cdist-backup/doc/man/cdist-stages.text
Nico Schottelius e43e910012 define stages
Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
2011-02-07 23:07:43 +01:00

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cdist-stages(7)
===============
Nico Schottelius <nico-cdist--@--schottelius.org>
NAME
----
cdist-stages - How the configuration is built
DESCRIPTION
-----------
Starting the execution of deployment with cdist-deploy-to(1),
cdist passes through different stages:
- First stage: Get information about target
Every existing explorer (see cdist-explorers(7) is run on
the target and the results are copied back into the local
cache (see cdist-cache(7)). These values can be used by
manifests and types.
- Second stage: Initial manifest run
The initial manifest (see cdist-manifests(7) is run,
which is done by cdist-manifest-init(1).
This run creates an internal database in cconfig
format (see cdist-config-layout(7), that contains all
objects configured for the specific host.
In this stage, no conflicts may occur, i.e. no
object of the same type with the same id may
be created.
You can trigger the first stage part using
cdist-manifest-init(1).
- Third stage: Execution of types
Every object is checked whether its type has an init
script (see cdist-types(7)). If the type of the object
has an init script, it is run. This init script may
generate additional objects.
For instance the object __apache/www.test.ch is of
type __apache, which may contain an init script, which
creates new objects of type __file.
The newly created objects are merged back into
the existing tree. No conflicts may occur during
the merge. A conflict would mean that two different
objects try to create the same object, which indicates a
broken configuration.
- Third stage: Code generation
The "gencode" binary of the types for every existing object is
called to generate code that will be executed on the target host.
This binary should create code to be executed on the target on stdout.
If the gencode binary fails, it must print diagnostic messages on stderr
and exit non-zero.
A description of what the generated code may/must/should
do can be found in cdist-types-gencode(7).
- Fourth stage:
The resulting code is transferred to the target host and executed,
the run of cdist-deploy-to(1) ends.
SEE ALSO
--------
cdist(7), cdist-deploy-to(1), cdist-config-layout(7), cdist-manifest-init(1)
COPYING
-------
Copyright \(C) 2010-2011 Nico Schottelius. Free use of this software is
granted under the terms of the GNU General Public License version 3 (GPLv3).