.0.1905</td> 
  </tr> 
  <tr> 
   <td>192.168.175.103</td> 
   <td>binghe103</td> 
   <td>K8S Worker</td> 
   <td>CentOS 8.0.1905</td> 
  </tr> 
 </tbody> 
</table>

# 安装环境版本 #

<table> 
 <thead> 
  <tr> 
   <th>软件名称</th> 
   <th>软件版本</th> 
   <th>说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>Docker</td> 
   <td>19.03.8</td> 
   <td>提供容器环境</td> 
  </tr> 
  <tr> 
   <td>docker-compose</td> 
   <td>1.25.5</td> 
   <td>定义和运行由多个容器组成的应用</td> 
  </tr> 
  <tr> 
   <td>K8S</td> 
   <td>1.8.12</td> 
   <td>是一个开源的，用于管理云平台中多个主机上的容器化的应用，Kubernetes的目标是让部署容器化的应用简单并且高效（powerful）,Kubernetes提供了应用部署，规划，更新，维护的一种机制。</td> 
  </tr> 
 </tbody> 
</table>

# 服务器免密码登录 #

在各服务器执行如下命令。

ssh-keygen -t rsa
    cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

将binghe102和binghe103服务器上的id\_rsa.pub文件复制到binghe101服务器。

[root@binghe102 ~]# scp /root/.ssh/id_rsa.pub binghe101:/root/.ssh/102
    [root@binghe103 ~]# scp /root/.ssh/id_rsa.pub binghe101:/root/.ssh/103

在binghe101服务器上执行如下命令。

cat /root/.ssh/142 >> ~/.ssh/authorized_keys
    cat /root/.ssh/144 >> ~/.ssh/authorized_keys

然后将authorized\_keys文件分别复制到binghe102、binghe103服务器。

[root@binghe101 ~]# scp /root/.ssh/authorized_keys binghe102:/root/.ssh/authorized_keys
    [root@binghe101 ~]# scp /root/.ssh/authorized_keys binghe103:/root/.ssh/authorized_keys

删除binghe101节点上~/.ssh下的102和103文件。

rm ~/.ssh/102
    rm ~/.ssh/103

# 部署nginx负载均衡（与Haproxy+Keepalive二选一） #

rpm -vih http://nginx.org/packages/rhel/7/x86_64/RPMS/nginx-1.16.0-1.el7.ngx.x86_64.rpm
    # vim /etc/nginx/nginx.conf
    ……
    stream { 
    
        log_format  main  '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
    
        access_log  /var/log/nginx/k8s-access.log  main;
    
        upstream k8s-apiserver { 
                    server 192.168.0.131:6443;
                    server 192.168.0.132:6443;
                }
        
        server { 
           listen 6443;
           proxy_pass k8s-apiserver;
        }
    }
    ……
    
    #启动nginx
    systemctl start nginx
    systemctl enable nginx

## Nginx+keepalived高可用 ##

###主节点
    # yum install keepalived
    # vi /etc/keepalived/keepalived.conf
    global_defs {  
       notification_email {  
         acassen@firewall.loc 
         failover@firewall.loc 
         sysadmin@firewall.loc 
       } 
       notification_email_from Alexandre.Cassen@firewall.loc  
       smtp_server 127.0.0.1 
       smtp_connect_timeout 30 
       router_id NGINX_MASTER
    } 
    
    vrrp_script check_nginx { 
        script "/etc/keepalived/check_nginx.sh"
    }
    
    vrrp_instance VI_1 {  
        state MASTER 
        interface ens32
        virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的 
        priority 100    # 优先级，备服务器设置 90 
        advert_int 1    # 指定VRRP 心跳包通告间隔时间，默认1秒 
        authentication {  
            auth_type PASS      
            auth_pass 1111 
        }  
        virtual_ipaddress {  
            192.168.0.130/24
        } 
        track_script { 
            check_nginx
        } 
    }
    
