keepalived和nginx的安装和使用

1、安装keepalived

   解压后  ./configure --prefix=/usr/local/keepalived

     make&&make install

2、拷贝设置

      mkdir /etc/keepalived

　　cp /soft/keepalived-1.4.2/keepalived/etc/init.d/keepalived /etc/init.d/

　　cp /soft/keepalived-1.4.2/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

　　cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

　　cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

    设置开机启动

　　chkconfig keepalived on

 

 配置主节点：编辑/etc/keepalived/keepalived.conf

global_defs {
#一个没重复的名字即可
router_id keep57
}

# 检测nginx是否运行
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh"
interval 2#权重减少20,减少完要比从机的值小
weight -20
}

vrrp_instance VI_1 {

# MASTER代表主机
state MASTER

# 网卡名字 ip addr 可以查看
interface ens33

# 同一个keepalived集群的virtual_router_id相同
virtual_router_id 57

# 权重，master要大于slave
priority 100

# 主备通讯时间间隔
advert_int 1

# 如果两节点的上联交换机禁用了组播，则采用vrrp单播通告的方式
# 本机ip
mcast_src_ip 192.168.1.57

# 设置nopreempt防止抢占资源
nopreempt

# 主备保持一致
authentication {
auth_type PASS
auth_pass 1111
}

# 与上方nginx运行状况检测呼应
track_script {
chk_nginx
}

virtual_ipaddress {
# 虚拟ip地址（VIP，一个尚未占用的内网ip即可）
192.168.1.111
}
}

从配置

global_defs {
#一个没重复的名字即可
router_id keep56
}

# 检测nginx是否运行
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh"
interval 2
weight -20
}

vrrp_instance VI_1 {

# 代表是从机
state BACKUP

# 网卡名字，ip addr获取
interface ens33

# 同一个keepalived集群的virtual_router_id相同
virtual_router_id 57

# 权重，master要大于slave
priority 90

# 主备通讯时间间隔
advert_int 1

# 如果两节点的上联交换机禁用了组播，则采用vrrp单播通告的方式
# 本机ip
mcast_src_ip 192.168.1.56

# 设置nopreempt防止抢占资源
nopreempt

# 主备保持一致
authentication {
auth_type PASS
auth_pass 1111
}

# 与上方nginx运行状况检测呼应
track_script {
chk_nginx
}

virtual_ipaddress {
# 虚拟ip地址（VIP，一个尚未占用的内网ip即可）
192.168.1.111
}
}

 文件/etc/keepalived/nginx_check.sh

 

#!/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

 

参考文献：https://www.cnblogs.com/yjc1605961523/p/12295051.html