keepalived对nginx高可用演练脚本

1、安装nginx、keepalived、epel-release源
yum install -y epel-release
yum install -y nginx
yum install -y keepalived

2、配置好nginx

3、设置keepalived配置文件
#主机
vi /etc/keepalived/keepalived.conf
vrrp_script chk_nginx {
script "/usr/local/nginx_pid.sh"
interval 2
fall 2       #测试失败的次数
rise 1     #测试成功的次数
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 5
authentication {
auth_type PASS
auth_pass eric
}
track_script {
chk_nginx
}
virtual_ipaddress {
192.168.14.206
}
}

#备机
vi /etc/keepalived/keepalived.conf
vrrp_script chk_nginx {
script "/usr/local/nginx_pid.sh"
interval 2
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 5
authentication {
auth_type PASS
auth_pass eric
}
track_script {
chk_nginx
}
virtual_ipaddress {
192.168.14.206
}
}

4、自备都建nginx_chk脚本
vi /opt/nginx_chk.sh
#!/bin/bash
# version 0.0.2
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then
/usr/local/nginx/sbin/nginx
sleep 3
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
killall keepalived                        ## 则结束 keepalived 进程
fi
fi

chmod +x  /opt/nginx_pid.sh

5、启动nginx和keepalived
/etc/init.d/nginx start
/etc/init.d/keepalived start

6、查看日志和ip
ip addr
tailf /var/log/messages

7、故障演练
killall nginx
tailf /var/log/messages  #查看两边的日志