How could I list the images pushed to microk8s built-in registry

Question

I installed microk8s and I enabled registry addon I am able to push docker images to this registry and I am able to use this images in deployments.

But I'm trying to list images that was already pushed to this registry. How can I do that? Is there an API for that?

Arghya Sadhu · Answer 1 · 2020-05-20T15:04:25.740

12

Use command microk8s ctr images list. To know more use --help

microk8s ctr images --help
NAME:
   ctr images - manage images

USAGE:
   ctr images command [command options] [arguments...]

COMMANDS:
     check       check that an image has all content available locally
     export      export an image
     import      import images
     list, ls    list images known to containerd
     pull        pull an image from a remote
     push        push an image to a remote
     remove, rm  remove one or more images by reference
     label       set and clear labels for an image

OPTIONS:
   --help, -h  show help

edited May 20 '20 at 15:04

answered May 19 '20 at 05:15

Arghya Sadhu

41,002
9
78
107

2

I get the following response when I run this command: "Cannot use two forms of the same flag: n namespace" – EduMelo May 20 '20 at 14:49
2

That returned a lot of information, but I cannot identify the images that were displayed. It returned their sha256 digest wich is not useful – EduMelo May 20 '20 at 15:39
2

I am looking for the image's name and its tags – EduMelo May 20 '20 at 21:50
I am getting only the cached images with this command. I know for a fact that there are other images on the registry that I cannot see here. Only after Kubernetes starts a pod with on of the images in the registry, that image appears in the list with this command. – Ouss Jun 21 '22 at 13:20
Please keep in mind that the Docker REGISTRY and the images hosted in CONTAINERD are distinct things. – Raúl Salinas-Monteagudo Jun 19 '23 at 11:01

score 12 · Accepted Answer · edited Sep 17 '21 at 15:11

12

I found that it's possible to list the registry images via HTTP GET in this address: http://<host_ip>:32000/v2/_catalog

It'll return the images in a json response

edited Sep 17 '21 at 15:11

tangens

39,095
19
120
139

answered May 20 '20 at 22:06

EduMelo

455
3
15

score 6 · Answer 3 · answered Oct 20 '20 at 13:55

Following REST APIs will do the job:

Listing repositories:

http://host:32000/v2/_catalog?n=10

Last parameter n is the size of records to be returned. One can skip passing it but if you expect a long list then it's better to use pagination.

Listing the images in the repository

http://host:32000/v2/repositoryName/tags/list?n=10

Note: Replace host and repositoryName accordingly.

For complete reference visit: https://docs.docker.com/registry/spec/api/#listing-repositories

score 4 · Answer 4 · edited May 19 '20 at 10:58

4

Try this:

microk8s ctr images ls

edited May 19 '20 at 10:58

Ardent Coder

3,777
9
27
53

answered May 19 '20 at 04:05

JaskiratSra

112
2

2

That returned a lot of information, but I cannot identify the images that were displayed. It returned their sha256 digest wich is not useful – EduMelo May 20 '20 at 14:53

score 1 · Answer 5 · answered Feb 16 '23 at 10:26

1

microk8s.ctr images ls

Run this to get your images. This is if you had installed microk8s as a snap. I'm using it on Ubuntu Core.

answered Feb 16 '23 at 10:26

theBird

31
3

How could I list the images pushed to microk8s built-in registry

5 Answers5