1、在hosts中添加VIP（虚拟IP）地址
vim /etc/hosts

vim /etc/hosts

2、2个master和node安装的内容是不同的
第1个master：1、keepalived2、haproxy3、初始化操作 4、安装docker和网络插件
第2个master：1、keepalived2、haproxy3、添加master2到集群中 4、安装docker和网络插件
node：加入到集群中 2、安装docker和网络插件

3、所有master节点部署keepalived

安装keepalived所需要的包

yum install -y conntrack-tools libseccomp libtool-ltdl

安装keepalived

 yum install -y keepalived

4、master节点都添加keepalived.conf
这里需要修改对应的网卡，我的网卡是ens32
修改虚拟IP

4.1 master1的配置

cat > /etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived

global_defs {
   router_id k8s
}

vrrp_script check_haproxy {
    script "killall -0 haproxy"
    interval 3
    weight -2
    fall 10
    rise 2
}

vrrp_instance VI_1 {
    state MASTER 
    interface ens32 
    virtual_router_id 51
    priority 250
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass ceb1b3ec013d66163d6ab
    }
    virtual_ipaddress {
        192.168.102.51
    }
    track_script {
        check_haproxy
    }

}
EOF

4.2 master2的节点

! Configuration File for keepalived

global_defs {
   router_id k8s
}

vrrp_script check_haproxy {
    script "killall -0 haproxy"
    interval 3
    weight -2
    fall 10
    rise 2
}

vrrp_instance VI_1 {
    state BACKUP 
    interface ens32 
    virtual_router_id 51
    priority 200
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass ceb1b3ec013d66163d6ab
    }
    virtual_ipaddress {
        192.168.102.51
    }
    track_script {
        check_haproxy
    }

}

5、两台master启动keepalived

systemctl start keepalived.service

设置开机启动

systemctl enable keepalived.service

查看启动状态

systemctl status keepalived.service

ip a s ens32

在其中一台master节点可以看到其中一台有虚拟ip,当其中一台挂了，ip则会转移到另一台

6、两台master节点上安装haproxy

yum install haproxy

修改配置（master都要执行，需要改IP）

cat > /etc/haproxy/haproxy.cfg << EOF
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    # to have these messages end up in /var/log/haproxy.log you will
    # need to:
    # 1) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    # 2) configure local2 events to go to the /var/log/haproxy.log
    #   file. A line like the following can be added to
    #   /etc/sysconfig/syslog
    #
    #    local2.*                       /var/log/haproxy.log
    #
    log         127.0.0.1 local2
    
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon 
       
    # turn on stats unix socket
    stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------  
defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000
#---------------------------------------------------------------------
# kubernetes apiserver frontend which proxys to the backends
#--------------------------------------------------------------------- 
frontend kubernetes-apiserver
    mode                 tcp
    bind                 *:16443
    option               tcplog
    default_backend      kubernetes-apiserver    
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend kubernetes-apiserver
    mode        tcp
    balance     roundrobin
    server      hadoop100   192.168.102.48:6443 check  #只需要修改ip
    server      hadoop101   192.168.102.49:6443 check
#---------------------------------------------------------------------
# collection haproxy statistics message
#---------------------------------------------------------------------
listen stats
    bind                 *:1080
    stats auth           admin:awesomePassword
    stats refresh        5s
    stats realm          HAProxy\ Statistics
    stats uri            /admin?stats
EOF

启动haproxy

systemctl start haproxy

设置为开机启动

systemctl enable haproxy

查看状态

 systemctl status haproxy

7、配置dockera阿里云yum源

cat >/etc/yum.repos.d/docker.repo<<EOF
[docker-ce-edge]
name=Docker CE Edge - \$basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7/\$basearch/edge
enabled=1
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
EOF

8、安装docker（三台机器都要安装）

yum -y install docker-ce

8.1查看docker版本

docker --version  

8.2启动docker

systemctl enable docker

systemctl start docker

8.3 配置docker的镜像源

cat >> /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF

然后重启docker

systemctl restart docker

9、安装kubeadm，kubelet和kubectl指定版本（三台机器都要安装）

cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0

设置开机启动

systemctl enable kubelet

创建init文件
vi kubeadm-config.yaml

apiServer:
  certSANs:
    - hadoop100
    - hadoop101
    - hadoop100.vip
    - 192.168.102.48
    - 192.168.102.49
    - 192.168.102.51
    - 127.0.0.1
  extraArgs:
    authorization-mode: Node,RBAC
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta1
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: "hadoop100.vip:16443"
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: registry.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.18.0
networking:
  dnsDomain: cluster.local
  podSubnet: 10.244.0.0/16
  serviceSubnet: 10.1.0.0/16
scheduler: {}

在master1上执行初始化

kubeadm init --config kubeadm-config.yaml

成功初始化

执行下方命令

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

查看节点

kubectl get nodes

查看pod

kubectl get pods -n kube-system

10、master2加入到主节点
把master1的证书什么的复制到master2
下面四条命令在master1执行，ip自己灵活变化

ssh root@192.168.102.49 mkdir -p /etc/kubernetes/pki/etcd

scp /etc/kubernetes/admin.conf root@192.168.102.49:/etc/kubernetes

scp /etc/kubernetes/pki/{ca.*,sa.*,front-proxy-ca.*} root@192.168.102.49:/etc/kubernetes/pki

 scp /etc/kubernetes/pki/etcd/ca.* root@192.168.102.49:/etc/kubernetes/pki/etcd

如果路径没权限，在master执行

chmod 777 /etc/kubernetes

加入到集群（这里的集群不是复制这里的就好，具体看自己初始化master1圈的图，复制起来添加就好了）

kubeadm join hadoop100.vip:16443 --token vyfxn4.95q57l1dqlpxj5wb --discovery-token-ca-cert-hash sha256:dcdb1fac406137f5f5e478665e29cb7bcdcf578f14bac331d30431c3f5b5cd87 --control-plane

添加成功如图（这里报错可以参考这个地址https://blog.csdn.net/weixin_43205308/article/details/129740892）

执行下方命令

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

11、添加node节点

kubeadm join hadoop100.vip:16443 --token vyfxn4.95q57l1dqlpxj5wb --discovery-token-ca-cert-hash sha256:dcdb1fac406137f5f5e478665e29cb7bcdcf578f14bac331d30431c3f5b5cd87

12、安装flannel网络插件在master1或master2执行

wget -c https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

kubectl apply -f kube-flannel.yml 

13、查看集群node的状态以下则证明成功

14、创建例子（到这一步就不用我说这三个命令了）

kubectl create deployment nginx --image=nginx

kubectl expose deployment nginx --port=80 --type=NodePort

kubectl get pod,svc

15、原理图

16、参考资料

https://gitee.com/moxi159753/LearningNotes/tree/master/K8S/18_Kubernetes%E6%90%AD%E5%BB%BA%E9%AB%98%E5%8F%AF%E7%94%A8%E9%9B%86%E7%BE%A4