salt/doc/ref/configuration/master.rst

===========================
Configuring the Salt Master
===========================

The Salt system is amazingly simple and easy to configure, the two components
of the Salt system each have a respective configuration file. The
:command:`salt-master` is configured via the master configuration file, and the
:command:`salt-minion` is configured via the minion configuration file.

.. seealso:: 
    :ref:`example master configuration file <configuration-examples-master>` 

The configuration file for the salt-master is located at
:file:`/etc/salt/master`. The available options are as follows:

Primary Master Configuration
----------------------------

.. conf_master:: interface

``interface``
-------------

Default: ``0.0.0.0`` (all interfaces)

The local interface to bind to.

.. code-block:: yaml

    interface: 192.168.0.1

.. conf_master:: publish_port

``publish_port``
----------------

Default: ``4505``

The network port to set up the publication interface

.. code-block:: yaml

    publish_port: 4505

.. conf_master:: worker_threads

``worker_threads``
------------------

Default: ``5``

The number of threads to start for receiving commands and replies from minions.
If minions are stalling on replies because you have many minions, raise the
worker_threads value.

.. code-block:: yaml

    worker_threads: 5

.. conf_master:: ret_port

``ret_port``
------------

Default: ``4506``

The port used by the return server, this is the server used by Salt to receive
execution returns and command executions.

.. code-block:: yaml

    ret_port: 4506

.. conf_master:: root_dir

``root_dir``
------------

Default: :file:`/`

The system root direcotry to oporate from, change this to make Salt run from
an alternative root

.. code_block:: yaml

    root_dir: /

.. conf_master:: pki_dir

``pki_dir``
-----------

Default: :file:`/etc/salt/pki`

The directory to store the pki authentication keys.

.. code-block:: yaml

    pki_dir: /etc/salt/pki

.. conf_master:: cachedir

``cachedir``
------------

Default: :file:`/var/cache/salt`

The location used to store cache information, particularly the job information
for executed salt commands.

.. code-block:: yaml

    cachedir: /var/cache/salt

.. conf_master:: keep_jobs

``keep_jobs``
-------------

Default: ``24``

Set the number of hours to keep old job information

.. conf_master:: sock_dir

``sock_dir``
------------

Default:: :file:`/tmp/salt-unix`

Set the location to use for creating Unix sockets for master process
communication

Master Security Settings
------------------------

.. conf_master:: open_mode

``open_mode``
-------------

Default: ``False``

Open mode is a dangerous security feature. One problem encountered with pki
authentication systems is that keys can become "mixed up" and authentication
begins to fail. Open mode turns off authentication and tells the master to
accept all authentication. This will clean up the pki keys received from the
minions. Open mode should not be turned on for general use, open mode should
only be used for a short period of time to clean up pki keys. To turn on open
mode the value passed must be ``True``.

.. code-block:: yaml

    open_mode: False

.. conf_master:: auto_accept

``auto_accept``
---------------

Default: ``False``

Enable auto_accept, this setting will automatically accept all incoming
public keys from the minions

.. code-block:: yaml

    auto_accept: False

Master State System Settings
----------------------------

.. conf_master:: state_top

``state_top``
-------------

Default: ``top.sls``

The state system uses a "top" file to tell the minions what environment to
use and what modules to use. The state_top file is defined relative to the
root of the base environment

.. code-block:: yaml

    state_top: top.sls

.. conf_master:: renderer

``renderer``
------------

Default: ``yaml_jinja``

The renderer to use on the minions to render the state data

.. code-block:: yaml

    renderer: yaml_jinja

.. conf_master:: failhard

Default:: ``False``

Set the global failhard flag, this informs all states to stop running states
at the moment a single state fails

