Windows Support

Windows: How Does It Work

As you may have already read, Ansible manages Linux/Unix machines using SSH by default.

Starting in version 1.7, Ansible also contains support for managing Windows machines. This uses native PowerShell remoting, rather than SSH.

Ansible will still be run from a Linux control machine, and uses the “winrm” Python module to talk to remote hosts.

No additional software needs to be installed on the remote machines for Ansible to manage them, it still maintains the agentless properties that make it popular on Linux/Unix.

Note that it is expected you have a basic understanding of Ansible prior to jumping into this section, so if you haven’t written a Linux playbook first, it might be worthwhile to dig in there first.

Installing on the Control Machine

On a Linux control machine:

pip install https://github.com/diyan/pywinrm/archive/master.zip#egg=pywinrm

If you wish to connect to domain accounts published through Active Directory (as opposed to local accounts created on the remote host):

pip install kerberos

Kerberos is installed and configured by default on OS X and many Linux distributions. If your control machine has not already done this for you, you will need to.

Inventory

Ansible’s windows support relies on a few standard variables to indicate the username, password, and connection type (windows) of the remote hosts. These variables are most easily set up in inventory. This is used instead of SSH-keys or passwords as normally fed into Ansible:

[windows]
winserver1.example.com
winserver2.example.com

In group_vars/windows.yml, define the following inventory variables:

# it is suggested that these be encrypted with ansible-vault:
# ansible-vault edit group_vars/windows.yml

ansible_ssh_user: Administrator
ansible_ssh_pass: SecretPasswordGoesHere
ansible_ssh_port: 5986
ansible_connection: winrm

Notice that the ssh_port is not actually for SSH, but this is a holdover variable name from how Ansible is mostly an SSH-oriented system. Again, Windows management will not happen over SSH.

If you have installed the kerberos module and ansible_ssh_user contains @ (e.g. username@realm), Ansible will first attempt Kerberos authentication. This method uses the principal you are authenticated to Kerberos with on the control machine and not ``ansible_ssh_user``. If that fails, either because you are not signed into Kerberos on the control machine or because the corresponding domain account on the remote host is not available, then Ansible will fall back to “plain” username/password authentication.

When using your playbook, don’t forget to specify –ask-vault-pass to provide the password to unlock the file.

Test your configuration like so, by trying to contact your Windows nodes. Note this is not an ICMP ping, but tests the Ansible communication channel that leverages Windows remoting:

ansible windows [-i inventory] -m win_ping --ask-vault-pass

If you haven’t done anything to prep your systems yet, this won’t work yet. This is covered in a later section about how to enable PowerShell remoting - and if necessary - how to upgrade PowerShell to a version that is 3 or higher.

You’ll run this command again later though, to make sure everything is working.

Windows System Prep

In order for Ansible to manage your windows machines, you will have to enable PowerShell remoting configured.

To automate setup of WinRM, you can run this PowerShell script on the remote machine.

Admins may wish to modify this setup slightly, for instance to increase the timeframe of the certificate.

Note

On Windows 7 and Server 2008 R2 machines, due to a bug in Windows Management Framework 3.0, it may be necessary to install this hotfix http://support.microsoft.com/kb/2842230 to avoid receiving out of memory and stack overflow exceptions. Newly-installed Server 2008 R2 systems which are not fully up to date with windows updates are known to have this issue.

Windows 8.1 and Server 2012 R2 are not affected by this issue as they come with Windows Management Framework 4.0.

Getting to PowerShell 3.0 or higher

PowerShell 3.0 or higher is needed for most provided Ansible modules for Windows, and is also required to run the above setup script. Note that PowerShell 3.0 is only supported on Windows 7 SP1, Windows Server 2008 SP1, and later releases of Windows.

Looking at an ansible checkout, copy the examples/scripts/upgrade_to_ps3.ps1 script onto the remote host and run a PowerShell console as an administrator. You will now be running PowerShell 3 and can try connectivity again using the win_ping technique referenced above.

What modules are available

Most of the Ansible modules in core Ansible are written for a combination of Linux/Unix machines and arbitrary web services, though there are various Windows modules as listed in the “windows” subcategory of the Ansible module index.