    # cat /etc/keepalived/check_nginx.sh 
    #!/bin/bash
    count=$(ps -ef |grep nginx |egrep -cv "grep|$$")
    
    if [ "$count" -eq 0 ];then
        exit 1
    else
        exit 0
    fi
    # systemctl start keepalived
    # systemctl enable keepalived
    
    ###备节点
    #vim /etc/keepalived/keepalived.conf
    global_defs {  
       notification_email {  
         acassen@firewall.loc 
         failover@firewall.loc 
         sysadmin@firewall.loc 
       } 
       notification_email_from Alexandre.Cassen@firewall.loc  
       smtp_server 127.0.0.1 
       smtp_connect_timeout 30 
       router_id NGINX_BACKUP
    } 
    
    vrrp_script check_nginx { 
        script "/etc/keepalived/check_nginx.sh"
    }
    
    vrrp_instance VI_1 {  
        state BACKUP 
        interface ens32
        virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的 
        priority 90    # 优先级，备服务器设置 90 
        advert_int 1    # 指定VRRP 心跳包通告间隔时间，默认1秒 
        authentication {  
            auth_type PASS      
            auth_pass 1111 
        }  
        virtual_ipaddress {  
            192.168.0.130/24
        } 
        track_script { 
            check_nginx
        } 
    }
    
    # cat /etc/keepalived/check_nginx.sh 
    #!/bin/bash
    count=$(ps -ef |grep nginx |egrep -cv "grep|$$")
    
    if [ "$count" -eq 0 ];then
        exit 1
    else
        exit 0
    fi
    
    # systemctl start keepalived
    # systemctl enable keepalived
    
    ###测试VIP是否正常工作
    curl -k --header "Authorization: Bearer 8762670119726309a80b1fe94eb66e93" https://192.168.0.130:6443/version
    { 
      "major": "1",
      "minor": "18",
      "gitVersion": "v1.18.2",
      "gitCommit": "52c56ce7a8272c798dbc29846288d7cd9fbae032",
      "gitTreeState": "clean",
      "buildDate": "2020-04-16T11:48:36Z",
      "goVersion": "go1.13.9",
      "compiler": "gc",
      "platform": "linux/amd64"
    }

# Haproxy+keepalive搭建高可用 #

## 安装配置haproxy服务 ##

1.安装haproxy
    [root@k8s-master01 ~]# yum install -y haproxy
    2.配置haproxy
    cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.ori
    cat /etc/haproxy/haproxy.cfg
    global
        log /dev/log local0
        log /dev/log local1 notice
        chroot /var/lib/haproxy
        stats socket /var/run/haproxy-admin.sock mode 660 level admin
        stats timeout 30s
        user haproxy
        group haproxy
        daemon
        nbproc 1
    defaults
        log global
        timeout connect 5000
        timeout client 10m
        timeout server 10m
    listen admin_stats
        bind 0.0.0.0:10080
        mode http
        log 127.0.0.1 local0 err
        stats refresh 30s
        stats uri /status
        stats realm welcome login\ Haproxy
        stats auth along:along123
        stats hide-version
        stats admin if TRUE
    listen kube-master
        bind 0.0.0.0:8443
        mode tcp
        option tcplog
        balance source
        server 192.168.10.11 192.168.10.11:6443 check inter 2000 fall 2 rise 2 weight 1
        server 192.168.10.12 192.168.10.12:6443 check inter 2000 fall 2 rise 2 weight 1
        server 192.168.10.13 192.168.10.13:6443 check inter 2000 fall 2 rise 2 weight 1
    
    3.启动haproxy
    systemctl restart haproxy
    [root@k8s-master01 ~]# systemctl enable haproxy
    Created symlink from /etc/systemd/system/multi-user.target.wants/haproxy.service to /usr/lib/systemd/system/haproxy.service.
    [root@k8s-master01 ~]# systemctl status haproxy
    ● haproxy.service - HAProxy Load Balancer
       Loaded: loaded (/usr/lib/systemd/system/haproxy.service; enabled; vendor preset: disabled)
       Active: active (running) since 五 2020-04-10 16:35:46 CST; 24s ago
     Main PID: 10235 (haproxy-systemd)
       CGroup: /system.slice/haproxy.service
               ├─10235 /usr/sbin/haproxy-systemd-wrapper -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid
               ├─10236 /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -Ds
               └─10237 /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -Ds

