[3] MariaDB – Backup

Możliwe jest wykonywanie kopii zapasowych oraz ich odtworzenie za pomocą [mariabackup].

[1] Domyślnie [mariabackup] jest instalowana jako pakiety zależne do instalacji serwera MariaDB. Jednak jeśli nie została zainstalowana zainstaluj ją najpierw.

[root@vlsr01 ~]# dnf -y install mariadb-backup

[2] Uruchom backup. W tym przykładzie kopia będzie wykonana do katalogu [/home/maria_backup].

[root@vlsr01 ~]# mkdir /home/mariadb_backup
[root@vlsr01 ~]# mariabackup --backup --target-dir /home/mariadb_backup -u root
[00] 2022-01-26 18:25:15 Connecting to MySQL server host: localhost, user: root, password: not set, port: not set, socket: not set
[00] 2022-01-26 18:25:15 Using server version 10.5.9-MariaDB
mariabackup based on MariaDB server 10.5.9-MariaDB Linux (x86_64)
[00] 2022-01-26 18:25:17 Writing xtrabackup_info
[00] 2022-01-26 18:25:17         ...done
[00] 2022-01-26 18:25:17 Redo log (from LSN 951569 to 951581) was copied.
[00] 2022-01-26 18:25:17 completed OK!

[root@vlsr01 ~]# ll /home/mariadb_backup/
razem 12352
-rw-r-----. 1 root root    32768 01-26 18:25 aria_log.00000001
-rw-r-----. 1 root root       52 01-26 18:25 aria_log_control
-rw-r-----. 1 root root      297 01-26 18:25 backup-my.cnf
-rw-r-----. 1 root root     2193 01-26 18:25 ib_buffer_pool
-rw-r-----. 1 root root 12582912 01-26 18:25 ibdata1
-rw-r-----. 1 root root     2560 01-26 18:25 ib_logfile0
drwx------. 2 root root     4096 01-26 18:25 mysql
drwx------. 2 root root       20 01-26 18:25 performance_schema
drwx------. 2 root root      182 01-26 18:25 SampleApp_development
drwx------. 2 root root       20 01-26 18:25 SampleApp_test
drwx------. 2 root root     4096 01-26 18:25 wordpress
-rw-r-----. 1 root root       75 01-26 18:25 xtrabackup_checkpoints
-rw-r-----. 1 root root      430 01-26 18:25 xtrabackup_info

#skompresuj wszystkie pliki do jednego archiwum
[root@vlsr01 home]# tar -czvf mariadb_backup.tar.gz mariadb_backup

[3] Aby przywrócić dane z kopii zapasowej na innym hoście, wykonaj następujące czynności. Przed przywróceniem przenieś dane kopii zapasowej na host docelowy za pomocą [rsync] lub [scp] lub w jakikolwiek inny sposób.

#zatrzymaj MariaDB i usuń wszystkie dane
[root@vlsr02 ~]# systemctl stop mariadb
[root@vlsr02 ~]# rm -rf /var/lib/mysql/*

#przetransportowany backup
[root@vlsr02 ~]# ll mariadb_backup.tar.gz
-rw-r--r--. 1 root root 514803 01-26 20:03 mariadb_backup.tar.gz
[root@vlsr02 ~]# tar zxvf mariadb_backup.tar.gz

#uruchom przygotowanie do odtworzenia danych: OK gdy pokaże się [completed OK]
[root@vlsr02 ~]# mariabackup --prepare --target-dir /root/mariadb_backup
mariabackup based on MariaDB server 10.5.9-MariaDB Linux (x86_64)
[00] 2022-01-26 20:10:24 cd to /root/mariadb_backup/
[00] 2022-01-26 20:10:24 open files limit requested 0, set to 1024
[00] 2022-01-26 20:10:24 This target seems to be not prepared yet.
[00] 2022-01-26 20:10:24 mariabackup: using the following InnoDB configuration for recovery:
[00] 2022-01-26 20:10:24 innodb_data_home_dir = .
[00] 2022-01-26 20:10:24 innodb_data_file_path = ibdata1:12M:autoextend
[00] 2022-01-26 20:10:24 innodb_log_group_home_dir = .
[00] 2022-01-26 20:10:24 InnoDB: Using Linux native AIO
[00] 2022-01-26 20:10:24 Starting InnoDB instance for recovery.
[00] 2022-01-26 20:10:24 mariabackup: Using 104857600 bytes for buffer pool (set by --use-memory parameter)
2022-01-26 20:10:24 0 [Note] InnoDB: Uses event mutexes
2022-01-26 20:10:24 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2022-01-26 20:10:24 0 [Note] InnoDB: Number of pools: 1
2022-01-26 20:10:24 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions
2022-01-26 20:10:24 0 [Note] InnoDB: Using Linux native AIO
2022-01-26 20:10:24 0 [Note] InnoDB: Initializing buffer pool, total size = 104857600, chunk size = 104857600
2022-01-26 20:10:24 0 [Note] InnoDB: Completed initialization of buffer pool
2022-01-26 20:10:24 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=951569,951569
[00] 2022-01-26 20:10:24 Last binlog file , position 0
[00] 2022-01-26 20:10:24 completed OK!

#uruchom odtworzenie
[root@vlsr02 ~]# mariabackup --copy-back --target-dir /root/mariadb_backup
mariabackup based on MariaDB server 10.5.9-MariaDB Linux (x86_64)
[01] 2022-01-26 20:11:23 Copying ibdata1 to /var/lib/mysql/ibdata1
. . . . .
[01] 2022-01-26 20:11:24         ...done
[00] 2022-01-26 20:11:24 completed OK!

[root@vlsr02 ~]# chown -R mysql. /var/lib/mysql
[root@vlsr02 ~]# systemctl restart mariadb
[root@vlsr02 ~]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 3
Server version: 10.5.9-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases;
+-----------------------+
| Database              |
+-----------------------+
| SampleApp_development |
| SampleApp_test        |
| information_schema    |
| mysql                 |
| performance_schema    |
| wordpress             |
+-----------------------+
6 rows in set (0.000 sec)