Exercise 1.4 - Working with Docker Registry

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What it 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

Edit docker-storage-setup script. Add the following configuration lines of DEVS=dev/xvdb & VG=docker-vg to the /etc/sysconfig/docker-storage-setup file.

Docker storage setup
echo -e "DEVS=/dev/xvdb\nVG=docker-vg" >> /etc/sysconfig/docker-storage-setup
Install Registry
yum install –y docker-registry
Enable & Start
systemctl enable docker-registry
systemctl start docker-registry
Edit Registry (Uncomment and add)
vim /etc/sysconfig/docker

systemctl restart docker
View Current Images
docker images

REPOSITORY                        TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
fedora_postgresql                 latest              93e0fb06be2b        7 minutes ago       407.3 MB
docker.io/fedora                  latest              c7d2f0130dae        8 days ago          204.3 MB
registry.access.redhat.com/rhel   latest              c4f590bbcbe3        12 days ago         158.2 MB
Find AMI Public IP
PUBLIC_IP=$(curl -s
Tag fedora_postgresql
docker tag 93e0fb06be2b ${PUBLIC_IP}:5000/fedora_postgresql

Where 93e0fb06be2b is the IMAGE ID found when you used the docker images command.

Push fedora_postgresql
docker push ${PUBLIC_IP}:5000/fedora_postgresql

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