mirror of https://github.com/ceph/ceph-ansible.git
305 lines
9.7 KiB
ReStructuredText
305 lines
9.7 KiB
ReStructuredText
============
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ceph-ansible
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============
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Ansible playbooks for Ceph, the distributed filesystem.
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Installation
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============
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GitHub
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------
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You can install directly from the source on GitHub by following these steps:
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- Clone the repository:
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.. code-block:: console
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$ git clone https://github.com/ceph/ceph-ansible.git
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- Next, you must decide which branch of ``ceph-ansible`` you wish to use. There
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are stable branches to choose from or you could use the master branch:
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.. code-block:: console
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$ git checkout $branch
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- Next, use pip and the provided requirements.txt to install Ansible and other
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needed Python libraries:
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.. code-block:: console
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$ pip install -r requirements.txt
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.. _ansible-on-rhel-family:
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Ansible on RHEL and CentOS
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--------------------------
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You can acquire Ansible on RHEL and CentOS by installing from `Ansible channel <https://access.redhat.com/articles/3174981>`_.
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On RHEL:
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.. code-block:: console
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$ subscription-manager repos --enable=rhel-7-server-ansible-2-rpms
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(CentOS does not use subscription-manager and already has "Extras" enabled by default.)
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.. code-block:: console
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$ sudo yum install ansible
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Ansible on Ubuntu
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-----------------
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You can acquire Ansible on Ubuntu by using the `Ansible PPA <https://launchpad.net/~ansible/+archive/ubuntu/ansible>`_.
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.. code-block:: console
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$ sudo add-apt-repository ppa:ansible/ansible
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$ sudo apt update
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$ sudo apt install ansible
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Releases
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========
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The following branches should be used depending on your requirements. The ``stable-*``
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branches have been QE tested and sometimes recieve backport fixes throughout their lifecycle.
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The ``master`` branch should be considered experimental and used with caution.
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- ``stable-3.0`` Supports Ceph versions ``jewel`` and ``luminous``. This branch requires Ansible version ``2.4``.
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- ``stable-3.1`` Supports Ceph versions ``luminous`` and ``mimic``. This branch requires Ansible version ``2.4``.
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- ``stable-3.2`` Supports Ceph versions ``luminous`` and ``mimic``. This branch requires Ansible version ``2.6``.
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- ``stable-4.0`` Supports Ceph version ``nautilus``. This branch requires Ansible version ``2.8``.
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- ``master`` Supports the master branch of Ceph. This branch requires Ansible version ``2.8``.
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Configuration and Usage
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=======================
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This project assumes you have a basic knowledge of how Ansible works and have already prepared your hosts for
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configuration by Ansible.
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After you've cloned the ``ceph-ansible`` repository, selected your branch and installed Ansible then you'll need to create
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your inventory file, playbook and configuration for your Ceph cluster.
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Inventory
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---------
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The Ansible inventory file defines the hosts in your cluster and what roles each host plays in your Ceph cluster. The default
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location for an inventory file is ``/etc/ansible/hosts`` but this file can be placed anywhere and used with the ``-i`` flag of
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``ansible-playbook``.
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An example inventory file would look like:
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.. code-block:: ini
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[mons]
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mon1
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mon2
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mon3
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[osds]
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osd1
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osd2
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osd3
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.. note::
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For more information on Ansible inventories please refer to the Ansible documentation: http://docs.ansible.com/ansible/latest/intro_inventory.html
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Playbook
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--------
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You must have a playbook to pass to the ``ansible-playbook`` command when deploying your cluster. There is a sample playbook at the root of the ``ceph-ansible``
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project called ``site.yml.sample``. This playbook should work fine for most usages, but it does include by default every daemon group which might not be
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appropriate for your cluster setup. Perform the following steps to prepare your playbook:
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- Rename the sample playbook: ``mv site.yml.sample site.yml``
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- Modify the playbook as necessary for the requirements of your cluster
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.. note::
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It's important the playbook you use is placed at the root of the ``ceph-ansible`` project. This is how Ansible will be able to find the roles that
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``ceph-ansible`` provides.
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Configuration Validation
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------------------------
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The ``ceph-ansible`` project provides config validation through the ``ceph-validate`` role. If you are using one of the provided playbooks this role will
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be run early in the deployment as to ensure you've given ``ceph-ansible`` the correct config. This check is only making sure that you've provided the
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proper config settings for your cluster, not that the values in them will produce a healthy cluster. For example, if you give an incorrect address for
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``monitor_address`` then the mon will still fail to join the cluster.
