mysql keepalived 双机热备,keepalived+Nginx+mysql做双机热备
Nginx+mysql的安装网上多的是，mysql互备等，这里就不写了。
nginx1:192.168.6.155
nginx2:192.168.2.156
最新的1.2.3安装过程有错误 找不到解决方法 就下了个1.2.2的
1.安装配置Keepalived下载所需要的软件
wget http://keepalived.org/software/keepalived-1.2.2.tar.gz
wget http://rpm5.org/files/popt/popt-1.16.tar.gz
2.安装popt
编译keepalived时需要popt，否则会报以下错误：configure: error: Popt libraries is required
tar -zxvf popt-1.16.tar.gz
cd popt-1.16
./configure
make
make install
3.安装keepalived
tar -zxvf keepalived-1.2.2.tar.gz
cd keepalived-1.2.2
./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-194.8.1.el5-i686/
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/sbin/
4.修改配置文件为以下内容:
vim /usr/local/keepalived/etc/keepalived/keepalived.conf
主站服务器
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
script "/root/shell/monitor_nginx.sh" #根据自己的实际路径放置monitor_nginx.sh 也可添加多一个check_mysql.sh检测mysql
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 1234
}
track_script {
Monitor_Nginx
}
virtual_ipaddress {
192.168.6.133
}
}
注:备机的keepalived的安装和上面一样，只要把配置文件改为以下(把MASTER改为BACKUP)
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
script "/root/scripts/monitor_nginx.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP #改为BACKUP
interface eth0
virtual_router_id 51
priority 30 #比MASTER数值要低
advert_int 1
authentication {
auth_type PASS
auth_pass 1234
}
track_script {
Monitor_Nginx
}
virtual_ipaddress {
192.168.6.133
}
}
注：monitor_nginx.sh为监控nginx进程的脚本,内容如下
#!/bin/bash
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
/usr/local/nginx/sbin/nginx
sleep 5
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
killall keepalived
fi
fi
mysql状态检测脚本/root/shell/keepalived_check_mysql.sh
vim /root/shell/keepalived_check_mysql.sh
#!/bin/bash
MYSQL=/usr/local/mysql/bin/mysql
MYSQL_HOST=localhost
MYSQL_USER=root
MYSQL_PASSWORD=9ai9.net
CHECK_TIME=3
#mysql is working MYSQL_OK is 1 , mysql down MYSQL_OK is 0
MYSQL_OK=1
function check_mysql_helth (){
$MYSQL -h $MYSQL_HOST -u $MYSQL_USER -p${MYSQL_PASSWORD} -e "show status;" >/dev/null 2>&1
if [ $? = 0 ] ;then
MYSQL_OK=1
else
MYSQL_OK=0
fi
return $MYSQL_OK
}
while [ $CHECK_TIME -ne 0 ]
do
let "CHECK_TIME -= 1"
check_mysql_helth
if [ $MYSQL_OK = 1 ] ; then
CHECK_TIME=0
exit 0
fi
if [ $MYSQL_OK -eq 0 ] && [ $CHECK_TIME -eq 0 ]
then
/etc/init.d/keepalived stop
exit 1
fi
sleep 1
done
赋予执行权限
chmod 755 /root/shell/keepalived_check_mysql.sh
monitor_nginx.sh也一样需要赋予执行权限
5.启动keepalived
/usr/local/keepalived/sbin/keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf
或者用service keepalived start来启动 service keepalived status来查看状态
用这种 /etc/rc.d/init.d/keepalived start方式来启动有问题 不知道为什么
测试步骤
1． 访问VIP看是否能够正常访问后端的tomcat
2． 停止其中一个tomcat看是否能将访问转到另一台上
3． 停止两台nginx上任何一个nginx进程看监控进程脚本是否会自动启动nginx
4． 停止任何一台nginx上的keepalived进程看另一台是否接管vip
比如停止Master上的keepalived,例如如下killall keepalived,查看BACKUP机器是否已经接管，如果BACKUP接管后，BACKUP机器日志会是出下情况
eth0: mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:03:9f:88 brd ff:ff:ff:ff:ff:ff
inet 192.168.6.155/24 brd 192.168.6.255 scope global eth0
inet 192.168.6.133/32 scope global eth0 inet6 fe80::20c:29ff:fe03:9f88/64 scope link
valid_lft forever preferred_lft forever
注意：
vrrp协议 使用224.0.0.18地址组播 需要添加到防火墙 以为centos为例：
-A RH-Firewall-1-INPUT -d 224.0.0.18 -j ACCEPT
(责任编辑：ken)