Master

Host : Ubuntu 16.04
IP Address : 10.10.10.22
Database : Percona XtraDB Cluster 5.7
Backup Tool : Percona xtrabackup version 2.4

Backup and prepare

# Backup
$ sudo xtrabackup --backup \
  --user=xtrabackup_usr \
  --password=xtrabackup_passwd \
  --target-dir=/opt/perconaXtraBackup/xtrabackup_dir/
    ...
    innobackupex: completed OK!

# Prepare
$ sudo xtrabackup --user=xtrabackup_usr \
  --password=xtrabackup_passwd \
  --apply-log /opt/perconaXtraBackup/xtrabackup_dir/
    ...
    InnoDB: Shutdown completed; log sequence number 39984943813
    160128 12:41:38 completed OK

Rsync data to slave

slave:

# Create backup dir
$ sudo mkdir /opt/perconaXtraBackup
$ sudo chown -R ubuntu:ubuntu /opt/perconaXtraBackup

master:

# rsync to slave
$ sudo rsync -avpP -e ssh /opt/perconaXtraBackup/xtrabackup_dir/ \
ubuntu@10.10.10.210:/opt/perconaXtraBackup/

Replication user & Grant access

mysql> CREATE USER 'repl'@'10.10.10.210' IDENTIFIED BY 'repl_password';
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'10.10.10.210';
mysql> FLUSH PRIVILEGES;

Slave

Host : Ubuntu 18.04
IP Address : 10.10.10.210
Database : MariaDB 10.2

In MariaDB 10.2, Percona XtraBackup 2.4 is supported in some cases if InnoDB page compression is not used, and if data at rest encryption is not used, and if innodb_page_size is set to 16k.

Install MariaDB 10.2 on Ubuntu 18.04 LTS

1. Configure the APT package repository.

$ wget https://downloads.mariadb.com/MariaDB/mariadb_repo_setup

$ echo "32e01fbe65b4cecc074e19f04c719d1a600e314236c3bb40d91e555b7a2abbfc mariadb_repo_setup" \
    | sha256sum -c -

    mariadb_repo_setup: OK

$ chmod +x mariadb_repo_setup

$ sudo ./mariadb_repo_setup \
   --mariadb-server-version="mariadb-10.2"

   [info] Checking for script prerequisites.
   [info] Repository file successfully written to /etc/apt/sources.list.d/mariadb.list
   [info] Adding trusted package signing keys...
   [info] Running apt-get update...
   [info] Done adding trusted package signing keys

1. Install MariaDB Community Server and package dependencies:

$ sudo apt install mariadb-server mariadb-backup-10.2

  Reading package lists... Done
  Building dependency tree
  ...
  After this operation, 205 MB of additional disk space will be used.
  Do you want to continue? [Y/n] Y

Import the data

# Stop service
$ sudo service mysql stop

# Back up the original
$ sudo mkdir /tmp/mysql
$ sudo mv /var/lib/mysql/* /tmp/mysql/

# Move snapshot
$ sudo mv /opt/perconaXtraBackup/* /var/lib/mysql/

# Change permissions
$ sudo  chown mysql:mysql /var/lib/mysql

Configure my.cnf.

[mysqld]
# The server id is a unique number for each MariaDB/MySQL server in your network.
server-id               = 10218

Setup Slave

# Start service
$ sudo service mysql start

# Finding the binary log position
$ sudo cat /var/lib/mysql/xtrabackup_binlog_info
percona1022-bin.000202	989027851	28a606b1-2ce7-11e8-98cd-1c98ec1359d0:1-2,
59ef0c21-bbbf-ee18-7c28-c5c7f4aa2346:1-278889045

master_log_file : percona1022-bin.000202

master_log_pos : 989027851

mysql> STOP SLAVE;

mysql> CHANGE MASTER TO
    MASTER_HOST ='10.10.10.21',
    MASTER_USER ='repl',
    MASTER_PASSWORD ='repl_password',
    MASTER_LOG_FILE = 'percona1022-bin.000202',
    MASTER_LOG_POS = 989027851;

mysql> START SLAVE;

mysql> SHOW SLAVE STATUS \G
         ...
         Slave_IO_Running: Yes
         Slave_SQL_Running: Yes
         ...

GTID

Percona XtraDB Cluster 5.7 does not support MariaDB global transaction id.

Master gtid variables*

show global variables like '%gtid%';
+----------------------------------+-----------------------------------+
| Variable_name                    | Value                             |
+----------------------------------+-----------------------------------+
| binlog_gtid_simple_recovery      | ON                                |
| enforce_gtid_consistency         | ON                                |
...
| gtid_executed_compression_period | 1000                              |
| gtid_mode                        | ON                                |
...
| session_track_gtids              | OFF                               |
+----------------------------------+-----------------------------------+

Testing CHANGE MASTER TO master_use_gtid = current_pos; get error

Last_IO_Error: The slave I/O thread stops because master does not support MariaDB global transaction id. A fatal error is encountered when it tries to SELECT @@GLOBAL.gtid_domain_id. Error: Unknown system variable 'gtid_domain_id'