高可用mysql (主主复制)

最近要做个高可用的mysql。用mysql主主复制方式保证两台数据库的数据一致。结合lvs和keepalived一起使用(keepalived+lvs的设置会再另外一篇文章里写)。

搭好环境之后,本人做了以下测试并得到测试结果:

=======================测试步骤===========================

A机:活跃机器(主机)

B机:(备机)

1 在A上写数据,检查A ,B 两机的数据是否同步(test ok)

2 在B上写数据,检查A ,B 两机的数据是否同步(test ok)

3 A关闭数据库,在B上写数据

4 A启动数据库,检查A,B数据是否同步(test ok)

5 分别在A 和 B 上写数据,检查数据同步(test ok)

6 B关闭数据库,在A上写数据,检查数据同步(test ok)

7 B启动数据库,检查数据同步(test ok)

8 分别在A 和 B 上写数据,检查数据同步(test ok)

9 先关闭A机,然后写数据,再关闭B机,然后先启动A机,此时A机的数据没有与B同步。然后启动B机,过一下,B机后来写的数据同步到了A机。(test ok )

10 关闭A机,然后写数据。关闭B机,启动A机,然后写数据,启动B机,数据同步有错,会有主键冲突情况(test failed

 Last_Error: Error 'Duplicate entry '16' for key 'PRIMARY'' on query. Default database: 'radius'. Query: 'INSERT INTO radacct(ACCTSESSIONID,ACCTUNIQUEID,USERNAME,REALM,NASIPADDRESS,NASPORTID, NASPORTTYPE,
 acctstarttime, ACCTSTOPTIME,acctsessiontime,acctauthentic,connectinfo_start,CONNECTINFO_STOP,acctinputoctets, acctoutputoctets,
calledstationid, callingstationid, ACCTTERMINATECAUSE,servicetype,   framedprotocol,    framedipaddress,  acctstartdelay,acctstopdelay,accuniqueid)
VALUES('80804e49','0004707ab5d434a1','10.245.151.52','','192.168.12.1','2155892297','Wireless-802.11','2012-08-06
10:45:53','2012-08-06 11:11:45',1491,'','','',3211227,23921543,'hotspot1','64:A0:E7:C9:1A:A9','Idle-
Timeout','','','10.245.151.52',0,0,'0000000000')'


该问题的最好解决办法是保证两台数据库表的primary key 不会出现重复。也可以按下面的方法手工处理或者忽略该错误。


参考文章:

http://google3030.blog.163.com/blog/static/16172446520104282594532/

http://blog.163.com/yaning_softwo/blog/static/378377212011310115526121/

解决方法:
一、如果较少的错误可以手动解决

mysql -uroot -proot123 -e "stop slave;SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1;start slave;"

slave stop;
set global sql_slave_skip_counter=n; \\ n=正整数,,看你的错误有几条,就跳过几条  
slave start;

二、较多的情况下增加slave_skip_errors = 1062 参数

my.cnf 中增加slave_skip_errors = 1062 参数,忽略1062错误,若忽略多个错误,中间用逗号隔开,忽略所有用all

===================以下是设置================================

参考文章:

http://www.mike.org.cn/articles/mysql-master-slave-sync-conf-detail/

 最终整理为一个mysqld.sh 脚本,红色部分根据实际情况修改

执行步骤为:

1 在两台数据库 先执行 sh mysqld.sh  init_slave

2 在两台数据库 执行 sh mysqld.sh  set_slave

========shell======

#!/bin/sh
source /root/.bash_profile

MYSQL_DIR=/usr/local/mysql
DEFAULTSET=/etc/my.cnf

MYSQL=`which mysql`
USER=root
PASSWD=root123
SERVER_ID=1
PEER_HOST_IP=192.168.4.191
PEER_USER=mysql
PEER_PASSWD=mysql123


