Docker Private Warehouse Management

The previous article said how to build a private warehouse, but after the warehouse was set up, it was not convenient to maintain the mirrors in the warehouse, Docker officially did not have a good command line interface to use, but provided APIs that could be used to view and remove mirrors by invoking these APIs, but these APIs are really hard to use, So I found out that there's an Open-source Python tool that can do that. installation

First download the latest Python script from the website below, just download the registry.py file. Https://github.com/andrey-pohilko/registry-cli

Installing a dependent third party package

$ sudo pip install requests

Configuration

To enable mirroring of the Docker warehouse to be deleted, you need to modify the warehouse configuration file, and on CentOS7 the profile path is:/etc/docker-distribution/registry/config.yml. Need to add in file

Storage: ...
    Delete:
        enabled:true

The modified file is similar to the following:

$ cat/etc/docker-distribution/registry/config.yml
version:0.1
log:
  fields:
    service:registry
Storage:
    cache:
        layerinfo:inmemory
    filesystem:
        rootdirectory:/var/lib/registry
    Delete:
        enabled:true
http:
    Addr: 5000

The warehouse service needs to be restarted after the modification is complete.

$ sudo systemctl restart Docker-distribution.service

Use

First look at what mirrors are in the warehouse

$ python registry.py-r http://localhost:5000

To test the need, we first create a few mirrors

$ sudo docker pull BusyBox

$ sudo docker tag busybox:latest localhost:5000/kongxx/busybox:v1
$ sudo docker push lo Calhost:5000/kongxx/busybox:v1

$ sudo docker tag busybox:latest localhost:5000/kongxx/busybox:v2
$ sudo Docker push Localhost:5000/kongxx/busybox:v2

$ sudo docker tag busybox:latest localhost:5000/kongxx/busybox:v3
$ sudo docker push Localhost:5000/kongxx/busybox:v3

Look at the mirrors in the warehouse again.

$ python registry.py-r http://localhost:5000
---------------------------------
Image:kongxx/mybusybox
  tag:v1
  tag:v2
  tag:v3
---------------------------------
Image: ...

You can see that there is already a three tag of a mirror. Now let's remove the mirrored tag

# Remove Mirror tag, but default will retain 10
$ python registry.py-r http://localhost:5000-i kongxx/busybox-d 

# Remove all tag $ for mirrors
Python registry.py-r http://localhost:5000-i kongxx/busybox--delete-all

# Remove Mirror tag, keep 1
$ python Registry.py-r http://localhost:5000-i kongxx/busybox-d--num 1

After removing all mirror tags, let's check that the mirror does not include any tag, but the mirror still exists

$ python registry.py-r http://localhost:5000
---------------------------------
Image:kongxx/busybox
  No tags!

To completely remove a mirror at this point, you can delete the mirrored directory in the following directory, which is defined in the/etc/docker-distribution/registry/config.yml file

/var/lib/registry/docker/registry/v2/repositories/<image>

Then run the Docker Warehouse command garbage-collect command to clean up.

$ sudo Registry garbage-collect/etc/docker-distribution/registry/config.yml