MySQL

Notes on moving MySQL (it was actually MariaDB on Debian) into a Docker container.

Back up databases

cd /green/BACKUPS/bellman_mysql for db in mysql asterisk owncloud yaris; do mysqldump -u root $db > $db.sql; done

Dockerize

2017-08-27 today I created systemctl service for MySQL on bellman, see /lib/systemd/system/docker-mysql.service

Notes: The local hostname does not matter because we publish port 3306, so the mysql service just looks like it's running on localhost. The link created by "--link db" in owncloud uses the name and the service there will also appear on localhost port 3306

I am using the official mariadb docker, during testing I did this

docker run -d --hostname=db --name=db -p 3306:3306 \
-v /var/lib/mysql:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=SECRET mariadb:latest

I named it 'db' and gave it a hostname of 'db'. This allows linking with other databases by name and access from the host via the hostname and I can see it worked with

docker exec -it db mysql -u root -p mysql

select * from db;

I have to allow remote connections to the database so that asterisk can continue to use it. Likewise owncloud

GRANT SELECT,INSERT,UPDATE,DELETE ON asterisk.* to asterisk@'%' IDENTIFIED BY 'SECRET';
GRANT ALL ON owncloud.* to owncloud@'%' IDENTIFIED BY 'SECRET';
FLUSH PRIVILEGES;

You have to edit /etc/mysql/debian.cnf and my.cnf to change from connecting via a socket to protocol=tcp. You should be able to connect remotely with

mysql -u asterisk -p asterisk

You have to edit /etc/odbc.ini to add Protocol = TCP

After it's running then you can delete the server package from the host

apt-get remove mysql-server