docker-部署Keepalived实现Nginx高可用

阿里云国内75折回扣微信号：monov8

阿里云国际，腾讯云国际，低至75折。AWS 93折免费开户实名账号代冲值优惠多多微信号：monov8 飞机：@monov6

一、服务器环境

二、流程图

Keepalived是一款基于VRRP协议的高可用集群软件通过虚拟IPVIP对外提供服务能够实时监控集群中服务器的运行状态并自动进行故障隔离这些服务器都启动着相同的服务当主服务器发生故障时会自动将虚拟IP漂移到备份服务器从而实现业务高可用。

一、服务器环境

两台服务器10.100.1.123、10.100.1.125

虚拟IP10.100.1.155

二、流程图

三、部署Nginx

1、获取镜像

docker pull nginx:1.20.0

2、配置文件

mkdir -p /home/docker/nginx/conf
cd /home/docker/nginx/conf
vi nginx.conf

user  root;
worker_processes  1;
events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    sendfile        on;
    keepalive_timeout  65;
    server {
        listen       80;
        location / {
            root   /usr/share/nginx/html;
            index  index.html index.htm;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   /home/nginx-demo/html;
        }
    }
}

3、设计默认页面

mkdir -p /home/docker/nginx/html
cd /home/docker/nginx/html
vi index.html

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>Load One</p>
</body>
</html>

同理另一台服务器也做上述操作

4、启动容器

docker run -d  \
--name nginx \
-v /home/docker/nginx/html:/usr/share/nginx/html \
-v /home/docker/nginx/conf/nginx.conf:/etc/nginx/nginx.conf \
-p 9000:80 \
nginx:1.20.0

三、部署Keepalived

1、获取镜像

docker pull osixia/keepalived:2.0.20

osixia/keepalived DockerHubDocker Hub

osixia/keepalived GitHubGitHub - osixia/docker-keepalived: Keepalived container image

2、查看服务器网关

ifconfig

netstat -rn

cat /etc/sysconfig/network-scripts/ifcfg-eth160

3、启动容器

docker run --cap-add=NET_ADMIN --cap-add=NET_BROADCAST --cap-add=NET_RAW --net=host -d --name keepalived \
    -v /etc/localtime:/etc/localtime \
    -e KEEPALIVED_INTERFACE='ens160' \
    -e KEEPALIVED_PASSWORD='d0cker' \
    -e KEEPALIVED_STATE='BACKUP' \
    -e KEEPALIVED_ROUTER_ID='51' \
    -e KEEPALIVED_UNICAST_PEERS="#PYTHON2BASH:['10.100.1.123','10.100.1.125']" \
    -e KEEPALIVED_VIRTUAL_IPS='10.100.1.155' \
    osixia/keepalived:2.0.20

四、Nginx状态监听脚本

#!/bin/bash
#检测nginx是否启动了
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ];then    #如果nginx没有启动就启动nginx                        
      docker restart nginx                #重启nginx
	  sleep 5
      if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ];then    #nginx重启失败则停掉keepalived服务进行VIP转移
              docker stop keepalived                    
      fi
fi

Nginx状态监听脚本添加关闭Keepalived的命令Nginx出现问题时能正常完成主备切换

五、验证服务

访问虚拟IP

关停 10.100.1.123 服务器的 Keepalived再次访问

修复 10.100.1.123 服务器的 Keepalived并一同重启 10.100.1.125 服务器的 Keepalived。

相关学习链接

keepalived高可用私网 - 知乎

VRRP协议详解 - 知乎

进入容器的keepalived目录下

/container/service/keepalived/assets

keepalived.conf

global_defs {
  default_interface enp160
}
vrrp_script check_nginx {
  script "/container/service/keepalived/assets/check_nginx.sh" #检测脚本文件
  interval 3           #检测时间间隔
  weight -10           #权重
}
vrrp_instance VI_1 {
  interface enp160     #设置实例绑定的网卡
  state BACKUP         #设置实例初始状态实际的MASTER和BACKUP是选举决定的
  virtual_router_id 51 #同一实例下virtual_router_id必须相同
  priority 120         #设置优先级优先级高的会被竞选为Master
  nopreempt            #非抢占模式
  unicast_peer {       #单播模式设置对端ip
    10.100.1.123
  }
  virtual_ipaddress {  #设置VIP可以设置多个
    10.100.1.155
  }
  authentication {     #设置认证
    auth_type PASS     #认证方式支持PASS和AH
    auth_pass d0cker   #认证密码
  }
  track_script {       #设置追踪脚本
    check_nginx
  }
  notify "/container/service/keepalived/assets/notify.sh"
}

阿里云国内75折回扣微信号：monov8

阿里云国际，腾讯云国际，低至75折。AWS 93折免费开户实名账号代冲值优惠多多微信号：monov8 飞机：@monov6