(R)?ex the friendly automation framework



Rex-1.14.3 is now available on CPAN. It contains bug fixes for local package installation, command existence checks, and Git tests.


The Rex-1.14.2 release is now available on CPAN. It contains bug fixes for running local commands on Windows, cloning git repositories, and test suite fixes for the upcoming perl-5.38.0 release.

Call for papers TPRC 2023

Dean Hamstead from the The Perl and Raku Foundation Marketing Committee has sent an invitation to present about Rex at TPRC 2023. I’m posting it here to increase visibility.


The Rex-1.14.1 release is now available on CPAN. It contains bug fixes and documentation updates.


The Rex-1.14.0 release is now available on CPAN. It contains improved Rexfile loading, documentation updates, and bumps the minimum required Perl version to 5.12.5.


Learning automation using Rex

Ferenc Erki (FErki) will be the guest of Gábor Szabó on the next Code Maven live stream to learn about automation using Rex. Register for the free event via Code Maven or Meetup, and join the discussion!

Unexpected use cases with Rex

Unexpected use cases with Rex at the 22nd German Perl/Raku Workshop 2020 in Erlangen by Ferenc Erki (FErki).

Rex & Friends

Rex & Friends talk at the Barcelona Perl & Friends 2019 by Ferenc Erki (FErki).

» Home » Docs » Release notes » Release notes for 0.36

Release notes for 0.36


You can download OpenNebula module with the following command:

bash # rexify --use Rex::Cloud::OpenNebula

  use strict;
use warnings;

use Rex::Commands::Cloud;
use Rex::Cloud::OpenNebula;
use Data::Dumper;

user "root";

cloud_service "OpenNebula";
cloud_auth "oneadmin", "opennebula";
cloud_region "";

task "list-os", sub {
    print Dumper get_cloud_operating_systems;

task "create", sub {
    my $params = shift;
    my $vm     = cloud_instance create => {
        image => "template-1",
        name  => $params->{name},

    print Dumper($vm);

task "start", sub {
    my $params = shift;
    cloud_instance start => $params->{name};

task "stop", sub {
    my $params = shift;
    cloud_instance stop => $params->{name};

task "terminate", sub {
    my $params = shift;
    cloud_instance terminate => $params->{name};

task "list", sub {
    print Dumper cloud_instance_list;

With this function you can run a specific task on a given host and get the output as a return value.

task "prepare", "server5", sub {

    # do something
    my $free_mem = run_task "get_free_mem", on => "server3";
    if ( $free_mem < 100 ) {
        say "Less than 100 MB free mem on server3";

        # create a new server instance on server5 to unload server3

task "get_free_mem", sub {
    return memory->{free};

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