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README.md

socrata/runit-bionic

Image based on phusion/baseimage-docker that establises a base set of patterns and tools for building other containers with support for multiple processes via runit. This image is packaged with OpenJDK version 8 installed.

Features

  • Ubuntu 18.04 LTS. The base system.
  • A correct init process (my_init) with
    • proper process reaping
    • Docker Stop sends SIGTERM to the init process, which stops all processes gracefully on termination.
  • runit replaces Ubuntu's Upstart. Used for service supervision and management
  • Fixes APT incompatibilities with Docker See moby/moby#1024.
  • syslog-ng: A syslog daemon is necessary so that many services - including the kernel itself - can correctly log to /var/log/syslog
  • logrotate Rotates and compresses logs on a regular basis.
  • SSH server: disabled by default
  • cron The cron daemon must be running for cron jobs to work.
  • setuser A tool for running a command as another user. Easier to use than su, has a smaller attack vector than sudo, and unlike chpst this tool sets $HOME correctly. Available as /sbin/setuser.

See the usage section below

  • envconsul built-in: for creating environment variables based on consul k/v pairs
  • ark-host/ark-hostname route: /etc/host route to the docker host (configurable, but defaults to the default route IP)

Inside a docker container, the host’s ip and name are not available. By invoking these scripts, we can make the container aware of its host as necessary. They create the environment variables ARK_HOST and ARK_HOSTNAME.

  • env_parse: A tool for generating config files from jinja templates and environment variables.

This script lets a service owner build configuration files that are created at run time from environment variables and a template file. The template language is jinja and any template variables must be available as e nvironment variables. env_parse takes one argument, the template, and an optional argument for the output file. If omitted, the output file is identical to the template file name with the trailing .j2 removed.

Usage

Any container built on top of the socrata/runit-bionic image will default to running the whatever services are configured in /etc/service according via runit.

Anything placed in /etc/my_init.d will be run on startup in lexigraphical order before runit is invoked. A non-zero return code from any of these will halt the container.

Example

Assuming we build an image called awesome_sauce from a Dockerfile like this:

FROM socrata/runit-bionic

RUN mkdir /etc/service/myservice
COPY myservice-run /etc/service/myservice/run
COPY myservice-log /etc/service/myservice/log

Where run and log are runit service definitions where the run script looks like:

#!/bin/sh
exec /sbin/setuser socrata my_binary

and the log script looks like:

#!/bin/sh
exec svlogd -tt /var/log/myservice