2010-09-30 22:00:03 +02:00
|
|
|
cdist(7)
|
|
|
|
|
========
|
|
|
|
|
Nico Schottelius <nico-cdist--@--schottelius.org>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
NAME
|
|
|
|
|
----
|
|
|
|
|
cdist - Configuration distribution system
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
|
-----------
|
|
|
|
|
Cdist allows you to define centrally a configurations for
|
|
|
|
|
all systems and apply them. Cdist generally uses the push
|
|
|
|
|
approach (a server pushes out the configuration to the clients),
|
|
|
|
|
but can also be used the pull way (see cdist-push-pull(7)).
|
|
|
|
|
|
|
|
|
|
Cdist is configured in shell syntax, which is "compiled" to an
|
|
|
|
|
internal configuration representation, which again is used to
|
|
|
|
|
generate an executable, which is run on the client
|
|
|
|
|
(see cdist-language(7), cdist-design(7)).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
SEE ALSO
|
|
|
|
|
--------
|
|
|
|
|
cdist-deploy-to(1), website: http://www.nico.schottelius.org/cdist/[]
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
COPYING
|
|
|
|
|
-------
|
|
|
|
|
Copyright \(C) 2010 Nico Schottelius. Free use of this software is
|
|
|
|
|
granted under the terms of the GNU General Public License version 3 (GPLv3).
|
2010-10-28 21:13:57 +02:00
|
|
|
|
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## How cdist works
|
|
|
|
|
|
|
|
|
|
### Exploring your system
|
|
|
|
|
|
|
|
|
|
cdist analyses the system to apply the configuration on and
|
|
|
|
|
selects the right backends. You can use ***cdist-explore*** to
|
|
|
|
|
the results of the explore functions.
|
|
|
|
|
|
|
|
|
|
### Applying the configuration
|
|
|
|
|
|
|
|
|
|
cdist looks for the configuration to apply on the local host
|
|
|
|
|
and applies it using ***cdist-apply***.
|
|
|
|
|
|
|
|
|
|
### Managing many hosts
|
|
|
|
|
|
|
|
|
|
Whereas ***cdist-apply*** manages one host, ***cdist-deploy***
|
|
|
|
|
applies the configuration on enabled hosts.
|
|
|
|
|
|
|
|
|
|
## How to use cdist?
|
|
|
|
|
|
|
|
|
|
0. Create a host specification (/etc/cdist/hosts/**hostname**)
|
|
|
|
|
0. Add functionalilty to add
|
|
|
|
|
0. Run ***cdist-apply***
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
|
Simple stuff done by Unix[notm]
|
|
|
|
|
|
|
|
|
|
- DSL: Shell!
|
|
|
|
|
- gives if, else and EVEN elsif for free!
|
|
|
|
|
- and case
|
|
|
|
|
- and and and
|
|
|
|
|
- and there's no os (solaris doesn't count) without a usable /bin/sh
|
|
|
|
|
- cdist defines what you can use
|
|
|
|
|
- you _can_ use os specific stuff
|
|
|
|
|
- but it's ugly and you shoot into your own foot
|
|
|
|
|
- "manifests" (use the same name here?) will be run/sourced
|
|
|
|
|
- inheritance possible via sourcing
|
|
|
|
|
- cdist-lib always preloaded
|
|
|
|
|
- library == functions?
|
|
|
|
|
- version control via git
|
|
|
|
|
- file distribution via ssh
|
|
|
|
|
- authentication via ssh
|
|
|
|
|
- dumb clients, similar to manifest compile in puppet
|
|
|
|
|
- clients just execute commands
|
|
|
|
|
- dependencies via make?
|
|
|
|
|
- how to ensure sigletons / conflicting definitions?
|
|
|
|
|
file { "/a":
|
|
|
|
|
ensure => present,
|
|
|
|
|
file { "/a":
|
|
|
|
|
ensure => absent,
|
|
|
|
|
- matching on explored items, not only on host name?
|
|
|
|
|
- match function in host? [optional]
|
|
|
|
|
- file source:
|
|
|
|
|
- relative to specification
|
|
|
|
|
- or absolute
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
|
Implementation
|
|
|
|
|
|
|
|
|
|
"cdist-server"
|
|
|
|
|
-> called by cron?
|
|
|
|
|
-> no need to reimplement scheduling
|
|
|
|
|
"cdist-explore" (facter replacement)
|
|
|
|
|
-> running on the client
|
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
|
Requirements:
|
|
|
|
|
It MUST be incredible easy/dumb to add new types.
|
|
|
|
|
=> growable default types
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
## TO DOC
|
|
|
|
|
|
|
|
|
|
Before initial release, document:
|
|
|
|
|
|
|
|
|
|
- how to add package backends
|
|
|
|
|
- how to write a minimal host manifest
|
|
|
|
|
- create library with all functions (and their parameters)
|
|
|
|
|
- cdist_package
|
|
|
|
|
- cdist_file
|
|
|
|
|
- cdist_dir
|
|
|
|
|
|
|
|
|
|
- only do necessary work
|
|
|
|
|
- install packages only if not existent
|
|
|
|
|
- copy file only if different
|
|
|
|
|
|
|
|
|
|
- how to write a module
|
|
|
|
|
- module function autoloading via *.sh
|
|
|
|
|
- module "manifest"?
|
|
|
|
|
- create functions in *.sh
|
|
|
|
|
- name functions "modulename_function"
|
|
|
|
|
module hellow
|
|
|
|
|
function kitty
|
|
|
|
|
=> hellow_kitty
|
|
|
|
|
- you are advised (not forced) to put files
|
|
|
|
|
to a subdirectory named "files"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
