lincheney/alpine-passenger repository overview

⁠alpine-passenger⁠

Phusion Passenger Standalone running on Alpine Linux in Docker.

Available on Docker Hub: https://registry.hub.docker.com/u/lincheney/alpine-passenger/⁠

⁠Super simple Rack⁠ example

Shamelessly copy the example on the rack website ...

# config.ru
run Proc.new { |env| ['200', {'Content-Type' => 'text/html'}, ['get rack\'d']] }

... add a Dockerfile ...

# Dockerfile
FROM lincheney/alpine-passenger
RUN apk add --update ruby-rack && rm -rf /var/cache/apk/*
COPY config.ru /usr/src/app/

... build the image and then run it!

> docker build -t rack-example .
> docker run -d -p 80:3000 --name rack-app rack-example
> curl 'http://localhost'
get rack'd

We can also get the Passenger status:

> docker exec rack-app passenger status
Phusion Passenger Standalone is running on PID 37, according to PID file /usr/src/app/passenger.3000.pid

⁠Details

The image based on Alpine Linux 3.2⁠ running the Phusion Passenger Standalone runtime 5.0.21⁠ with native support compiled for Ruby 2.2.3⁠.

⁠Phusion Passenger Standalone

The standalone runtime runs on Nginx. Those interested should take a look at the docs⁠ provided by the Phusion team, especially command line options⁠ and Nginx configuration⁠

⁠Default command line arguments

By default, the image runs with passenger start --no-install-runtime --no-compile-runtime --no-download plus the additional arguments supplied to docker run.

Passenger runs on port 3000 by default and this port has been exposed.

⁠Edge packages

Passenger requires packages only available in the testing repository of Alpine Linux edge: libexecinfo⁠ and libexecinfo-dev⁠.

⁠Building extension modules

You can use this image to build the Nginx or Apache modules for Phusion Passenger. Take care that you will need to compile from source! Pre-compiled binaries that the Phusion team provide (probably) won't work since Alpine Linux uses musl instead of glibc.

Have a look at the alpine-passenger Dockerfile to see how the standalone runtime was compiled.