mysql主从配置

① 环境准备

本地安装两个mysql，或者使用虚拟机，或者使用docker安装，需要准备两个mysql，本文使用docker安装，具体安装方法详见
https://www.jianshu.com/p/10769f985516

环境
宿主机 centos7
mysql:5.6
mysql1(master): 172.17.0.3:3307
mysql2(slave): 172.17.0.2:3308

② mysql 配置文件配置

mysql1(master): 172.17.0.3 my.cnf 配置文件设置，mysql

#mysql master1 config 
[mysqld]
server-id = 1        # 节点ID，确保唯一

# log config
log-bin = mysql-bin     #开启mysql的binlog日志功能
sync_binlog = 1         #控制数据库的binlog刷到磁盘上去 , 0 不控制，性能最好，1每次事物提交都会刷到日志文件中，性能最差，最安全
binlog_format = mixed   #binlog日志格式，mysql默认采用statement，建议使用mixed
expire_logs_days = 7                           #binlog过期清理时间
max_binlog_size = 100m                    #binlog每个日志文件大小
binlog_cache_size = 4m                        #binlog缓存大小
max_binlog_cache_size= 512m              #最大binlog缓存大
binlog-ignore-db=mysql #不生成日志文件的数据库，多个忽略数据库可以用逗号拼接，或者 复制这句话，写多行

auto-increment-offset = 1     # 自增值的偏移量
auto-increment-increment = 1  # 自增值的自增量
slave-skip-errors = all #跳过从库错误

mysql2(slave): 172.17.0.2 mysql.cnf 配置

[mysqld]
server-id = 2
log-bin=mysql-bin
relay-log = mysql-relay-bin
replicate-wild-ignore-table=mysql.%
replicate-wild-ignore-table=test.%
replicate-wild-ignore-table=information_schema.%

重启两个mysql，让配置生效

③ master数据库，创建复制用户并授权

1.进入master的数据库，为master创建复制用户

CREATE USER repl_user IDENTIFIED BY 'repl_passwd';

2.赋予该用户复制的权利

grant replication slave on *.* to 'repl_user'@'172.17.0.2'  identified by 'repl_passwd';

FLUSH PRIVILEGES;

3.查看master的状态

show master status;
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000005      120|              | mysql            |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

4,配置从库

mysql> CHANGE MASTER TO 
MASTER_HOST = '172.17.0.3',  
MASTER_USER = 'repl_user', 
MASTER_PASSWORD = 'repl_passwd',
MASTER_PORT = 3307,
MASTER_LOG_FILE='mysql-bin.000005',
MASTER_LOG_POS=120,
MASTER_RETRY_COUNT = 60,
MASTER_HEARTBEAT_PERIOD = 10000; 

# MASTER_LOG_FILE='mysql-bin.000005',#与主库File 保持一致
# MASTER_LOG_POS=120 , #与主库Position 保持一致

启动从库slave进程

mysql> start slave;
Query OK, 0 rows affected (0.04 sec)