Mysql主从配置（一台机器）

（1）源码安装mysql主

cd /usr/local/

wget [http://mirrors.sohu.com/mysql/MySQL-5.1/mysql-5.1.73-linux-i686-glibc23.tar.gz](http://mirrors.sohu.com/mysql/MySQL-5.1/mysql-5.1.73-linux-i686-glibc23.tar.gz)

mkdir /usr/local/mysql

tar -zxvf [mysql-5.1.73-linux-i686-glibc23.tar.gz](http://mirrors.sohu.com/mysql/MySQL-5.1/mysql-5.1.73-linux-i686-glibc23.tar.gz)


mv /usr/local/src/mysql-5.1.73-linux-i686-glibc23/* /usr/local/mysql

useradd -s /sbin/nologin mysql

mkdir -p /data/mysql

chown mysql:mysql /data/mysql

cd /usr/local/mysql

./scripts/mysql_install_db --user=mysql --datadir=/data/mysql

cp /usr/local/mysql/support-files/my-medium.cnf /etc/my.cnf

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

vim /etc/init.d/mysqld

找到basedir和datadir修改如下：

                 basedir=/usr/local/mysql/

                 datadir=/data/mysql/

vim /etc/profile

export PATH=$PATH:/usr/local/mysql/bin

source /etc/profile

（2）配置mysql主

vim /etc/my.cnf
        server-id=1
        log-bin= mysql-binlog
                binlog-do-db=db1
mysql -uroot -S /tmp/mysql.sock
                create database db1
                use db1
                create table lk
                grant replication slave on *.* to 'repl'@'127.0.0.1' identified by '123456';
                show master status;#记住file和position
                flush tables with read lock;
mysqldump -uroot -S /tmp/mysql.sock db1 > db1.sql
然后在主mysql上解read only锁
mysql -uroot -S /tmp/mysql.sock -e "unlock tables"

（3）源码安装mysql从

cd /usr/local
cp -r mysql mysql2
cd mysql2
./scripts/mysql_install_db --user=mysql --datadir=/data/mysql2
cp /etc/my.cnf ./my.cnf

（4）配置mysql从

vim my.cnf
    更改 port 为 3307 以及 socket 为/tmp/mysql2.sock
        port            = 3307
        socket          = /tmp/mysql2.sock
        [mysqld]
        port            = 3307
        socket          = /tmp/mysql2.sock

        server-id不能和主的重复
          server-id       = 2
          relay-log= mysql-relay-bin
       
        这一步非常重要，不然第二个mysql会不能启动  

                basedir=/usr/local/mysql2/

                datadir=/data/mysql2/

导入数据库保证主从一致
mysql -uroot -S /tmp/mysql2.sock
        create database db1;
mysql -uroot -S /tmp/mysql2.sock db1 < db1.sql


mysql -uroot -S /tmp/mysql2.sock
        slave stop;
        change master to master_host='127.0.0.1',master_port=3306,master_user='repl',master_password='123456', master_log_file='mysql-bin.000002', master_log_pos=282;
        slave start;
        show slave status\G
                Slave_IO_Running: Yes
                Slave_SQL_Running: Yes

（5）测试主从

mysql -uroot -S /tmp/mysql2.sock
        use db1;
        show tables;

mysql -uroot -S /tmp/mysql.sock
        use db1
        drop table lk
        create table wr;
        create database bbb;

mysql -uroot -S /tmp/mysql2.sock
        use db1
        show tables;
        show databases;

可以看到已经同步了删除了表lk，创建了表wr，但是database bbb是没有同步的，因为我们只设置了要同步db1