`Packet.net <https://packet.net>`_ is a bare metal infrastructure host that's supported by Ansible (>=2.3) through a dynamic inventory script and two cloud modules. The two modules are:
- packet_sshkey: adds a public SSH key from file or value to the Packet infrastructure. Every subsequently-created device will have this public key installed in .ssh/authorized_keys.
- packet_device: manages servers on Packet. You can use this module to create, restart and delete devices.
Note, this guide assumes you are familiar with Ansible and how it works. If you're not, have a look at their :ref:`docs <ansible_documentation>` before getting started.
In order to check the state of devices created by Ansible on Packet, it's a good idea to install one of the `Packet CLI clients <https://www.packet.net/developers/integrations/>`_. Otherwise you can check them through the `Packet portal <https://app.packet.net/portal>`_.
To use the modules and inventory script you'll need a Packet API token. You can generate an API token through the Packet portal `here <https://app.packet.net/portal#/api-keys>`__. The simplest way to authenticate yourself is to set the Packet API token in an environment variable:
On Packet, devices and reserved IP addresses belong to `projects <https://www.packet.com/developers/api/#projects>`_. In order to use the packet_device module, you need to specify the UUID of the project in which you want to create or manage devices. You can find a project's UUID in the Packet portal `here <https://app.packet.net/portal#/projects/list/table/>`_ (it's just under the project table) or through one of the available `CLIs <https://www.packet.net/developers/integrations/>`_.
The following code block is a simple playbook that creates one `Type 0 <https://www.packet.com/cloud/servers/t1-small/>`_ server (the 'plan' parameter). You have to supply 'plan' and 'operating_system'. 'location' defaults to 'ewr1' (Parsippany, NJ). You can find all the possible values for the parameters through a `CLI client <https://www.packet.net/developers/integrations/>`_.
After running ``ansible-playbook playbook_create.yml``, you should have a server provisioned on Packet. You can verify through a CLI or in the `Packet portal <https://app.packet.net/portal#/projects/list/table>`__.
If you get an error with the message "failed to set machine state present, error: Error 404: Not Found", please verify your project UUID.
Updating Devices
================
The two parameters used to uniquely identify Packet devices are: "device_ids" and "hostnames". Both parameters accept either a single string (later converted to a one-element list), or a list of strings.
The 'device_ids' and 'hostnames' parameters are mutually exclusive. The following values are all acceptable:
In addition, hostnames can contain a special '%d' formatter along with a 'count' parameter that lets you easily expand hostnames that follow a simple name and number pattern; in other words, ``hostnames: "mydev%d", count: 2`` will expand to [mydev1, mydev2].
If your playbook acts on existing Packet devices, you can only pass the 'hostname' and 'device_ids' parameters. The following playbook shows how you can reboot a specific Packet device by setting the 'hostname' parameter:
You can also identify specific Packet devices with the 'device_ids' parameter. The device's UUID can be found in the `Packet Portal <https://app.packet.net/portal>`_ or by using a `CLI <https://www.packet.net/developers/integrations/>`_. The following playbook removes a Packet device using the 'device_ids' field:
The CoreOS cluster will use `etcd <https://etcd.io/>`_ for discovery of other servers in the cluster. Before provisioning your servers, you'll need to generate a discovery token for your cluster:
The following playbook will create an SSH key, 3 Packet servers, and then wait until SSH is ready (or until 5 minutes passed). Make sure to substitute the discovery token URL in 'user_data', and the 'project_id' before running ``ansible-playbook``. Also, feel free to change 'plan' and 'facility'.
..code-block:: yaml
# playbook_coreos.yml
- name: Start 3 CoreOS nodes in Packet and wait until SSH is ready
As with most Ansible modules, the default states of the Packet modules are idempotent, meaning the resources in your project will remain the same after re-runs of a playbook. Thus, we can keep the ``packet_sshkey`` module call in our playbook. If the public key is already in your Packet account, the call will have no effect.
The second module call provisions 3 Packet Type 0 (specified using the 'plan' parameter) servers in the project identified by the 'project_id' parameter. The servers are all provisioned with CoreOS beta (the 'operating_system' parameter) and are customized with cloud-config user data passed to the 'user_data' parameter.
The ``packet_device`` module has a ``wait_for_public_IPv`` that is used to specify the version of the IP address to wait for (valid values are ``4`` or ``6`` for IPv4 or IPv6). If specified, Ansible will wait until the GET API call for a device contains an Internet-routeable IP address of the specified version. When referring to an IP address of a created device in subsequent module calls, it's wise to use the ``wait_for_public_IPv`` parameter, or ``state: active`` in the packet_device module call.
The dynamic inventory script queries the Packet API for a list of hosts, and exposes it to Ansible so you can easily identify and act on Packet devices.
You can find it in Ansible Community General Collection's git repo at `scripts/inventory/packet_net.py <https://raw.githubusercontent.com/ansible-community/contrib-scripts/main/inventory/packet_net.py>`_.
The inventory script is configurable through an `ini file <https://raw.githubusercontent.com/ansible-community/contrib-scripts/main/inventory/packet_net.ini>`_.
In the ``['_meta']['hostvars']`` key, there is a list of devices (uniquely identified by their public IPv4 address) with their parameters. The other keys under ``['_meta']`` are lists of devices grouped by some parameter. Here, it is type (all devices are of type baremetal_0), operating system, and facility (ewr1 and sjc1).
In addition to the parameter groups, there are also one-item groups with the UUID or hostname of the device.
You can now target groups in playbooks! The following playbook will install a role that supplies resources for an Ansible target into all devices in the "coreos_beta" group:
..code-block:: yaml
# playbook_bootstrap.yml
- hosts: coreos_beta
gather_facts: false
roles:
- defunctzombie.coreos-boostrap
Don't forget to supply the dynamic inventory in the ``-i`` argument!
