varnish-formula

A simple saltstack formula to install and configure Varnish.

This formula has been developed distributing id and state declarations in different files to make it usable in most situations. It should be useful in scenarios ranging from a simple install of the packages (without any special configuration) to a more complex set-up.

General customization strategies

Use pillar data. This is the absolutely recommended way to use the formula. In most occassions all you need is to fill some of the key-values shown in the pillar.example file. If you feel that a certain value should be there then don't hesitate to propose an enhancement.
Use the extra_conf key that in some cases is present in the pillar to add arbitrary configuration lines in the templates provided. This is a way to have a better customization without over-populating the pillar with new key-values.
Add new subdirectories under files in addition to default. This new subdirectories will contain different files to be used in certain conditions. This selection mechanism is based by default in the ìd grain of the minion (i.e. if there's a new subdirectory named minion01 then the formula is going to look there first for that minion). This selection behavior can be extended to make it depend on any sorted list of grains, defined by the key files_switch.

For example, let's define in pillar something like:
```
formula-name:
  files_switch: ['id', 'os_family']
```
Let's have this files directory structure:
```
files
  |-- minion01
  |       `-- etc
  |            `-- foo.conf.jinja
  |-- Debian
  |       `-- etc
  |            `-- foo.conf.jinja
  `-- default
          |-- etc
          |    |-- foo.conf.jinja
          |    `-- bar.conf.jinja
          `-- usr/share/thingy/*
```
With this, we have the following:
- if the minion id is minion01 then files/minion01/etc/foo.conf.jinja is going to be used
- else if the minion os_family is Debian then files/Debian/etc/foo.conf.jinja is going to be used
- else files/default/etc/foo.conf.jinja is going to be used
Beware: this is not designed to substitute pillar data. Remember that pillar has to be used for information that it's essential to be only known for a certain set of minions (i.e. passwords, private keys and such).
As a last resort you can actually fork the formula to suit your needs, keeping an eye for further improvements to merge into yours. Of course any pull- request that you can bring back it would be taken in account ;-)