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Wednesday, 27 September 2017

Add Docker registry mirror to Docker daemon on systemd (Ubuntu 16.04)

What Docker registry is

The Registry is a stateless, highly scalable server side application that stores and lets you distribute Docker images. The Registry is open-source, under the permissive Apache license.

Why use it

You should use the Registry if you want to:
  • tightly control where your images are being stored
  • fully own your images distribution pipeline
  • integrate image storage and distribution tightly into your in-house development workflow

Set up a registry proxy cache with Docker open source registry

Configure Docker registry mirror with systemd

Many Linux distributions use systemd to start the Docker daemon. In this post we learn configure Docker registry mirror with systemd.
  • Edit docker.service systemd unit:
$ sudo systemctl edit docker.service
This create a file in /etc/systemd/system/docker.service.d/ folder with name like .override.conf and open it with default text editor
Thanks 
fzerorubigd for introducing systemctl edit
  • In the file, add this lines
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H fd:// --registry-mirror=https://example.com:5000
  • Flush the change with:
$ sudo systemctl daemon-reload
  • Restart Docker with:
$ sudo systemctl restart docker
  • Check if the change is successfully applied with $ systemctl status docker, your config should appear somewhere in the command output.
from https://medium.com/@arastu/add-docker-registry-mirror-to-docker-daemon-on-systemd-ubuntu-16-04-d9a224be4d86

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