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102 lines
3.6 KiB
ReStructuredText
102 lines
3.6 KiB
ReStructuredText
.. _file-server-backends:
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====================
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File Server Backends
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====================
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In Salt 0.12.0, the modular fileserver was introduced. This feature added the
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ability for the Salt Master to integrate different file server backends. File
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server backends allow the Salt file server to act as a transparent bridge to
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external resources. A good example of this is the :mod:`git
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<salt.fileserver.git>` backend, which allows Salt to serve files sourced from
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one or more git repositories, but there are several others as well. Click
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:ref:`here <all-salt.fileserver>` for a full list of Salt's fileserver
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backends.
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Enabling a Fileserver Backend
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-----------------------------
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Fileserver backends can be enabled with the :conf_master:`fileserver_backend`
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option.
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.. code-block:: yaml
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fileserver_backend:
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- git
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See the :ref:`documentation <all-salt.fileserver>` for each backend to find the
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correct value to add to :conf_master:`fileserver_backend` in order to enable
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them.
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Using Multiple Backends
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-----------------------
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If :conf_master:`fileserver_backend` is not defined in the Master config file,
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Salt will use the :mod:`roots <salt.fileserver.roots>` backend, but the
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:conf_master:`fileserver_backend` option supports multiple backends. When more
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than one backend is in use, the files from the enabled backends are merged into a
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single virtual filesystem. When a file is requested, the backends will be
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searched in order for that file, and the first backend to match will be the one
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which returns the file.
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.. code-block:: yaml
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fileserver_backend:
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- roots
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- git
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With this configuration, the environments and files defined in the
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:conf_master:`file_roots` parameter will be searched first, and if the file is
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not found then the git repositories defined in :conf_master:`gitfs_remotes`
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will be searched.
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Environments
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------------
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Just as the order of the values in :conf_master:`fileserver_backend` matters,
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so too does the order in which different sources are defined within a
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fileserver environment. For example, given the below :conf_master:`file_roots`
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configuration, if both ``/srv/salt/dev/foo.txt`` and ``/srv/salt/prod/foo.txt``
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exist on the Master, then ``salt://foo.txt`` would point to
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``/srv/salt/dev/foo.txt`` in the ``dev`` environment, but it would point to
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``/srv/salt/prod/foo.txt`` in the ``base`` environment.
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.. code-block:: yaml
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file_roots:
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base:
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- /srv/salt/prod
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qa:
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- /srv/salt/qa
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- /srv/salt/prod
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dev:
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- /srv/salt/dev
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- /srv/salt/qa
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- /srv/salt/prod
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Similarly, when using the :mod:`git <salt.fileserver.gitfs>` backend, if both
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repositories defined below have a ``hotfix23`` branch/tag, and both of them
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also contain the file ``bar.txt`` in the root of the repository at that
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branch/tag, then ``salt://bar.txt`` in the ``hotfix23`` environment would be
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served from the ``first`` repository.
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.. code-block:: yaml
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gitfs_remotes:
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- https://mydomain.tld/repos/first.git
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- https://mydomain.tld/repos/second.git
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.. note::
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Environments map differently based on the fileserver backend. For instance,
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the mappings are explicitly defined in :mod:`roots <salt.fileserver.roots>`
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backend, while in the VCS backends (:mod:`git <salt.fileserver.gitfs>`,
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:mod:`hg <salt.fileserver.hgfs>`, :mod:`svn <salt.fileserver.svnfs>`) the
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environments are created from branches/tags/bookmarks/etc. For the
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:mod:`minion <salt.fileserver.minionfs>` backend, the files are all in a
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single environment, which is specified by the :conf_master:`minionfs_env`
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option.
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See the documentation for each backend for a more detailed explanation of
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how environments are mapped.
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