keepalived+nginx

yum install -y keepalived
主从都需要check_nginx.sh
check_nginx.sh内容如下:
cat >/etc/keepalived/check_nginx.sh<<EOF
#!/bin/bash
counter=$(ps -C nginx --no-heading |wc -l)
if [ "${counter}" = "0" ];then
systemctl start nginx
sleep 2
counter=$(ps -C nginx --no-heading |wc -l)
if [ "${counter}" = "0" ];then
systemctl stop keepalived
fi
fi
EOF

chmod +x /etc/keepalived/check_nginx.sh

keepalived.conf master配置文件

cat >/etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived
#全局配置，路由ID,固定不变
global_defs {
router_id LVS_DEVEL
}
#定义nginx状态脚本
vrrp_script chk_nginx {
script "/etc/keepalived/check_nginx.sh"
interval 2
#权重，当脚本成功或失败对当前节点的优先级是增加还是减少
weight -5

}

vrrp_instance VI_1 {
#主节点
state MASTER
#ifconfig查看
interface ens33
#虚拟路由id,主从保证相同
virtual_router_id 51
#抢占模式，优先级高为主
priority 100
#心跳包
advert_int 2
authentication {
auth_type PASS
auth_pass 1111
}
#vip
virtual_ipaddress {
11.0.1.147
}
#指定nginx执行状态脚本
track_script {
chk_nginx
}
}

EOF
systemctl start keepalived

keepalived备份机配置
需要修改
state backup
priority 99
cat >/etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived
#全局配置，路由ID,固定不变
global_defs {
router_id LVS_DEVEL
}
#定义nginx状态脚本
vrrp_script chk_nginx {
script "/etc/keepalived/check_nginx.sh"
interval 2
#权重，当脚本成功或失败对当前节点的优先级是增加还是减少
weight -5

}

vrrp_instance VI_1 {
#主节点
state backup
#ifconfig查看
interface ens33
#虚拟路由id,主从保证相同
virtual_router_id 51
#抢占模式，优先级高为主
priority 99
#心跳包
advert_int 2
authentication {
auth_type PASS
auth_pass 1111
}
#vip
virtual_ipaddress {
11.0.1.147
}
#指定nginx执行状态脚本
track_script {
chk_nginx
}
}

EOF

systemctl start keepalived