mysql两主一从配置

三台服务器：主机192.168.11.126,192.168.11.127,从：192.168.11.128

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准备同步的库：192.168.11.126 ，account_db,192.168.11.127，game_db;

首先在各自服务器上面安装MySQL，在从机上面用mysqld_multi安装2个数据库，3307,3308

3307对应192.168.11.126，3308对应192.168.11.127；

1,建立好目录：

mkdir -p /data/mysql{3307,3308}

mkdir -p /data/mysql{3307,3308}/data

mkdir -p /data/mysql{3307,3308}/binlog

mkdir -p /data/mysql{3307,3308}/relay_log

chown -R mysql:mysql /data/mysql{3307,3308}

chown -R mysql:mysql /data/mysql{3307,3308}/data

vim /etc/my.cnf

 添加：

[mysqld_multi]

mysqld=/data/mysql/bin/mysqld_safe

mysqladmin=/data/mysql/bin/mysqladmin

log=/data/mysql/mydata/log/mysqld_multi.log

[mysqld1]

port= 3307

socket= /data/mysql3307/mysql.sock

datadir         = /data/mysql3307/data

server-id = 1231

expire_logs_days = 2

log-bin = /data/mysql3307/mysqllog/binlog/mysql-bin

replicate-do-db=account_db

replicate-ignore-db=mysql

relay_log =/data/mysql3307/relay_log/mysql-relay-bin

log_slave_updates = 1

character_set_server = utf8

sql_mode =  NO_AUTO_CREATE_USER

read_only = 0

wait_timeout            = 64800

interactive_timeout     = 64800

skip-name-resolve

#default-character-set = utf8

lower_case_table_names  = 1

初始化数据库： 

/data/mysql/scripts/mysql_install_db --user=mysql --basedir=/data/mysql --datadir=/data/mysql3307/data

--user–basedir分开要不会报错；

会跳出下面信息：

/data/mysql/scripts/mysql_install_db --user=mysql --basedir=/data/mysql --datadir=/data/mysql3307/data

WARNING: The host 'iZbp11h60sm7xheqt4hlh2Z' could not be looked up with /data/mysql/bin/resolveip.

This probably means that your libc libraries are not 100 % compatible

with this binary MySQL version. The MySQL daemon, mysqld, should work

normally with the exception that host name resolving will not work.

This means that you should use IP addresses instead of hostnames

when specifying MySQL privileges !

Installing MySQL system tables...2017-07-21 16:21:10 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2017-07-21 16:21:10 0 [Note] Ignoring --secure-file-priv value as server is running with --bootstrap.

2017-07-21 16:21:10 0 [Note] /data/mysql/bin/mysqld (mysqld 5.6.34) starting as process 24280 ...

2017-07-21 16:21:10 24280 [Note] InnoDB: Using atomics to ref count buffer pool pages

2017-07-21 16:21:10 24280 [Note] InnoDB: The InnoDB memory heap is disabled

2017-07-21 16:21:10 24280 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

.......

2017-07-21 16:21:12 24280 [Note] RSA private key file not found: /data/mysql3307/data//private_key.pem. Some authentication plugins will not work.

2017-07-21 16:21:12 24280 [Note] RSA public key file not found: /data/mysql3307/data//public_key.pem. Some authentication plugins will not work.

2017-07-21 16:21:12 24280 [Note] Binlog end

2017-07-21 16:21:12 24280 [Note] InnoDB: FTS optimize thread exiting.

2017-07-21 16:21:12 24280 [Note] InnoDB: Starting shutdown...

2017-07-21 16:21:13 24280 [Note] InnoDB: Shutdown completed; log sequence number 1625977

OK

2017-07-21 16:21:13 24302 [Note] RSA public key file not found: /data/mysql3307/data//public_key.pem. Some authentication plugins will not work.

2017-07-21 16:21:13 24302 [Note] Binlog end

2017-07-21 16:21:13 24302 [Note] InnoDB: FTS optimize thread exiting.

2017-07-21 16:21:13 24302 [Note] InnoDB: Starting shutdown...

2017-07-21 16:21:15 24302 [Note] InnoDB: Shutdown completed; log sequence number 1625987

OK

To start mysqld at boot time you have to copy

.........

