This is a story about the struggles of adding a single iptables rule to ansible, which led to a night of insomnia and a series of incorrect assumptions about the root cause. While it’s uncommon to create a post mortem for a side-project cluster, I hope that sharing my experience will help others avoid making similar mistakes. I’ve also included all log and error messages in case you encounter similar issues. more...
Simple if you know how to do it: Preventing Docker (Swarm) from opening ports to the outer world on Debian by overwriting the Docker network magic using iptables and nftables. more...
Note to myself: do not delete your docker swarm cluster when using docker secrets for your docker based databases ;) - In case you do, you have to reset the passwords in the docker databases. more...
Do you need a non-blocking docker based backup solution for your MySQL or MariaDB container? Here it is, a simple to configure docker image which creates (incremental) backups of your database and rotates them automatically. more...