Docker-compose script for simple data migration from MySQL 8.0 to MariaDB

[an3l]

• First commit structuralizes previous example
• To test the PR run following:

$ sudo rm -rf dump-data/ && mkdir dump-data && sudo chown -R 999:999 dump-data
$ docker compose -f compose-mysql8.0.yml down -v
[+] Running 2/0
 ✔ Volume migration-80_mysqldump  Removed                                                                                                                                                                  0.0s 
 ✔ Volume migration-80_dbdata     Removed 
$ docker compose -f compose-mysql8.0.yml up

• Check containers

$ docker ps
CONTAINER ID   IMAGE          COMMAND                  CREATED              STATUS                          PORTS                 NAMES
cbcdd1450304   mariadb:lts    "docker-entrypoint.s…"   About a minute ago   Up About a minute (healthy)     3306/tcp              mariadb-migrated-mysql8.0
a3c6dd61ad5c   mariadb:lts    "docker-entrypoint.s…"   About a minute ago   Up About a minute (healthy)     3306/tcp              mariadb-container-dump
cc8c028ddca4   mysql:8.3.0    "docker-entrypoint.s…"   About a minute ago   Up About a minute (healthy)     3306/tcp, 33060/tcp   mysql-container

• Check logs during services startup

# Dumping files
mariadb-container-dump     | 2024-02-19 13:13:12+00:00 [Note] [Entrypoint]: /usr/local/bin/docker-entrypoint.sh: running /docker-entrypoint-initdb.d/dump-mysql.sh
mariadb-container-dump     | MariaDB service started.
mariadb-container-dump     | mysql
mariadb-container-dump     | Remove files if exist
mariadb-container-dump     | Dump and compress MySQL data with changed collation ...
mariadb-container-dump     | Dump and compress MySQL users ...
mariadb-container-dump     | Dump and compress MySQL stats ...
mariadb-container-dump     | Dump and compress MySQL timezones 

# Migrated container
mariadb-migrated-mysql8.0  | 2024-02-19 13:13:33+00:00 [Note] [Entrypoint]: /usr/local/bin/docker-entrypoint.sh: sourcing /docker-entrypoint-initdb.d/migrate-mariadb.sh
mariadb-migrated-mysql8.0  | Extract file
/etc/dump/mysql-dump-data.sql.zst: 1894 bytes                                  
mariadb-migrated-mysql8.0  | Show data in MariaDB
mariadb-migrated-mysql8.0  | Database
mariadb-migrated-mysql8.0  | information_schema
mariadb-migrated-mysql8.0  | mysql
mariadb-migrated-mysql8.0  | performance_schema
mariadb-migrated-mysql8.0  | sys
mariadb-migrated-mysql8.0  | testdb
mariadb-migrated-mysql8.0  | name
mariadb-migrated-mysql8.0  | Bosnia & Herzegovina

• Or if one wants to check on CLI

# Source of data MySQL 8.0
$ docker exec -it mysql-container mysql -uroot -psecret -e "select * from testdb.countries"
mysql: [Warning] Using a password on the command line interface can be insecure.
+----------------------+
| name                 |
+----------------------+
| Bosnia & Herzegovina |
+----------------------+

# Migrated data to MariaDB
$ docker exec -it mariadb-migrated-mysql8.0 mariadb -uroot -psecret -e "select * from testdb.countries"
+----------------------+
| name                 |
+----------------------+
| Bosnia & Herzegovina |
+----------------------+