Keepalived高可用Nginx

背景：

Keepalived高可用Nginx

实验拓扑：

1.在两台realserver上配置web服务

2.keepalived配置
master的配置
global_defs {
  notification_email {
      root@localhost
  }
  notification_email_from keepalived@localhost
  smtp_server 127.0.0.1
  smtp_connect_timeout 30
  router_id node1
}
 
vrrp_script chk_down {    #keepalived控制脚本       
    script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"      #脚本内容
    interval 2
    weight -6
}
 
vrrp_script chk_nginx {            #检测nginx服务脚本
    script "killall -0 nginx && exit 0 || exit 1"  #脚本内容     
    interval 2
    weight -6
}
 
vrrp_instance VI_1 {    #配置实例
    state MASTER
    interface eno16777736
    virtual_router_id 88
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
 
    virtual_ipaddress {
        10.1.88.88/16 dev eno16777736 label eno16777736:0
    }
 
    track_script {    #调用脚本
        chk_down
        chk_nginx
    }
 
    notify_master "/etc/keepalived/notify.sh master"    #定义通告脚本
    notify_backup "/etc/keepalived/notify.sh backup"   
    notify_fault  "/etc/keepalived/notify.sh fault"
}

backup的配置：

global_defs {
  notification_email {
      root@localhost
  }
  notification_email_from keepalived@localhost
  smtp_server 127.0.0.1
  smtp_connect_timeout 30
  router_id node1
}
 
vrrp_script chk_down {
    script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
    interval 2
    weight -6
}
 
vrrp_script chk_nginx {
    script "killall -0 nginx && exit 0 || exit 1"
    interval 2
    weight -6
}
 
vrrp_instance VI_1 {
    state BACKUP   
    interface eno16777736
    virtual_router_id 88
    priority 98
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
 
    virtual_ipaddress {
        10.1.88.88/16 dev eno16777736 label eno16777736:0
    }
 
    track_script {
        chk_down
        chk_nginx
    }
 
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault  "/etc/keepalived/notify.sh fault"
}

3.nginx调度器配置
两台nginx调度器的配置文件
#http段中的配置
http {
    include      /etc/nginx/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"';
 
    access_log  /var/log/nginx/access.log  main;
 
    sendfile        on;
    #tcp_nopush    on;
 
    keepalive_timeout  65;
 
    #gzip  on;
 
    include /etc/nginx/conf.d/*.conf;
 
    upstream webserver {
        server 10.1.68.5 weight=1 max_fails=2;
        server 10.1.68.6 weight=1 max_fails=2;
    }
 
    server {
        listen 80;
        server_name localhost;
 
        location / {
            index index.html index.htm;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_pass ;
        }
    }
 
}

在两台调度器上同时启动nginx和keepalived，此时VIP在nginx1主机上

4.测试

通过VIP访问，可正常调度

停止调度器1上面的nginx服务，VIP漂移至nginx2主机上

依然可以正常调度

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