114 lines
3.1 KiB
ReStructuredText
114 lines
3.1 KiB
ReStructuredText
memcached
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=========
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Install and start the memcached service
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.. note::
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See the full `Salt Formulas installation and usage instructions
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<http://docs.saltstack.com/en/latest/topics/development/conventions/formulas.html>`_.
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Available states
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================
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.. contents::
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:local:
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``memcached``
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-------------
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Installs and starts memcached service
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``memcached.config``
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--------------------
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Memcached configuration file
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``memcached.python_memcached``
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------------------------------
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Installs ``python-memcached`` package for RedHat/CentOS and ``python-memcache`` package for Debian
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``memcached.libmemcached``
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--------------------
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Installs libmemcached development files to install ``pylibmc`` as python driver
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``memcached.uninstall``
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-------------
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Stops the memcached service and uninstalls the package.
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Instructions
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============
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1. Add this repository as a `GitFS backend`_ in your Salt master config.
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2. Determine which minions will run memcached and ``include`` the
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``memcached`` state.
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One possible example is to run memcached on each server that is also
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running your web application. The following contrived example uses a Django
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web app deployed from an internal Git repository::
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include:
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- memcached
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- memcached.python_memcached
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python-django:
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pkg:
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- installed
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https://internal-repos/mydjangoapp.git:
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git.latest:
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- target: /var/www/mydjangoapp
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- require:
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- pkg: python-django
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- pkg: python-memcached
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3. (Optional) Use Salt Mine to maintain a live list of currently running
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memcached instances in your web application config.
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The following example assumes all web application servers have a hostname
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that starts with "web".
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1. Configure your Pillar top file (``/srv/pillar/top.sls``)::
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base:
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'web*':
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- application_server
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2. Configure Salt Mine in ``/srv/pillar/application_server.sls``::
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mine_functions:
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network.interfaces: [eth0]
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3. Add the IP addresses to your web application config.
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Building on the Django example above, add the following states::
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/var/www/mydjangoapp/config.py:
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file:
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- managed
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- source: salt://mydjangoapp/config.py
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- template: jinja
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- require:
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- git: https://internal-repos/mydjangoapp.git
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Edit the ``/srv/salt/mydjangoapp/config.py`` template to add the
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memcached server addresses (only relevant portions of ``config.py`` are
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shown)::
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CACHES = {
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'default': {
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'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
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'LOCATION': [
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{% for server,ip in salt['mine.get']('web*', 'network.interfaces', ['eth0']).items() %}
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'{{ ip }}:11211`,
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{% endfor %}
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]
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}
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}
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.. _`GitFS backend`: http://docs.saltstack.com/topics/tutorials/gitfs.html
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