[mapserver-users] Re: Reloading MapCache configuration file on changes?

[thomas bonfort]

kept in memory accross the lifetime of the process. the conf file is
accessed at each request to check it's modification time though if you
have enabled auto reloading.

--
tb

On Wed, Feb 22, 2012 at 12:00, Pavel Iacovlev <iacovlev.pavel at gmail.com> wrote:
> Thank you for the sudo rule suggestion and for detailed explanation!
>
> Just one more question, if I use MapCache as fcgi, does this mean that on
> every request the configuration will be read and parsed ? or the
> configuration will be kept in memory until a the fastcgi process killed
> and respawned ?
>
>
> On Wed, Feb 22, 2012 at 12:37 PM, thomas bonfort <tbonfort at terriscope.fr>
> wrote:
>>
>> On Wed, Feb 22, 2012 at 11:22, Pavel Iacovlev <iacovlev.pavel at gmail.com>
>> wrote:
>> > apache2ctl -k graceful is not really an option for me because I would
>> > have
>> > to give root privileges to my apache/php.
>> you can create a sudo rule that only allows a user to run apache2ctl
>> -k graceful without giving full root access.
>>
>> >
>> > "AFAIK, this isn't possible." I don't know anything about apache modules
>> > and
>> > stuff so the next thing I say may not be applicable or just plain
>> > stupid,
>> > but maybe each process will hold their own copy of configuration so the
>> > apache process will be able to alter it's configuration upon detection
>> > of
>> > file change. There is certainly that added overhead of "checking last
>> > modified date" and keeping more copies in memory, but this should not be
>> > the
>> > default behavior.
>>
>> afaik, at the request level (which is were the freshness test would
>> occur), there's no way of freeing the memory that allocated the
>> initial configuration, and no way of allocating memory for the new
>> configuration that would live across the upcoming requests.
>>
>> >
>> > On Tue, Dec 6, 2011 at 1:00 PM, thomas bonfort <tbonfort at terriscope.fr>
>> > wrote:
>> >>
>> >> AFAIK, this isn't possible. Inside an apache module, the configuration
>> >> is considered read-only as it is shared between multiple worker
>> >> threads/processed spawned by httpd.
>> >>
>> >> apachectl configtest && apachectl graceful will restart the server
>> >> gracefully, i.e. without aborting ongoing requests, and will load the
>> >> new configuration for subsequent requests.
>> >>
>> >> --
>> >> thomas
>> >>
>> >> On Mon, Dec 5, 2011 at 23:37, John Taranu
>> >> <jtaranu at firstbasesolutions.com> wrote:
>> >> > Thomas,
>> >> >
>> >> >
>> >> >
>> >> > Is there a better way force MapCache to reload its configuration
>> >> > script
>> >> > than
>> >> > restarting apache?  I’m working on an application that will use two
>> >> > load-balanced web servers running MapCache, all pointing to a single
>> >> > central
>> >> > tile repository and a single central .xml configuration file.  The
>> >> > configuration file will occasionally be edited, either with deletions
>> >> > or
>> >> > additional tilesets.  Both web servers need to reload the updated
>> >> > configuration .xml.
>> >> >
>> >> >
>> >> >
>> >> > Is it possible to set up MapCache to check if the config file was
>> >> > recently
>> >> > updated and, if so, reload the config .xml?  It looks like this is
>> >> > currently
>> >> > enabled under FastCGI, but not under Apache.
>> >> >
>> >> >
>> >> >
>> >> > John
>> >> _______________________________________________
>> >> mapserver-users mailing list
>> >> mapserver-users at lists.osgeo.org
>> >> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>> >
>> >
>
>