start()
{
cd $MYSQL_DIR
        PID=`pidof mysqld`
        if [ "$PID" == "" ];then
                 #MYSQL_SAFE=`which mysqld_safe`
                ./bin/mysqld_safe --defaults-file=$DEFAULTSET & >/dev/null
                sleep 5;
        fi
        PID=`pidof mysqld`
        if [ "$PID" != "" ];then
                sh /sh_dir/keepalived.sh restart
        fi
}

stop()
{
cd $MYSQL_DIR
    ./bin/mysqladmin -uroot -proot123 shutdown
}


restart()
{
    stop

    sleep 5

    start
}

help()
{
    echo "usage: start | stop | restart | show"
    echo "init_slave---> add slave config"
    echo "set_slave----> set slave"
    echo "slave_skip---> skip one count when primary key conflict"
    echo "show_m -------> show master info"
    echo "show_s -------> show slave info"

}


show()
{
    ps -ef |grep mysqld
}

init_slave_conf()
{
  echo "" >>/etc/my.cnf
  echo "#slave" >>/etc/my.cnf
  echo "server-id=$SERVER_ID" >>/etc/my.cnf
  echo "binlog-do-db=radius" >>/etc/my.cnf
  echo "binlog-ignore-db=mysql,test,information_schema,performance_schema" >>/etc/my.cnf
  echo "slave_skip_errors=1062" >>/etc/my.cnf ####根据实际情况设置是否需要忽略改错误
  /sh_dir/mysqld.sh restart
sleep 8
$MYSQL -u$USER -p$PASSWD -e "grant all on *.* to root@'$PEER_HOST_IP' identified by 'root123'";
$MYSQL -u$USER -p$PASSWD -e "grant all on *.* to $PEER_USER@'$PEER_HOST_IP' identified by '$PEER_PASSWD'";
$MYSQL -u$USER -p$PASSWD -e "flush privileges;";
}

slave_set()
{
        $MYSQL -u$USER -p$PASSWD -e "grant all on radius.* to mysql@'%' identified by 'mysql123'";
        PEER_MASTER=/tmp/masterinfo.log
        $MYSQL -h $PEER_HOST_IP -u$USER -p$PASSWD -s -r -N -e "show master status;" >$PEER_MASTER
        BIN_NAME=`cat $PEER_MASTER | awk '{print $1}'`
        BIN_POS=`cat $PEER_MASTER | awk '{print $2}'`
        DB_NAME=`cat $PEER_MASTER | awk '{print $3}'`

        echo $BIN_NAME $BIN_POS $DB_NAME

        SLAVE_SET="change master to

        master_host='$PEER_HOST_IP',master_user='$PEER_USER',master_password='$PEER_PASSWD',master_log_file='$BIN_NAME',master_log_pos=$BIN_POS;"

        echo $SLAVE_SET

        $MYSQL -u$USER -p$PASSWD  -e "stop slave;use $DB_NAME;$SLAVE_SET;start slave;show slave status\G"
}

slave_skip()
{
        SKIP_COUNT=1
        $MYSQL -u$USER -p$PASSWD  -e "stop slave;SET GLOBAL SQL_SLAVE_SKIP_COUNTER=$SKIP_COUNT;start slave;"
}

show_master()
{
 $MYSQL -u$USER -p$PASSWD  -e "show master status\G"
}

show_slave()
{
 $MYSQL -u$USER -p$PASSWD  -e "show slave status\G"
}

keepalived_check()
{
        PID=`/sbin/pidof mysqld`

        /usr/bin/wall "====mysql down pid:[$PID]===="

        if [ "$PID" == "" ];then
                $SHELL_DIR/keepalived.sh stop
        fi
}

case "$1" in
    start)
        start;;
    stop)
        stop;;
    restart)
        restart;;
    show)
        show;;
    init_slave)
        init_slave_conf;;
    set_slave)
         slave_set;;
    slave_skip)
        slave_skip;;
    show_m)
        show_master;;
    show_s)
        show_slave;;
    *)
        help;;
 esac

=================end==============================

 

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