.. code-block:: yaml

    failhard: False

Master File Server Settings
---------------------------

.. conf_master:: file_roots

``file_roots``
--------------

Default: ``base: [/srv/salt]``

Salt runs a lightweight file server written in zeromq to deliver files to
minions. This file server is built into the master daemon and does not
require a dedicated port.
The file server works on environments passed to the master, each environment
can have multiple root directories, the subdirectories in the multiple file
roots cannot match, otherwise the downloaded files will not be able to be
reliably ensured. A base environment is required to house the top file
Example:

.. code-block:: yaml

    file_roots:
      base:
        - /srv/salt/
      dev:
        - /srv/salt/dev/services
        - /srv/salt/dev/states
      prod:
        - /srv/salt/prod/services
        - /srv/salt/prod/states

.. code-block:: yaml

    base:
      - /srv/salt

.. conf_master:: hash_type

``hash_type``
-------------

Default: ``md5``

The hash_type is the hash to use when discovering the hash of a file on
the master server, the default is md5, but sha1, sha224, sha256, sha384
and sha512 are also supported.

.. code-block:: yaml

    hash_type: md5

.. conf_master:: file_buffer_size

``file_buffer_size``
--------------------

Default: ``1048576``

The buffer size in the file server in bytes

.. code-block:: yaml

    file_buffer_size: 1048576

Syndic Server Settings
----------------------

The Salt syndic is used to pass commands through a master from a higher
master. Using the syndic is simple, if this is a master that will have
syndic servers(s) below it set the "order_masters" setting to True, if this
is a master that will be running a syndic daemon for passthrough the
"syndic_master" setting needs to be set to the location of the master server
to recieve commands from

.. conf_master:: order_masters

``order_masters``
-----------------

Default: ``False``

Extra data needs to be sind with publications if the master os controlling a
lower level master via a syndic minion. If this is the case the order_masters
value must be set to True

.. code-block:: yaml

    order_masters: False

.. conf_master:: syndic_master

``syndic_master``
-----------------

Default: ``None``

If this master will be running a salt-syndic to connect to a higher level
master specify the higher level master with this configuration value

.. code-block:: yaml

    syndic_master: masterofmasters

Peer Publish Settings
---------------------

Salt minions can send commands to other minions, but only if the minion is
allowed to. By default "Peer Publication" is disabled, and when enabled it
is enabled for specific minions and specific commands. This allows secure
compartmentalization of commands based on individual minions.

.. conf_master:: peer

``peer``
--------

Default: ``{}``

The configuration uses regular expressions to match minions and then a list
of regular expressions to match functions, the following will allow the
minion authenticated as foo.example.com to execute functions from the test
and pkg modules

.. code-block:: yaml

    peer:
      foo.example.com:
          - test.*
          - pkg.*

This will allow all minions to execute all commands:

.. code-block:: yaml

    peer:
      .*:
          - .*

This is not recomanded, since it would allow anyone who gets root on any
single minion to instantly have root on all of the minions!

Node Groups
-----------

.. conf_master:: nodegroups

Default: ``{}``

Node groups allow for logical groupings of minion nodes.
A group consists of a group name and a compound target.

.. code-block:: yaml

    nodegroups:
      group1: 'L@foo.domain.com,bar.domain.com,baz.domain.com and bl*.domain.com'
      group2: 'G@os:Debian and foo.domain.com'

Master Logging Settings
-----------------------

.. conf_master:: log_file

``log_file``
------------

Default: :file:`/var/log/salt/master`

The location of the master log file

.. code-block:: yaml

    log_file: /var/log/salt/master

.. conf_master:: log_level

``log_level``
-------------

Default: ``warning``

The level of messages to send to the log file.
One of 'info', 'quiet', 'critical', 'error', 'debug', 'warning'.

.. code-block:: yaml

    log_level: warning

.. conf_master:: log_granular_levels

``log_granular_levels``
-----------------------

Default: ``{}``

Logger levels can be used to tweak specific loggers logging levels.
Imagine you want to have the salt library at the 'warning' level, but, you
still wish to have 'salt.modules' at the 'debug' level:

.. code-block:: yaml

  log_granular_levels:
    'salt': 'warning',
    'salt.modules': 'debug'