# 安装Docker环境 #

**本文档基于Docker 19.03.8 版本搭建Docker环境。**

在所有服务器上创建install\_docker.sh脚本，脚本内容如下所示。

#!/bin/bash
    export REGISTRY_MIRROR=https://registry.cn-hangzhou.aliyuncs.com
    dnf install yum*
    yum install -y yum-utils device-mapper-persistent-data lvm2
    yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    dnf install https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.13-3.1.el7.x86_64.rpm
    yum install -y docker-ce-19.03.8 docker-ce-cli-19.03.8
    #配置docker镜像加速
    vi /etc/docker/daemon.json 
    { 
      "registry-mirrors": ["https://bk6kzfqm.mirror.aliyuncs.com"],
      "insecure-registries": ["192.168.0.241"],
      "log-driver": "json-file",
      "log-opts": { 
        "max-size": "100m"
      },
      "storage-driver": "overlay2",
      "storage-opts": [
        "overlay2.override_kernel_check=true"
      ]
    }
    systemctl enable docker.service
    systemctl start docker.service
    docker version

在每台服务器上为install\_docker.sh脚本赋予可执行权限，并执行脚本即可。

# 安装K8S集群环境 #

**本文档基于K8S 1.8.12版本来搭建K8S集群**

## 安装K8S基础环境 ##

在所有服务器上创建install\_k8s.sh脚本文件，脚本文件的内容如下所示。

#!/bin/bash
    #设置hosts
    cat >> /etc/hosts << EOF 192.168.0.140 master 192.168.0.142 slave3 192.168.0.144 slave4 EOF
    
    #安装nfs-utils
    yum install -y nfs-utils
    yum install -y wget
    
    #同步系统时间：
    yum install -y ntpdate
    ntpdate time.windows.com
    
    #启动nfs-server
    systemctl start nfs-server
    systemctl enable nfs-server
    
    #关闭防火墙
    systemctl stop firewalld
    systemctl disable firewalld
    
    #关闭SeLinux
    #临时关闭
    setenforce 0	
    #永久关闭
    sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
    
    # 关闭 swap
    # 临时关闭
    swapoff -a
    #永久关闭
    sed -i 's/.*swap.*/#&/' /etc/fstab
    cat /etc/fstab
    
    #修改 /etc/sysctl.conf
    # 如果有配置，则修改
    sed -i "s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g"  /etc/sysctl.conf
    sed -i "s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g"  /etc/sysctl.conf
    sed -i "s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g"  /etc/sysctl.conf
    sed -i "s#^net.ipv6.conf.all.disable_ipv6.*#net.ipv6.conf.all.disable_ipv6=1#g"  /etc/sysctl.conf
    sed -i "s#^net.ipv6.conf.default.disable_ipv6.*#net.ipv6.conf.default.disable_ipv6=1#g"  /etc/sysctl.conf
    sed -i "s#^net.ipv6.conf.lo.disable_ipv6.*#net.ipv6.conf.lo.disable_ipv6=1#g"  /etc/sysctl.conf
    sed -i "s#^net.ipv6.conf.all.forwarding.*#net.ipv6.conf.all.forwarding=1#g"  /etc/sysctl.conf
    # 可能没有，追加
    echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
    echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf
    echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf
    echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
    echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
    echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf
    echo "net.ipv6.conf.all.forwarding = 1"  >> /etc/sysctl.conf
    # 执行命令以应用
    sysctl -p
    
    # 配置K8S的yum源
    cat <<EOF > /etc/yum.repos.d/kubernetes.repo
    [kubernetes]
    name=Kubernetes
    baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
    enabled=1
    gpgcheck=0
    repo_gpgcheck=0
    gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
           http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
    EOF
    
