一、K8S 多节点部署

1.1 拓补图与主机分配

1.2 mster02部署

//在master01上操作
//复制kubernetes目录到master02
[root@master01 k8s]# scp -r /opt/kubernetes/ root@192.168.233.50:/opt

1.2.1 复制master中的三个组件启动脚本kube-apiserver.service kube-controller-manager.service kube-scheduler.service

[root@master01 k8s]# scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@192.168.233.50:/usr/lib/systemd/system/

1.2.2 修改配置文件kube-apiserver中的IP

[root@master02 ~]# cd /opt/kubernetes/cfg/
[root@master02 cfg]# vim kube-apiserver
--bind-address=192.168.233.50 
--advertise-address=192.168.233.50 

1.2.3 拷贝etcd证书给master02使用

## master02一定要有etcd证书
[root@master01 k8s]# scp -r /opt/etcd/ root@192.168.233.50:/opt/

1.2.4 启动master02中的三个组件服务

[root@master02 cfg]# systemctl start kube-apiserver.service 
[root@master02 cfg]# systemctl start kube-controller-manager.service 
[root@master02 cfg]# systemctl start kube-scheduler.service 

1.2.5 增加环境变量

[root@master01  cfg]# vim /etc/profile
#末尾添加
export PATH=$PATH:/opt/kubernetes/bin/
[root@master01 cfg]# source /etc/profile

1.2.6 查看节点

[root@master02 ~]# kubectl get node
NAME              STATUS   ROLES    AGE   VERSION
192.168.233.200   Ready    <none>   23h   v1.12.3
192.168.233.180   Ready    <none>   23h   v1.12.3

1.3 nginx负载均衡集群部署

• 关闭防火墙和核心防护，编辑nginx yum源

[root@nginx01 ~]# systemctl stop firewalld && systemctl disable firewalld	'//关闭防火墙与核心防护'
[root@nginx01 ~]# setenforce 0 && sed -i "s/SELINUX=enforcing/SELNIUX=disabled/g" /etc/selinux/config	
[root@nginx01 ~]# vi /etc/yum.repos.d/nginx.repo 	'//编辑nginx的yum源'
[nginx]
name=nginx.repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
enabled=1
gpgcheck=0
[root@nginx01 ~]# yum clean all

1.3.1 安装nginx 并开启四层转发(nginx02 同)

[root@nginx01 ~]# yum -y install nginx	'//安装nginx'
[root@nginx01 ~]# vi /etc/nginx/nginx.conf 
...省略内容
13  stream {
14 
15     log_format  main  '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
16      access_log  /var/log/nginx/k8s-access.log  main;        ##指定日志目录
17 
18      upstream k8s-apiserver {
19  #此处为master的ip地址和端口 
20          server 192.168.233.100:6443;	'//6443是apiserver的端口号'
21  #此处为master02的ip地址和端口
22          server 192.168.233.50:6443;
23      }
24      server {
25                  listen 6443;
26                  proxy_pass k8s-apiserver;
27      }
28      }
。。。省略内容

1.3.1 启动nginx服务

[root@nginx01 ~]# nginx -t	'//检查nginx语法'
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@nginx01 ~]# systemctl start nginx	'//开启服务'
[root@nginx01 ~]# systemctl status nginx
[root@nginx01 ~]# netstat -ntap |grep nginx	'//会检测出来6443端口'
tcp        0      0 0.0.0.0:6443            0.0.0.0:*               LISTEN      1849/nginx: master  
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1849/nginx: master 

1.3.2 两台nginx主机部署keepalived服务（nginx01的操作,nginx02有细微区别 ）

[root@nginx01 ~]# yum -y install keepalived 
[root@nginx01 ~]# vim /etc/keepalived/keepalived.conf 
! Configuration File for keepalived 

global_defs { 
  # 接收邮件地址 
  notification_email { 
    acassen@firewall.loc 
    failover@firewall.loc 
    sysadmin@firewall.loc 
  } 
  # 邮件发送地址 
  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 "/usr/local/nginx/sbin/check_nginx.sh"	'//keepalived服务检查脚本的位置'
}

vrrp_instance VI_1 { 
   state MASTER 	'//nginx02设置为BACKUP'
   interface ens33
   virtual_router_id 51 # VRRP 路由 ID实例，每个实例是唯一的   nginx02 与nginx01一样
   priority 100    '//优先级，nginx02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 { 
       192.168.233.100/24 	'//VIP地址'
   } 
   track_script {
       check_nginx
   } 
}

