Thursday, July 2, 2020

Today I had some fun: my notebook computer didn’t restart. It remained hanging somewhere in the middle of the book process.

It took me some time to find out how to get into the rescue mode: hit ESC at startup to activate the BIOS menu. There select “continue” and hold ESC key again.

It then turned out that I had simply run out of disk space.

Okay my 20 years of private pictures and videos take 400 GB, but where is the rest? What is taking up so much of my terabyte?

I used sudo baobab in order to see. And voilà, the guilty was Docker. Or rather me, because I didn’t read their docs which say clearly: “Docker takes a conservative approach to cleaning up unused objects.” In /var/lib/docker/overlay there was another 250GB of data. Each getlino : the Lino installer test run creates two new virtual Linux machines. I simply said:

$ sudo docker system prune
WARNING! This will remove:
- all stopped containers
- all networks not used by at least one container
- all dangling images
- all dangling build cache

Are you sure you want to continue? [y/N] y
Deleted Containers:
8e00fae0c56985e8a6ed10b147b52c2ac769aca9e7164dae1e6155f9f57b370f
...
Deleted Images:
deleted: sha256:093ab511c463ec62911de1d6f24f07b6be8072f1c87778f539bfc9c8f29f13f8
...
Total reclaimed space: 201.7GB

Reviewed the Monitoring disk usage page.