基于docker快速构建MySQL主从复制环境

前言：最近一段时间在研究mysql主从复制，但觉得开虚拟机搭建太麻烦；刚好最近在学习Docker；于是顺便写了个自动搭建shell 脚本；

1、建议先下载好mysql镜像：docker pull mysql:5.6.34

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2、执行脚本；

如下：

root@default:/mnt/sda1/dockers/tesh# more test2.sh

#!/bin/bash

#mysql数据文件路径;
MASTER_DATA_DIR=/docker/mysql/data/master
SLAVE_DATA_DIR=/docker/mysql/data/slave

#mysql配置文件路径;
MASTER_DIR=/docker/mysql/master
SLAVE_DIR=/docker/mysql/slave

##第一次执行，删除已存在的相关容器；
docker rm -f mysql-master
docker rm -f mysql-slave

##删除已存在的路径；
rm -rf $MASTER_DATA_DIR $SLAVE_DATA_DIR $MASTER_DIR $SLAVE_DIR

##创建路径相关文件夹；
mkdir -p $MASTER_DATA_DIR $SLAVE_DATA_DIR $MASTER_DIR $SLAVE_DIR

#master.cnf 配置文件
echo "
[mysqld]
#设置server-id
server_id = 1
#设置数据库字符集参数
character-set-server=utf8mb4
collation-server=utf8mb4_unicode_ci
#存储引擎配置，可选INNODB、MyISAM
default-storage-engine=INNODB

#Optimize omit
#ql_mode模式，默认配置；
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
#开启二进制日志
log-bin = /var/lib/mysql/binlog
#log_bin_trust_function_creators 变量设置为1，MySQL不会对创建存储函数实施这些限制；
log_bin_trust_function_creators=1
#mysql复制主要有三种方式：基于SQL语句的复制，基于行的复制，混合模式复制。
#对应的，binlog的格式也有三种：STATEMENT，ROW，MIXED。
binlog_format = ROW
#日志自动清理配置
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
" > $MASTER_DIR/master.cnf

#slave.cnf 配置文件
echo "
[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
" > $SLAVE_DIR/slave.cnf

## Start instance
## Master容器创建
docker run --name mysql-master
-p 13306:3306
-v $MASTER_DIR:/etc/mysql/conf.d
-v $MASTER_DATA_DIR:/var/lib/mysql
-e MYSQL_ROOT_PASSWORD=root
-d mysql:5.6.34

## Slave容器创建
docker run --name mysql-slave
-p 23306:3306
-v $SLAVE_DIR:/etc/mysql/conf.d
-v $SLAVE_DATA_DIR:/var/lib/mysql
-e MYSQL_ROOT_PASSWORD=root
--link mysql-master:master
-d mysql:5.6.34

## 需要等待容器起来，服务起来，等待20秒；
sleep 20

## 创建主从同步账号并授权
docker exec -it mysql-master mysql -proot -e "CREATE USER 'repl'@'%' IDENTIFIED BY 'repl';"
docker exec -it mysql-master mysql -proot -e "GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';"

##二进制文件 和 位置
File_tag=`docker exec -it mysql-master mysql -proot -e "show master statusG" |grep File |awk '{print $2}'`
Position_tag=`docker exec -it mysql-master mysql -proot -e "show master statusG" |grep Position |awk '{print $2}'`

##停止slave 防止已存在进程；（可注释掉该行）
docker exec -it mysql-slave mysql -proot -e "stop slave;"
##执行同步SQL语句
docker exec -it mysql-slave mysql -proot -e "
CHANGE MASTER TO
MASTER_HOST='master',
MASTER_PORT=3306,
MASTER_USER='repl',
MASTER_PASSWORD='repl',
MASTER_LOG_FILE='$File_tag',
MASTER_LOG_POS=$Position_tag;
"
##启动slave
docker exec -it mysql-slave mysql -proot -e "start slave;"
## 查看主从状态，Slave_IO_Running: Yes 和 Slave_SQL_Running: Yes 说明mysql 主从（一主一从）搭建成功；
docker exec -it mysql-slave mysql -proot -e "show slave statusG"

##完成

---------------------------------------------

3、执行输出：

root@default:/mnt/sda1/dockers/tesh# sh test2.sh
mysql-master
mysql-slave
52754e8a17681f3642934a1b6521775c7b3c8174e492c7cfeb0aae3f59370220
95d19e9dfc9693d768ae9edded3cb2220c77468cc73e63682d59ea786ac3e3bb
Warning: Using a password on the command line interface can be insecure.
Warning: Using a password on the command line interface can be insecure.
Warning: Using a password on the command line interface can be insecure.
Warning: Using a password on the command line interface can be insecure.
Warning: Using a password on the command line interface can be insecure.
Warning: Using a password on the command line interface can be insecure.
*************************** 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.000004
Read_Master_Log_Pos: 403
Relay_Log_File: slave-relay-bin.000002
Relay_Log_Pos: 280
Relay_Master_Log_File: binlog.000004
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: 403
Relay_Log_Space: 453
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: f41c4d43-7899-11e8-aff1-0242ac110002
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 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

参考1：https://www.cnblogs.com/ivictor/p/6440429.html

参考2：https://blog.csdn.net/lijiqidong/article/details/78482908