    # 卸载旧版本K8S
    yum remove -y kubelet kubeadm kubectl
    
    # 安装kubelet、kubeadm、kubectl，这里我安装的是1.18.2版本
    yum install -y kubelet-1.18.2 kubeadm-1.18.2 kubectl-1.18.2
    
    # 修改docker Cgroup Driver为systemd
    # # 将/usr/lib/systemd/system/docker.service文件中的这一行 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
    # # 修改为 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd
    # 如果不修改，在添加 worker 节点时可能会碰到如下错误
    # [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". 
    # Please follow the guide at https://kubernetes.io/docs/setup/cri/
    sed -i "s#^ExecStart=/usr/bin/dockerd.*#ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd#g" /usr/lib/systemd/system/docker.service
    
    # 设置 docker 镜像，提高 docker 镜像下载速度和稳定性
    # 如果访问 https://hub.docker.io 速度非常稳定，亦可以跳过这个步骤
    # curl -sSL https://kuboard.cn/install-script/set_mirror.sh | sh -s ${REGISTRY_MIRROR}
    
    # 重启 docker，并启动 kubelet
    systemctl daemon-reload
    systemctl restart docker
    systemctl enable kubelet && systemctl start kubelet
    
    docker version

在每台服务器上为install\_k8s.sh脚本赋予可执行权限，并执行脚本即可。

# 初始化Master节点 #

**只在binghe101服务器上执行的操作。**

## 1.初始化Master节点的网络环境 ##

注意：下面的命令需要在命令行手动执行。

# 只在 master 节点执行
    # export 命令只在当前 shell 会话中有效，开启新的 shell 窗口后，如果要继续安装过程，请重新执行此处的 export 命令
    export MASTER_IP=192.168.175.101
    # 替换 k8s.master 为 您想要的 dnsName
    export APISERVER_NAME=k8s.master
    # Kubernetes 容器组所在的网段，该网段安装完成后，由 kubernetes 创建，事先并不存在于物理网络中
    export POD_SUBNET=172.18.0.1/16
    echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts

## 2.初始化Master节点 ##

在binghe101服务器上创建init\_master.sh脚本文件，文件内容如下所示。

#!/bin/bash
    # 脚本出错时终止执行
    set -e
    
    if [ ${#POD_SUBNET} -eq 0 ] || [ ${#APISERVER_NAME} -eq 0 ]; then
      echo -e "\033[31;1m请确保您已经设置了环境变量 POD_SUBNET 和 APISERVER_NAME \033[0m"
      echo 当前POD_SUBNET=$POD_SUBNET
      echo 当前APISERVER_NAME=$APISERVER_NAME
      exit 1
    fi
    
    
    # 查看完整配置选项 https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2
    rm -f ./kubeadm-config.yaml
    cat <<EOF > ./kubeadm-config.yaml
    apiVersion: kubeadm.k8s.io/v1beta2
    kind: ClusterConfiguration
    kubernetesVersion: v1.18.2
    imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
    controlPlaneEndpoint: "${APISERVER_NAME}:6443"
    networking:
      serviceSubnet: "10.96.0.0/16"
      podSubnet: "${POD_SUBNET}"
      dnsDomain: "cluster.local"
    EOF
    
    # kubeadm init
    # 根据服务器网速的情况，您需要等候 3 - 10 分钟
    kubeadm init --config=kubeadm-config.yaml --upload-certs
    
    # 配置 kubectl
    rm -rf /root/.kube/
    mkdir /root/.kube/
    cp -i /etc/kubernetes/admin.conf /root/.kube/config
    
    # 安装 calico 网络插件
    # 参考文档 https://docs.projectcalico.org/v3.13/getting-started/kubernetes/self-managed-onprem/onpremises
    echo "安装calico-3.13.1"
    rm -f calico-3.13.1.yaml
    wget https://kuboard.cn/install-script/calico/calico-3.13.1.yaml
    kubectl apply -f calico-3.13.1.yaml

