keepalived 安装
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yum install kernel-devel
wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz
tar zxvf keepalived-1.2.1.tar.gz
cd keepalived-1.2.1
./configure --with-kernel-dir=/usr/src/kernels/2.6.18-308.13.1.el5-i686/
make
make install
mkdir /etc/keepalived --创建文件夹
vim /etc/keepalived/keepalived.conf
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################添加删除虚拟IP#############
ip addr del 192.168.1.198/32 dev eth0
ifconfig eth0:1 192.168.0.1 netmask 255.255.255.0
-------------------增加keepalived日志功能---------------
vim /usr/local/etc/sysconfig/keepalived
增加 KEEPALIVED_OPTIONS="-D -d -S 0"
-----增加 vim /etc/syslog.conf
# keepalived -S 0
local0.* /var/log/keepalived.log
重启一下 /etc/init.d/syslog restart
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相关配置文件：
192.168.1.100 192.168.1.101
100 上的 vim /etc/keepalived/keepalived.conf
---------------------------------------
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
# 20081013 written by :netseek
# VIP1
vrrp_instance VI_1 {
state MASTER #备份服务器上将MASTER改为BACKUP
interface eth0
virtual_router_id 51
priority 100 # 备份服务上将100改为99
advert_int 1
nopreempt #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.222
#(如果有多个VIP，继续换行填写.)
}
}
virtual_server 192.168.1.222 3306 {
delay_loop 3 #(每隔10秒查询realserver状态)
lb_algo wrr #(lvs 算法)
lb_kind DR #(Direct Route)
persistence_timeout 60 #(同一IP的连接60秒内被分配到同一台realserver)
protocol TCP #(用TCP协议检查realserver状态)
real_server 192.168.1.100 3306 {
weight 1 #(权重)
notify_down /usr/local/mysql/bin/mysql.sh #检测到服务down后执行的脚本
TCP_CHECK {
connect_timeout 10 #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
----------------------------------------------------------------------
102 上的 vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
# 20081013 written by :netseek
# VIP1
vrrp_instance VI_1 {
state MASTER #备份服务器上将MASTER改为BACKUP
interface eth0
virtual_router_id 51
priority 90 # 备份服务上将100改为99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.222
#(如果有多个VIP，继续换行填写.)
}
}
virtual_server 192.168.1.222 3306 {
delay_loop 3 #(每隔10秒查询realserver状态)
lb_algo wrr #(lvs 算法)
lb_kind DR #(Direct Route)
persistence_timeout 60 #(同一IP的连接60秒内被分配到同一台realserver)
protocol TCP #(用TCP协议检查realserver状态)
real_server 192.168.1.102 3306 {
weight 1 #(权重)
notify_down /usr/local/mysql/bin/mysql.sh #检测到服务down后执行的脚本
TCP_CHECK {
connect_timeout 10 #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
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vim /usr/local/mysql/bin/mysql.sh
#!/bin/sh
pkill keepalived
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测试：
1.先开启100 mysql服务，102 mysql 服务
2.keepalived -D -d -S 0
3.ip addr (100 和101 上都看看，100优先级高，就所以虚拟IP 一开始绑定在100 上)
4.100 service mysqld stop
5.查看 ip addr(ip 去了101上了)
6.100的mysql 服务再启动
7.ip addr
虚拟IP 又回来了
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