2.1.增加配置
master
auto-increment-increment = 2
auto-increment-offset = 1
auto-increment-increment = 2
auto-increment-offset = 2
1.下載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是否搶佔
ip addr show dev ens160
keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MASTER-HA
}
vrrp_script chk_mysql_port { #檢測mysql服務是否在運行。有很多方式,比如進程,用腳本檢測等等
script "/opt/chk_mysql.sh" #這裏通過腳本監測
interval 2 #腳本執行間隔,每2s檢測一次
weight -5 #腳本結果導致的優先級變更,檢測失敗(腳本返回非0)則優先級 -5
fall 2 #檢測連續2次失敗纔算確定是真失敗。會用weight減少優先級(1-255之間)
rise 1 #檢測1次成功就算成功。但不修改優先級
}
vrrp_instance VI_1 {
state BACKUP
interface ens160 #指定虛擬ip的網卡接口
mcast_src_ip xxxxx
virtual_router_id 51 #路由器標識,MASTER和BACKUP必須是一致的
priority 101 #定義優先級,數字越大,優先級越高,在同一個vrrp_instance下,MASTER的優先級必須大於BACKUP的優先級。這樣MASTER故障恢復後,就可以將VIP資源再次搶回來
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
xxxxxx 沒有被分配的ip
}
track_script {
chk_mysql_port
}
}
非搶佔模式
! Configuration File for keepalived
global_defs {
router_id HA_MySQL
}
vrrp_script chk_mysql_port { #檢測mysql服務是否在運行。有很多方式,比如進程,用腳本檢測等等
script "/opt/keepalived_check_mysql.sh" #這裏通過腳本監測
interval 2 #腳本執行間隔,每2s檢測一次
weight -5 #腳本結果導致的優先級變更,檢測失敗(腳本返回非0)則優先級 -5
fall 2 #檢測連續2次失敗纔算確定是真失敗。會用weight減少優先級(1-255之間)
rise 1
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP #指定主服務器節點爲主節點,備用節點上設置需一致
interface ens160 #指定虛擬IP的網絡接口
virtual_router_id 88 #VRRP組名,兩個節點的設置必須一樣,以指明各個節點屬於同一VRRP組
priority 90 #主節點的優先級(1-254之間),備用節點必須比主節點優先級低。
advert_int 1 #組播信息發送間隔,兩個節點設置必須一樣
nopreempt
authentication { #設置驗證信息,兩個節點必須一致
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 { #檢測mysql服務是否在運行。有很多方式,比如進程,用腳本檢測等等
script "/opt/keepalived_check_mysql.sh" #這裏通過腳本監測
interval 2 #腳本執行間隔,每2s檢測一次
weight -5
fall 2
rise 1
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP #指定主服務器節點爲主節點,備用節點上設置需一致
interface ens160 #指定虛擬IP的網絡接口
virtual_router_id 88 #VRRP組名,兩個節點的設置必須一樣,以指明各個節點屬於同一VRRP組
priority 100 #主節點的優先級(1-254之間),備用節點必須比主節點優先級低。
advert_int 1 #組播信息發送間隔,兩個節點設置必須一樣
nopreempt
authentication { #設置驗證信息,兩個節點必須一致
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