Maps are not rendered: openstreetmap net::ERR_NAME_NOT_RESOLVED

[EvgeniiaVak]

Steps to reproduce

1. Using frontend-v2 latest version: datopian/frontend-v2@e9df25e
2. Using Data Explorer latest version: 96dc7b3
3. Using ODDK theme version from fix branch: datopian/frontend-oddk@1a09136
   (Just started to use data-explorer instead of datapackage-views-js, styles not configured yet)

The page loads the maps and the dots are there on the map, but the map itself is not there:

And there is an exception in the browser logs:

b.tile.openstreetmap.org/11/1080/634.png:1 Failed to load resource: net::ERR_NAME_NOT_RESOLVED

[EvgeniiaVak]

Browsing through different openstreetmap resources I found that they work from TorBrowser but do not work in Google Chrome, e.g. for me https://b.tile.openstreetmap.org/11/1080/634.png works ok in Tor, but returns b.tile.openstreetmap.org’s server IP address could not be found. in other browsers. Might be an issue with local Russian opestreetmap servers (found this article: https://blog.openstreetmap.org/2012/10/24/new-tile-server-in-moscow/).

Another example the openstreetmap dns site (found in this repo - https://github.com/openstreetmap/dns): https://dns.openstreetmap.org/tile.openstreetmap.org.html

Here how it looks like in Chrome:

and there is the same net::ERR_NAME_NOT_RESOLVED error in the browser console log -
dns.openstreetmap.org-1584710572873.log

And here how it looks like in Tor:

I have 3 hypotheses:

• Something's wrong with DNS - (using google ones, but who knows maybe that's not enough)
• The resource is blocked in Russia
• The Moscow openstreetmap server is not working properly

[EvgeniiaVak]

The resource is not officially blocked in Russia: https://eais.rkn.gov.ru/ did not find anything on tile.openstreetmap.org.

[EvgeniiaVak]

Tried to load the https://dns.openstreetmap.org/tile.openstreetmap.org.html from phone (not WIFI but cellular network - another Internet Provider) - same thing, not working:

[EvgeniiaVak]

openstreetmap servers are not always up: https://uptime.openstreetmap.org/

[EvgeniiaVak]

Interestingly if to use an iframe which uses ckan's view extention, the openstreetmap works:

<iframe width="700" height="400" src="https://admin.opendata.dk/dataset/bymiljo-aarhus-cityprobe/resource/2b503ea0-caec-4966-a293-7c2a56e6f5ce/view/42dec9c5-2b34-46ce-af1d-effd287cbc90" frameBorder="0"></iframe> 

iframe on top, data explorer below:

The classic ckan approach also uses opensteetmaps.org with Leaflet but the difference is it's deployed in another country that has the access currently => If we are moving from the server (ckan classic approach) to the browser (which Data Explorer (or datapackage-views-js to be precise) does) some clients might not see the maps (currently it's happening in Russia and Georgia).

Although ckan uses a slightly different map tiles URL settings:

https://stamen-tiles-{s}.a.ssl.fastly.net/terrain/{z}/{x}/{y}.png

which works for me too, e.g. this link https://stamen-tiles-b.a.ssl.fastly.net/terrain/11/1080/634.png shows the map:

Although the openstreetmap.org also just started working, so maybe no difference here.

[EvgeniiaVak]

Possible solutions

1. find ways to contribute to Open Street Maps project (make the GeoDNS route to a sertain server only when it's up) - a lot of unknowns here
2. switch to a more stable service, e.g. google maps (it has freemium but is not of course as free as the Open Street Maps)
3. host our own (Datopian) Open Street Maps server (I would vote for this one) - e.g. here is an example of how to do the set up with docker https://switch2osm.org/serving-tiles/using-a-docker-container/.
   Although it's a lot of data. From the wiki:

Planet.osm is the OpenStreetMap data in one file: all the nodes, ways and relations that make up our map. A new version is released every week. It's a big file (on 2020-03-01, the plain OSM XML variant takes over 1192.4 GB when uncompressed from the 86.0 GB bzip2-compressed or 49.4 GB PBF-compressed downloaded data file).

4. try to find a more stable free to use server

@zelima what do you think? do we have the capacity to serve our own Open Street Maps server?