Commit 8372fb62 authored by Cédric Le Ninivin's avatar Cédric Le Ninivin

apache-frontend: add README information on replicate type

parent 1b6277c5
......@@ -15,6 +15,24 @@ Apache frontend is available in 3 software types:
* default : The standard way to use the apache frontend configuring everything with a few given parameters
* custom-personal : This software type allow each slave to edit its apache configuration file
* custom-group : This software type use a template given as a parameter on master instance to generate apache configuration for all slaves
* replicate : This software type is set to replicate any kind of apache
About replicate frontend
========================
Slaves of the root instance (type "replicate") are sent as a parameter to requested frontends which will process them. The only difference is that they will then return the « would-be published information » to the root instance instead of publishing it. The root instance will then do a synthesis and publish the information to its slaves. The replicate instance only use 3 type of parameters for itself and will transmit the rest to requested frontends.
These parameters are :
* "-frontend-type" : the type to deploy frontends with. (default to 2)
* "-frontend-quantity" : The quantity of frontends to request (default to "default")
* "-sla-i-foo" : where "i" is the number of the concerned frontend (between 1 and "-frontend-quantity") and "foo" a sla parameter.
ex:
<parameter id="-frontend-quantity">3</parameter>
<parameter id="-frontend-type">custom-personal</parameter>
<parameter id="-sla-3-computer_guid">COMP-1234</parameter>
will request the third frontend on COMP-1234. All frontends will be of software type "custom-personal".
Note: the way slaves are transformed to a parameter avoid modifying more than 3 lines in the frontend logic.
Important NOTE: The way you ask for slave to a replicate frontend is the same as the one you would use for the software given in "-frontend-quantity". Do not forget to use "replicate" for software type. XXXXX So far it is not possible to do a simple request on a replicate frontend if you do not know the software_guid or other sla-parameter of the master instance. In fact we do not know yet the software type of the "requested" frontends. TO BE IMPLEMENTED
How to deploy a frontend server
===============================
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