搭建mysql主主
搭建mysql主主
实验环境 192.168.137.11 (lamp) 和192.168.137.12(mysql)
先搭建主从，在搭建主主。
1.搭建环境 根据auto_lamp.tar 里面的安装包和脚本来搭建。
192.168.137.11 运行脚本auto_lamp_3.0.sh
选择7自动安装lamp平台。
192.168.137.11 运行脚本auto_lamp_3.0.sh
选择4自动安装mysql平台。
2.配置mysql主从。
a. 在192.168.137.11上。
[root@hx~]# vim /etc/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
key_buffer_size= 384M
max_allowed_packet= 1M
table_open_cache= 512
sort_buffer_size= 2M
read_buffer_size= 2M
read_rnd_buffer_size= 8M
myisam_sort_buffer_size= 64M
thread_cache_size= 8
query_cache_size= 32M
thread_concurrency= 8
datadir=/mydata/data/
log-bin=mysql-bin
server-id = 1
auto_increment_offset=1
auto_increment_increment=2
[mysqldump]
quick
max_allowed_packet= 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size= 256M
sort_buffer_size= 256M
read_buffer= 2M
write_buffer= 2M
[mysqlhotcopy]
interactive-timeout
[mysql_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
replicate-do-db=all
***背景的参数为自己添加的。
这里有几个重要的参数。
log-bin=mysql-bin #开启bin-log日志，记录msql主上的操作。
server-id = 1 #mysql服务id
auto_increment_offset=1
auto_increment_increment=2
(mysql中有自增长字段，在做数据库的主主同步时需要设置自增长的两个相关配置：
auto_increment_offset和auto_increment_increment。
auto_increment_offset表示自增长字段从那个数开始，他的取值范围是1-65535
auto_increment_increment表示自增长字段每次递增的量，其默认值是1，取值范围是1-65535
在主主同步配置时，需要将两台服务器的auto_increment_increment增长量都配置为2，而要把auto_increment_offset分别配置为1和2,这样才可以避免两台服务器同时做更新时自增长字段的值之间发生冲突。)
replicate-do-db=all #允许slave同步哪个库
重启mysqld服务
[root@hx~]# /etc/init.d/mysqld restart
Shuttingdown MySQL. SUCCESS!
StartingMySQL.. SUCCE
b. 在192.168.137.12上
[root@localhost ~]# vim /etc/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
key_buffer_size= 384M
max_allowed_packet= 1M
table_open_cache= 512
sort_buffer_size= 2M
read_buffer_size= 2M
read_rnd_buffer_size= 8M
myisam_sort_buffer_size= 64M
thread_cache_size= 8
query_cache_size= 32M
thread_concurrency= 8
datadir=/mydata/data/
log-bin=mysql-bin
server-id = 2
auto_increment_offset=2
auto_increment_increment=2
[mysqldump]
quick
max_allowed_packet= 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size= 256M
sort_buffer_size= 256M
read_buffer= 2M
write_buffer= 2M
[mysqlhotcopy]
interactive-timeout
[mysql_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
replicate-do-db=all
修改了server-id=2 还有auto_increment_increment=2
其他没变化，然后重启下mysql服务。
c. 搭建mysql主从
在192.168.137.11上操作
[root@hx ~]# /usr/local/mysql/bin/mysql #进入数据库
mysql> grant replication slave on *.* to tongbu@'192.168.137.12' identifiedby '123456';
Query OK, 0 rows affected (0.01 sec)
mysql> show master status ;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000004 | 268 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.01 sec)
在192.168.137.12mysql从上操作
[root@hx ~]# /usr/local/mysql/bin/mysql #进入数据库
mysql> change master tomaster_host='192.168.137.11',master_user='tongbu',master_password='123456',master_log_file='mysql-bin.000004',master_log_pos=268;
Query OK, 0 rows affected (0.03 sec)
mysql> start slave ;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G
*************************** 1. row***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.137.11
Master_User: tongbu
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000004
Read_Master_Log_Pos: 268
Relay_Log_File: localhost-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
.....省略
只要看到io线程和sql线程都是yes代表，mysql主从搭建完毕。
测试mysql主从。
在mysql主上创建数据库（192.168.137.11）
mysql> create database bbs ;
Query OK, 1 row affected (0.00 sec)
mysql> show databases ;
+--------------------+
| Database |
+--------------------+
| information_schema |
|bbs |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
在mysql从上查看是否创建bbs数据库。（192.168.137.12）
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
|bbs |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
测试完成，mysql主从已经搭建完成，下面开始搭建mysql主主。
3. 配置mysql主主
a. 首先删除mysql主下面的，mysql-bin.index 和下面的日志
[root@hx ~]# cd /mydata/data/
[root@hx data]# ls
bbs ibdata1 mysql mysql-bin.000003 performance_schema
hx.err ib_logfile0 mysql-bin.000001 mysql-bin.000004 test
hx.pid ib_logfile1 mysql-bin.000002 mysql-bin.index
[root@hx data]# rm -rf mysql-bin.*
b. 在mysql主上授权（192.168.137.12）
[root@localhost ~]#/usr/local/mysql/bin/mysql #进去mysql数据库
mysql> grant replication slave on *.* totongbu@'192.168.137.11' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql> show master status ;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000004 | 267 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.01 sec)
c. 在mysql从上设置节点，和主ip
[root@hx data]# /usr/local/mysql/bin/mysql
mysql> change master tomaster_host='192.168.137.12',master_user='tongbu',master_password='123456',master_log_file='mysql-bin.000004',master_log_pos=267;
Query OK, 0 rows affected (0.01 sec)
mysql> slave start;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G
*************************** 1. row***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.137.12
Master_User: tongbu
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000004
Read_Master_Log_Pos: 267
Relay_Log_File: hx-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
....省略
另一方的mysql从上也搭建好了，我们可以来测试mysql主主了。
d. 测试mysql主主
在192.168.137.11 和 192.168.137.12 上分别创建bbs1 和 bbs2
测试成功，mysql主主搭建完毕。看下图..