环境:多实例
10.0.0.52 3306
10.0.0.52 3307
3306---->3307复制---->3309
---->3008复制
3306<---->3307
架构实践:
3306---->3307
1开启主库binlog,配置server-id
[[email protected] ~]# egrep -i"server-id|log-bin" /data/3306/my.cnf
log-bin = /data/3306/mysql-bin
server-id = 6 #注意id号不能一样，要区别
重启服务
开启主库binlog日志
vim /data/3306/my.cnf
pid-file = /data/3306/mysql.pid
log-bin = /data/3306/mysql-bin ###将此行注释去掉，然后重新启动多实例
relay-log = /data/3306/relay-bin
"/data/3306/my.cnf" [dos]72L, 1824C written
[[email protected] backup]#
从库
[[email protected] ~]# egrep -i"server-id|log-bin" /data/3307/my.cnf
#log-bin = /data/3307/mysql-bin
server-id = 7
2.主库创建用户
mysql> grant replication slave on *.* to ‘rep‘@‘172.16.1.%‘identified by ‘oldboy123‘;
Query OK, 0 rows affected (0.04 sec)
mysql> select user,host frommysql.user;
+------+------------+
| user | host |
+------+------------+
| root | 127.0.0.1 |
| rep | 172.16.1.% |
3.主库导出数据
按照我们讲过的内容,直接取今天00点的备份就可以.
mysql> flush table with read lock; ####一般大部分情况不需要锁库，因为备份的时候已经有参数备份了。
Query OK, 0 rows affected (0.00 sec)
mysql> show master status; ####获取binlog日志关键点
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 120 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysqldump
cp/tar
xtrabackup
拿到位置点是关键
mysql-bin.000001 120
[[email protected] ~]# mysqldump -B --master-data=2 --single-transaction -S/data/3306/mysql.sock -A|gzip>/data/backup/all_$(date +%F).sql.gz
[[email protected] ~]# ls -l /data/backup/
总用量 228
-rw-r--r-- 1 root root 178468 6月 28 11:11 all_2017-06-28.sql.gz
主库解锁:
mysql> unlock table;
Query OK, 0 rows affected (0.00 sec)
4.从库导入全备的数据
[[email protected] backup]# gzip -d all_2017-06-28.sql.gz
[[email protected] backup]# mysql -S /data/3307/mysql.sock <all_2017-06-28.sql
5.找位置点,然后change master从库
[[email protected] backup]# sed -n ‘22p‘all_2017-06-28.sql
-- CHANGE MASTER TOMASTER_LOG_FILE=‘mysql-bin.000001‘, MASTER_LOG_POS=120;
进入数据库中，然后输入下面内容
CHANGE MASTER TO
MASTER_HOST=‘172.16.1.52‘, ###主数据库的IP地址
MASTER_PORT=3306, ###主数据库的端口
MASTER_USER=‘rep‘, ###连接主数据库的用户名
MASTER_PASSWORD=‘oldboy123‘, ####连接主数据库的密码
MASTER_LOG_FILE=‘ oldboy-bin.000005‘, ###主数据库上的binlog日志
MASTER_LOG_POS=223; ###主数据库的binlog日志关键点
mysql> start slave; ###开启从库
Query OK, 0 rows affected (0.03 sec)
6.查看从库是否配置正确
mysql> show slave status\G
[[email protected] backup]# mysql -S/data/3307/mysql.sock -e "show slave status\G"|egrep"_Running|Behind_Master"|head -3
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Seconds_Behind_Master: 0
提示：一主多从类似于一主一从