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310 lines
13 KiB
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**********************************
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Using Ansible with the Packet host
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**********************************
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Introduction
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============
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`Packet.net <https://packet.net>`_ is a bare metal infrastructure host that's supported by Ansible (>=2.3) via a dynamic inventory script and two cloud modules. The two modules are:
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- 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.
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- packet_device: manages servers on Packet. You can use this module to create, restart and delete devices.
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Note, this guide assumes you are familiar with Ansible and how it works. If you're not, have a look at their `docs <http://docs.ansible.com/>`_ before getting started.
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Requirements
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============
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The Packet modules and inventory script connect to the Packet API using the packet-python package. You can install it with pip:
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.. code-block:: bash
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$ pip install packet-python
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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/api-cli/>`_. Otherwise you can check them via the `Packet portal <https://app.packet.net/portal>`_.
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To use the modules and inventory script you'll need a Packet API token. You can generate an API token via 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:
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.. code-block:: bash
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$ export PACKET_API_TOKEN=Bfse9F24SFtfs423Gsd3ifGsd43sSdfs
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If you're not comfortable exporting your API token, you can pass it as a parameter to the modules.
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On Packet, devices and reserved IP addresses belong to `projects <https://www.packet.net/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 via one of the available `CLIs <https://www.packet.net/developers/integrations/api-cli/>`_.
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If you want to use a new SSH keypair in this tutorial, you can generate it to ``./id_rsa`` and ``./id_rsa.pub`` as:
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.. code-block:: bash
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$ ssh-keygen -t rsa -f ./id_rsa
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If you want to use an existing keypair, just copy the private and public key over to the playbook directory.
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Device Creation
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===============
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The following code block is a simple playbook that creates one `Type 0 <https://www.packet.net/bare-metal/servers/type-0/>`_ 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 via a `CLI client <https://www.packet.net/developers/integrations/api-cli/>`_.
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.. code-block:: yaml
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# playbook_create.yml
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- name: create ubuntu device
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hosts: localhost
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tasks:
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- packet_sshkey:
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key_file: ./id_rsa.pub
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label: tutorial key
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- packet_device:
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project_id: <your_project_id>
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hostnames: myserver
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operating_system: ubuntu_16_04
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plan: baremetal_0
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facility: sjc1
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After running ``ansible-playbook playbook_create.yml``, you should have a server provisioned on Packet. You can verify via a CLI or in the `Packet portal <https://app.packet.net/portal#/projects/list/table>`__.
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If you get an error with the message "failed to set machine state present, error: Error 404: Not Found", please verify your project UUID.
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Updating Devices
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================
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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.
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The 'device_ids' and 'hostnames' parameters are mutually exclusive. The following values are all acceptable:
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- device_ids: a27b7a83-fc93-435b-a128-47a5b04f2dcf
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- hostnames: mydev1
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- device_ids: [a27b7a83-fc93-435b-a128-47a5b04f2dcf, 4887130f-0ccd-49a0-99b0-323c1ceb527b]
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- hostnames: [mydev1, mydev2]
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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; i.e. ``hostnames: "mydev%d", count: 2`` will expand to [mydev1, mydev2].
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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:
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.. code-block:: yaml
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# playbook_reboot.yml
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- name: reboot myserver
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hosts: localhost
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tasks:
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- packet_device:
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project_id: <your_project_id>
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hostnames: myserver
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state: rebooted
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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/api-cli/>`_. The following playbook removes a Packet device using the 'device_ids' field:
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.. code-block:: yaml
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# playbook_remove.yml
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- name: remove a device
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hosts: localhost
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tasks:
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- packet_device:
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project_id: <your_project_id>
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device_ids: <myserver_device_id>
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state: absent
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More Complex Playbooks
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======================
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In this example, we'll create a CoreOS cluster with `user data <https://support.packet.net/en/support/solutions/articles/22000058261-the-basics-of-cloud-config-and-user-data>`_.
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The CoreOS cluster will use `etcd <https://coreos.com/etcd/>`_ for discovery of other servers in the cluster. Before provisioning your servers, you'll need to generate a discovery token for your cluster:
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.. code-block:: bash
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$ curl -w "\n" 'https://discovery.etcd.io/new?size=3'
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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'.
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.. code-block:: yaml
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# playbook_coreos.yml
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- name: Start 3 CoreOS nodes in Packet and wait until SSH is ready
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hosts: localhost
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tasks:
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- packet_sshkey:
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key_file: ./id_rsa.pub
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label: new
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- packet_device:
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hostnames: [coreos-one, coreos-two, coreos-three]
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operating_system: coreos_beta
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plan: baremetal_0
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facility: ewr1
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project_id: <your_project_id>
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wait: true
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user_data: |
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#cloud-config
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coreos:
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etcd2:
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discovery: https://discovery.etcd.io/<token>
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advertise-client-urls: http://$private_ipv4:2379,http://$private_ipv4:4001
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initial-advertise-peer-urls: http://$private_ipv4:2380
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listen-client-urls: http://0.0.0.0:2379,http://0.0.0.0:4001
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listen-peer-urls: http://$private_ipv4:2380
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fleet:
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public-ip: $private_ipv4
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units:
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- name: etcd2.service
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command: start
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- name: fleet.service
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command: start
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register: newhosts
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- name: wait for ssh
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wait_for:
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delay: 1
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host: "{{ item.public_ipv4 }}"
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port: 22
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state: started
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timeout: 500
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with_items: "{{ newhosts.devices }}"
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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.
