MySQL 主从双向复制实验

今天说的实验是MySQL主从双向复制，实验环境为Master（Red Hat Enterprise Linux Server release 5.5 IP: 192.168.0.225）Slave（CentOS release 6.2 (Final) IP：192.168.0.214）

废话不多说，直接写如何实验过程。

# cd /usr/local/src/mysql
# tar xzvf mysql-5.1.45.tar.gz
# groupadd mysql
# useradd -g mysql mysql
# cd mysql-5.1.45
#./configure --prefix=/usr/local/mysql --enable-local-infile --with-charset=utf8 --with-extra-charsets=all --enable-thread-safe-client --enable-assembler --with-unix-socket-path=/usr/local/mysql/tmp/mysql.sock --with-plugins=innobase
#make && make install

配置mysql

# cp support-files/my-medium.cnf /etc/my.cnf
# 修改 /etc.my.cnf 将skip-locking替换成skip-external-locking
# cd /usr/local/mysql
# bin/mysql_install_db --user=mysql
# mkdir tmp
# chown -R root .
# chown -R mysql var
# chown -R mysql tmp
# chgrp -R mysql .
# bin/mysqld_safe --user=mysql & //以mysql用户启动数据库。

同样步骤在slave机器上安装完毕mysql
———————————————————————————————————————————————————————————————————————————————————
master my.cnf配置文件

[root@defcon ~]# egrep -v '^$|^#' /etc/my.cnf
[client]
port = 3306
socket = /usr/local/mysql/tmp/mysql.sock
[mysqld]
port = 3306
socket = /usr/local/mysql/tmp/mysql.sock
skip-external-locking
key_buffer_size = 16M
max_allowed_packet = 1M
table_open_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
server-id= 1
master-host=192.168.0.214
master-user=shanker
master-password=1234
master-port=3306
master-connect-retry=60
replicate-do-db=testdba
log-bin
binlog-do-db=testdba
read-only=0
binlog-ignore-db=mysql

log-bin=mysql-bin
binlog_format=mixed
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout

slave的my.cnf配置内容

[root@shanker ~]# egrep -v '^$|^#' /etc/my.cnf
[client]
port = 3306
socket = /usr/local/mysql/tmp/mysql.sock
[mysqld]
port = 3306
socket = /usr/local/mysql/tmp/mysql.sock
skip-external-locking
key_buffer_size = 16M
max_allowed_packet = 1M
table_open_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
server-id=2
master-host=192.168.0.225
master-user=shanker
master-password=1234
master-port=3306
master-connect-retry=60
replicate-do-db=testdba
log-bin=/var/mysql/mysqllog
log-bin=mysql-bin
binlog_format=mixed
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
server-id=1
log-bin=/var/mysql/mysqllog
binlog-do-db=testdb
read-only=0
binlog-ignore-db=mysql

配置文件修改完毕保存该配置并且删掉 mysql 的 var 目录下除数据库以外的文件。
主要是 *.00000* 类似的文件以及 master.info ，为避免出错，一定要先删除。

为了方便我写了个脚本，用来删除那些文件

[root@shanker ~]# cat clearupvar
cd /usr/local/mysql/var
rm i* mysql-b* shanker* *.info

shanker是主机的名字

主机上：

# /usr/local/mysql/bin/mysql -uroot -p
mysql>create database testdb;
mysql>use testdb;
mysql>CREATE TABLE students(
sn INT,
name VARCHAR(20)
)
mysql> insert into students values(1,'shanker');

从机上：

/usr/local/mysql/bin/mysql -uroot  -p
mysql>create database testdb;
mysql>CREATE TABLE students(
sn INT,
name VARCHAR(20)
)
mysql> insert into students values(2,'defcon');

创建用于同步的用户并赋予其操作权限(主机从机都要执行)

# /usr/local/mysql/bin/mysql -uroot

mysql>GRANT REPLICATION SLAVE ON *.* TO 'shanker'@'%' IDENTIFIED BY '1234';


mysql>flush privileges

主机 master ：

mysql > show master status;

记住字段 file 和 position 的值，在 slave 状态中需要检验的。
从机 slave ：

mysql > show slave status\G;

特别提示：检查参数 Slave_IO_State 、 Slave_IO_Running 、 Slave_SQL_Running

Slave_IO_State 的状态值是由 Slave_IO_Running 的值决定的，如果

Slave_IO_Running 和 Slave_SQL_Running 的值都为 Yes ，并且

Slave_IO_State 的值为 :Waiting for master to send event ，那么说

明配置是没问题的可以进行下一步同步尝试了。

 
看截图 

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