Nginx-高可用keepalived

一、准备

系统	CentOS 7.9（192.168.91.128/192.168.91.129）
Nginx	nginx-1.20.2.tar.gz
keepalived

二、安装

1、Nginx安装

        192.168.91.128/192.168.91.129两台虚拟机都分别安装。

        Nginx-安装、配置_蚂蚁兄弟的博客-优快云博客

2、keepalived安装

        192.168.91.128/192.168.91.129两台虚拟机都分别安装。

2.1 执行安装

[root@node01 sbin]# yum install -y keepalived

2.2 检查安装

[root@node01 ~]# rpm -q -q keepalived
keepalived-1.3.5-19.el7.x86_64

三、配置

1、配置keepalived.conf

[root@node01 ~]# cd /etc/keepalived
[root@node01 keepalived]# cp keepalived.conf keepalived.conf.bak
[root@node01 keepalived]# rm -rf keepalived.conf
[root@node01 keepalived]# vi keepalived.conf

主节点添加如下内容

global_defs {
        notification_email {
                acassen@firewall.loc
                failover@firewall.loc
                sysadmin@firewall.loc
        }
        notification_email_from Alexandre.Cassen@firewall.loc
        smtp_server 192.168.91.128
        smtp_connect_timeout 30
        router_id LVS_DEVEL
}

vrrp_script chk_http_port {
        script "/usr/local/src/nginx_check.sh"
        interval 2 #（检测脚本执行的间隔）
        weight 2
}

vrrp_instance VI_1 {
        state MASTER # 备份服务器上将 MASTER 改为 BACKUP
        interface ens33 //网卡
        virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同
        priority 90 # 主、备机取不同的优先级，主机值较大，备份机值较小
        advert_int 1
        authentication {
                auth_type PASS
                auth_pass 1111
        }
        virtual_ipaddress {
                192.168.91.50 // VRRP H 虚拟地址
        }
}

从节点添加如下内容

global_defs {
        notification_email {
                acassen@firewall.loc
                failover@firewall.loc
                sysadmin@firewall.loc
        }
        notification_email_from Alexandre.Cassen@firewall.loc
        smtp_server 192.168.91.129
        smtp_connect_timeout 30
        router_id LVS_DEVEL
}

vrrp_script chk_http_port {
        script "/usr/local/src/nginx_check.sh"
        interval 2 #（检测脚本执行的间隔）
        weight 2
}

vrrp_instance VI_1 {
        state BACKUP # 备份服务器上将 MASTER 改为 BACKUP
        interface ens33 //网卡
        virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同
        priority 30 # 主、备机取不同的优先级，主机值较大，备份机值较小
        advert_int 1
        authentication {
                auth_type PASS
                auth_pass 1111
        }
        virtual_ipaddress {
                192.168.91.50 // VRRP H 虚拟地址
        }
}

2、添加配置

[root@node01 src]# vi nginx_check.sh

两台虚拟机分别添加如下内容

#!/bin/bash
A=`ps -C nginx – no-header |wc -l`
if [ $A -eq 0 ];then
        /usr/local/nginx/sbin/nginx
        sleep 2
        if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
                killall keepalived
        fi
fi

3、重启

分别重启两台虚拟机的nginx、keepalived

[root@node01 src]# systemctl restart nginx.service
[root@node01 src]# systemctl restart keepalived.service

 

四、测试

分别停掉其中一台虚拟机的nginx、keepalived。然后访问http://192.168.91.50，查看页面是否正常访问。