赋予init\_master.sh脚本文件可执行权限并执行脚本。

## 3.查看Master节点的初始化结果 ##

**（1）确保所有容器组处于Running状态**

# 执行如下命令，等待 3-10 分钟，直到所有的容器组处于 Running 状态
    watch kubectl get pod -n kube-system -o wide

具体执行如下所示。

[root@binghe101 ~]# watch kubectl get pod -n kube-system -o wide
    Every 2.0s: kubectl get pod -n kube-system -o wide                                                                                                                          binghe101: Sun May 10 11:01:32 2020
    
    NAME                                       READY   STATUS    RESTARTS   AGE    IP                NODE        NOMINATED NODE   READINESS GATES          
    calico-kube-controllers-5b8b769fcd-5dtlp   1/1     Running   0          118s   172.18.203.66     binghe101   <none>           <none>          
    calico-node-fnv8g                          1/1     Running   0          118s   192.168.175.101   binghe101   <none>           <none>          
    coredns-546565776c-27t7h                   1/1     Running   0          2m1s   172.18.203.67     binghe101   <none>           <none>          
    coredns-546565776c-hjb8z                   1/1     Running   0          2m1s   172.18.203.65     binghe101   <none>           <none>          
    etcd-binghe101                             1/1     Running   0          2m7s   192.168.175.101   binghe101   <none>           <none>          
    kube-apiserver-binghe101                   1/1     Running   0          2m7s   192.168.175.101   binghe101   <none>           <none>          
    kube-controller-manager-binghe101          1/1     Running   0          2m7s   192.168.175.101   binghe101   <none>           <none>          
    kube-proxy-dvgsr                           1/1     Running   0          2m1s   192.168.175.101   binghe101   <none>           <none>          
    kube-scheduler-binghe101                   1/1     Running   0          2m7s   192.168.175.101   binghe101   <none>           <none>

**（2） 查看 Master 节点初始化结果**

kubectl get nodes -o wide

具体执行如下所示。

[root@binghe101 ~]# kubectl get nodes -o wide
    NAME        STATUS   ROLES    AGE     VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION         CONTAINER-RUNTIME
    binghe101   Ready    master   3m28s   v1.18.2   192.168.175.101   <none>        CentOS Linux 8 (Core)   4.18.0-80.el8.x86_64   docker://19.3.8

# 初始化Worker节点 #

## 1.获取join命令参数 ##

在Master节点（binghe101服务器）上执行如下命令获取join命令参数。

kubeadm token create --print-join-command

具体执行如下所示。

[root@binghe101 ~]# kubeadm token create --print-join-command
    W0510 11:04:34.828126   56132 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
    kubeadm join k8s.master:6443 --token 8nblts.62xytoqufwsqzko2     --discovery-token-ca-cert-hash sha256:1717cc3e34f6a56b642b5751796530e367aa73f4113d09994ac3455e33047c0d

其中，有如下一行输出。

kubeadm join k8s.master:6443 --token 8nblts.62xytoqufwsqzko2     --discovery-token-ca-cert-hash sha256:1717cc3e34f6a56b642b5751796530e367aa73f4113d09994ac3455e33047c0d

这行代码就是获取到的join命令。

> 注意：join命令中的token的有效时间为 2 个小时，2小时内，可以使用此 token 初始化任意数量的 worker 节点。

## 2.初始化Worker节点 ##

针对所有的 worker 节点执行，在这里，就是在binghe102服务器和binghe103服务器上执行。

在命令分别手动执行如下命令。

# 只在 worker 节点执行
    # 192.168.175.101 为 master 节点的内网 IP
    export MASTER_IP=192.168.175.101
    # 替换 k8s.master 为初始化 master 节点时所使用的 APISERVER_NAME
    export APISERVER_NAME=k8s.master
    echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts
    
    # 替换为 master 节点上 kubeadm token create 命令输出的join
    kubeadm join k8s.master:6443 --token 8nblts.62xytoqufwsqzko2     --discovery-token-ca-cert-hash sha256:1717cc3e34f6a56b642b5751796530e367aa73f4113d09994ac3455e33047c0d

