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branches/PublicaMundi_David-devel/docs/kernel/configuration.rst
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ZOO-Kernel configuration
Main configuration file
ZOO-Kernel general settings are defined in a configuration file called main.cfg. This file is stored in the same directory as ZOO-Kernel (/usr/lib/cgi-bin/ in most cases). It provides usefull metadata information on your ZOO-Kernel installation.
Warning
ZOO-Kernel (/usr/lib/cgi-bin/zoo_loader.cgi) and its configuration file (/usr/lib/cgi-bin/main.cfg) must be in the same directory.
Note
Information contained by /usr/lib/cgi-bin/main.cfg is accessible from WPS Services at runtime, so when Execute requests are used.
Default main.cfg
An example main.cfg file is given here as reference.
.. code-block:: guess :linenos: [headers] X-Powered-By=ZOO@ZOO-Project [main] version=1.0.0 encoding=utf-8 dataPath=/var/data tmpPath=/var/www/temp cacheDir=/var/www/cache sessPath=/tmp serverAddress=http://localhost/cgi-bin/zoo_loader.cgi lang=fr-FR,ja-JP language=en-US mapserverAddress=http://localhost/cgi-bin/mapserv.cgi msOgcVersion=1.0.0 tmpUrl=http:/localhost/temp/ [identification] keywords=t,ZOO-Project, ZOO-Kernel,WPS,GIS title=ZOO-Project demo instance abstract= This is ZOO-Project, the Open WPS platform. accessConstraints=none fees=None [provider] positionName=Developer providerName=GeoLabs SARL addressAdministrativeArea=False addressDeliveryPoint=1280, avenue des Platanes addressCountry=fr phoneVoice=+33467430995 addressPostalCode=34970 role=Dev providerSite=http://geolabs.fr phoneFacsimile=False addressElectronicMailAddress=gerald@geolabs.fr addressCity=Lattes individualName=Gerald FENOY
Main section
The main.cfg [main] section parameters are explained bellow.
- version: Supported WPS version.
- encoding: Default encoding of WPS Responses.
- dataPath: Path to the directory where data files are stored (used to store mapfiles and data when MapServer support is activated).
- tmpPath: Path to the directory where temporary files are stored (such as ExecuteResponse when storeExecuteResponse is set to true).
- cacheDir: Path to the directory where cached request files [1] are stored (optional).
- serverAddress: URL to the ZOO-Kernel instance.
- tmpUrl: URL of the temporary files directory.
- mapservAddress: URL to the MapServer instance (optional).
- msOgcVersion: Version of all supported OGC Web Services output [2] (optional).
- lang: Supported natural languages separated by a coma (the first is the default one),
Identification and Provider
The [identification] and [provider] sections are not ZOO-Project specific. They provide OGC metadata [3] and should be set according to the XML Schema Document which encodes the parts of ISO 19115 used by the common ServiceIdentification and ServiceProvider sections of the GetCapabilities operation response, known as the service metadata XML document.
Details of the common OWS 1.1.0 ServiceIdentification section can be found in this XML Schema Document.
Details of the common OWS 1.1.0 ServiceProvider section can be found in this XML Schema Document.
Additional sections
Headers section
The [headers] section can be set in order to define a specific HTTP Response header, which will be used for every response. As an example, you can check http://zoo-project.org using curl command line tool and notice the specific header X-Powered-By: Zoo-Project@Trac.
env section
The [env] section can be used to store specific environment variables to be set prior the loading of Services Provider and Service execution.
A typical example is when a Service requires the access to a X server running on framebuffer, which takes to set the DISPLAY environnement variable, as follow:
.. code-block:: guess :linenos: [env] DISPLAY=:1
lenv section
The lenv can be used to store runtime informations automatically set by ZOO-Kernel before and during the execution of a WPS service, with the following parameters:
- sid (r): The WPS Service unique identifier,
- status (rw): The current progress value ( a value between 0 and 100 in percent (%) ),
- cwd (r): The current working directory of ZOO-Kernel,
- message (rw): An error message used when SERVICE_FAILED is returned (optional),
- cookie (rw): The cookie to be returned to the client (for example for authentication purpose).
senv section
The senv section can be used to store sessions information on the server side. Such information can then be accessed automatically from the Service if the server is requested using a valid cookie (as defined in lenv section). ZOO-Kernel will store the values set in the senv maps on disk, load it and dynamically replace its content to the one in the main.cfg. The senv section must contain the following parameter at least:
- XXX: The session unique identifier where XXX is the name included in the cookie which is returned.
conf["lenv"]["cookie"]="XXX=XXX1000000; path=/" conf["senv"]={"XXX": "XXX1000000","login": "demoUser"}
means that ZOO-Kernel will create a file named sess_XXX1000000.cfg in the cacheDir directory, and will return the specified cookie to the client. Each time the client will request ZOO-Kernel using this cookie, it will automatically load the value stored before the Service execution.
Database section
The database section allows to configure the :ref:`ZOO-Kernel optional database support <zoo_install_db_backend>`.
This will generate strings to be passed to GDAL to connect the database server:
With the previous database section, it will give the following:
Please refer to this section to learn how to setup the database.
Footnotes
[1] | If GET requests are passed through xlink:href to the ZOO-Kernel , the latter will execute the request the first time and store the result on disk. The next time the same request is executed, the cached file will be used and this will make your process run much faster. If cachedir was not specified in the main.cfg then the tmpPath value will be used. |
[2] | Usefull when the :ref:`kernel-mapserver` is activated (available since ZOO-Project version 1.3.0). |
[3] | ZOO-Kernel and MapServer are sharing the same metadata for OGC Web Services if the :ref:`kernel-mapserver` is activated. |