Perl S2I

This repository contains the sources for S2I builder image for perl 5.24 as well as some sample applications. This is a port to Fedora of software collections Perl located here. Please note that this solution uses httpd 2.4 to display results.

Usage

Docker

First you need to build the builder image. After you have the builder image, you can use it for a S2I build. You can build and run the sample app like this:

$ docker build --tag=koscicz/perl .
$ s2i build https://github.com/container-images/perl.git --context-dir=test/sample-test-app/ koscicz/perl perl-sample-app
$ docker run -p 8080:8080 perl-sample-app

This will build and run you application on 127.0.0.1:8080. You can also build the builder image by running make. This will also tag your image as koscicz/perl.

Openshift

You can use the openshift-template.yml in this repository to run your application in Openshift. You can either use web interface, in which case you'll just have to fill out a form, requiring a source repository for your app and name of this app. In case you want to use cli, you can do it like this, after you login:

$ oc new-project perl-test
$ oc new-app https://raw.githubusercontent.com/container-images/perl/master/openshift-template.yml -p APP_NAME="perl-example" -p SOURCE_REPOSITORY="https://github.com/kosciCZ/perl-example"

These commands will build the sample application on your Openshift platform.

Testing

This repository contains a test folder with some tests to ensure proper functionality. You can run test by using Makefile. You have two options: make all This will build, tag and test the image make test This will run the test on the image, that is defined in the Makefile. By default it is koscicz/perl Or you can execute the test script directly, as described below in Repository organization

Repository organization

• Dockerfile

  Fedora based Dockerfile.

• s2i/bin/

  This folder contains scripts that are run by S2I:

  • assemble

    Used to install the sources into a location where the application will be run and prepare the application for deployment (eg. installing modules, etc.). In order to install application dependencies, the application must contain a cpanfile file, in which the user specifies the modules and their versions. An example of a cpanfile is available within our test application.

    All files with .cgi and .pl extension are handled by mod_perl. If exactly one file with .psgi extension exists in the top-level directory, the mod_perl will be autoconfigured to execute the PSGI application for any request URI path with Plack's mod_perl adaptor.

  • run

    This script is responsible for running the application, using the Apache web server.

  • usage*

    This script prints the usage of this image.

• contrib/

  This folder contains a file with commonly used modules.

• test/

  This folder contains some sample applications you can use to test you image.

  • sample-test-app/

    A simple Perl application used for testing purposes by the S2I test framework.

  • run

    This is a script that runs a test suite on the builder image, to ensure it has all the necessary functionality. Run it by ./run IMAGE, where IMAGE is your builder image.

Environment variables

To set environment variables, you can place them as a key value pair into a .sti/environment file inside your source code repository.

• ENABLE_CPAN_TEST

  Allow the installation of all specified cpan packages and the running of their tests. The default value is false.

• CPAN_MIRROR

  This variable specifies a mirror URL which will used by cpanminus to install dependencies. By default the URL is not specified.

• PERL_APACHE2_RELOAD

  Set this to "true" to enable automatic reloading of modified Perl modules.

• HTTPD_START_SERVERS

  The StartServers directive sets the number of child server processes created on startup. Default is 8.

• HTTPD_MAX_REQUEST_WORKERS

  Number of simultaneous requests that will be handled by Apache. The default is 256, but it will be automatically lowered if memory is limited.

• PSGI_FILE

  Override PSGI application detection.

  If the PSGI_FILE variable is set to empty value, no PSGI application will be detected and mod_perl not be reconfigured.

  If the PSGI_FILE variable is set and non-empty, it will define path to the PSGI application file. No detection will be used.

  If the PSGI_FILE variable does not exist, autodetection will be used: If exactly one ./*.psgi file exists, mod_perl will be configured to execute that file.

• PSGI_URI_PATH

  This variable overrides location URI path that is handled path the PSGI application. Default value is "/".