I recently upgraded MariaDB Docker image, and everything went well because everything worked. It was until I checked the logs:
...
2022-10-26 19:30:12 17 [ERROR] Incorrect definition of table mysql.column_stats: expected column 'histogram' at position 10 to have type longblob, found type varbinary(255).
2022-10-26 19:30:12 17 [ERROR] Incorrect definition of table mysql.column_stats: expected column 'hist_type' at position 9 to have type enum('SINGLE_PREC_HB','DOUBLE_PREC_HB','JSON_HB'), found type enum('SINGLE_PREC_HB','DOUBLE_PREC_HB').
...
I was confused, and then I found the fix I needed. Add this ENV variable to fix it:
MARIADB_AUTO_UPGRADE: '1'
for me it did fix the issue. Note:** Backup your data first!**
Read further if you want to learn what it does :)
I used mariadb:latest
image from official DockerHub
MARIADB_AUTO_UPGRADE explained
After quick checking, I found the explanation on GitHub repo here:
Set MARIADB_AUTO_UPGRADE to a non-empty value to have the entrypoint check whether mysql_upgrade/mariadb-upgrade needs to run, and if so, run the upgrade before starting the MariaDB server.
Before the upgrade, a backup of the system database is created in the top of the datadir with the name system_mysql_backup_*.sql.zst. This backup process can be disabled with by setting MARIADB_DISABLE_UPGRADE_BACKUP to a non-empty value.
What MARIADB_AUTO_UPGRADE actually does
The repository for the docker image is here
And here is a snippet of what it does (permalink to Maria DB 10.10)
mysql_note "Starting temporary server"
docker_temp_server_start "$@" --skip-grant-tables \
--loose-innodb_buffer_pool_dump_at_shutdown=0 \
--skip-slave-start
mysql_note "Temporary server started."
docker_mariadb_backup_system
mysql_note "Starting mariadb-upgrade"
mariadb-upgrade --upgrade-system-tables
mysql_note "Finished mariadb-upgrade"
mysql_note "Stopping temporary server"
docker_temp_server_stop
mysql_note "Temporary server stopped"
So as simple as it is, it does upgrade :)
Keep your data safe, do backup and test your backups! #peace
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