MySQL主从

1、准备两台服务器  centos7

192.168.52.35

192.168.52.36

2、关闭防火墙

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# setenforce 0

3、两台都下载mysql

yum -y install mariadb mariadb-server

4、编辑MySQL配置文件

第一台：

[root@localhost ~]# vim /etc/my.cnf

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd

server-id=1     #添加
log-bin=mysql-bin    #添加
relay-log=mysql-relay   #添加

第二台：

[root@localhost ~]# vim /etc/my.cnf

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd

server-id=2   #添加
log-bin=mysql-bin   #添加
relay-log=mysql-relay    #添加

5、开启mysql服务

systemctl restart mariadb

6、进入第一台主的服务器

[root@localhost ~]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or g.
Your MariaDB connection id is 2
Server version: 5.5.64-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]> create user tom;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> grant all on *.* to'tom'@'192.168.52.36' identified by '123';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000003 |      529 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> 

打开第二台的mysql

[root@localhost ~]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or g.
Your MariaDB connection id is 2
Server version: 5.5.64-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)

MariaDB [(none)]> change master to
    -> master_host='192.168.52.35',
    -> master_password='123',
    -> master_user='tom',
    -> master_log_file='mysql-bin.000003',
    -> master_log_pos=529;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)

Slave_IO_Running: Yes    #这俩个要变成yes才算成功
Slave_SQL_Running: Yes