具体执行如下所示。

[root@binghe102 ~]# export MASTER_IP=192.168.175.101
    [root@binghe102 ~]# export APISERVER_NAME=k8s.master
    [root@binghe102 ~]# echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts
    [root@binghe102 ~]# kubeadm join k8s.master:6443 --token 8nblts.62xytoqufwsqzko2 --discovery-token-ca-cert-hash sha256:1717cc3e34f6a56b642b5751796530e367aa73f4113d09994ac3455e33047c0d 
    W0510 11:08:27.709263   42795 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
    [preflight] Running pre-flight checks
            [WARNING FileExisting-tc]: tc not found in system path
    [preflight] Reading configuration from the cluster...
    [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
    [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace
    [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
    [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
    [kubelet-start] Starting the kubelet
    [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
    
    This node has joined the cluster:
    * Certificate signing request was sent to apiserver and a response was received.
    * The Kubelet was informed of the new secure connection details.
    
    Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

根据输出结果可以看出，Worker节点加入了K8S集群。

> 注意：kubeadm join…就是master 节点上 kubeadm token create 命令输出的join。

## 3.查看初始化结果 ##

在Master节点（binghe101服务器）执行如下命令查看初始化结果。

kubectl get nodes -o wide

具体执行如下所示。

[root@binghe101 ~]# kubectl get nodes
    NAME        STATUS   ROLES    AGE     VERSION
    binghe101   Ready    master   20m     v1.18.2
    binghe102   Ready    <none>   2m46s   v1.18.2
    binghe103   Ready    <none>   2m46s   v1.18.2

> 注意：kubectl get nodes命令后面加上-o wide参数可以输出更多的信息。

# K8S安装ingress-nginx #

**注意：在Master节点（binghe101服务器上执行）**

## 1.创建ingress-nginx命名空间 ##

创建ingress-nginx-namespace.yaml文件，文件内容如下所示。

apiVersion: v1
    kind: Namespace
    metadata:
      name: ingress-nginx
      labels:
        name: ingress-nginx

执行如下命令创建ingress-nginx命名空间。

kubectl apply -f ingress-nginx-namespace.yaml

## 2.安装ingress controller ##

创建ingress-nginx-mandatory.yaml文件，文件内容如下所示。

apiVersion: v1
    kind: Namespace
    metadata:
      name: ingress-nginx
    
    ---
    
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: default-http-backend
      labels:
        app.kubernetes.io/name: default-http-backend
        app.kubernetes.io/part-of: ingress-nginx
      namespace: ingress-nginx
    spec:
      replicas: 1
      selector:
        matchLabels:
          app.kubernetes.io/name: default-http-backend
          app.kubernetes.io/part-of: ingress-nginx
      template:
        metadata:
          labels:
            app.kubernetes.io/name: default-http-backend
            app.kubernetes.io/part-of: ingress-nginx
        spec:
          terminationGracePeriodSeconds: 60
          containers:
            - name: default-http-backend
              # Any image is permissible as long as:
              # 1. It serves a 404 page at /
              # 2. It serves 200 on a /healthz endpoint
              image: registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/defaultbackend-amd64:1.5
              livenessProbe:
                httpGet:
                  path: /healthz
                  port: 8080
                  scheme: HTTP
                initialDelaySeconds: 30
                timeoutSeconds: 5
              ports:
                - containerPort: 8080
              resources:
                limits:
                  cpu: 10m
                  memory: 20Mi
                requests:
                  cpu: 10m
                  memory: 20Mi
    
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: default-http-backend
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: default-http-backend
        app.kubernetes.io/part-of: ingress-nginx
    spec:
      ports:
        - port: 80
          targetPort: 8080
      selector:
        app.kubernetes.io/name: default-http-backend
        app.kubernetes.io/part-of: ingress-nginx
    
