1

I have built a tile server by following this instruction: https://switch2osm.org/serving-tiles/building-a-tile-server-from-packages/ and i have a problem. When i test tile server using http://localhost/osm/slippymap.html, some tiles are pink. After zoom out and zoom in tiles are usually properly displayed. I tried to run renderd in debugging mode. This is the sample output:


renderd[19572]: DEBUG: Got incoming request with protocol version 2
renderd[19572]: DEBUG: Got command RenderPrio fd(12) xml(default), z(11), x(1156), y(691), mime(image/png), options()
renderd[19572]: DEBUG: Got incoming connection, fd 13, number 6
renderd[19572]: DEBUG: Got incoming request with protocol version 2
renderd[19572]: DEBUG: Got command RenderPrio fd(13) xml(default), z(11), x(1158), y(691), mime(image/png), options()
renderd[19572]: DEBUG: DONE TILE default 11 1160-1167 688-695 in 6.073 seconds
debug: Creating and writing a metatile to /var/lib/mod_tile/default/11/0/0/66/139/128.meta

renderd[19572]: DEBUG: Sending render cmd(3 default 11/1160/689) with protocol version 2 to fd 8
renderd[19572]: DEBUG: Sending render cmd(3 default 11/1160/690) with protocol version 2 to fd 10
renderd[19572]: DEBUG: Sending render cmd(3 default 11/1160/688) with protocol version 2 to fd 9
renderd[19572]: DEBUG: Failed to read cmd on fd 8
renderd[19572]: DEBUG: Connection 0, fd 8 closed, now 5 left
renderd[19572]: DEBUG: Failed to read cmd on fd 10
renderd[19572]: DEBUG: Connection 1, fd 10 closed, now 4 left
renderd[19572]: DEBUG: Failed to read cmd on fd 9
renderd[19572]: DEBUG: Connection 0, fd 9 closed, now 3 left
renderd[19572]: DEBUG: Got incoming connection, fd 8, number 4
renderd[19572]: DEBUG: Got incoming request with protocol version 2
renderd[19572]: DEBUG: Got command RenderPrio fd(8) xml(default), z(11), x(1155), y(691), mime(image/png), options()
renderd[19572]: DEBUG: Got incoming connection, fd 9, number 5
renderd[19572]: DEBUG: Got incoming request with protocol version 2
renderd[19572]: DEBUG: Got command RenderPrio fd(9) xml(default), z(11), x(1159), y(691), mime(image/png), options()
renderd[19572]: DEBUG: Got incoming connection, fd 10, number 6
renderd[19572]: DEBUG: Got incoming request with protocol version 2
renderd[19572]: DEBUG: Got command RenderPrio fd(10) xml(default), z(11), x(1154), y(691), mime(image/png), options()
renderd[19572]: DEBUG: Failed to read cmd on fd 11
renderd[19572]: DEBUG: Connection 0, fd 11 closed, now 5 left
renderd[19572]: DEBUG: Failed to read cmd on fd 12
renderd[19572]: DEBUG: Connection 0, fd 12 closed, now 4 left
renderd[19572]: DEBUG: Failed to read cmd on fd 13
renderd[19572]: DEBUG: Connection 0, fd 13 closed, now 3 left
renderd[19572]: DEBUG: Failed to read cmd on fd 8
renderd[19572]: DEBUG: Connection 0, fd 8 closed, now 2 left
renderd[19572]: DEBUG: Failed to read cmd on fd 9
renderd[19572]: DEBUG: Connection 0, fd 9 closed, now 1 left

I've also tried to pre-render tiles for region. Command for pre-rendering is for example:


render_list -all -s /var/run/renderd/renderd.sock -x 34 -X 36 -y 20 -Y 21 -z 6 -Z 6

Pre-rendering process displays messages pasted below and i don't know if it is working still or not:


debug: init_storage_backend: initialising file storage backend at: /var/lib/mod_tile
Rendering client
Starting 1 rendering threads
Rendering all tiles from zoom 6 to zoom 6
Rendering all tiles for zoom 6 from (34, 20) to (36, 21)
Waiting for rendering threads to finish

I can't see new tiles in /var/lib/mod_tile after that process.

Why does it happen (pink tiles)? How can I prevent this?

Improve this question
4
  • Is your rendering server poor performance (e.g. a VM? or a laptop with slow disk/?)
    – BradHards
    Commented Sep 26, 2015 at 6:18
  • It's a virtual server residing on physical server.
    – Anad
    Commented Sep 28, 2015 at 12:37
  • That doesn't really say much. What sort of virtualisation? What virtual characteristics? How much load is the host on?
    – BradHards
    Commented Sep 28, 2015 at 20:58
  • Virtualisation is made using VMWare. Server has 2 virtual CPUs. Turning RAM up (from 4GB to 8GB and to 16 GB) doesn't take effect. Data covers country extract (not whole planet). Disk usage is about 50%. Physical server is not loaded too much. The 'top' command sometimes shows (during map repainting) that CPU "wa" value grow from 0% to about 50%. Pink tiles usually appear after that. I don't know if it is any clue.
    – Anad
    Commented Sep 30, 2015 at 11:35

1 Answer 1

Reset to default
1

Ok. It was a silly mistake with render_list (literal error)... It should be "--all" or "-a", not "-all". This option was not recognized (with no error message). The command was waiting for x y and z parameters from stdin. Using render_list in proper way solved my problem. Pink tiles don't appear after that.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.