MySQL 8.0 : Use Clone Feature2020/09/02 |
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Use Clone Feature to take MySQL backup which has been implemented on MySQL 8.0.17.
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| [1] | Clone feature is not enabled by default, so enable it. |
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# MySQL version root@dlp:~# mysqld --version /usr/sbin/mysqld Ver 8.0.21-0ubuntu0.20.04.4 for Linux on x86_64 ((Ubuntu))
root@dlp:~#
vi /etc/mysql/mysql.conf.d/mysqld.cnf # add into [mysqld] section [mysqld] ..... .....
plugin-load=mysql_clone.so
root@dlp:~#
systemctl restart mysql
# show plugins root@dlp:~# mysql -e "select plugin_name, plugin_status, plugin_type from information_schema.plugins where plugin_name = 'clone';" Enter password: +-------------+---------------+-------------+ | plugin_name | plugin_status | plugin_type | +-------------+---------------+-------------+ | clone | ACTIVE | CLONE | +-------------+---------------+-------------+ |
| [2] | Get Clone in a directory on localhost. |
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# create a directory for clone data root@dlp:~# mkdir /home/mysql_backup root@dlp:~# chown mysql. /home/mysql_backup # writing to target directory for cloning is denied by AppArmor, so allow it before running root@dlp:~# vi /etc/apparmor.d/usr.sbin.mysqld # add target directory to allow mysqld can write
/usr/sbin/mysqld {
.....
.....
/home/mysql_backup/ r,
/home/mysql_backup/** rwk,
}
root@dlp:~#
systemctl restart apparmor
# run getting clone # if specified directory already exists on the filesystem, it will be error, # so specify new directory for [directory = ***] section root@dlp:~# mysql -e "clone local data directory = '/home/mysql_backup/backup01/';"
ll /home/mysql_backup/backup01 total 155672 drwxr-x--- 5 mysql mysql 4096 Sep 1 19:20 ./ drwxrwxrwx 3 mysql mysql 4096 Sep 1 19:20 ../ drwxr-x--- 2 mysql mysql 4096 Sep 1 19:20 '#clone'/ -rw-r----- 1 mysql mysql 3319 Sep 1 19:20 ib_buffer_pool -rw-r----- 1 mysql mysql 12582912 Sep 1 19:20 ibdata1 -rw-r----- 1 mysql mysql 50331648 Sep 1 19:20 ib_logfile0 -rw-r----- 1 mysql mysql 50331648 Sep 1 19:20 ib_logfile1 drwxr-x--- 2 mysql mysql 4096 Sep 1 19:20 mysql/ -rw-r----- 1 mysql mysql 25165824 Sep 1 19:20 mysql.ibd drwxr-x--- 2 mysql mysql 4096 Sep 1 19:20 sys/ -rw-r----- 1 mysql mysql 10485760 Sep 1 19:20 undo_001 -rw-r----- 1 mysql mysql 10485760 Sep 1 19:20 undo_002 |
| [3] | To use [CLONE INSTANCE FROM], it's possible to get clone from a remote host directly. On Official documents, clone source is called [Donor] and clone target is called [Recipient]. |
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# on Donor Host, create a user and add [BACKUP_ADMIN] privilege for clone root@dlp:~# mysql mysql> create user 'clone_user'@'%' identified by 'password'; Query OK, 0 rows affected (0.09 sec) mysql> grant BACKUP_ADMIN on *.* to 'clone_user'@'%'; Query OK, 0 rows affected (0.10 sec) # on Recipient Host, create a user and add [CLONE_ADMIN] privilege for clone root@node01:~# mysql mysql> create user 'clone_user'@'%' identified by 'password'; Query OK, 0 rows affected (0.11 sec) mysql> grant CLONE_ADMIN on *.* to 'clone_user'@'%'; Query OK, 0 rows affected (0.04 sec) # on Recipient Host, run Clone job # before clone, set [set global clone_valid_donor_list = (Donor IP address:port)] # clone data is copied under [/var/lib/mysql] mysql> set global clone_valid_donor_list = '10.0.0.30:3306'; Query OK, 0 rows affected (0.00 sec) mysql> clone instance from clone_user@10.0.0.30:3306 identified by 'password'; Query OK, 0 rows affected (3.00 sec) # confirm clone status # OK if [STATE] is [Completed] mysql> select STATE from performance_schema.clone_status; +-----------+ | STATE | +-----------+ | Completed | +-----------+ 1 row in set (0.00 sec) # if specify cloned target directory, add [data directory = '***'] # but then it needs to set suitable permission to the target directory like [2], [3] mysql> clone instance from clone_user@10.0.0.30:3306 identified by 'password' data directory = '/home/mysql_backup/backup01/'; |
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