Install and start the memcached service
Note
See the full Salt Formulas installation and usage instructions.
Installs and starts memcached service
Memcached configuration file
Installs python-memcached
package for RedHat/CentOS and python-memcache
package for Debian
Installs libmemcached development files to install pylibmc
as python driver
Add this repository as a GitFS backend in your Salt master config.
Determine which minions will run memcached and
include
thememcached
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
(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".
Configure your Pillar top file (
/srv/pillar/top.sls
):base: 'web*': - application_server
Configure Salt Mine in
/srv/pillar/application_server.sls
:mine_functions: network.interfaces: [eth0]
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 ofconfig.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 %} ] } }