nginx+keepalived构建高可用服务

1.整体环境规划

虚拟IP：10.0.4.248

主Nginx：10.0.4.249

备用Nginx：10.0.4.250

2.keepalived安装

#cd /usr/local/src
#wget http://www.keepalived.org/software/keepalived-1.2.22.tar.gz
#./configure --prefix=/usr/local/keepalived
#make & make install

3.master服务keepalived.conf配置

! Configuration File for keepalived

global_defs {

 router_id edu-proxy-

}

vrrp_script chk_nginx {

 script "/etc/keepalived/nginx_check.sh"

 interval 

 weight -

}

vrrp_instance VI_1 {

 state MASTER

 interface eth0

 virtual_router_id 

 mcast_src_ip 10.0.4.249

 priority 

 nopreempt

 advert_int 

 authentication {

 auth_type PASS

 auth_pass 

 }

 track_script {

 chk_nginx 

}

 virtual_ipaddress {

 10.0.4.248

 }

}

4.backerup服务keepalived.conf配置

! Configuration File for keepalived

global_defs {

 router_id edu-proxy-

}

vrrp_script chk_nginx {

 script "/etc/keepalived/nginx_check.sh"

 interval 

 weight -

}

vrrp_instance VI_1 {

 state BACKUP

 interface eth0

 virtual_router_id 

 mcast_src_ip 10.0.4.250

 priority 

 advert_int 

 authentication {

 auth_type PASS

 auth_pass 

 }

 track_script {

 chk_nginx 

}

 virtual_ipaddress {

 10.0.4.248

 }

}

5.nginx_check.sh脚本编写

 

#!/bin/bash 

A=`ps -C nginx –no-header |wc -l`

if [ $A -eq  ];then

 /usr/local/openrestry/nginx/sbin/nginx //Nginx安装路径

 sleep 

 if [ `ps -C nginx --no-header |wc -l` -eq  ];then

 killall keepalived

 fi

fi

6.启动keepalived

主

/usr/local/keepalived/sbin/keepalived

[root@localhost sbin]# ip addr

: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN 

link/loopback ::::: brd :::::

 inet 127.0.0.1/ scope host lo

 inet6 ::/ scope host 

valid_lft forever preferred_lft forever

: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP qlen 

 link/ether :0c::c6:9b: brd ff:ff:ff:ff:ff:ff

 inet 10.0.4.249/ brd 10.0.4.255 scope global eth0

 inet 10.0.4.248/ scope global eth0

 inet6 fe80::20c:29ff:fec6:9b91/ scope link 

valid_lft forever preferred_lft forever

 

备用

[root@localhost keepalived]# ip addr

: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN 

link/loopback ::::: brd :::::

 inet 127.0.0.1/ scope host lo

 inet6 ::/ scope host 

valid_lft forever preferred_lft forever

: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP qlen 

 link/ether :0c:::6c: brd ff:ff:ff:ff:ff:ff

 inet 10.0.4.250/ brd 10.0.4.255 scope global eth0

 inet 10.0.4.248/ scope global eth0

 inet6 fe80::20c:29ff:fe75:6c82/ scope link 

valid_lft forever preferred_lft forever