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34 lines
1.9 KiB
Markdown
34 lines
1.9 KiB
Markdown
# A minimal Docker base image with a correct and usable system
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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.
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Included in the image are:
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| Component | Why is it included? / Remarks | Remarks |
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| ------------- | ------------------- | ------- |
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| Ubuntu 12.04 LTS | The base system. | |
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| 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. <br>Only listens locally. | Only listens locally. |
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| ssh server | | |
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| [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. | |
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* The SSH server, so that you can easily login to your container to inspect or administer things.
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* Password and challenge-response authentication are disabled by default. Only key authentication is allowed.
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* It allows an predefined key by default to make debugging easy. You should replace this ASAP. See instructions.
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Why use baseimage-docker instead of doing everything yourself in Dockerfile?
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# Use phusion/baseimage as base image. To make your builds reproducible, make
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# sure you lock down to a specific version, not to `latest`!
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FROM phusion/baseimage:<VERSION>
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# Remove authentication rights for insecure_key.
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RUN rm -f /root/.ssh/authorized_keys /home/*/.ssh/authorized_keys
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# Use baseimage-docker's init process.
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CMD ["/sbin/my_init"]
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# ...put other build instructions here...
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# Clean up APT when done.
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RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
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