WARNING: Default config file /etc/my.cnf exists on the system

This file will be read by default by the MySQL server

If you do not want to use this, either remove it, or use the

--defaults-file argument to mysqld_safe when starting the server

同样准备3308端口的数据库及初始化及配置my.cnf端口不同，同步数据库名字修改：

/data/mysql/scripts/mysql_install_db --user=mysql --basedir=/data/mysql --datadir=/data/mysql3308/data

启动：

mysqld_multi --defaults-extra-file=/etc/my.cnf start 1,2

mysqld_multi --defaults-extra-file=/etc/my.cnf  report

Reporting MySQL servers

MySQL server from group: mysqld1 is running

MySQL server from group: mysqld2 is running

停止：

mysqld_multi --defaults-extra-file=/etc/my.cnf stop 1,2

单个进入mysql：

mysql --socket=/data/mysql3307/mysql.sock

mysql --socket=/data/mysql3307/mysql.sock -uroot -p

mysql --socket=/data/mysql3308/mysql.sock

[root@iZbp11h60sm7xheqt4hlh2Z data]# mysql --socket=/data/mysql3308/mysql.sock

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.6.34-log Source distribution

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

mysql> select @@port;

+--------+

| @@port |

+--------+

|   3308 |

+--------+

1 row in set (0.00 sec)

mysql --socket=/data/mysql3308/mysql.sock -uroot -p

 use game_db;

source /home/game_db.sql;

select * from user  where user ='root' \G;

update user set host="192.168.11.%" where host='127.0.0.1';

update user set password=password('123456')where user='root';

主库给rep权限：

grant replication slave,file on *.* to 'replicate'@'192.168.11.128' identified by 'rep@123';

主库上面添加字段：

server-id=1   #设置服务器id，为1表示主服务器，注意：如果原来的配置文件中已经有这一行，就不用再添加了。
log_bin=mysql-bin  #启动MySQ二进制日志系统，注意：如果原来的配置文件中已经有这一行，就不用再添加了。
binlog-do-db=game_db  #需要同步的数据库名，如果有多个数据库，可重复此参数，每个数据库一行
binlog-ignore-db=mysql   #不同步mysql系统数据库
service mysqld  restart  #重启MySQL
mysql -u root -p   #进入mysql控制台
show master status;  查看主服务器，出现以下类似信息拿192.168.11.127game_db来说吧:

+------------------+----------+--------------+------------------+
| File                        | Position  | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000002 |    120    |game_db    | mysql                  |
+------------------+----------+--------------+------------------+

配置MySQL从服务器的my.cnf文件
vi /etc/my.cnf   #编辑配置文件，在[mysqld]部分添加下面内容
server-id=2   #配置文件中已经有一行server-id=1，修改其值为2，表示为从数据库
log-bin=mysql-bin  #启动MySQ二进制日志系统，注意：如果原来的配置文件中已经有这一行，就不用再添加了。
replicate-do-db=game_db#需要同步的数据库名，如果有多个数据库，可重复此参数，每个数据库一行
replicate-ignore-db=mysql   #不同步mysql系统数据库

配置以后重启mysql3308；

 stop slave;

change master to master_host='192.168.11.127',master_user='replicate',master_password='rep@123',master_log_file='mysql-bin.000002',master_log_pos=120;

  start slave

show slave status \G;

mysql> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.11.127

                  Master_User: replicate

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000002

          Read_Master_Log_Pos: 2234

               Relay_Log_File: mysql-relay-bin.000002

                Relay_Log_Pos: 2069

        Relay_Master_Log_File: mysql-bin.000002

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

              Replicate_Do_DB: game_db,game_db

          Replicate_Ignore_DB:

           Replicate_Do_Table:

       Replicate_Ignore_Table:

      Replicate_Wild_Do_Table:

  Replicate_Wild_Ignore_Table:

                   Last_Errno: 0

                   Last_Error:

                 Skip_Counter: 0

          Exec_Master_Log_Pos: 2234

              Relay_Log_Space: 2242

              Until_Condition: None

               Until_Log_File:

                Until_Log_Pos: 0

           Master_SSL_Allowed: No

           Master_SSL_CA_File:

           Master_SSL_CA_Path:

              Master_SSL_Cert:

            Master_SSL_Cipher:

               Master_SSL_Key:

        Seconds_Behind_Master: 0

Master_SSL_Verify_Server_Cert: No

                Last_IO_Errno: 0

                Last_IO_Error:

               Last_SQL_Errno: 0

               Last_SQL_Error:

  Replicate_Ignore_Server_Ids:

             Master_Server_Id: 1

                  Master_UUID: 84631394-7036-11e7-b3e9-000c29b53e0b

             Master_Info_File: /data/mysql3308/data/master.info

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

           Master_Retry_Count: 86400

                  Master_Bind:

      Last_IO_Error_Timestamp:

     Last_SQL_Error_Timestamp:

               Master_SSL_Crl:

           Master_SSL_Crlpath:

           Retrieved_Gtid_Set:

            Executed_Gtid_Set:

                Auto_Position: 0

1 row in set (0.00 sec)

ERROR:

No query specified

note：mysql端口不是默认3306的话在my.cnf修改。从机记得加上master_port=port

change master to master_host='192.168.11.127',master_user='replicate',master_port=3306，master_password='rep@123',master_log_file='mysql-bin.000002',master_log_pos=120;