[Tile-serving] [mod_tile] "Failed to read cmd on fd" errors since mod_tile update on 2nd June (#77)

[Andy Townsend]

On 18/01/2016 09:04, avirupd-egnaroinc wrote:
>
> I have followed this tutorial 
> https://switch2osm.org/serving-tiles/manually-building-a-tile-server-14-04/
> But I am getting this when I am running
> sudo -u egnaro renderd -f -c /usr/local/etc/renderd.conf
>
> renderd[22238]: Rendering daemon started
>

(rest of renderd log snipped)

Are you getting any errors in the renderd log?  I can see lots of debug 
messages in 
https://github.com/openstreetmap/mod_tile/issues/77#issuecomment-172468740 
, but no errors, and no START TILE or DONE TILE debug messages. Also, do 
any tiles get created?

What I tend to do to watch the tile rending process is:
sudo tail -f /var/log/syslog | grep "TILE "

So I then see things like:
Jan 18 13:50:58 servername renderd[1220]: DEBUG: START TILE ajt 15 
16208-16215 10672-10679, new metatile
Jan 18 13:51:13 servername renderd[1220]: DEBUG: DONE TILE ajt 15 
16208-16215 10672-10679 in 14.344 seconds

Obviously looking at the full log makes sense while you're still trying 
to figure out what's wrong, but you may need to read through a lot of 
log to get to the "interesting" bits.

Cheers,

Andy