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Perl

Overview

OpenShift Enterprise provides S2I enabled Perl images for building and running Perl applications. The Perl S2I builder image assembles your application source with any required dependencies to create a new image containing your Perl application. This resulting image can be run either by OpenShift Enterprise or by Docker.

Versions

Currently, OpenShift Enterprise supports version 5.16 of Perl.

Images

This image comes in two flavors, depending on your needs:

  • RHEL 7

  • CentOS 7

RHEL 7 Based Image

The RHEL 7 image is available through Red Hat’s subscription registry using:

$ docker pull registry.access.redhat.com/openshift3/perl-516-rhel7

CentOS 7 Based Image

This image is available on DockerHub. To download it:

$ docker pull openshift/perl-516-centos7

To use these images, you can either access them directly from these image registries, or push them into your OpenShift Enterprise Docker registry. Additionally, you can create an image stream that points to the image, either in your Docker registry or at the external location. Your OpenShift Enterpriset resources can then reference the ImageStream. You can find example image stream definitions for all the provided OpenShift Enterprise images.

Configuration

The Perl image supports a number of environment variables which can be set to control the configuration and behavior of the Perl runtime.

To set these environment variables, you can place them into a .sti/environment file inside your source code repository, or define them in the environment section of the build configuration’s sourceStrategy definition.

Table 1. Perl Environment Variables
Variable name Description

ENABLE_CPAN_TEST

This variable installs all the cpan modules and runs their tests. By default, the testing of the modules is turned off.

CPAN_MIRROR

This variable specifies a mirror URL which cpanminus uses to install dependencies. By default, this URL is not specified.

PERL_APACHE2_RELOAD

Set this to true to enable automatic reloading of modified Perl modules. By default, automatic reloading is turned off.

Accessing Logs

Access logs are streamed to standard output and as such they can be viewed using the oc logs command. Error logs are stored in the /tmp/error_log file, which can be viewed using the oc rsh command to access the container.

Hot Deploying

Hot deployment allows you to quickly make and deploy changes to your application without having to generate a new S2I build. To enable hot deployment in this image, you must set the PERL_APACHE2_RELOAD environment variable to true. For example, see the oc new-app command. You can use the oc env command to update environment variables of existing objects.

You should only use this option while developing or debugging; it is not recommended to turn this on in your production environment.

To change your source code in a running pod, use the oc rsh command to enter the container:

$ oc rsh <pod_id>

After you enter into the running container, your current directory is set to /opt/app-root/src, where the source code is located.