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fix: various small
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moanos [he/him] 2024-09-28 12:16:35 +02:00
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content/post/deploying-django-with-docker-and-ansible.md
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@ -3,6 +3,7 @@ title: "Deploying a django app with docker, ansible and traefik"
date: 2023-07-24T22:10:10+02:00
draft: false
image: "uploads/docker-ansible-django-traefik/django_docker_ansible_traefik.png"
image_alt: "Graphic showing the Django, Docker, Ansible and Traefik logo"
categrories: ['English']
tags: ['MASH', 'django', 'ilmo', 'ansible', 'traefik', 'docker']
---

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content/post/django-geocoding/index.md
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@ -11,13 +11,13 @@ tags: ['django', 'geocoding', 'nominatim', 'OpenStreetMap', 'osm', 'traefik', 'm
Geocoding is the process of translating a text input like `Ungewitterweg, Berlin` into a location with longitude and latitude such as `52.544022/13.147589`. So whenever you search in OpenStreetMap or Google Maps for a location, it does exactly that (and sometimes more, but we don't focus on that now).
For a pet project of mine ([notfellchen.org](https://notfellchen.org)) I wanted to do exactly that: When a animal is added there to be adopted, the user must input a location. That is geocoded and saved. When another user visits the site, that wants to adopt a pet in their area, they input their location and it will search for all animals in a specific radius.
For a pet project of mine ([notfellchen.org](https://notfellchen.org)) I wanted to do exactly that: When a animal is added there to be adopted, the user must input a location that is geocoded and saved with it's coordinates. When another user visits the site, that wants to adopt a pet in their area, they input their location and it will search for all animals in a specific radius.
So lets get started!
How is that done? I'll show you!
# Nominatim
Nominatim is a software that uses OpenStreetMap data for geocoding. It can also do the reverse, find an address for any location on the planet. It is used for the geocoding on [OpenStreetMap](https://openstreetmap.org), so quite production-ready. We could use the public API (while obeying the [usage policy](https://operations.osmfoundation.org/policies/nominatim/)) but it's nicer to have our own instance, so we don't stress the resources of a donation funded organization and to improve user privacy.
Nominatim is a software that uses OpenStreetMap data for geocoding. It can also do the reverse, find an address for any location on the planet. It is used for the geocoding on [OpenStreetMap](https://openstreetmap.org), so it's quite production-ready. We could use the public API (while obeying the [usage policy](https://operations.osmfoundation.org/policies/nominatim/)) but it's nicer to have our own instance, so we don't stress the resources of a donation funded organization and to improve user privacy.
Nominatim works by importing geodate from a [PBF](https://wiki.openstreetmap.org/wiki/PBF_Format)-file into a postgres database. This database will later be queried to provide location data. The process is described below.
@ -36,7 +36,8 @@ It bundles nominatim together with the database postgres. I usually prefere to h
* import process (described later) will not slow the database for other services
* it's easier to nuke everything if things go wrong
The following environment variables will be used
The following environment variables will be used to configure the container
* `PBF_URL`: The URL from where to download the PBF file that contains the geodate we will import. They can be obtained from [Geofabrik](https://download.geofabrik.de/). It is highly recommended to first download the file to a local server and then set this URL to that server so that the ressources from Geofabrik are not affected if something goes wrong. Feel free to use the pre-set URL for germany while it works if you want to test around.
* `REPLICATION_URL`: Where to get updates from. For example Geofabrik's update for the Europe extract are available at `https://download.geofabrik.de/europe-updates/` Other places at Geofabrik follow the pattern `https://download.geofabrik.de/$CONTINENT/$COUNTRY-updates/`
* `POSTGRES_` Postgres tuning data, the current setting allows imports on a ressource constrained system. See [postgres tuning docs](https://github.com/mediagis/nominatim-docker/tree/master/4.4#postgresql-tuning) for more info
@ -125,10 +126,11 @@ Now we are ready to go! Before you type `docker-compose up -d` let me explain wh
3. Import the PBF file into the database. Here you are most likely to run into errors because of ressource constraints
4. Start the Nominatim server
If you are ready, lets go: `docker-compose up -d`. Monitor what nominatim is doing with `docker logs -f nominatim` and make a cup of tea. This might take a while.
If you are ready, lets go: `docker-compose up -d`. Monitor what nominatim is doing with `docker logs -f nominatim` and make a cup of tea. This will take a while (proably several hours).
## Testing
You can try your server by visiting the domain. Use `/?q=CITYNAME` to see an actual search result.
You can test your server by visiting the domain. Try `/?q=CITYNAME` to see an actual search result.
Example: `https://geocoding.example.org/?q=tuebingen`