This article brings you an introduction to the MySQL two-way backup method (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
MySQL two-way backup is also called master-master backup, that is, both MySQL services are Master, and any one of them is the Slave of another service.
Preparation
Server
MySQL Server
Version
IP Address
masterA
5.6.41
192.168.1.201
##masterB
5.6.41
192.168.1.202
Note:
The backup MySQL server version should be kept consistent as much as possible. Different versions may have binary log formats. Not compatible.
Specific operation
AttentionDuring the operation, pay attention to the consistency of the data on both sides! ! ! masterA configurationmy.cnf
[mysqld]
# 服务器唯一标识
server-id=1
# 二进制日志文件名
log-bin=mysql-bin
# 需要备份的数据库，多个数据库用 , 分隔
binlog-do-db=piumnl
# 需要复制的数据库，多个数据库用 , 分隔
replicate-do-db=piumnl
# 中继日志文件名
relay_log=mysqld-relay-bin
# 手动启动同步服务，避免突然宕机导致的数据日志不同步
skip-slave-start=ON
# 互为主从需要加入这一行
log-slave-updates=ON
# 禁用符号链接，防止安全风险，可不加
symbolic-links=0
# 可不加
# resolve - [Warning] Slave SQL: If a crash happens this configuration does not guarantee that the relay log info will be consistent, Error_code: 0
master-info-repository=table
relay-log-info-repository=table
relay-log-recovery=1
# 可不加
# 禁用 dns 解析，会使授权时使用的域名无效
skip-host-cache
skip-name-resolve
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
Copy after login
masterB configurationmy.cnf
# 不再解释各个配置项
[mysqld]
server-id=2
log-bin=mysql-bin
binlog-do-db=piumnl
replicate-do-db=piumnl
relay_log=mysql-relay-bin
skip-slave-start=ON
log-slave-updates=ON
symbolic-links=0
# resolve - [Warning] Slave SQL: If a crash happens this configuration does not guarantee that the relay log info will be consistent, Error_code: 0
master-info-repository=table
relay-log-info-repository=table
relay-log-recovery=1
skip-host-cache
skip-name-resolve
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
Copy after login
Create backup usermasterA & masterB both need to create a backup user:
create user 'rep'@'%' identified by 'rep'; # 创建一个账户
grant replication slave on *.* to 'rep'@'%'; # 授予该账户对任意数据库任意表的主从备份权限
Copy after login
Note:
MySQL under Linux is closed for the
root@% usergrant_privPermissions, so if it is a remote login, authorization failure will occur
The backup user account and password here may not be consistent, here to simplify the operation, use the same account and password
Restart the serverRestart the serverEnable backupmasterAView masterB status
show slave status\G;
# 查看最重要的两项，两个都必须为 Yes ，有一个为 No 都要去查看错误日志文件，看看什么地方存在问题
# Slave_IO_Running: Yes
# Slave_SQL_Running: Yes
Copy after login
masterB
Reverse the operation of masterA
TestInsert data into masterA and masterB respectively, and check whether the expected data appears on the other server in time ProblemMySQL Slave Failed to Open the Relay LogThis should be a problem with the relay log. You can try the following operations
stop slave;
flush logs;
start slave;
Copy after login
Got fatal error 1236 from master when reading data from binary logWhen pulling the log from the main library, it is found that the first file in the mysql_bin.index file of the main library does not exist.
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