Keeplived配置Nginx双机高可用
一、简介不管是Keepalived还是Heartbeat做高可用，其高可用，都是站在服务器脚本去说的高可用，而不是服务的角度。
也就是说，如果服务器DOWN机或者网络出现故障，高可用是可以实现自动切换的。如果运行的服务，比如Nginx挂掉
这些高可用软件是意识不到的，需要自己写脚本去实现服务的切换。
二、安装配置Keepalived
复制内容到剪贴板代码:
# ./configure # make
# make install
# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
# cp /usr/local/sbin/keepalived /usr/bin/
# chkconfig --add keepalived
# mkdir /etc/keepalived/
# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
编辑MASTER的主配置文件(MASTER: 1.1.1.1)
复制内容到剪贴板代码:
# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/opt/monnginx.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass mdnginx
}
virtual_ipaddress {
1.1.1.100
}
track_script {
chk_nginx
}
}
编辑BACKUP的主配置文件（BACKUP:1.1.1.2）
复制内容到剪贴板代码:
# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script "/opt/monnginx.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass mdnginx
}
virtual_ipaddress {
1.1.1.100
}
track_script {
chk_nginx
}
}
三、启动服务与脚本编写（主机和备机都要执行）
复制内容到剪贴板代码:
# service nginx start # service keepalived start
编写监控Nginx的脚本
复制内容到剪贴板代码:
# vim /opt/monnginx.sh #!/bin/bash
# author: honway.liu
# date: 2013-03-15
if [ $(ps -C nginx --no-header | wc -l) -eq 0 ]; then
service nginx start
fi
sleep 3
if [ $(ps -C nginx --no-header | wc -l) -eq 0 ]; then
service keepalived stop
fi
改进脚本，加上报警功能。
复制内容到剪贴板代码:
# vim /opt/monnginx.sh #!/bin/bash
# author: honway.liu
# date: 2013-03-15
IPADDR=$(ip addr show eth0|awk '{print $2}' | sed -n 3p)
contact=(137XXXXXXXX@139.com)
num=${#contact[@]}
function email() {
for ((i=0;i
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