1. Basic Usage

1.1. Search

• https://hub.docker.com

$ docker search NAME

1.2. Pulling from Docker Hub

• Only pull

• Will not run

$ docker pull IMAGE_NAME

1.3. Operating system images

1.3.1. Alpine

• Image size is 5.53 MB

• Edge is the newest version

• https://hub.docker.com/_/alpine?tab=tags&page=1&ordering=last_updated

$ docker pull alpine

1.3.2. Debian

• Image size is 114 MB

• Debian version names are from Toy Story

• Sid is always unstable

• https://www.debian.org/releases/

• Version Names - https://www.debian.org/doc/manuals/debian-faq/ch-ftparchives#s-sourceforcodenames

• Docker Hub: https://hub.docker.com/_/debian?tab=tags&page=1&ordering=last_updated

• Release Table: https://en.wikipedia.org/wiki/Debian_version_history#Release_table

• Release Timeline: https://en.wikipedia.org/wiki/Debian_version_history#Release_timeline

$ docker pull debian

1.3.3. Ubuntu

• Image size is 66 MB

• Ubuntu version numbers are YY.MM

• LTS or 'Long Term Support' releases are published every two years in April

• Release Cycle - https://ubuntu.com/about/release-cycle

• Version Names - https://wiki.ubuntu.com/DevelopmentCodeNames

• Docker Hub - https://hub.docker.com/_/ubuntu?tab=tags&page=1&ordering=last_updated

Figure 1.8. Long term support and interim releases

$ docker pull ubuntu:18.04
$ docker pull ubuntu:latest
$ docker pull ubuntu          # will pull latest

1.4. Where docker store containers

• /var/lib/docker/containers

$ docker info |grep 'Docker Root Dir'
Docker Root Dir: /var/lib/docker