Only the Mail Ports Went Quiet
From home, every mail port ran into a timeout while HTTPS on the same host answered normally. The cause was a second [DEFAULT] ignoreip in jail.d that replaces FAIL2BAN_IGNOREIP from docker-mailserver.
· 6 min
Category
Infrastructure
Operations, deployment, and everything underneath: Docker Swarm, CI/CD, networking, monitoring, and the outages we learned from.
Back to all posts
Special vdev: 113 TB hanging on two files
The special vdev of a 113 TB pool sat on two qcow2 files – both on the same consumer SSD, with 11% of its endurance left. Moving it meant operating on a live mirror with no room to be wrong. And it surfaced two checks that had been pointed at the wrong thing the whole time.
· 9 min
Observability: the read model that acts
Workbench could drop its database and rebuild it. This one polls Graylog and files GitLab issues – and a side effect has no upstream. Why dry-run became a database column, why the dashboard has no delete button, and why the safety guard sits at the HTTP boundary rather than in configuration.
· 6 min