Browse this index to see what is available.

In many cases, it may not be necessary to even write or use an Ansible module.

In particular, the “script” module can be used to run arbitrary PowerShell scripts, allowing Windows administrators familiar with PowerShell a very native way to do things, as in the following playbook:

- hosts: windows
  tasks:
    - script: foo.ps1 --argument --other-argument

Note there are a few other Ansible modules that don’t start with “win” that also function, including “slurp”, “raw”, and “setup” (which is how fact gathering works).

Developers: Supported modules and how it works

Developing ansible modules are covered in a later section of the documentation, with a focus on Linux/Unix. What if you want to write Windows modules for ansible though?

For Windows, ansible modules are implemented in PowerShell. Skim those Linux/Unix module development chapters before proceeding.

Windows modules live in a “windows/” subfolder in the Ansible “library/” subtree. For example, if a module is named “library/windows/win_ping”, there will be embedded documentation in the “win_ping” file, and the actual PowerShell code will live in a “win_ping.ps1” file. Take a look at the sources and this will make more sense.

Modules (ps1 files) should start as follows:

#!powershell
# <license>

# WANT_JSON
# POWERSHELL_COMMON

# code goes here, reading in stdin as JSON and outputting JSON

The above magic is necessary to tell Ansible to mix in some common code and also know how to push modules out. The common code contains some nice wrappers around working with hash data structures and emitting JSON results, and possibly a few more useful things. Regular Ansible has this same concept for reusing Python code - this is just the windows equivalent.

What modules you see in windows/ are just a start. Additional modules may be submitted as pull requests to github.

Reminder: You Must Have a Linux Control Machine

Note running Ansible from a Windows control machine is NOT a goal of the project. Refrain from asking for this feature, as it limits what technologies, features, and code we can use in the main project in the future. A Linux control machine will be required to manage Windows hosts.

Cygwin is not supported, so please do not ask questions about Ansible running from Cygwin.

Windows Facts

Just as with Linux/Unix, facts can be gathered for windows hosts, which will return things such as the operating system version. To see what variables are available about a windows host, run the following:

ansible winhost.example.com -m setup

Note that this command invocation is exactly the same as the Linux/Unix equivalent.

Windows Playbook Examples

Look to the list of windows modules for most of what is possible, though also some modules like “raw” and “script” also work on Windows, as do “fetch” and “slurp”.

Here is an example of pushing and running a PowerShell script:

- name: test script module
  hosts: windows
  tasks:
    - name: run test script
      script: files/test_script.ps1

Running individual commands uses the ‘raw’ module, as opposed to the shell or command module as is common on Linux/Unix operating systems:

- name: test raw module
  hosts: windows
  tasks:
    - name: run ipconfig
      raw: ipconfig
      register: ipconfig
    - debug: var=ipconfig

And for a final example, here’s how to use the win_stat module to test for file existence. Note that the data returned by the win_stat module is slightly different than what is provided by the Linux equivalent:

- name: test stat module
  hosts: windows
  tasks:
    - name: test stat module on file
      win_stat: path="C:/Windows/win.ini"
      register: stat_file

    - debug: var=stat_file

    - name: check stat_file result
      assert:
          that:
             - "stat_file.stat.exists"
             - "not stat_file.stat.isdir"
             - "stat_file.stat.size > 0"
             - "stat_file.stat.md5"

Again, recall that the Windows modules are all listed in the Windows category of modules, with the exception that the “raw”, “script”, and “fetch” modules are also available. These modules do not start with a “win” prefix.

Windows Contributions

Windows support in Ansible is still very new, and contributions are quite welcome, whether this is in the form of new modules, tweaks to existing modules, documentation, or something else. Please stop by the ansible-devel mailing list if you would like to get involved and say hi.

See also

Developing Modules
How to write modules
Playbooks
Learning ansible’s configuration management language
List of Windows Modules
Windows specific module list, all implemented in PowerShell
Mailing List
Questions? Help? Ideas? Stop by the list on Google Groups
irc.freenode.net
#ansible IRC chat channel