high availability master keepalive + mysql replication from

Installation keepalive

 

Installation depends plugin:

yum install -y gcc openssl-devel popt-devel

wget -q http://www.keepalived.org/software/keepalived-1.2.13.tar.gz
tar -zxvf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./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/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
chkconfig --add keepalived
chkconfig --level 345 keepalived on

 

Configured on the master host

 

CAT / etc / keepalived / keepalived.conf 

vrrp_script chk_mysql_port {# detect mysql service is running. There are many ways, such as process, script testing, etc. 
    Script " / opt / chk_mysql.sh" # script here by monitoring 
    interval The 2                    # script execution interval, tested once every 2s 
    weight - 5                     # result script priority change detection failure (non-script returns 0), the priority - . 5 
    Fall 2                     # 2 successive detection failure is considered to determine the true failure. Priority will be reduced by weight ( 1 - between 255) 
    Rise 1                     # 1 Detection successful even if successful. But does not modify the priority 
} 
vrrp_instance VI_1 { 
    State the MASTER 
    interface ens33 # ip of the specified virtual network interface, not necessarily according to ifconfig eth0 determined 
    virtual_router_id 51 is # router identification, the MASTER and BACKUP must be consistent 
    priority 100 # define the priority, the larger the number, the higher the priority, the same next vrrp_instance, MASTER priority must be higher than the priority of BACKUP. MASTER recovery after such a failure, you can once again win back the VIP resource 
    advert_int 1 
    authentication { 
        AUTH_TYPE PASS 
        AUTH_PASS 123456 
    } 
    virtual_ipaddress { 
        192.168 . 11.25 
    } 
    track_script { 
       chk_mysql_port 
    } 
}

 

Configured on the slave

cat /etc/keepalived/keepalived.conf

vrrp_script chk_mysql_port {     
    script "/opt/chk_mysql.sh"
    interval 2
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.11.25
    }
    track_script {
       chk_mysql_port
    }
}

Detection script configuration

 

cat /opt/chk_mysql.sh

#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l)
if [ "${counter}" -eq 0 ]
then
   ## /etc/init.d/keepalived stop
service keepalived stop
else
   echo "running..." >> /opt/keepalived-running-info.log
   sleep 5000
fi

 

# Executed on the master and Slave 
sudo / etc / init.d / keepalived Start

service keepalived start //keepalived启动

service keepalived stop //keepalive 停止