[QGIS-Developer] QGIS server deployment

Walter Lorenzetti lorenzetti at gis3w.it
Mon Mar 4 06:10:19 PST 2019


Hi Eric,

thank oyu very much for this reply, I found your post clear and usefull.

All the best.

W

Il 26/02/19 16:33, Eric Lemoine ha scritto:
>> Hi all,
>>
>> I'm not a sysadmin but for our customers I'd like find the better way
>> for deploy QGIS-server 3.
>>
>> I try at least 3 ways:
>>
>> 1) Apache2 + libapache2-mod-fcgid
>
> There is Apache2 + mod_proxy_fcgi that you could use as well. As
> opposed to mod_fcgid, mod_proxy_fcgi requires that you use your own
> method for starting the FastCGI process(es) (QGIS Server here). In this
> regard mod_proxy_fcgi is very similar to NGINX-based setups.
>
>
>> 2) Nginx + fcgiwrap
> I recently added a note to the QGIS Server docs [0] that recommends
> against fcgiwrap. fcgiwrap is very slow, because it creates a new QGIS
> Server process on each request!
>
> [0]
> <https://docs.qgis.org/testing/en/docs/user_manual/working_with_ogc/server/getting_started.html#nginx>
>
>> 3) Nginx + QGIS-Server working by socket/service (systemd)
>
> I like this one a lot, because it doesn't require anything else than
> systemd, which has become very very common on Linux distros. I even
> wrote a blog post about it :-) See [1].
>
> [1]
> <https://oslandia.com/en/2018/11/23/deploying-qgis-server-with-systemd/>
>
>
>> By delveloper side, what do you think is the best?
>
> As already said I like the systemd-only method because it doesn't
> require more than systemd, which you probably already have and use on
> your Linux system.
>
> spawn-fcgi works great as well, but you will need to use something like
> supervisord, or write a systemd system unit for it.
>
>
>> I'd like to much 3) solution, but I found some problems, in
>> particular, how many sockects I've to create watching at my server?
>> (Number of processors )
>
> I'd recommend using one QGIS Server process per processor, or even a
> few more for more parallelism during I/O operations. For example with 4
> processors I think you can use 6-8 QGIS Server processes.
>
>
>> For 1) and 2) have you experiences on performance and tuning?
> Don't use 2 :-) I don't have much experience with 1 so I won't comment.
> But Patrick's suggestions sound very good to me :)
>
> One final note: at Oslandia we either use NGINX + systemd, or NGINX +
> spawn-fcgi when running QGIS Server in Docker container. If you want
> to use Docker I'd recommend taking a look at [2], which explains how we
> build and run QGIS Server using Docker.
>
> [2] <https://github.com/Oslandia/docker-qgis>
>
> Good luck!
>
-- 

Walter Lorenzetti phD
email: lorenzetti at gis3w.it
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