通过docker实现mysql主从复制

在开始搭建之前请先认真看一下我走过的坑：

先介绍一下我搭建使用的环境：centos7
坑1：mysqld: Can't read dir of '/etc/mysql/conf.d/'，这是因为Centos7安全Selinux禁止了一些安全权限，导致mysql和mariadb在进行挂载/var/lib/mysql的时候会提示如下信息

logs命令查看，发现提示信息是：chown: changing ownership of ‘/var/lib/mysql/....‘: Permission denied

于是，解决方法有这么两个：
在docker run中加入 --privileged=true  给容器加上特定权限
关闭selinux

本人采用的是第一种方式

坑2：CHANGE MASTER TO MASTER_HOST='192.168.150.129',MASTER_PORT=3306,MASTER_USER='repl',MASTER_PASSWORD='repl',MASTER_LOG_FILE='binlog.000002',MASTER_LOG_POS=761;  我在linux上配置了主机名与ip的映射，因此我再master_host填写的是我的主机名，但是一直连不上，后来改为ip地址即可

主从配置文件

master配置文件/home/mysql/etc/master/master.cnf

[mysqld]
server_id = 1

character-set-server=utf8mb4
collation-server=utf8mb4_unicode_ci
default-storage-engine=INNODB

#Optimize omit

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

log-bin     = /var/lib/mysql/binlog
log_bin_trust_function_creators=1
binlog_format = ROW
expire_logs_days = 99
sync_binlog = 0

slow-query-log=1
slow-query-log-file=/var/log/mysql/slow-queries.log
long_query_time = 3
log-queries-not-using-indexes

slave配置文件/home/mysql/etc/slave/slave.cnf

[mysqld]
server_id = 2

character-set-server=utf8mb4
collation-server=utf8mb4_unicode_ci
default-storage-engine=INNODB

#Optimize omit

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

log-bin     = /var/lib/mysql/binlog
log_bin_trust_function_creators=1
binlog_format = ROW
expire_logs_days = 99
sync_binlog = 0

relay_log=slave-relay-bin
log-slave-updates=1
slave-skip-errors=all

slow-query-log=1
slow-query-log-file=/var/log/mysql/slow-queries.log
long_query_time = 3

log-queries-not-using-indexes

启动容器,配置主从复制

创建数据目录：

mkdir -p /home/mysql/data/master
mkdir -p /home/mysql/data/slave

MASTER_DIR=/home/mysql/data/master
SLAVE_DIR=/home/mysql/data/slave

启动MySQL容器：

docker run --name mysql-master \
-v /home/mysql/etc/master:/etc/mysql/conf.d \
-v /home/mysql/data/master:/var/lib/mysql \
-e MYSQL_ROOT_PASSWORD=root \
-d \
mysql:5.7

docker run --name mysql-slave \
-v /home/mysql/etc/slave:/etc/mysql/conf.d \
-v /home/mysql/data/slave:/var/lib/mysql \
-e MYSQL_ROOT_PASSWORD=root \
--link mysql-master:master \
-d mysql:5.7

Master上创建复制用户：

docker exec -it mysql-master mysql -p

CREATE USER 'repl'@'%' IDENTIFIED BY 'repl';
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

查看Master节点 Binlog状态：

show master status\G
*************************** 1. row ***************************
File: binlog.000008
Position: 595
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)

在Slave节点上配置复制：

docker exec -it mysql-slave mysql -p

CHANGE MASTER TO \
MASTER_HOST='master',\
MASTER_PORT=3306,\
MASTER_USER='repl',\
MASTER_PASSWORD='repl',\
MASTER_LOG_FILE='binlog.000008',\
MASTER_LOG_POS=595;

start slave;

查看Salve状态：

show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: master
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000008
Read_Master_Log_Pos: 595
Relay_Log_File: slave-relay-bin.000002
Relay_Log_Pos: 317
Relay_Master_Log_File: binlog.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_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: 595
Relay_Log_Space: 524
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: 7a5a452f-fca9-11e6-be18-0242ac110002
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
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
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)