    ---
    
    kind: ConfigMap
    apiVersion: v1
    metadata:
      name: nginx-configuration
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    
    ---
    
    kind: ConfigMap
    apiVersion: v1
    metadata:
      name: tcp-services
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    
    ---
    
    kind: ConfigMap
    apiVersion: v1
    metadata:
      name: udp-services
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    
    ---
    
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: nginx-ingress-serviceaccount
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    
    ---
    apiVersion: rbac.authorization.k8s.io/v1beta1
    kind: ClusterRole
    metadata:
      name: nginx-ingress-clusterrole
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    rules:
      - apiGroups:
          - ""
        resources:
          - configmaps
          - endpoints
          - nodes
          - pods
          - secrets
        verbs:
          - list
          - watch
      - apiGroups:
          - ""
        resources:
          - nodes
        verbs:
          - get
      - apiGroups:
          - ""
        resources:
          - services
        verbs:
          - get
          - list
          - watch
      - apiGroups:
          - "extensions"
        resources:
          - ingresses
        verbs:
          - get
          - list
          - watch
      - apiGroups:
          - ""
        resources:
          - events
        verbs:
          - create
          - patch
      - apiGroups:
          - "extensions"
        resources:
          - ingresses/status
        verbs:
          - update
    
    ---
    apiVersion: rbac.authorization.k8s.io/v1beta1
    kind: Role
    metadata:
      name: nginx-ingress-role
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    rules:
      - apiGroups:
          - ""
        resources:
          - configmaps
          - pods
          - secrets
          - namespaces
        verbs:
          - get
      - apiGroups:
          - ""
        resources:
          - configmaps
        resourceNames:
          # Defaults to "<election-id>-<ingress-class>"
          # Here: "<ingress-controller-leader>-<nginx>"
          # This has to be adapted if you change either parameter
          # when launching the nginx-ingress-controller.
          - "ingress-controller-leader-nginx"
        verbs:
          - get
          - update
      - apiGroups:
          - ""
        resources:
          - configmaps
        verbs:
          - create
      - apiGroups:
          - ""
        resources:
          - endpoints
        verbs:
          - get
    
    ---
    apiVersion: rbac.authorization.k8s.io/v1beta1
    kind: RoleBinding
    metadata:
      name: nginx-ingress-role-nisa-binding
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: Role
      name: nginx-ingress-role
    subjects:
      - kind: ServiceAccount
        name: nginx-ingress-serviceaccount
        namespace: ingress-nginx
    
    ---
    apiVersion: rbac.authorization.k8s.io/v1beta1
    kind: ClusterRoleBinding
    metadata:
      name: nginx-ingress-clusterrole-nisa-binding
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: nginx-ingress-clusterrole
    subjects:
      - kind: ServiceAccount
        name: nginx-ingress-serviceaccount
        namespace: ingress-nginx
    
    ---
    
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: nginx-ingress-controller
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    spec:
      replicas: 1
      selector:
        matchLabels:
          app.kubernetes.io/name: ingress-nginx
          app.kubernetes.io/part-of: ingress-nginx
      template:
        metadata:
          labels:
            app.kubernetes.io/name: ingress-nginx
            app.kubernetes.io/part-of: ingress-nginx
          annotations:
            prometheus.io/port: "10254"
            prometheus.io/scrape: "true"
        spec:
          serviceAccountName: nginx-ingress-serviceaccount
          containers:
            - name: nginx-ingress-controller
              image: registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/nginx-ingress-controller:0.20.0
              args:
                - /nginx-ingress-controller
                - --default-backend-service=$(POD_NAMESPACE)/default-http-backend
                - --configmap=$(POD_NAMESPACE)/nginx-configuration
                - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
                - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
                - --publish-service=$(POD_NAMESPACE)/ingress-nginx
                - --annotations-prefix=nginx.ingress.kubernetes.io
              securityContext:
                capabilities:
                  drop:
                    - ALL
                  add:
                    - NET_BIND_SERVICE
                # www-data -> 33
                runAsUser: 33
              env:
                - name: POD_NAME
                  valueFrom:
                    fieldRef:
                      fieldPath: metadata.name
                - name: POD_NAMESPACE
                  valueFrom:
                    fieldRef:
                      fieldPath: metadata.namespace
              ports:
                - name: http
                  containerPort: 80
                - name: https
                  containerPort: 443
              livenessProbe:
                failureThreshold: 3
                httpGet:
                  path: /healthz
                  port: 10254
                  scheme: HTTP
                initialDelaySeconds: 10
                periodSeconds: 10
                successThreshold: 1
                timeoutSeconds: 1
              readinessProbe:
                failureThreshold: 3
                httpGet:
                  path: /healthz
                  port: 10254
                  scheme: HTTP
                periodSeconds: 10
                successThreshold: 1
                timeoutSeconds: 1
    
