Install MCollective


Note: This page is about installing MCollective, which is part of the larger deployment process. See the MCollective deployment index for the complete picture.

Puppet Enterprise includes MCollective and automates the deployment process. See its orchestration documentation for details about using MCollective to orchestrate your Puppet Enterprise infrastructure, and its installation instructions for help installing PE.

For the versions of Puppet agent components that ship with Puppet Enterprise, including the version of MCollective, see What Gets Installed and Where. For the components shipped with open source Puppet, see About Puppet Agent.

To install MCollective:

  1. Install and start your middleware, and configure your firewalls. See the pre-install instructions for details.
  2. Install the puppet-agent package on servers, and then make sure the mcollective service is running.
  3. Install the puppet-agent package on admin workstations.

Most Debian-like and Red Hat-like systems, as well as Windows and macOS, can use the official puppet-agent package to install MCollective and other Puppet components and prerequisites.

If your systems can’t use the official package, check the system requirements and either build your own or run from source.

Best practices

Use site-wide configuration management software to install and configure MCollective. Since you’ll need to install the server daemon on every node in your deployment, and since you’ll want each node to be running the same version, you should generally use Puppet or something like it to install MCollective.

Semantic versioning

All of our open source projects — including Puppet, Puppet Server, PuppetDB, Facter, and Hiera — use semantic versioning (“semver”) for their version numbers. This means that in an x.y.z version number, the “y” increases if new features are introduced and the “x” increases if existing features change or get removed.

Our semver promises only refer to the code in a single project; it’s possible for packaging or interactions with new “y” releases of other projects to cause new behavior in a “z” upgrade of Puppet.

Historical note: In Puppet versions prior to 3.0.0 and Facter versions prior to 1.7.0, we didn’t use semantic versioning.


  1. Deploy your middleware system before installing MCollective.
  2. Make sure each server’s firewall allows MCollective to initiate connections with the middleware server. The port depends on your deployment plan; with the recommended ActiveMQ connector, this is usually either 61614 for Stomp/TLS (recommended) or 61613 for unencrypted Stomp, depending on how you configured ActiveMQ’s transport connectors.

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System requirements

MCollective can run on almost any *nix operating system, as well as on Microsoft Windows. It requires Ruby 2.1 or later.

MCollective also requires version 1.2.2 or higher of the Stomp rubygem.

Installing with the official packages

Puppet provides an official pre-built puppet-agent for Windows, macOS, and the most common Linux-based operating systems. This package installs MCollective along with Puppet, its tools, and its prerequisites.

Install MCollective

Install the puppet-agent package using your operating system’s package manager. For details, follow the Puppet installation process.

Enable the MCollective service

Ensure that the mcollective service is running and is enabled to start at boot. The mcollective package installs an init script that works with your system’s service management tools.

At this point, MCollective is installed and running, but can’t connect to the middleware, accept commands, or execute actions. You should now configure the server daemon, configure admin workstations, and deploy plugins. See the standard deployment getting started guide for details.


As suggested in the best practices and server configuration reference, use configuration management software like Puppet to deploy MCollective on your nodes. This can be done with a simple or modified package/file/service pattern.

The example below uses a modified pattern that assumes that you:

  • Manage settings as resources in a different class.
  • Maintain your own package repository with tested versions of the MCollective packages, allowing you to safely use ensure => latest to automatically update packages.
  • Deployed all servers with this local repository enabled.
  • Manage client workstations separately, and only automate deployment on your servers.
class mcollective {
  # Install
  package {'mcollective':
    ensure => latest,

  # Run
  service {'mcollective':
    ensure  => running,
    enable  => true,
    require => Package['mcollective'],

  # Restart the service when any settings change
  Package['mcollective'] -> Mcollective::Setting <| |> ~> Service['mcollective']

For details about the relationship and collector syntax used to restart the MCollective service on setting changes, see the collector and chaining arrow references.

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Rolling custom RPM and Debian packages

If you use a system that doesn’t have an official puppet-agent package, you can build your own puppet-agent package. For more information, see the puppetlabs/puppet-agent repository on GitHub.

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Running from source

In addition to using our packages or building your own, you can also build MCollective directly from source.

Obtain the source

Get a copy of the MCollective source by cloning the GitHub repo or downloading a tarball.

Install Ruby and the Stomp gem

Install Ruby, and make sure that your system’s Ruby version meets MCollective’s system requirements. Also, install version 1.2.2 or higher of the stomp gem.

Add mcollective/lib to Ruby’s load path

Ruby must be able to load the contents of the lib directory in the MCollective source. There are two main ways to do this:

  • Recursively copy the contents of lib into the site_ruby directory
  • Put the MCollective source somewhere like /opt and use the RUBYLIB environment variable to add it to Ruby’s load path.

Copy mcollective/plugins

MCollective ships with a set of plugins that it requires for basic functionality. These do not live in its normal lib path, but rather in an external directory specified by the libdir setting in MCollective’s server and client configuration files.

Copy the contents of this plugins directory to a platform-appropriate place, and remember the location for your post-install configuration because you need to specify it in the libdir setting.

  • Windows platforms put plugins in C:\ProgramData\PuppetLabs\mcollective\plugins.
  • All other systems put plugins in /opt/puppetlabs/mcollective/plugins.

Other platforms might use different conventions.

Note: MCollective expects its libdir to contain a single directory named mcollective, which then contains the rest of the plugin directories. Don’t put your plugins in the parent directory of the directory that MCollective checks.


# /etc/puppetlabs/mcollective/server.cfg
# ...
libdir = /opt/puppetlabs/mcollective/plugins
  • Good: /opt/puppetlabs/mcollective/plugins/mcollective/agent/discovery.rb
  • Bad: /opt/puppetlabs/mcollective/plugins/agent/discovery.rb

Add mcollective/bin to the path

The root user on each server must be able to execute the mcollectived binary. Administrative users must be able to execute the mco binary. You should either link these to someplace like /usr/local/bin and /usr/local/sbin, or add the directory they live in to the appropriate users’ PATH environment variable.

Note: If you’re using Puppet Enterprise, only the peadmin user can run the mco command. For more information, see the PE MCollective actions documentation.

Roll your own init script

There are several example init scripts in the MCollective source:

The mcollective/ext directory contains additional files that might help you install and configure the MCollective service on your platform.

At this point, MCollective is installed and running but cannot connect to the middleware, accept commands, or execute any actions. You should now configure the server daemon, configure admin workstations, and deploy plugins. See the standard deployment getting started guide for details.

You won’t be able to count on the official package’s sensible defaults for MCollective’s configuration files, so set the logging and libdir settings after installation.

Installing from source on Windows

We currently have no instructions for installing MCollective from source on Windows. You should investigate the ext/windows directory in the MCollective source.

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