8.5 KiB
8.5 KiB
title, date, lastmod, tags, categories
| title | date | lastmod | tags | categories | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| MySQL 主从复制 | 2019-10-30T17:33:13+08:00 | 2020-04-18T23:40:00+08:00 |
|
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环境
- mysql 主服务器，centos7.4，192.168.1.10，端口 10000
- mysql 从服务器，centos7.4，192.168.1.6
- 要复制的数据库有 data_db、conf_db
在主服务器上创建用于备份的用户 replicator
grant replication slave on *.* to 'replicator'@'192.168.1.6' identified by 'password';
flush privileges;
在主服务器上修改 my.cnf
# 建议与本机ip地址最后一位一致,与其他互备服务器均不一致
server-id = 10
read-only = 0
# 开启 binlog
log-bin = /var/log/mysql-bin/master
binlog-format = row
# 关注要复制的数据库，存在跨库问题
binlog-do-db = data-db
binlog-do-db = conf-db
# 忽略的数据库，存在跨库问题
#binlog-ignore-db =
#binlog 有效时间
expire-logs-days =
# GTID 复制模式
#gtid-mode = ON
#enforce-gtid-consistency=true
# 双主或多主互备时，会用到以下配置
# 自增主键初始值，与其他互备服务器一致
#auto-increment-offset =
# 自增主键等差值，与其他互备服务器均不一致
#auto-increment-increment =
在主服务器上重启 mysql，获取 master 状态
-- 如果 mysql 是全新安装，则无须导出数据库初态，直接查看 binlog pos 即可
-- 锁定要导出的数据库表
flush tables with read lock;
导出数据库初态
# 在主服务器的另一个终端中运行
mysqldump -uroot -p data_db > /tmp/data_db.sql
mysqldump -uroot -p conf_db > /tmp/conf_db.sql
# 复制到从服务器上
scp /tmp/data_db.sql /tmp/conf_db.sql 192.168.1.6:/tmp/
查看 binary 日志位置
show master status\G
-- 记住输出里的如下类似两行（不记录也可以，这两个信息已经写入了导出的sql文件中）
-- File: mysql-bin.000001
-- Position: 137103822
-- 解锁数据库表
unlock tables;
在从服务器上编辑 my.cnf
# 建议与本机ip地址最后一位一致,与其他互备服务器均不一致
server-id = 6
read-only = 1
# 如果该 slave 中也运行了 master，或者使用了 gtid 模式复制，则开启 binlog
#log-bin = mysql-bin
#binlog-format = row
# 把 slave 操作也计入 binlog，用于链式同步
#log-slave-updates = ON
# 指定要复制的数据库，存在跨库问题
#replicate-do-db = data_db
#replicate-do-db = conf_db
# 指定要复制的数据表，无跨库问题
replicate-do-table = db1.t1
replicate-wild-do-table = db1.%
# 忽略的数据库，存在跨库问题
#replicate-ignore-db =
# 忽略的数据表，无跨库问题
#replicate-ignore-table = db1.t1
#replicate-wild-ignore-table = db1.%
# 中继日志
relay-log = /var/lib/mysql-bin/slave
# 多线程复制
slave-parallel-type = logical-clock
slave-parallel-workers = 4
# GTID 模式
#gtid-mode = ON
#enforce-gtid-consistency=true
# 双主或多主互备时，会用到以下配置
# 自增主键初始值，与其他互备服务器一致
#auto-increment-offset =
# 自增主键等差值，与其他互备服务器均不一致
#auto-increment-increment =
在从服务器上重启 mysql，导入初态
-- 创建要导入的数据库
create database data_db default charset utf8mb4;
create database conf_db default charset utf8mb4;
导入数据库
msyql -uroot -p data_db < /tmp/data_db.sql
mysql -uroot -p conf_db < /tmp/conf_db.sql
开启同步
-- 基于 binlog 文件位置复制
change master to master_host = '192.168.1.10',
master_port = 3306,
master_user = 'replicator',
master_password = 'password',
master_log_file = 'mysql-bin.000001',
master_log_pos = 137103822;
flush privileges;
-- 基于 gtid 复制
change master to master_host = '192.168.1.10',
master_port = 3306,
master_user = 'replicator',
master_password = 'password',
master_auto_position = 1;
启动 slave，查看 slave 状态
start slave;
-- 在从服务器上查看 slave 状态
show slave status\G
-- 如果看到
-- Slave_IO_Running: Yes
-- Slave_SQL_Running: Yes
-- 则表示 slave 开启成功！
MySQL8 gtid 互为主从配置
[mysqld]
# ---- 固定配置 ----
datadir = /var/lib/mysql
socket = /var/lib/mysql/mysql.sock
pid-file = /var/lib/mysql/mysql.pid
log-timestamps = SYSTEM
log-error = /var/log/mysql/error.log
slow-query-log = TRUE
slow-query-log-file = /var/log/mysql/slow.log
