forked from ungleich-public/cdist
		
	begin document cdist-stages
Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
This commit is contained in:
		
					parent
					
						
							
								3112534213
							
						
					
				
			
			
				commit
				
					
						edc82f5423
					
				
			
		
					 2 changed files with 78 additions and 63 deletions
				
			
		
							
								
								
									
										78
									
								
								doc/man/cdist-stages.text
									
										
									
									
									
										Normal file
									
								
							
							
						
						
									
										78
									
								
								doc/man/cdist-stages.text
									
										
									
									
									
										Normal file
									
								
							| 
						 | 
				
			
			@ -0,0 +1,78 @@
 | 
			
		|||
cdist-types(7)
 | 
			
		||||
===============
 | 
			
		||||
Nico Schottelius <nico-cdist--@--schottelius.org>
 | 
			
		||||
 | 
			
		||||
 | 
			
		||||
NAME
 | 
			
		||||
----
 | 
			
		||||
cdist-types - Functionality bundled
 | 
			
		||||
 | 
			
		||||
 | 
			
		||||
DESCRIPTION
 | 
			
		||||
-----------
 | 
			
		||||
   First stage: [done]
 | 
			
		||||
   - If cdist encounters type in manifest,
 | 
			
		||||
     a wrapper script is run, that creates a
 | 
			
		||||
     new entry in the cconfig database and adds
 | 
			
		||||
     attribute values. This defines a cconfig
 | 
			
		||||
     tree, that may look as follows:
 | 
			
		||||
      
 | 
			
		||||
      <hostname>/<type>/<id>/<parameters>:
 | 
			
		||||
 | 
			
		||||
      myhost/__file/cdist_bin/source
 | 
			
		||||
      myhost/__file/cdist_bin/destination
 | 
			
		||||
      ...
 | 
			
		||||
 | 
			
		||||
   - In this stage, no conflicts may occur, as
 | 
			
		||||
     no type code has been called (i.e. only
 | 
			
		||||
     manifests, which map config to hosts is
 | 
			
		||||
     applied).
 | 
			
		||||
 | 
			
		||||
   Second stage: [done]
 | 
			
		||||
   - The "init" script of every used type
 | 
			
		||||
     (i.e. the manifests created at least one object)
 | 
			
		||||
     is called, which again is able to call other
 | 
			
		||||
     types. All created objects may also be modified
 | 
			
		||||
     by the type.
 | 
			
		||||
 | 
			
		||||
     For instance a "httpd" type may call the
 | 
			
		||||
     "webroot" type with --path / ... 
 | 
			
		||||
     # FIND CASE WHERE SENSEFUL => look through
 | 
			
		||||
     current puppet config
 | 
			
		||||
 | 
			
		||||
   - The newly created objects are merged back into
 | 
			
		||||
     the existing tree. No conflicts may occur during
 | 
			
		||||
     the merge, because this would implicit that the
 | 
			
		||||
     type conflicts with other types.
 | 
			
		||||
 | 
			
		||||
     The idea of this that a type may expand another
 | 
			
		||||
     type with functionality, but may need to adjust
 | 
			
		||||
     ("overwrite") settings from the original type.
 | 
			
		||||
 | 
			
		||||
   Third stage:
 | 
			
		||||
   - Cdist calls the "gencode" binary of the types
 | 
			
		||||
     for every created object. 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 at the end of this document.
 | 
			
		||||
 | 
			
		||||
   - Cdist merges together the generated code
 | 
			
		||||
     (taking care of DEPENDENCIES (which are not
 | 
			
		||||
     yet defined (take care, double nested brackets)))
 | 
			
		||||
 | 
			
		||||
   Fourth stage:
 | 
			
		||||
   - The resulting shell script is transferred
 | 
			
		||||
     to the target and executed.
 | 
			
		||||
 | 
			
		||||
SEE ALSO
 | 
			
		||||
--------
 | 
			
		||||
 | 
			
		||||
 | 
			
		||||
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).
 | 
			
		||||
| 
						 | 
				
			
			@ -66,69 +66,6 @@ type layout:
 | 
			
		|||
      config   # binary that is called to adjust cconfig tree
 | 
			
		||||
      change   # binary that is called on the remote host?
 | 
			
		||||
--------------------------------------------------------------------------------
 | 
			
		||||
cdist view on types:
 | 
			
		||||
 | 
			
		||||
How types are integrated/run:
 | 
			
		||||
 | 
			
		||||
   First stage: [done]
 | 
			
		||||
   - If cdist encounters type in manifest,
 | 
			
		||||
     a wrapper script is run, that creates a
 | 
			
		||||
     new entry in the cconfig database and adds
 | 
			
		||||
     attribute values. This defines a cconfig
 | 
			
		||||
     tree, that may look as follows:
 | 
			
		||||
      
 | 
			
		||||
      <hostname>/<type>/<id>/<parameters>:
 | 
			
		||||
 | 
			
		||||
      myhost/__file/cdist_bin/source
 | 
			
		||||
      myhost/__file/cdist_bin/destination
 | 
			
		||||
      ...
 | 
			
		||||
 | 
			
		||||
   - In this stage, no conflicts may occur, as
 | 
			
		||||
     no type code has been called (i.e. only
 | 
			
		||||
     manifests, which map config to hosts is
 | 
			
		||||
     applied).
 | 
			
		||||
 | 
			
		||||
   Second stage: [done]
 | 
			
		||||
   - The "init" script of every used type
 | 
			
		||||
     (i.e. the manifests created at least one object)
 | 
			
		||||
     is called, which again is able to call other
 | 
			
		||||
     types. All created objects may also be modified
 | 
			
		||||
     by the type.
 | 
			
		||||
 | 
			
		||||
     For instance a "httpd" type may call the
 | 
			
		||||
     "webroot" type with --path / ... 
 | 
			
		||||
     # FIND CASE WHERE SENSEFUL => look through
 | 
			
		||||
     current puppet config
 | 
			
		||||
 | 
			
		||||
   - The newly created objects are merged back into
 | 
			
		||||
     the existing tree. No conflicts may occur during
 | 
			
		||||
     the merge, because this would implicit that the
 | 
			
		||||
     type conflicts with other types.
 | 
			
		||||
 | 
			
		||||
     The idea of this that a type may expand another
 | 
			
		||||
     type with functionality, but may need to adjust
 | 
			
		||||
     ("overwrite") settings from the original type.
 | 
			
		||||
 | 
			
		||||
   Third stage:
 | 
			
		||||
   - Cdist calls the "gencode" binary of the types
 | 
			
		||||
     for every created object. 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 at the end of this document.
 | 
			
		||||
 | 
			
		||||
   - Cdist merges together the generated code
 | 
			
		||||
     (taking care of DEPENDENCIES (which are not
 | 
			
		||||
     yet defined (take care, double nested brackets)))
 | 
			
		||||
 | 
			
		||||
   Fourth stage:
 | 
			
		||||
   - The resulting shell script is transferred
 | 
			
		||||
     to the target and executed.
 | 
			
		||||
 | 
			
		||||
--------------------------------------------------------------------------------
 | 
			
		||||
Scope of code execution on the client
 | 
			
		||||
 | 
			
		||||
   It should be assumed that the clients are pretty dumb
 | 
			
		||||
| 
						 | 
				
			
			
 | 
			
		|||
		Loading…
	
	Add table
		Add a link
		
	
		Reference in a new issue