This is a small base docker image for running Elixir projects.

• small - based on Alpine Linux, ~20MB
• developer friendly - out of box with pre-installed utilities, including:
  • bash
  • iftop
  • procps with following programs:
    • free - Report the amount of free and used memory in the system
    • kill - Send a signal to a process based on PID
    • pgrep - List processes based on name or other attributes
    • pkill - Send a signal to a process based on name or other attributes
    • pmap - Report memory map of a process
    • ps - Report information of processes
    • pwdx - Report current directory of a process
    • skill - Obsolete version of pgrep/pkill
    • slabtop - Display kernel slab cache information in real time
    • snice - Renice a process
    • sysctl - Read or Write kernel parameters at run-time
    • tload - Graphical representation of system load average
    • top - Dynamic real-time view of running processes
    • uptime - Display how long the system has been running
    • vmstat - Report virtual memory statistics
    • w - Report logged in users and what they are doing
    • watch - Execute a program periodically, showing output fullscreen
  • iftop
  • systat
  • recent version of Glibc to provide better Erlang NIF support for Golang extensions

• The project is supposed to deploy with mix release introduced in Elixir 1.9
• The application is supposed to be located at /app, no matter what name the project is.
• Environment variable APP_NAME represents the project name, such as my_app for instance.

You can extend this image with your own set of programs. For example, let's say we need image libraries so we can deal with user uploaded images. You can write your Dockerfile like this:

FROM qhwa/elixir-runner:latest

RUN apk update --no-cache && \
  apk add --no-cache \
    libpng \
    libpng-dev \
    libjpeg-turbo-utils \
    pngquant