2.1.增加配置
master
auto-increment-increment = 2
auto-increment-offset = 1
auto-increment-increment = 2
auto-increment-offset = 2
1.下载keepalived
http://www.keepalived.org/software/keepalived-1.4.2.tar.gz
yum -y install openssl openssl-devel
yum -y install libnl libnl-devel
yum install -y libnfnetlink-devel
./configure --prefix=/usr/local/keepalived
make
make install
cp keepalived/etc/init.d/keepalived /etc/init.d/
cp keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp sbin/keepalived /usr/sbin/
查看vip是否抢占
ip addr show dev ens160
keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
xxx@xxx.cn
}
notification_email_from ops@wangshibo.cn
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MASTER-HA
}
vrrp_script chk_mysql_port { #检测mysql服务是否在运行。有很多方式，比如进程，用脚本检测等等
script "/opt/chk_mysql.sh" #这里通过脚本监测
interval 2 #脚本执行间隔，每2s检测一次
weight -5 #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5
fall 2 #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）
rise 1 #检测1次成功就算成功。但不修改优先级
}
vrrp_instance VI_1 {
state BACKUP
interface ens160 #指定虚拟ip的网卡接口
mcast_src_ip xxxxx
virtual_router_id 51 #路由器标识，MASTER和BACKUP必须是一致的
priority 101 #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级。这样MASTER故障恢复后，就可以将VIP资源再次抢回来
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
xxxxxx 没有被分配的ip
}
track_script {
chk_mysql_port
}
}
非抢占模式
! Configuration File for keepalived
global_defs {
router_id HA_MySQL
}
vrrp_script chk_mysql_port { #检测mysql服务是否在运行。有很多方式，比如进程，用脚本检测等等
script "/opt/keepalived_check_mysql.sh" #这里通过脚本监测
interval 2 #脚本执行间隔，每2s检测一次
weight -5 #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5
fall 2 #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）
rise 1
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP #指定主服务器节点为主节点，备用节点上设置需一致
interface ens160 #指定虚拟IP的网络接口
virtual_router_id 88 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
priority 90 #主节点的优先级（1-254之间），备用节点必须比主节点优先级低。
advert_int 1 #组播信息发送间隔，两个节点设置必须一样
nopreempt
authentication { #设置验证信息，两个节点必须一致
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.3.10
}
track_script {
chk_mysql_port
}
}
! Configuration File for keepalived
global_defs {
router_id HA_MySQL
}
vrrp_script chk_mysql_port { #检测mysql服务是否在运行。有很多方式，比如进程，用脚本检测等等
script "/opt/keepalived_check_mysql.sh" #这里通过脚本监测
interval 2 #脚本执行间隔，每2s检测一次
weight -5
fall 2
rise 1
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP #指定主服务器节点为主节点，备用节点上设置需一致
interface ens160 #指定虚拟IP的网络接口
virtual_router_id 88 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
priority 100 #主节点的优先级（1-254之间），备用节点必须比主节点优先级低。
advert_int 1 #组播信息发送间隔，两个节点设置必须一样
nopreempt
authentication { #设置验证信息，两个节点必须一致
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.3.10
}
track_script {
chk_mysql_port
}
}
keepalived_check_mysql.sh
#!/bin/bash
MYSQL=/usr/local/mysql/bin/mysql
MYSQL_HOST=localhost
MYSQL_USER=root
MYSQL_PASSWORD=123456
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
pkill -9 keepalived
exit 1
fi
sleep 1
Done
