How to get a list of images on docker registry v2

Question

I m using docker registry v1 and I m interested in migrating to the newer version  v2  But I need some way to get a list of images present on registry  for example with registry v1 I can execute a GET request to http   myregistry 5000 v1 search  and the result is        num results   2     query          results                  description              name    deis router                      description              name    deis database                But I can t find on official documentation something similar to get a list of image on registry  Anybody knows a way to do it on new version v2

User · Answer

you can search on      http    lt ip hostname gt   lt port gt  v2  catalog

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I wrote an easy-to-use command line tool for listing images in various ways  like list all images  list all tags of those images  list all layers of those tags    It also allows you to delete unused images in various ways  like delete only older tags of a single image or from all images etc  This is convenient when you are filling your registry from a CI server and want to keep only latest stable versions   It is written in python and does not need you to download bulky big custom registry images

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Here s an example that lists all tags of all images on the registry  It handles a registry configured for HTTP Basic auth too   THE REGISTRY localhost 5000    Get username password from docker configuration  You could   inject these some other way instead if you wanted  CREDS   jq -r      auths       THE REGISTRY      auth      docker config json   base64 -d   curl -s --user  CREDS https    THE REGISTRY v2  catalog         jq -r     repositories              xargs -I  REPO  curl -s --user  CREDS https    THE REGISTRY v2  REPO  tags list         jq -M     name              tags        Explanation    extract username password from  docker config json make a https request to the registry to list all  repositories  filter the json result to a flat list of repository names for each repository name  make a https request to the registry to list all  tags  for that  repository  filter the stream of result json objects  printing  repository   tag  pairs for each tag found in each repository

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Using   v2  catalog  and   tags list  endpoints you can t really list all the images  If you pushed a few different images and tagged them  latest  you can t really list the old images  You can still pull them if you refer to them using digest  docker pull ubuntu sha256 ac13c5d2      So the answer is - there is no way to list images you can only list tags which is not the same

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Since each registry runs as a container the container ID has an associated log file ID-json log this log file contains the vars name  image  and vars reference  tag   A script can be used to extrapolate and print these  This is perhaps one method to list images pushed to registry V2-2 0 1

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I had to do the same here and the above works except I had to provide login details as it was a local docker repository   It is as per the above but with supplying the username password in the URL   curl -k -X GET https   yourusername yourpassword theregistryURL v2  catalog   It comes back as unformatted JSON   I piped it through the python formatter for ease of human reading  in case you would like to have it in this format   curl -k -X GET https   yourusername yourpassword theregistryURL v2  catalog   python -m json tool

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The latest version of Docker Registry available from https   github com docker distribution supports Catalog API   v2  catalog   This allows for capability to search repositories  If interested  you can try docker image registry CLI I built to make it easy for using the search features in the new Docker Registry distribution  https   github com vivekjuneja docker registry cli

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We wrote a CLI tool for this purpose  docker-ls It allows you to browse a docker registry and supports authentication via token or basic auth

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Here is a nice little one liner  uses JQ  to print out a list of Repos and associated tags   If you dont have jq installed you can use  brew install jq    This is my URL but you can use any REPO URL 10 230 47 94 443  curl -k -s -X GET https    REPO URL v2  catalog      jq   repositories         sort      xargs -I   curl -s -k -X GET https    REPO URL v2   tags list

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For the latest  as of 2015-07-31  version of Registry V2  you can get this image from DockerHub   docker pull distribution registry master   List all repositories  effectively images    curl -X GET https   myregistry 5000 v2  catalog  gt    repositories    redis   ubuntu      List all tags for a repository   curl -X GET https   myregistry 5000 v2 ubuntu tags list  gt    name   ubuntu   tags    14 04

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Install registry 2 1 1 or later  you can check the last one  here  and use GET  v2  catalog to get list    https   github com docker distribution blob master docs spec api md listing-repositories  Lista all images by Shell script example  https   gist github com OndrejP a2386d08e5308b0776c0