1.3.2 创建监控脚本，启动keepalived服务，查看VIP地址

[root@nginx01 ~]# mkdir -p /usr/local/nginx/sbin/	'//创建监控脚本目录'  nginx02 也要写
[root@nginx01 ~]# vim /usr/local/nginx/sbin/check_nginx.sh	'//编写监控脚本配置文件'  
count=$(ps -ef |grep nginx |egrep -cv "grep|$$")

if [ "$count" -eq 0 ];then
   systemctl stop keepalived
fi
[root@nginx01 ~]# chmod +x /usr/local/nginx/sbin/check_nginx.sh	'//给权限'
[root@nginx01 ~]# systemctl start keepalived	'//开启服务'
[root@nginx01 ~]# systemctl status keepalived
[root@nginx01 ~]# ip a	'//两个nginx服务器查看IP地址'
   VIP在nginx01上
[root@nginx02 ~]# ip a

1.3.3 漂移地址的验证与恢复

[root@nginx01 ~]# pkill nginx	'//关闭nginx服务'
[root@nginx01 ~]# systemctl status keepalived	'//发现keepalived服务关闭了'
[root@nginx02 ~]# ip a	'//现在发现VIP地址跑到nginx02上了'
[root@nginx01 ~]# systemctl start nginx
[root@nginx01 ~]# systemctl start keepalived	'//先开启nginx，在启动keepalived服务'
[root@nginx01 ~]# ip a	'//再次查看，发现VIP回到了nginx01节点上'

1.3.4 修改两个node节点配置文件（ootstrap.kubeconfig 、）

[root@node01 ~]# vi /opt/k8s/cfg/bootstrap.kubeconfig 
    server: https://192.168.233.110:6443	'//此地址修改为VIP地址'
[root@node01 ~]# vi /opt/k8s/cfg/kubelet.kubeconfig 
    server: https://192.168.233.110:6443	'//此地址修改为VIP地址'
[root@node01 ~]# vi /opt/k8s/cfg/kube-proxy.kubeconfig 
    server: https://192.168.233.110:6443	'//此地址修改为VIP地址'

1.3.5 重启两个node节点的服务

[root@node01 ~]# systemctl restart kubelet
[root@node01 ~]# systemctl restart kube-proxy
[root@node01 ~]# cd /opt/k8s/cfg/
[root@node01 cfg]# grep 100 *	'//VIP修改成功'
bootstrap.kubeconfig:    server: https://192.168.233.110:6443
kubelet.kubeconfig:    server: https://192.168.233.110:6443
kube-proxy.kubeconfig:    server: https://192.168.233.110:6443

1.3.6 在nginx01上查看k8s日志

[root@nginx01 ~]# tail /var/log/nginx/k8s-access.log 	'//下面的日志是重启服务的时候产生的'
192.168.233.200 192.168.233.100:6443 - [01/May/2020:01:25:59 +0800] 200 1121
192.168.233.200 192.168.233.100:6443 - [01/May/2020:01:25:59 +0800] 200 1121

1.4 master节点测试创建pod

[root@master01 ~]# kubectl run nginx --image=nginx	'//创建一个nginx测试pod'
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
deployment.apps/nginx created
[root@master01 ~]# kubectl get pods	'//查看状态，是正在创建'
NAME                    READY   STATUS              RESTARTS   AGE
nginx-dbddb74b8-5s6h7   0/1     ContainerCreating   0          13s
[root@master02 ~]# kubectl get pods	'//稍等一下再次查看，发现pod已经创建完成，在master02节点也可以查看'
NAME                    READY   STATUS    RESTARTS   AGE
nginx-dbddb74b8-5s6h7   1/1     Running   0          23s

最后

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