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The second module call provisions 3 Packet Type 0 (specified using the 'plan' parameter) servers in the project identified via the 'project_id' parameter. The servers are all provisioned with CoresOS beta (the 'operating_system' parameter) and are customized with cloud-config user data passed to the 'user_data' parameter.
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The ``packet_device`` module has a boolean 'wait' parameter that defaults to 'false'. If set to 'true', Ansible will wait until the GET API call for a device will contain an Internet-routeable IP address. The 'wait' parameter allows us to use the IP address of the device as soon as it's available.
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Run the playbook:
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.. code-block:: bash
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$ ansible-playbook playbook_coreos.yml
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Once the playbook quits, your new devices should be reachable via SSH. Try to connect to one and check if etcd has started properly:
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.. code-block:: bash
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tomk@work $ ssh -i id_rsa core@$one_of_the_servers_ip
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core@coreos-one ~ $ etcdctl cluster-health
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Once you create a couple of devices, you might appreciate the dynamic inventory script...
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Dynamic Inventory Script
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========================
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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's git repo at `contrib/inventory/packet_net.py <https://github.com/ansible/ansible/blob/devel/contrib/inventory/packet_net.py>`_.
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The inventory script is configurable via a `ini file <https://github.com/ansible/ansible/blob/devel/contrib/inventory/packet_net.ini>`_.
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If you want to use the inventory script, you must first export your Packet API token to a PACKET_API_TOKEN environment variable.
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You can either copy the inventory and ini config out from the cloned git repo, or you can download it to your working directory like so:
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.. code-block:: bash
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$ wget https://github.com/ansible/ansible/raw/devel/contrib/inventory/packet_net.py
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$ chmod +x packet_net.py
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$ wget https://github.com/ansible/ansible/raw/devel/contrib/inventory/packet_net.ini
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In order to understand what the inventory script gives to Ansible you can run:
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.. code-block:: bash
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$ ./packet_net.py --list
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It should print a JSON document looking similar to following trimmed dictionary:
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.. code-block:: json
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{
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"_meta": {
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"hostvars": {
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"147.75.64.169": {
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"packet_billing_cycle": "hourly",
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"packet_created_at": "2017-02-09T17:11:26Z",
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"packet_facility": "ewr1",
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"packet_hostname": "coreos-two",
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"packet_href": "/devices/d0ab8972-54a8-4bff-832b-28549d1bec96",
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"packet_id": "d0ab8972-54a8-4bff-832b-28549d1bec96",
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"packet_locked": false,
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"packet_operating_system": "coreos_beta",
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"packet_plan": "baremetal_0",
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"packet_state": "active",
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"packet_updated_at": "2017-02-09T17:16:35Z",
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"packet_user": "core",
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"packet_userdata": "#cloud-config\ncoreos:\n etcd2:\n discovery: https://discovery.etcd.io/e0c8a4a9b8fe61acd51ec599e2a4f68e\n advertise-client-urls: http://$private_ipv4:2379,http://$private_ipv4:4001\n initial-advertise-peer-urls: http://$private_ipv4:2380\n listen-client-urls: http://0.0.0.0:2379,http://0.0.0.0:4001\n listen-peer-urls: http://$private_ipv4:2380\n fleet:\n public-ip: $private_ipv4\n units:\n - name: etcd2.service\n command: start\n - name: fleet.service\n command: start"
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}
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}
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},
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"baremetal_0": [
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"147.75.202.255",
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"147.75.202.251",
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"147.75.202.249",
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"147.75.64.129",
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"147.75.192.51",
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"147.75.64.169"
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],
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"coreos_beta": [
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"147.75.202.255",
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"147.75.202.251",
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"147.75.202.249",
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"147.75.64.129",
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"147.75.192.51",
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"147.75.64.169"
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],
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"ewr1": [
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"147.75.64.129",
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"147.75.192.51",
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"147.75.64.169"
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],
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"sjc1": [
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"147.75.202.255",
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"147.75.202.251",
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"147.75.202.249"
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],
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"coreos-two": [
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"147.75.64.169"
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],
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"d0ab8972-54a8-4bff-832b-28549d1bec96": [
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"147.75.64.169"
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]
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}
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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).
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In addition to the parameter groups, there are also one-item groups with the UUID or hostname of the device.
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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:
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.. code-block:: yaml
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# playbook_bootstrap.yml
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- hosts: coreos_beta
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gather_facts: false
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roles:
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- defunctzombie.coreos-boostrap
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Don't forget to supply the dynamic inventory in the ``-i`` argument!
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.. code-block:: bash
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$ ansible-playbook -u core -i packet_net.py playbook_bootstrap.yml
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If you have any questions or comments let us know! help@packet.net
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