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Geohashing Wiki Down

The geohashing wiki hosted at wiki.xkcd.com/geohashing has been down since September 2019.

More information is available at https://geohashing.info/wiki/.


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All-black maps with staticmaplite (OSM static map generation - Access control configuration prevents your request from being allowed)

I've been using the staticmaplite library for a while to generate static maps based on OSM tiles.

Recently I started getting the following error when downloading tiles:
Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.
The OSM team was very responsive when I contacted them and they pointed me to https://operations.osmfoundation.org/policies/tiles/.

Based on that info, I checked how staticmap.php was fetching tiles and noticed that the User-Agent string was hardcoded to "Mozilla/4.0". I fixed this and now I can fetch tiles again. You can get the updated version from here: https://github.com/crox-net/staticmaplite.

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IPv6 Neighbor discovery

Discover/list other hosts:
ping6 -I eth0 ff02::1
ip -6 neigh show

To connect to a host using the link-local address you need to specify which interface to use (see "zone index"):
ssh -6 fe80::a00:aaaa:bbbb:cccc%eth0
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backuppc "no ping response" when ping works fine

It took me some time to figure this out, maybe it can be useful to someone else...

I kept getting "no ping" error for unknown reasons. It turned out that I had enabled DumpPreUserCmd and UserCmdCheckStatus for that specific host to check for an encrypted partition being mounted.

Due to some changes on the host after an upgrade, the script triggered by DumpPreUserCmd was returning an error... And for some reason this showed as a ping error in the web interface.

I eventually figured it out by checking the last lines of the LOG.** file in the pc/[host] directory, which looked like this:
2018-05-08 19:15:45 Output from DumpPreUserCmd: /[partition] is not mounted
2018-05-08 19:15:45 DumpPreUserCmd returned error status 256... exiting

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Grafana PNG export on headless Debian server (phantomjs / render fails with "404 page not found")

If it still fails after you've set "root_url" to the correct value in grafana.ini, you might want to check whether you can run phantomjs from the command line.

If you get "QXcbConnection: Could not connect to display / PhantomJS has crashed", then the explanation is here: Debian Bug #817277.

To fix it, I installed xvfb (apt-get install xvfb), and edited /usr/bin/phantomjs so that the last line now looks like this:
exec "/usr/bin/xvfb-run" --server-args="-screen 0 640x480x16" "/usr/lib/phantomjs/phantomjs" "$@"

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