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Hongli Lai (Phusion) 2013-11-12 11:53:14 +01:00
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# A minimal Docker base image with a correct and usable system
Baseimage-docker is a [Docker](http://www.docker.io) image meant to serve as a good base for any other Docker container. It contains a minimal base system with the most important things already installed and set up correctly.
Included in the image are:
| Component | Why is it included? | Remarks |
| ------------- | ------------------- | ------- |
| An Ubuntu 12.04 LTS base system. | | |
| syslog-ng | A syslog daemon is necessary so that many services - including the kernel itself - can correctly log to /var/log/syslog. If no syslog daemon is running, a lot of important messages are silently swallowed. | Only listens locally. |
| ssh server | | |
| [runit](http://smarden.org/runit/) | For service supervision and management. Much easier to use than SysV init and supports restarting daemons when they crash. Much easier to use and more lightweight than Upstart. | |
* The SSH server, so that you can easily login to your container to inspect or administer things.
* Password and challenge-response authentication are disabled by default. Only key authentication is allowed.
* It allows an predefined key by default to make debugging easy. You should replace this ASAP. See instructions.
Why use baseimage-docker instead of doing everything yourself in Dockerfile?
# Use phusion/baseimage as base image. To make your builds reproducible, make
# sure you lock down to a specific version, not to `latest`!