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Add OS upgrade instructions

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Hongli Lai (Phusion) 2015-07-15 15:46:03 +02:00
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@ -52,6 +52,7 @@ You can configure the stock `ubuntu` image yourself from your Dockerfile, so why
* [Environment variable dumps](#envvar_dumps)
* [Modifying environment variables](#modifying_envvars)
* [Security](#envvar_security)
* [Upgrading the operating system inside the container](#upgrading_os)
* [Container administration](#container_administration)
* [Running a one-shot command in a new container](#oneshot)
* [Running a command in an existing, running container](#run_inside_existing_container)
@ -274,6 +275,17 @@ If you are sure that your environment variables don't contain sensitive data, th
RUN chmod 755 /etc/container_environment
RUN chmod 644 /etc/container_environment.sh /etc/container_environment.json
<a name="upgrading_os"></a>
### Upgrading the operating system inside the container
Baseimage-docker images contain an Ubuntu 14.04 operating system. You may want to update this OS from time to time, for example to pull in the latest security updates. OpenSSL is a notorious example. Vulnerabilities are discovered in OpenSSL on a regular basis, so you should keep OpenSSL up-to-date as much as you can.
While we release Baseimage-docker images with the latest OS updates from time to time, you do not have to rely on us. You can update the OS inside Baseimage-docker images yourself, and it is recommend that you do this instead of waiting for us.
To upgrade the OS in the image, run this in your Dockerfile:
RUN apt-get update && apt-get upgrade -y -o Dpkg::Options::="--force-confold"
<a name="container_administration"></a>
## Container administration