1. Basic Usage¶
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
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