default-authentication-plugin = mysql_native_password
# ---- 动态配置 ----
mysqlx = OFF
character-set-server = utf8mb4
default-storage-engine = innodb
lower-case-table-names = 1
#skip-name-resolve = 1
#max-user-connections = 600
#innodb-buffer-pool-size = 8G
#innodb-buffer-pool-instances = 8
# master
# 确认不同节点该 id 唯一
server-id = 1
log-bin = /var/lib/mysql-bin/master
binlog-format = ROW
#binlog-do-db = db1
binlog-expire-logs-seconds = 172800
gtid-mode = ON
enforce-gtid-consistency = TRUE
# slave
replicate-wild-ignore-table = information_schema.%
replicate-wild-ignore-table = mysql.%
replicate-wild-ignore-table = performance_schema.%
replicate-wild-ignore-table = sys.%
replica-parallel-workers = 2
log-replica-updates = FALSE
relay-log = /var/lib/mysql-bin/slave
relay-log-recovery = TRUE
#read-only = ON
MySQL8 gtid 多源复制从库配置
-
修改 my.cnf
[mysqld] # ---- 固定配置 ---- datadir = /data/mysql socket = /var/lib/mysql/mysql.sock pid-file = /var/lib/mysql/mysql.pid log-timestamps = SYSTEM log-error = /var/log/mysql/error.log slow-query-log-file = /var/log/mysql/slow.log slow-query-log = TRUE default-authentication-plugin = mysql_native_password # ---- 动态配置 ---- mysqlx = OFF character-set-server = utf8mb4 default-storage-engine = innodb lower-case-table-names = 1 #skip-name-resolve = 1 #max-user-connections = 600 #innodb-buffer-pool-size = 8G #innodb-buffer-pool-instances = 8 # master server-id = 39 log-bin = /var/lib/mysql/master binlog-format = ROW #binlog-do-db = db1 gtid-mode = ON enforce-gtid-consistency = TRUE binlog-expire-logs-seconds = 172800 # slave #replicate-wild-do-table = db1.% replicate-wild-ignore-table = information_schema.% replicate-wild-ignore-table = mysql.% replicate-wild-ignore-table = performance_schema.% replicate-wild-ignore-table = sys.% slave-parallel-workers = 2 log-slave-updates = FALSE relay-log = /var/lib/mysql/slave relay-log-recovery = TRUE super_read_only = ON master_info_repository = table relay_log_info_repository = table -
导出主库数据
mysqldump -uroot -h<主库1> -p --single-transaction --set-gtid-purged=on --databases db1 > 1_db1.sql mysqldump -uroot -h<主库2> -p --single-transaction --set-gtid-purged=on --databases db2 > 2_db2.sql -
在导出的文件(1_db1.sql,2_db2.sql)中找到 "SET @@GLOBAL.gtid_purged ..." 语句，记录下来，并在该文件中删除
-
导入 1_db1.sql 和 2_db2.sql
mysql -uroot -p < 1_db1.sql mysql -uroot -p < 2_db2.sql -
合并这两个 "SET @@GLOBAL.gtid_purged ..." 语句(gtid set 做并集)，导入 gtid set 并集
set @@global.gtid_purged = '<gtid set 并集>' -
加入两个主库的同步配置
change master to master_host='<主库1>', master_port=3306, master_user='<主库上的 replication 账户>', master_password='<主库上的 replication 账户的密码>', master_auto_position=1 for channel '<master_1>'; change master to master_host='<主库2>', master_port=3306, master_user='<主库上的 replication 账户>', master_password='<主库上的 replication 账户的密码>', master_auto_position=1 for channel '<master_2>'; -
启动从库
start slave for channel '<master_1>'; start slave for channel '<master_2>'; -
查看从库
show slave status for channel '<master_1>'\G show slave status for channel '<master_2>'\G -
停止从库
-- 停止全部 slave stop slave; -- 停止指定 slave stop slave for channel '...'; -
重置从库
-- 重置全部 slave reset slave; -- 重置指定 slave reset slave for channel '...'; -
监控表: performance_schema.replication_connection_status