add module for docker containers

lib/Site/DockerPs.pm

+package Site::DockerPs;
+
+use strict;
+use warnings;
+
+use base 'Resmon::Module';
+
+use Resmon::ExtComm qw(run_command);
+
+=pod
+
+=head1 NAME
+
+Site::DockerPs - Check current docker VM status
+
+=head1 SYNOPSIS
+
+ Site::DockerPs {
+    check_ps : docker_path => /usr/bin/docker
+ }
+
+=head1 DESCRIPTION
+
+This module retrieves VM statistics.
+
+=head1 CONFIGURATION
+
+=over
+
+=item check_name
+
+Arbitrary name of the check.
+
+=item docker_path
+
+Optional path to the docker executable.
+
+=back
+
+=head1 METRICS
+
+=over
+
+=item active
+
+=item inactive
+
+=back
+
+=cut
+
+sub handler {
+    my $self = shift;
+    my $config = $self->{'config'};
+    my $docker_path = $config->{'docker_path'} || 'docker';
+    my $output_active = run_command("$docker_path ps");
+    my $output_inactive = run_command("$docker_path ps --filter 'status=exited'");
+    my %metrics = (
+	"active" => $output_active,
+	"inactive" => $output_inactive,
+    );
+
+    return \%metrics;
+};
+
+1;