前言
常言道:有备无患。没有备份早晚会出事得。
直接在主库进行备份，会影响性能，同时也存在不安全。例如高峰时读写，此时备份会造成很大风险。
因此通常需要开启主从功能，在从库进行备份操作。
问题
mysql主从配置的实践。
本地环境是mac ，
访问mysql工具使用了sequel pro
docker版本version 17.12.0-ce-mac49 (21995)
解决过程
- 创建目录
依次如下图目录
这里我的目录是 mysql-backup
tree
.
├── mysql-master
│ └── mysql.conf.d
│ └── mysqld.cnf
└── mysql-slave
└── mysql.conf.d
└── mysqld.cnf
- 创建主库
docker run --name mysql-master -p 3309:3306 -v $(pwd)/mysql.conf.d:/etc/mysql/mysql.conf.d -e MYSQL_ROOT_PASSWORD=123456 -d mysql:latest
其中主库的配置文件
# Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# The MySQL Server configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
#log-error = /var/log/mysql/error.log
# By default we only accept connections from localhost
#bind-address = 127.0.0.1
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-bin=mysql-bin
server-id=1
- 创建从库
# Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# The MySQL Server configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
#log-error = /var/log/mysql/error.log
# By default we only accept connections from localhost
#bind-address = 127.0.0.1
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
log-bin=mysql-bin
server-id=2
- 配置账号-在主库执行。
创建账号
CREATE USER 'repl'@'%' IDENTIFIED BY 'doudouchidou123456'
分配权限
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%'
查看是否开启Bin日志
show VARIABLES LIKE '%log_%';
image.png
SHOW BINARY LOGS;
image.png
显示日志位置
show master status
image.png
锁定读写。（非常重要。该操作确保主库暂时不再接受读写）
FLUSH TABLES WITH READ LOCK;
- 从库配置
查看id
show variables like 'server_id'
image.png
如果id相同则需要修改从库
set global server_id=2
配置访问账号
CHANGE MASTER TO
MASTER_HOST='172.17.0.6',
MASTER_USER='repl',
MASTER_PASSWORD='doudouchidou123456',
MASTER_LOG_FILE='mysql-bin.000003',
MASTER_LOG_POS=2678
启动
start slave
查看运行状态
show slave status
image.png
- 其他更多命令
停止
stop slave
重置
reset slave
查看容器ip
docker inspect mysql-master
查看运行日志
docker logs mysql-master