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This has been driving me crazy  but I finally put all the pieces together  As of 1 25 2015  I ve confirmed that it is possible to list the images in the docker V2 registry   exactly as  jonatan mentioned  above     I would up-vote that answer  if I had the rep for it   Instead  I ll expand on the answer  Since registry V2 is made with security in mind  I think it s appropriate to include how to set it up with a self signed cert  and run the container with that cert in order that an https call can be made to it with that cert   This is the script I actually use to start the registry   sudo docker stop registry sudo docker rm -v registry sudo docker run -d     -p 5001 5001     -p 5000 5000     --restart always     --name registry     -v  data registry  var lib registry     -v  root certs  certs     -e REGISTRY HTTP TLS CERTIFICATE  certs domain crt     -e REGISTRY HTTP TLS KEY  certs domain key      -e REGISTRY HTTP DEBUG ADDR   5001      registry 2 2 1   This may be obvious to some  but I always get mixed up with keys and certs  The file that needs to be referenced to make the call  jonaton mentions above    is the domain crt listed above    Since I put domain crt in  root  I made a copy into the user directory where it could be accessed      curl --cacert   domain crt https   myregistry 5000 v2  catalog  gt    repositories    redis   ubuntu        The command above has been changed  -X GET didn t actually work when I tried it   Note  https   myregistry 5000   as above   must match the domain given to the cert generated

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Get catalogs  Default  registry api return 100 entries of catalog  there is the code   When you curl the registry api   curl --cacert domain crt https   your registry 5000 v2  catalog  it equivalents with   curl --cacert domain crt https   your registry 5000 v2  catalog n 100  This is a pagination methond   When the sum of entries beyond 100  you can do in two ways   First  give a bigger number  curl --cacert domain crt https   your registry 5000 v2  catalog n 2000  Sencond  parse the next linker url  curl --cacert domain crt https   your registry 5000 v2  catalog  A link element contained in response header   curl --cacert domain crt https   your registry 5000 v2  catalog  response header   Link   lt  v2  catalog last pro-octopus-ws amp n 100 gt   rel  next   The link element have the last entry of this request  then you can request the next  page    curl --cacert domain crt https   your registry 5000 v2  catalog last pro-octopus-ws  If the response header contains link element  you can do it in a loop   Get Images  When you get the result of catalog  it like follows         repositories            busybox          ceph mds          you can get the images in every catalog   curl --cacert domain crt https   your registry 5000 v2 busybox tags list  returns     name   busybox   tags    latest

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Docker search registry v2 functionality is currently not supported at the time of this writing  See discussion since Feb 2015   quot propose registry search functionality  206 quot  https   github com docker distribution issues 206 I wrote a script  view-private-registry  that you can find  https   github com BradleyA Search-docker-registry-v2-script 1 0 It is not pretty but it gets the information needed from the private registry  Example of output from view-private-registry    view-private-registry  busybox latest gcr io google containers etcd 2 0 9 gcr io google containers hyperkube v0 21 2 gcr io google containers pause 0 8 0 google cadvisor latest jenkins latest logstash latest mongo latest nginx latest python 2 7 redis latest registry 2 1 1 stackengine controller latest tomcat 7 tomcat latest ubuntu 14 04 2 Number of images    16 Disk space used     1 7G     mnt three docker-registry registry-data

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This threads dates back a long time  the most recents tools that one should consider are skopeo and crane   skopeo supports signing and has many other features  while crane is a bit more minimalistic and I found it easier to integrate with in a simple shell script

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If some on get this far    Taking what others have already said above  Here is a one-liner that puts the answer into a text file formatted  json    curl  http   mydocker registry domain v2  catalog n 2000    jq   -  gt   tmp registry lst   This looks like       repositories          somerepo somecontiner        somerepo other someothercontiner                You might need to change the   n xxxx  to match how many containers you have   Next is a way to automatically remove old and unused containers

[docker] How to get a list of images on docker registry v2

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