MariaDB 10.3 : バックアップ2021/08/03

	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 -p password

[00] 2021-08-03 16:14:27 Connecting to MySQL server host: localhost, user: root, password: set, port: not set, socket: not set
[00] 2021-08-03 16:14:27 Using server version 10.3.28-MariaDB
mariabackup based on MariaDB server 10.3.28-MariaDB Linux (x86_64)
[00] 2021-08-03 16:14:27 uses posix_fadvise().
[00] 2021-08-03 16:14:27 cd to /var/lib/mysql/
[00] 2021-08-03 16:14:27 open files limit requested 0, set to 1024
[00] 2021-08-03 16:14:27 mariabackup: using the following InnoDB configuration:
[00] 2021-08-03 16:14:27 innodb_data_home_dir =
[00] 2021-08-03 16:14:27 innodb_data_file_path = ibdata1:12M:autoextend
[00] 2021-08-03 16:14:27 innodb_log_group_home_dir = ./
[00] 2021-08-03 16:14:27 InnoDB: Using Linux native AIO
2021-08-03 16:14:27 0 [Note] InnoDB: Number of pools: 1
[00] 2021-08-03 16:14:27 mariabackup: Generating a list of tablespaces
.....
.....
[00] 2021-08-03 16:14:30         ...done
[00] 2021-08-03 16:14:30 Writing xtrabackup_info
[00] 2021-08-03 16:14:30         ...done
[00] 2021-08-03 16:14:30 Redo log (from LSN 1640838 to 1640847) was copied.
[00] 2021-08-03 16:14:30 completed OK!

[root@www ~]#

ll /home/mariadb_backup

total 12332
-rw-r-----. 1 root root    16384 Aug  3 16:14 aria_log.00000001
-rw-r-----. 1 root root       52 Aug  3 16:14 aria_log_control
-rw-r-----. 1 root root      324 Aug  3 16:14 backup-my.cnf
-rw-r-----. 1 root root     1022 Aug  3 16:14 ib_buffer_pool
-rw-r-----. 1 root root 12582912 Aug  3 16:14 ibdata1
-rw-r-----. 1 root root     2560 Aug  3 16:14 ib_logfile0
drwx------. 2 root root     4096 Aug  3 16:14 mysql
drwx------. 2 root root       20 Aug  3 16:14 performance_schema
drwx------. 2 root root       64 Aug  3 16:14 test_database
-rw-r-----. 1 root root       77 Aug  3 16:14 xtrabackup_checkpoints
-rw-r-----. 1 root root      446 Aug  3 16:14 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 root root 211333 Aug 3 16:22 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 10.3.28-MariaDB Linux (x86_64)
[00] 2021-08-03 16:23:30 cd to /root/mariadb_backup/
[00] 2021-08-03 16:23:30 open files limit requested 0, set to 1024
[00] 2021-08-03 16:23:30 This target seems to be not prepared yet.
[00] 2021-08-03 16:23:30 mariabackup: using the following InnoDB configuration for recovery:
[00] 2021-08-03 16:23:30 innodb_data_home_dir = .
[00] 2021-08-03 16:23:30 innodb_data_file_path = ibdata1:12M:autoextend
[00] 2021-08-03 16:23:30 innodb_log_group_home_dir = .
[00] 2021-08-03 16:23:30 InnoDB: Using Linux native AIO
[00] 2021-08-03 16:23:30 Starting InnoDB instance for recovery.
[00] 2021-08-03 16:23:30 mariabackup: Using 104857600 bytes for buffer pool (set by --use-memory parameter)
2021-08-03 16:23:30 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2021-08-03 16:23:30 0 [Note] InnoDB: Uses event mutexes
2021-08-03 16:23:30 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2021-08-03 16:23:30 0 [Note] InnoDB: Number of pools: 1
2021-08-03 16:23:30 0 [Note] InnoDB: Using SSE2 crc32 instructions
2021-08-03 16:23:30 0 [Note] InnoDB: Initializing buffer pool, total size = 100M, instances = 1, chunk size = 100M
2021-08-03 16:23:30 0 [Note] InnoDB: Completed initialization of buffer pool
2021-08-03 16:23:30 0 [Note] InnoDB: page_cleaner coordinator priority: -20
2021-08-03 16:23:30 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=1640838
[00] 2021-08-03 16:23:30 Last binlog file , position 0
[00] 2021-08-03 16:23:30 completed OK!

# リストア実行

[root@node01 ~]#

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

mariabackup based on MariaDB server 10.3.28-MariaDB Linux (x86_64)
[01] 2021-08-03 16:23:46 Copying ibdata1 to /var/lib/mysql/ibdata1
[01] 2021-08-03 16:23:46         ...done
[01] 2021-08-03 16:23:46 Copying ./mysql/innodb_table_stats.ibd to /var/lib/mysql/mysql/innodb_table_stats.ibd
[01] 2021-08-03 16:23:46         ...done
[01] 2021-08-03 16:23:46 Copying ./mysql/innodb_index_stats.ibd to /var/lib/mysql/mysql/innodb_index_stats.ibd
[01] 2021-08-03 16:23:46         ...done
.....
.....
[01] 2021-08-03 16:23:46         ...done
[01] 2021-08-03 16:23:46 Copying ./ib_buffer_pool to /var/lib/mysql/ib_buffer_pool
[01] 2021-08-03 16:23:46         ...done
[01] 2021-08-03 16:23:46 Copying ./xtrabackup_info to /var/lib/mysql/xtrabackup_info
[01] 2021-08-03 16:23:46         ...done
[00] 2021-08-03 16:23:46 completed OK!

[root@node01 ~]#

chown -R mysql. /var/lib/mysql

[root@node01 ~]#

systemctl start mariadb