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Saltclass Configuration
=======================
.. code-block:: yaml
master_tops:
saltclass:
path: /srv/saltclass
Description
===========
This module clones the behaviour of reclass (http://reclass.pantsfullofunix.net/),
without the need of an external app, and add several features to improve flexibility.
Saltclass lets you define your nodes from simple ``yaml`` files (``.yml``) through
hierarchical class inheritance with the possibility to override pillars down the tree.
Features
========
- Define your nodes through hierarchical class inheritance
- Reuse your reclass datas with minimal modifications
- applications => states
- parameters => pillars
- Use Jinja templating in your yaml definitions
- Access to the following Salt objects in Jinja
- ``__opts__``
- ``__salt__``
- ``__grains__``
- ``__pillars__``
- ``minion_id``
- Chose how to merge or override your lists using ^ character (see examples)
- Expand variables ${} with possibility to escape them if needed \${} (see examples)
- Ignores missing node/class and will simply return empty without breaking the pillar module completely - will be logged
An example subset of datas is available here: http://git.mauras.ch/salt/saltclass/src/master/examples
========================== ===========
Terms usable in yaml files Description
========================== ===========
classes A list of classes that will be processed in order
states A list of states that will be returned by master_tops function
pillars A yaml dictionnary that will be returned by the ext_pillar function
environment Node saltenv that will be used by master_tops
========================== ===========
A class consists of:
- zero or more parent classes
- zero or more states
- any number of pillars
A child class can override pillars from a parent class.
A node definition is a class in itself with an added ``environment`` parameter for ``saltenv`` definition.
Class names
===========
Class names mimic salt way of defining states and pillar files.
This means that ``default.users`` class name will correspond to one of these:
- ``<saltclass_path>/classes/default/users.yml``
- ``<saltclass_path>/classes/default/users/init.yml``
Saltclass file hierachy
=======================
A saltclass tree would look like this:
.. code-block:: text
<saltclass_path>
├── classes
│ ├── app
│ │ ├── borgbackup.yml
│ │ └── ssh
│ │ └── server.yml
│ ├── default
│ │ ├── init.yml
│ │ ├── motd.yml
│ │ └── users.yml
│ ├── roles
│ │ ├── app.yml
│ │ └── nginx
│ │ ├── init.yml
│ │ └── server.yml
│ └── subsidiaries
│ ├── gnv.yml
│ ├── qls.yml
│ └── zrh.yml
└── nodes
├── geneva
│ └── gnv.node1.yml
├── lausanne
│ ├── qls.node1.yml
│ └── qls.node2.yml
├── node127.yml
└── zurich
├── zrh.node1.yml
├── zrh.node2.yml
└── zrh.node3.yml
Saltclass Examples
==================
``<saltclass_path>/nodes/lausanne/qls.node1.yml``
.. code-block:: jinja
environment: base
classes:
{% for class in ['default'] %}
- {{ class }}
{% endfor %}
- subsidiaries.{{ __grains__['id'].split('.')[0] }}
``<saltclass_path>/classes/default/init.yml``
.. code-block:: yaml
classes:
- default.users
- default.motd
states:
- openssh
pillars:
default:
network:
dns:
srv1: 192.168.0.1
srv2: 192.168.0.2
domain: example.com
ntp:
srv1: 192.168.10.10
srv2: 192.168.10.20
``<saltclass_path>/classes/subsidiaries/gnv.yml``
.. code-block:: yaml
pillars:
default:
network:
sub: Geneva
dns:
srv1: 10.20.0.1
srv2: 10.20.0.2
srv3: 192.168.1.1
domain: gnv.example.com
users:
adm1:
uid: 1210
gid: 1210
gecos: 'Super user admin1'
homedir: /srv/app/adm1
adm3:
uid: 1203
gid: 1203
gecos: 'Super user adm
Variable expansions
===================
Escaped variables are rendered as is: ``${test}``
Missing variables are rendered as is: ``${net:dns:srv2}``
.. code-block:: yaml
pillars:
app:
config:
dns:
srv1: ${default:network:dns:srv1}
srv2: ${net:dns:srv2}
uri: https://application.domain/call?\${test}
prod_parameters:
- p1
- p2
- p3
pkg:
- app-core
- app-backend
List override
=============
Not using ``^`` as the first entry will simply merge the lists
.. code-block:: yaml
pillars:
app:
pkg:
- ^
- app-frontend
.. note:: **Known limitation**
Currently you can't have both a variable and an escaped variable in the same string as the
escaped one will not be correctly rendered - '\${xx}' will stay as is instead of being rendered as '${xx}'
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