Select Page

Cleanup your Docker Environment

by | Jul 25, 2019 | DevOps, Container

Using Docker is pretty common meanwhile and a very good idea for development. Using many versions of your favourite language without messing up your host system, different types of deployments (e.g. web servers) or just testing production environment without operational support. The only drawback is that normally you don’t have a clue what’s going on behind the scenes. If you run out of disk space for the first time, you’re exactly at that point.

To apply first aid, you will be advised to use some curious cli hacks to clean up your system. Breaking fingers between grep, sed and awk works out well but is not very helpful – Especially if you want to remember what you did 3 months before ūüėČ

Since Docker Api version 1.25 you have a couple of high level cli commands available doing exactly this job:

Minimal Cheat Sheet:

[bash light=”false”]
$ # Claimed disk space
$ docker system df
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 59 5 10.74GB 9.038GB (84%)
Containers 6 1 991kB 991kB (99%)
Local Volumes 216 1 5.876GB 5.876GB (100%)
Build Cache 0 0 0B 0B

$ # Cleanup disk space
$ 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:
02401e1555e8e752d36198d982b5e4114d0999c7cca34a2353e8dc332faa4db5
997eac76d4a46515797027103967c61b46219ff8c70f6e0bb39bc2b975297fa5
23983ed8abaa60198b497e4b3788bb6de7d39d03f171f43e4ee865c0df318ab8
65bb90b9e7edcd2d13da3129664f8b74a72b011d56136cb28c687f1f8dd8e473
5218788bff77cc0c0cc03f79888ea61c3e27bf3ef0003e41fc231b8b6ecdcdc2

Deleted Images:
deleted: sha256:dccdc3cf7d581b80665bad309b66ba36d88219829e1ade951912dc122b657bfc
[…]
[/bash]

There is also an equivalent for images only:

[bash light=”false”]
$ docker image prune
[/bash]

You should definitely take a deeper look into the CLI commands. There are a lot of things that helps you to solve your every day problems!

Marius Hein
Marius Hein
Head of ITSM

Marius Hein ist schon seit 2003 bei NETWAYS. Er hat hier seine Ausbildung zum Fachinformatiker absolviert und viele Jahre in der Softwareentwicklung gearbeitet. Mittlerweile ist er Herr √ľber die interne IT und als Leiter von ITSM zust√§ndig f√ľr die technische Schnittmenge der Abteilungen der NETWAYS Gruppe. Wenn er nicht gerade IPv6 IPSec Tunnel bohrt, sitzt er daheim am Schlagzeug und treibt seine Nachbarn in den Wahnsinn.

0 Comments

Submit a Comment

Your email address will not be published. Required fields are marked *

More posts on the topic DevOps | Container

NWS-ID for your Managed Kubernetes!

First Cloud, now Kubernetes - the integration of NWS-ID with our portfolio continues! As a next step, we will merge your Managed Kubernetes clusters with NWS-ID. Credit goes to Justin for extending our cluster stack with OpenID-Connect (OIDC), the base for NWS-ID! How...

Sommer, Sonne, Software – R√ľckblick CIVO NAVIGATE 2023

Anfang Februar durfte ich nach Tampa, Florida reisen, um auf der IT-Konferenz Civo Navigate zu sprechen, die in diesem Rahmen zum ersten Mal stattfand. Mit Beiträgen rund um Kubernetes, Edge Computing, Machine Learning, DevOps, GitOps, Observability, Security und...