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- GreatSQL是MySQL的国产分支版本,使用上与MySQL一致。
- 作者: 王权富贵
- 文章来源:GreatSQL社区投稿
背景概述
由于安装数据库时将MySQL的数据目录放在了根目录下,现在存储空间不足,想通过mv将数据目录移动到其他目录下,但将数据目录移动到其他数据目录后,启动数据库失败。
问题复现
本次测试基于 MySQL 8.0.31
1.关闭数据库- mysql> shutdown;
- Query OK, 0 rows affected (0.02 sec)
复制代码 2.查看当前数据目录所在位置
3.通过mv移动整个MySQL数据目录到其他目录
- shell> mv /mysql80 /data
- shell> cd /data/mysql80/svr
- shell> ln -s mysql-8.0.31-linux-glibc2.12-x86_64 mysql
复制代码 4.修改属主属组
- shell> chown -R mysql.mysql /data
复制代码 5.修改配置文件中数据目录的地址
- shell> sed -i 's#/mysql80#/data/mysql80#g' my5001.cnf
复制代码 6.启动数据库
- shell> /data/mysql80/svr/mysql/bin/mysqld_safe \
- --defaults-file=/data/mysql80/conf/my5001.cnf --user=mysql &
复制代码 此时启动数据库失败,错误日志报错如下:- mysqld: File '/mysql80/dbdata/data5001/log/binlog.000012' not found (OS errno 2 - No such file or directory)
- 2023-02-27T10:38:09.240576+08:00 0 [ERROR] [MY-010958] [Server] Could not open log file.
- 2023-02-27T10:38:09.240657+08:00 0 [ERROR] [MY-010041] [Server] Can't init tc log
- 2023-02-27T10:38:09.240718+08:00 0 [ERROR] [MY-010119] [Server] Aborting
- 2023-02-27T10:38:10.548605+08:00 0 [System] [MY-010910] [Server] /data/mysql80/svr/mysql/bin/mysqld: Shutdown complete (mysqld 8.0.31) MySQL Community Server - GPL.
复制代码 这里报错显示找不到binlog文件,并且报错显示的binlog的目录还是之前的,但是配置文件中的目录已经修改- shell> grep 'log-bin' my5001.cnf
- log-bin=/data/mysql80/dbdata/data5001/log/binlog
- log-bin-trust-function-creators
复制代码 7.问题解决
最后通过查找发现 binlog.index 文件中存放着每个binlog文件的绝对路径地址,这里的路径还是之前路径,内容如下:- shell> cat binlog.index
- /mysql80/dbdata/data5001/log/binlog.000001
- /mysql80/dbdata/data5001/log/binlog.000002
- /mysql80/dbdata/data5001/log/binlog.000003
- /mysql80/dbdata/data5001/log/binlog.000004
- /mysql80/dbdata/data5001/log/binlog.000005
- /mysql80/dbdata/data5001/log/binlog.000006
- /mysql80/dbdata/data5001/log/binlog.000007
- /mysql80/dbdata/data5001/log/binlog.000008
- /mysql80/dbdata/data5001/log/binlog.000009
- /mysql80/dbdata/data5001/log/binlog.000010
- /mysql80/dbdata/data5001/log/binlog.000011
- /mysql80/dbdata/data5001/log/binlog.000012
复制代码 修改binlog.index文件中binlog的绝对路径:- shell> sed -i 's#/mysql80#/data/mysql80#g' binlog.index
- shell> cat binlog.index
- /data/mysql80/dbdata/data5001/log/binlog.000001
- /data/mysql80/dbdata/data5001/log/binlog.000002
- /data/mysql80/dbdata/data5001/log/binlog.000003
- /data/mysql80/dbdata/data5001/log/binlog.000004
- /data/mysql80/dbdata/data5001/log/binlog.000005
- /data/mysql80/dbdata/data5001/log/binlog.000006
- /data/mysql80/dbdata/data5001/log/binlog.000007
- /data/mysql80/dbdata/data5001/log/binlog.000008
- /data/mysql80/dbdata/data5001/log/binlog.000009
- /data/mysql80/dbdata/data5001/log/binlog.000010
- /data/mysql80/dbdata/data5001/log/binlog.000011
- /data/mysql80/dbdata/data5001/log/binlog.000012
复制代码 8.启动数据库
- shell> /data/mysql80/svr/mysql/bin/mysqld_safe
- --defaults-file=/data/mysql80/conf/my5001.cnf --user=mysql &
复制代码 数据库启动成功。
9.作为从节点
需要注意的是,如果该实例还作为其他实例的从节点,还需要设置 relaylog.index 文件中relay log的绝对路径,否则会报如下错误: 错误日志报错:- 2023-02-27T15:56:55.224372+08:00 0 [ERROR] [MY-010599] [Repl] log /mysql80/dbdata/data5002/log/relaylog.000002 listed in the index, but failed to stat.
- 2023-02-27T15:56:55.224422+08:00 0 [ERROR] [MY-011059] [Repl] Error counting relay log space.
- 2023-02-27T15:56:55.226571+08:00 0 [ERROR] [MY-010426] [Repl] Slave: Failed to initialize the master info structure for channel ''; its record may still be present in 'mysql.slave_master_info' table, consider deleting it.
- 2023-02-27T15:56:55.226622+08:00 0 [ERROR] [MY-010529] [Repl] Failed to create or recover replication info repositories.
复制代码 执行 start replica 时也会报错:- # 客户端报错
- mysql> start replica;
- ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository
- # error log报错
- 2023-02-27T15:57:53.858798+08:00 8 [ERROR] [MY-013124] [Repl] Slave SQL for channel '': Slave failed to initialize relay log info structure from the repository, Error_code: MY-013124
复制代码 10.问题解决
修改 relaylog.index 文件中relay log的绝对路径- sed -i 's#/mysql80#/data/mysql80#g' relaylog.index
复制代码 重新启动数据库,并启动主从复制- # 重启实例
- mysql> restart;
- # 启动主从复制
- mysql> start replica;
复制代码 此时主从复制恢复正常。
总结
- 搭建数据库前应提前规划并确定存储位置及磁盘大小,以及之后数据量增长情况,避免磁盘空间不足时导致数据库不能正常使用。
- 当我们手动进行数据目录的移动时,不仅需要修改配置文件中数据目录的路径,还需要修改 binlog.index relaylog.index 文件中binlog及relaylog的绝地路径,否则启动时可能出报错,并且不能正常建立主从关系。
Enjoy GreatSQL
来源:https://www.cnblogs.com/greatsql/p/17345624.html
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