[OSRM-talk] Separate Build and Serve instances for OSRM

[Nico Aymet]

Hi,
yes normally I build the graph in my local machine (or any other server if
you want) and upload (overwrite) the .osrm.* files.
After that you can simply restart the osrm-routed process and it starts to
use the new graph.
So you can split it without any problems in two servers.

To reach the hot swap you can move the .osrm.* files from the build server
to the production server with rsync. You can use ssh key access between the
two servers so you can automate it. Obviously if you put the two servers in
the same private network and zone in GCP you can move the files using the
private IP (es. 10.0.0.15) so nothing runs on the "internet wire" and
there's no charge for data transferred in the same availability zone in GCE.

Another option (more expensive) is to use the Google Filestore that is like
a NFS NAS. You can mount a folder on both servers. The build server writes
the new graph and the production one reads it.

Once you have the osrm-routed completely loaded the graph will be loaded in
RAM so you can change the .osrm.* files without problems and after that
restart the osrm-routed.

Let me know if you need other ideas.
Nico Aymet


El vie, 16 jul 2021 a las 9:40, Nikhil VJ (<nikhil.js at gmail.com>) escribió:

> Hi,
> There's a big difference in RAM requirements between building a graph in
> OSRM, and deploying it. I've seen for one country's osm pbf, at build time
> it can easily cross 16GB, whereas when we serve the built-up graph it's
> only occupying a little under 7GB RAM.
>
> If I commission a 32GB RAM server for this, it's a bad waste of 3/4th of
> the resources for something that I would need to do for just, say, half an
> hour in a day, or 1/48th of the time.
> So can we split this?
>
> In GCP (Google Cloud Platform), I want to use a more exotic service like
> dataproc (if you know something better then pls tell) for doing the
> building, and then a VM or a Kubernetes deployment for the server.
> I'm getting stuck at this question : How do I make the data files
> generated by OSRM's build process, available to the server deployment?
> The regular GCP tutorials I see talk about databasing data. Not about
> large gigabyte+ binary files.
>
> Is there a way I can mount one same same storage bucket/folder/drive to
> both?
> Or, is there a way to FTP everything from one place to the other?
>
> Resizing the server's RAM : from 8GB to 32GB and back to 8GB - is
> something I've tried out.. have to switch the whole thing off for quite a
> long time twice and it doesn't look elegant. Ideally I'd want an
> arrangement where the server keeps running, the build action happens
> elsewhere and the graph data gets replaced by latest, and then we quickly
> restart the server. A "hot swap" so to speak.
>
> This all has to meet org security requirements of course. For example:
> it's not an option to make the generated files accessible for download over
> the open internet.
> Does anybody else have knowledge of this kind of setup? What would you
> advise?
>
> --
> Cheers,
> Nikhil VJ
> https://nikhilvj.co.in
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> OSRM-talk at openstreetmap.org
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>
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