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TencentDB for MariaDB
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    Restoring Instances from Backup Files

    Last updated: 2024-01-11 15:28:38
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      You can view historical data by using the rollback feature of TencentDB for MariaDB. To restore your database instance locally, you can do so by following the instructions below.

      Prerequisites

      Preparing a server

      To restore the database instance locally, ensure that the basic configuration of the server meets the following requirements:
      CPU: 2 or more cores.
      Memory: 4 GB or above.
      Disk capacity: It must be greater than the used space of the database and leave enough temporary space for the system.
      Operating system: CentOS

      Preparing a database

      Note:
      The version of the local database must be the same as that of the TencentDB instance.
      Take installation of MariaDB 10.0.10 as an example:
      1. Add the yum source.
      vi /etc/yum.repos.d/mariadb-10.0.10.repo):
      # MariaDB 10.0 CentOS repository list - created 2016-05-30 02:16 UTC
      # http://downloads.mariadb.org/mariadb/repositories/
      [mariadb]
      name = MariaDB
      # baseurl = http://yum.mariadb.org/10.0/centos7-amd64
      baseurl = http://archive.mariadb.org/mariadb-10.0.10/yum/centos6-amd64/
      gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
      gpgcheck=0
      2. Check whether the version of the MariaDB instance corresponding to the yum source is 10.0.10.
      yum makecache
      yum info MariaDB-server
      3. Install MariaDB-server.
      yum install MariaDB-server
      Note:
      If the system prompts a conflict with a legacy version, you need to remove the previously installed package, such asyum remove mariadb-libs.

      Installing the auxiliary tool

      1. Install the MariaDB client
      yum install MariaDB-client
      2. Install the LZ4 decompression software. For more information, see [Decompressing Backups and Logs] (https://www.tencentcloud.com/document/product/237/2088). LZ4 is installed in the mysqlagent/bin directory by default. You can also install it in the /usr/bin directory and import it as an environment variable.
      yum install -y lz4
      percona-xtrabackup
      yum install http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm
      yum install percona-xtrabackup

      Downloading a backup

      In the TencentDB for MariaDB console, click an instance ID to enter the instance management page, and get the backup download address on the Backup and Restoration tab. Sample download command:
      wget  --content-disposition 'http://1x.2xx.0.27:8083/2/noshard1/set_1464144850_587/1464552298xxxxxxxx'

      Restoring Databases from Backup Files (Unencrypted)

      1. Enter the cold backup file download directory and decompress the file with LZ4

      lz4 -d set_1464144850_587.1464552298.xtrabackup.lz4

      2. Decompress the file to a temporary directory xtrabackuptmp with xbstream

      mkdir xtrabackuptmp/
      mv set_1464144850_587.1464552298.xtrabackup xtrabackuptmp/
      xbstream -x < set_1464144850_587.1464552298.xtrabackup
      After the decompression, the directories and files are as shown below:
      
      

      3. Use innobackupex to apply logs

      mkdir /root/dblogs_tmp
      innobackupex --apply-log  --use-memory=1G --tmpdir='/root/dblogs_tmp/' /root/xtrabackuptmp/
      After the operation succeeds, completed OK! will be displayed.
      
      

      4. Stop the database and clear data files

      service mysql stop
      Clear data files (in data directories, tablespace directories, and log directories):
      mkdir /var/lib/mysql-backup
      mv /var/lib/mysql/* /var/lib/mysql-backup

      5. Modify the database parameter file

      Modify the database parameter file (/etc/my.cnf.d/server.cnf). For specific parameter values, see parameters in the extracted backup-my.cnf file. Do not directly replace the parameter file with backup-my.cnf.
      [mysqld]
      skip-name-resolve
      datadir=/var/lib/mysql
      innodb_checksum_algorithm=innodb
      innodb_log_checksum_algorithm=innodb
      innodb_data_file_path=ibdata1:2G:autoextend
      innodb_log_files_in_group=4
      innodb_log_file_size=1073741824
      innodb_page_size=4096
      innodb_log_block_size=512
      innodb_undo_tablespaces=0

      6. Use innobackupex to load the image

      innobackupex --defaults-file=/etc/my.cnf --move-back /root/xtrabackuptmp/
      After loading succeeds, completed OK! will be displayed.
      
      

      7. Start the database

      chmod 777 -R /var/lib/mysql
      service start mysql
      If you fail to start the database, you need to check and fix the error, and then try again.

      8. Connect to the database to check data

      After starting the database, you may need to connect to the database with the original account and password to view data.

      Restoring Databases from Backup Files (Encrypted)

      TDE is only supported for Percona 5.7 in Hong Kong region and MySQL 8.0.24 , but it will be available to more kernel versions in the future. You can access Data Security > Data Encryption on the instance management page in the [TencentDB for MariaDB console] (https://console.tencentcloud.com/mariadb)
      After data encryption is enabled, the database instances can’t be restored from a backup file. It is recommended to restore them as instructed in [Rolling back Databases] (https://www.tencentcloud.com/document/product/237/8719).
      Note:
      To use the data encryption feature, [submit a ticket] (https://console.tencentcloud.com/workorder/category) to apply for it.
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