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An example of a validation failure might look like:
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.. code-block:: console
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TASK [ceph-validate : validate provided configuration] *************************
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task path: /Users/andrewschoen/dev/ceph-ansible/roles/ceph-validate/tasks/main.yml:3
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Wednesday 02 May 2018 13:48:16 -0500 (0:00:06.984) 0:00:18.803 *********
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[ERROR]: [mon0] Validation failed for variable: osd_objectstore
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[ERROR]: [mon0] Given value for osd_objectstore: foo
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[ERROR]: [mon0] Reason: osd_objectstore must be either 'bluestore' or 'filestore'
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fatal: [mon0]: FAILED! => {
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"changed": false
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}
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Supported Validation
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^^^^^^^^^^^^^^^^^^^^
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The ``ceph-validate`` role currently supports validation of the proper config for the following
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osd scenarios:
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- ``collocated``
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- ``non-collocated``
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- ``lvm``
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The following install options are also validated by the ``ceph-validate`` role:
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- ``ceph_origin`` set to ``distro``
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- ``ceph_origin`` set to ``repository``
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- ``ceph_origin`` set to ``local``
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- ``ceph_repository`` set to ``rhcs``
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- ``ceph_repository`` set to ``dev``
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- ``ceph_repository`` set to ``community``
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Installation methods
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--------------------
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Ceph can be installed through several methods.
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.. toctree::
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:maxdepth: 1
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installation/methods
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Configuration
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-------------
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The configuration for your Ceph cluster will be set by the use of ansible variables that ``ceph-ansible`` provides. All of these options and their default
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values are defined in the ``group_vars/`` directory at the root of the ``ceph-ansible`` project. Ansible will use configuration in a ``group_vars/`` directory
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that is relative to your inventory file or your playbook. Inside of the ``group_vars/`` directory there are many sample Ansible configuration files that relate
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to each of the Ceph daemon groups by their filename. For example, the ``osds.yml.sample`` contains all the default configuation for the OSD daemons. The ``all.yml.sample``
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file is a special ``group_vars`` file that applies to all hosts in your cluster.
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.. note::
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For more information on setting group or host specific configuration refer to the Ansible documentation: http://docs.ansible.com/ansible/latest/intro_inventory.html#splitting-out-host-and-group-specific-data
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At the most basic level you must tell ``ceph-ansible`` what version of Ceph you wish to install, the method of installation, your clusters network settings and
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how you want your OSDs configured. To begin your configuration rename each file in ``group_vars/`` you wish to use so that it does not include the ``.sample``
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at the end of the filename, uncomment the options you wish to change and provide your own value.
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An example configuration that deploys the upstream ``octopus`` version of Ceph with lvm batch method would look like this in ``group_vars/all.yml``:
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.. code-block:: yaml
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ceph_origin: repository
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ceph_repository: community
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ceph_stable_release: octopus
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public_network: "192.168.3.0/24"
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cluster_network: "192.168.4.0/24"
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monitor_interface: eth1
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devices:
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- '/dev/sda'
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- '/dev/sdb'
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The following config options are required to be changed on all installations but there could be other required options depending on your OSD scenario
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selection or other aspects of your cluster.
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- ``ceph_origin``
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- ``ceph_stable_release``
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- ``public_network``
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- ``monitor_interface`` or ``monitor_address``
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When deploying RGW instance(s) you are required to set the ``radosgw_interface`` or ``radosgw_address`` config option.
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``ceph.conf`` Configuration File
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---------------------------------
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The supported method for defining your ``ceph.conf`` is to use the ``ceph_conf_overrides`` variable. This allows you to specify configuration options using
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an INI format. This variable can be used to override sections already defined in ``ceph.conf`` (see: ``roles/ceph-config/templates/ceph.conf.j2``) or to provide
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new configuration options.
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The following sections in ``ceph.conf`` are supported:
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* ``[global]``
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* ``[mon]``
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* ``[osd]``
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* ``[mds]``
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* ``[client.rgw.{instance_name}]``
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An example:
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.. code-block:: yaml
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ceph_conf_overrides:
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global:
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foo: 1234
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bar: 5678
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osd:
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osd_mkfs_type: ext4
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.. note::
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We will no longer accept pull requests that modify the ``ceph.conf`` template unless it helps the deployment. For simple configuration tweaks
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please use the ``ceph_conf_overrides`` variable.
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Full documentation for configuring each of the Ceph daemon types are in the following sections.
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OSD Configuration
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-----------------
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OSD configuration was used to be set by selecting an OSD scenario and providing the configuration needed for
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that scenario. As of nautilus in stable-4.0, the only scenarios available is ``lvm``.
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.. toctree::
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:maxdepth: 1
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osds/scenarios
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Contribution
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============
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See the following section for guidelines on how to contribute to ``ceph-ansible``.
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.. toctree::
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:maxdepth: 1
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dev/index
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Testing
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=======
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Documentation for writing functional testing scenarios for ``ceph-ansible``.
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* :doc:`Testing with ceph-ansible <testing/index>`
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* :doc:`Glossary <testing/glossary>`
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Demos
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=====
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Vagrant Demo
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------------
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Deployment from scratch on bare metal machines: https://youtu.be/E8-96NamLDo
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Bare metal demo
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---------------
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Deployment from scratch on bare metal machines: https://youtu.be/dv_PEp9qAqg
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