MariaDB 10.5 : バックアップ2021/05/19

	MariaDB のデータベースをバックアップ/リストアする際は付属のツールで実行可能です。
[1]	バックアップツールは通常 MariaDB Server と同時にインストールされますが、もしをインストールされていない場合は以下のようにしてインストールします。

[root@www ~]#

dnf -y install mariadb-backup

[2]	バックアップを実行します。例として、[/home/mariadb_backup] ディレクトリ配下にバックアップを取得します。

[root@www ~]#

mkdir /home/mariadb_backup

[root@www ~]#

mariabackup --backup --target-dir /home/mariadb_backup -u root

[00] 2021-05-17 19:53:21 Connecting to MySQL server host: localhost, user: root, password: not set, port: not set, socket: not set
[00] 2021-05-17 19:53:21 Using server version 10.5.9-MariaDB
mariabackup based on MariaDB server 10.5.9-MariaDB Linux (x86_64)
[00] 2021-05-17 19:53:21 uses posix_fadvise().
[00] 2021-05-17 19:53:21 cd to /var/lib/mysql/
[00] 2021-05-17 19:53:21 open files limit requested 0, set to 1024
.....
.....
[00] 2021-05-17 19:53:23         ...done
[00] 2021-05-17 19:53:23 Writing xtrabackup_info
[00] 2021-05-17 19:53:23         ...done
[00] 2021-05-17 19:53:23 Redo log (from LSN 47638 to 47650) was copied.
[00] 2021-05-17 19:53:23 completed OK!

[root@www ~]#

ll /home/mariadb_backup

total 12340
-rw-r-----. 1 root root    24576 May 17 19:53 aria_log.00000001
-rw-r-----. 1 root root       52 May 17 19:53 aria_log_control
-rw-r-----. 1 root root      297 May 17 19:53 backup-my.cnf
-rw-r-----. 1 root root      992 May 17 19:53 ib_buffer_pool
-rw-r-----. 1 root root 12582912 May 17 19:53 ibdata1
-rw-r-----. 1 root root     2560 May 17 19:53 ib_logfile0
drwx------. 2 root root     4096 May 17 19:53 mysql
drwx------. 2 root root       20 May 17 19:53 performance_schema
drwx------. 2 root root       64 May 17 19:53 test_database
-rw-r-----. 1 root root       73 May 17 19:53 xtrabackup_checkpoints
-rw-r-----. 1 root root      429 May 17 19:53 xtrabackup_info

[3]	バックアップしたデータを、他ホスト上の MariaDB サーバーへリストアします。事前にバックアップしたデータを [tar] でまとめるなり [rsync] でそのまま転送する等して、バックアップデータをリストア先サーバーに転送しておいてください。

# MariaDB を停止して既存データは削除

[root@node01 ~]#

systemctl stop mariadb

[root@node01 ~]#

rm -rf /var/lib/mysql/*

# 転送したバックアップデータ

[root@node01 ~]#

ll mariadb_backup.tar.gz

-rw-r--r--. 1 fedora fedora 409050 May 17 20:06 mariadb_backup.tar.gz
[root@node01 ~]#

tar zxvf mariadb_backup.tar.gz

# リストア事前タスク実行 ([completed OK] であれば OK)

[root@node01 ~]#

mariabackup --prepare --target-dir /root/mariadb_backup

mariabackup based on MariaDB server 10.5.9-MariaDB Linux (x86_64)
[00] 2021-05-17 20:07:28 cd to /root/mariadb_backup/
[00] 2021-05-17 20:07:28 open files limit requested 0, set to 1024
[00] 2021-05-17 20:07:28 This target seems to be not prepared yet.
[00] 2021-05-17 20:07:28 mariabackup: using the following InnoDB configuration for recovery:
[00] 2021-05-17 20:07:28 innodb_data_home_dir = .
[00] 2021-05-17 20:07:28 innodb_data_file_path = ibdata1:12M:autoextend
[00] 2021-05-17 20:07:28 innodb_log_group_home_dir = .
[00] 2021-05-17 20:07:28 InnoDB: Using Linux native AIO
[00] 2021-05-17 20:07:28 Starting InnoDB instance for recovery.
[00] 2021-05-17 20:07:28 mariabackup: Using 104857600 bytes for buffer pool (set by --use-memory parameter)
2021-05-17 20:07:28 0 [Note] InnoDB: Uses event mutexes
2021-05-17 20:07:28 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2021-05-17 20:07:28 0 [Note] InnoDB: Number of pools: 1
2021-05-17 20:07:28 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions
2021-05-17 20:07:28 0 [Note] InnoDB: Using Linux native AIO
2021-05-17 20:07:28 0 [Note] InnoDB: Initializing buffer pool, total size = 104857600, chunk size = 104857600
2021-05-17 20:07:28 0 [Note] InnoDB: Completed initialization of buffer pool
2021-05-17 20:07:28 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=47638,47638
[00] 2021-05-17 20:07:28 Last binlog file , position 0
[00] 2021-05-17 20:07:28 completed OK!

# リストア実行

[root@node01 ~]#

mariabackup --copy-back --target-dir /root/mariadb_backup

mariabackup based on MariaDB server 10.5.9-MariaDB Linux (x86_64)
[01] 2021-05-17 20:07:43 Copying ibdata1 to /var/lib/mysql/ibdata1
[01] 2021-05-17 20:07:43         ...done
[01] 2021-05-17 20:07:43 Copying ./mysql/innodb_table_stats.ibd to /var/lib/mysql/mysql/innodb_table_stats.ibd
[01] 2021-05-17 20:07:43         ...done
.....
.....
[01] 2021-05-17 20:07:43         ...done
[01] 2021-05-17 20:07:43 Copying ./ib_buffer_pool to /var/lib/mysql/ib_buffer_pool
[01] 2021-05-17 20:07:43         ...done
[01] 2021-05-17 20:07:43 Copying ./xtrabackup_info to /var/lib/mysql/xtrabackup_info
[01] 2021-05-17 20:07:43         ...done
[00] 2021-05-17 20:07:43 completed OK!

[root@node01 ~]#

chown -R mysql. /var/lib/mysql

[root@node01 ~]#

systemctl start mariadb