memcached

Install and start the memcached service

Instructions

1. Add this repository as a GitFS backend in your Salt master config.

2. Determine which minions will run memcached and include the memcached state.

   One possible example is to run memcached on each server that is also running your web application. The following contrived example uses a Django web app deployed from an internal Git repository:

   include:
     - memcached
     - memcached.python_memcached
   
   python-django:
     pkg:
       - installed
   
   https://internal-repos/mydjangoapp.git:
     git.latest:
       - target: /var/www/mydjangoapp
       - require:
         - pkg: python-django
         - pkg: python-memcached
   

3. (Optional) Use Salt Mine to maintain a live list of currently running memcached instances in your web application config.

   The following example assumes all web application servers have a hostname that starts with "web".

   1. Configure your Pillar top file (/srv/pillar/top.sls):

      base:
        'web*':
          - application_server
      

   2. Configure Salt Mine in /srv/pillar/application_server.sls:

      mine_functions:
        network.interfaces: [eth0]
      

   3. Add the IP addresses to your web application config.

      Building on the Django example above, add the following states:

      /var/www/mydjangoapp/config.py:
        file:
          - managed
          - source: salt://mydjangoapp/config.py
          - template: jinja
          - require:
            - git: https://internal-repos/mydjangoapp.git
      

      Edit the /srv/salt/mydjangoapp/config.py template to add the memcached server addresses (only relevant portions of config.py are shown):

      CACHES = {
          'default': {
              'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
              'LOCATION': [
                  {% for server,ip in salt['mine.get']('web*', 'network.interfaces', ['eth0']).items() %}
                  '{{ ip }}:11211`,
                  {% endfor %}
              ]
          }
      }