    ---

执行如下命令安装ingress controller。

kubectl apply -f ingress-nginx-mandatory.yaml

## 3.安装K8S SVC：ingress-nginx ##

主要是用来用于暴露pod：nginx-ingress-controller。

创建service-nodeport.yaml文件，文件内容如下所示。ls

apiVersion: v1
    kind: Service
    metadata:
      name: ingress-nginx
      namespace: ingress-nginx
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
    spec:
      type: NodePort
      ports:
        - name: http
          port: 80
          targetPort: 80
          protocol: TCP
          nodePort: 30080
        - name: https
          port: 443
          targetPort: 443
          protocol: TCP
          nodePort: 30443
      selector:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx

执行如下命令安装。

kubectl apply -f service-nodeport.yaml

## 4.访问K8S SVC：ingress-nginx ##

查看ingress-nginx命名空间的部署情况，如下所示。

[root@binghe101 k8s]# kubectl get pod -n ingress-nginx
    NAME                                        READY   STATUS    RESTARTS   AGE
    default-http-backend-796ddcd9b-vfmgn        1/1     Running   1          10h
    nginx-ingress-controller-58985cc996-87754   1/1     Running   2          10h

在命令行服务器命令行输入如下命令查看ingress-nginx的端口映射情况。

kubectl get svc -n ingress-nginx

具体如下所示。

[root@binghe101 k8s]# kubectl get svc -n ingress-nginx 
    NAME                   TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)                      AGE
    default-http-backend   ClusterIP   10.96.247.2   <none>        80/TCP                       7m3s
    ingress-nginx          NodePort    10.96.40.6    <none>        80:30080/TCP,443:30443/TCP   4m35s

所以，可以通过Master节点（binghe101服务器）的IP地址和30080端口号来访问ingress-nginx，如下所示。

[root@binghe101 k8s]# curl 192.168.175.101:30080 
    default backend - 404

也可以在浏览器打开http://192.168.175.101:30080 来访问ingress-nginx，如下所示。  
![img][]

# 重启K8S集群引起的问题 #

## 1.Worker节点故障不能启动 ##

Master 节点的 IP 地址发生变化，导致 worker 节点不能启动。需要重新安装K8S集群，并确保所有节点都有固定的内网 IP 地址。

## 2.Pod崩溃或不能正常访问 ##

重启服务器后使用如下命令查看Pod的运行状态。

kubectl get pods --all-namespaces

发现很多 Pod 不在 Running 状态，此时，需要使用如下命令删除运行不正常的Pod。

kubectl delete pod <pod-name> -n <pod-namespece>

> 注意：如果Pod 是使用 Deployment、StatefulSet 等控制器创建的，K8S 将创建新的 Pod 作为替代，重新启动的 Pod 通常能够正常工作。

# kubernetes的node重新加入 #

注意:以下操作在node下操作

## 1. 停掉kubelet ##

systemctl stop kubelet

## 2. 删除之前的相关文件 ##

rm -rf /etc/kubernetes/*

## 3. 加入集群 ##

kubeadm join 192.168.233.3:6443

[k8s]: https://www.cnblogs.com/yuezhimi/p/12931002.html
[kubernetes 1.16]: https://blog.csdn.net/sfdst/article/details/105813485
[img]: /images/20221120/360f6f6eb13749b7bc8a87988d019509.png