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redis keepalived

主备Nginx

主Nginx（MASTER）备Nginx（BACKUP）

keepalived
虚拟IP
主Nginx（MASTER）IP
备Nginx（BACKUP）IP

安装keepalived

安装：yum install keepalived -y
测试是否安装成功：rpm -qa keepalived
配置文件：/etc/keepalived/keepalived.conf
日志存放位置：/var/log/messages

keepalived.conf结构

  1. global_defs {
  2.     notification_email {}
  3. }
  4. vrrp_script chk_http_port{}
  5. vrrp_instance VI_1 {
  6.      authentication {}
  7.      virtual_ipaddress {}
  8. }

keepalived.conf - 全局定义部分 global definition

  1. global_defs {
  2.     notification_email {
  3.     acassen@firewall.loc
  4.     failover@firewall.loc
  5.     sysadmin@firewall.loc
  6. }
  7. notification_email_from Alexandre.Cassen@firewall.loc
  8. smtp_server 192.168.200.1
  9. smtp_connect_timeout 30
  10. router_id LVS_DEVEL

router_id LVS_DEVEL
值可以是IP
在/etc/hosts中127.0.0.1 xxx
xxx就是这个id

keepalived.conf - 检测脚本 vrrp_script chk_http_port

  1. vrrp_script chk_http_port{
  2.         script "/user/local/src/nginx_check.sh"
  3.         interval 2
  4.         weight 2
  5. }

script 脚本地址
interval 2 脚本检测时间，2秒
weight 权重改变，当脚本中的条件成立，当前服务器权重-20

keepalived.conf - 虚拟IP vrrp_instance - 主MASTER

  1.  vrrp_instance VI_1 {
  2.      state MASTER
  3.      interface eth0
  4.      virtual_router_id 51
  5.      priority 100
  6.      advert_int 1
  7.      authentication {
  8.          auth_type PASS
  9.          auth_pass 1111
  10.      }
  11.      virtual_ipaddress {
  12.          192.168.200.16
  13.          192.168.200.17
  14.          192.168.200.18
  15.      }
  16.  }

state MASTER/BACKUP 主设备MASTER还是备设备BACKUP

interface ens33 网卡号
终端：ifconfig
第一行第一个英文单词

virtual_router_id 51 主设备和备设备id要相同

priority 100 优先级，主机值大，备机值小

advert_int 1 每隔一秒测试有没有活着

authentication 权限调用方式

virtual_ipaddress 虚拟IP地址

keepalived.conf - 虚拟IP vrrp_instance - 备BACKUP

  1.  vrrp_instance VI_1 {
  2.      state BACKUP
  3.      interface eth0
  4.      virtual_router_id 51
  5.      priority 90
  6.      advert_int 1
  7.      authentication {
  8.          auth_type PASS
  9.          auth_pass 1111
  10.      }
  11.      virtual_ipaddress {
  12.          192.168.200.16
  13.          192.168.200.17
  14.          192.168.200.18
  15.      }
  16.  }

state MASTER/BACKUP 主设备MASTER还是备设备BACKUP

interface ens33 网卡号
终端：ifconfig
第一行第一个英文单词

virtual_router_id 51 主设备和备设备id要相同

priority 100 优先级，主机值大，备机值小

advert_int 1 每隔一秒测试有没有活着

authentication 权限调用方式

virtual_ipaddress 虚拟IP地址

nginx_check.sh

/user/local/src/nginx_check.sh

  1. #!/bin/bash
  2. A=`ps -C nginx –no-header |wc -l`
  3. if [ $A -eq 0 ];then
  4.     /usr/local/nginx/sbin/nginx
  5.     sleep 2
  6.     if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
  7.         killall keepalived
  8.     fi
  9. fi

主备都启动Nginx

主备都启动keepalived

  1. systemctl start keepalived.service
  1. ps -ef | grep keepalived