add first hint on the language
Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
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Nico Schottelius
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cdist(7)
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========
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cdist-language(7)
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=================
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Nico Schottelius <nico-cdist--@--schottelius.org>
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NAME
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----
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cdist - Configuration distribution system
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cdist-language - Cdist Configuration language
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DESCRIPTION
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-----------
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Cdist allows you to define centrally a configurations for
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all systems and apply them. Cdist generally uses the push
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approach (a server pushes out the configuration to the clients),
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but can also be used the pull way (see cdist-push-pull(7)).
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A cdist configuration consists of the following parts:
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Cdist is configured in shell syntax, which is "compiled" to an
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internal configuration representation (cconfig), which again
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is used to generate an executable, which is run on the client
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(see cdist-language(7), cdist-design(7)).
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- host definitions (cdist-language-hosts(7))
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- library (cdist-language-library(7))
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- modules (cdist-language-modules(7))
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In short the configuration is built as follows:
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- conf/hosts/init is executed, the resulting output is used for module loading
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- the appropriate modules are loaded and executed, which
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- use library functions.
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The three stages are used to seperate configurations:
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- hosts contain mappings to created modules
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- modules create (probably site specific) configurations using library collections
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- the library is shipped with cdist, but can be extendet locally
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SEE ALSO
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--------
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cdist-deploy-to(1), website: http://www.nico.schottelius.org/cdist/[]
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COPYING
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-------
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Copyright \(C) 2010 Nico Schottelius. Free use of this software is
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granted under the terms of the GNU General Public License version 3 (GPLv3).
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--------------------------------------------------------------------------------
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## How cdist works
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### Exploring your system
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cdist analyses the system to apply the configuration on and
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selects the right backends. You can use ***cdist-explore*** to
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the results of the explore functions.
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### Applying the configuration
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cdist looks for the configuration to apply on the local host
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and applies it using ***cdist-apply***.
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### Managing many hosts
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Whereas ***cdist-apply*** manages one host, ***cdist-deploy***
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applies the configuration on enabled hosts.
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## How to use cdist?
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0. Create a host specification (/etc/cdist/hosts/**hostname**)
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0. Add functionalilty to add
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0. Run ***cdist-apply***
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--------------------------------------------------------------------------------
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Simple stuff done by Unix[notm]
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- DSL: Shell!
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- gives if, else and EVEN elsif for free!
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- and case
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- and and and
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- and there's no os (solaris doesn't count) without a usable /bin/sh
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- cdist defines what you can use
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- you _can_ use os specific stuff
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- but it's ugly and you shoot into your own foot
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- "manifests" (use the same name here?) will be run/sourced
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- inheritance possible via sourcing
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- cdist-lib always preloaded
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- library == functions?
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- version control via git
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- file distribution via ssh
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- authentication via ssh
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- dumb clients, similar to manifest compile in puppet
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- clients just execute commands
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- dependencies via make?
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- how to ensure sigletons / conflicting definitions?
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file { "/a":
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ensure => present,
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file { "/a":
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ensure => absent,
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- matching on explored items, not only on host name?
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- match function in host? [optional]
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- file source:
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- relative to specification
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- or absolute
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--------------------------------------------------------------------------------
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Implementation
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"cdist-server"
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-> called by cron?
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-> no need to reimplement scheduling
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"cdist-explore" (facter replacement)
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-> running on the client
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--------------------------------------------------------------------------------
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Requirements:
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It MUST be incredible easy/dumb to add new types.
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=> growable default types
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--------------------------------------------------------------------------------
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## TO DOC
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Before initial release, document:
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- how to add package backends
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- how to write a minimal host manifest
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- create library with all functions (and their parameters)
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- cdist_package
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- cdist_file
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- cdist_dir
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- only do necessary work
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- install packages only if not existent
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- copy file only if different
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- how to write a module
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- module function autoloading via *.sh
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- module "manifest"?
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- create functions in *.sh
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- name functions "modulename_function"
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module hellow
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function kitty
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=> hellow_kitty
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- you are advised (not forced) to put files
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to a subdirectory named "files"
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