aemet-exporter

CLI tool that uploads the last 24h weather conditions from the AEMET OpenData API to influxdb on a hourly basis

Dependencies

• go
• influxdb v2+
• Optional:
  • make - for automatic installation support
  • docker
  • systemd

Relevant documentation

• AEMET OpenData API
• InfluxDB API
• Systemd Timers
• compose-scheduler

Installation

With Docker

docker-compose

1. Configure aemet_exporter.json (see the configuration section below).

2. Run it.

   docker compose up --detach

docker build & run

1. Build the docker image.

   docker build . --tag aemet-exporter

2. Configure aemet_exporter.json (see the configuration section below).

3. Run it.

    docker run --rm --tty --interactive --read-only --cap-drop ALL --security-opt no-new-privileges:true --cpus 2 -m 64m --pids-limit 16 --volume ./aemet_exporter.json:/app/aemet_exporter.json:ro ghcr.io/rare-magma/aemet-exporter:latest

With the Makefile

For convenience, you can install this exporter with the following command or follow the manual process described in the next paragraph.

make build
make install
$EDITOR $HOME/.config/aemet_exporter.json

Manually

1. Build aemet_exporter with:

   go build -ldflags="-s -w" -o aemet_exporter main.go

2. Copy aemet_exporter to $HOME/.local/bin/.

3. Copy aemet_exporter.json to $HOME/.config/, configure it (see the configuration section below) and make it read only.

4. Copy the systemd unit and timer to $HOME/.config/systemd/user/:

   cp aemet-exporter.* $HOME/.config/systemd/user/

5. and run the following command to activate the timer:

   systemctl --user enable --now aemet-exporter.timer

It's possible to trigger the execution by running manually:

systemctl --user start aemet-exporter.service

Config file

The config file has a few options:

{
 "InfluxDBHost": "influxdb.example.com",
 "InfluxDBApiToken": "ZXhhbXBsZXRva2VuZXhhcXdzZGFzZGptcW9kcXdvZGptcXdvZHF3b2RqbXF3ZHFhc2RhCg==",
 "Org": "home",
 "Bucket": "aemet",
 "AemetApiKey": "ZXhhbXBsZXRva2VuZXhhcXdzZGFzZGptcW9kcXdvZGptcXdvZHF3b2RqbXF3ZHFhc2RhCg==",
 "AemetWeatherStationCode": "1234Y"
}

• InfluxDBHost should be the FQDN of the influxdb server.
• Org should be the name of the influxdb organization that contains the data bucket defined below.
• Bucket should be the name of the influxdb bucket that will hold the data.
• InfluxDBApiToken should be the influxdb API token value.
  • This token should have write access to the Bucket defined above.
• AemetApiKey should be the AEMET API key requested in the AEMET OpenData's website
• AemetWeatherStationCode should be the alphanumeric code assigned to the weather station. Can be found in AEMET OpenData's website "Seleccione una estación" dropdown.

Troubleshooting

Check the systemd service logs and timer info with:

journalctl --user --unit aemet-exporter.service
systemctl --user list-timers

Exported metrics for each hour

Weather stations might have a different set of sensors so not all metrics below might be populated.

• temperature: °C
• humidity: %
• pressure: hPa
• windspeed: km/h
• windgust: km/h
• winddirection: °
• precipitation: mm
• dewpoint: °C
• visibility: km
• insolation: hours
• snow: cm

Exported metrics example

aemet_weather_conditions,station=3195 temperature=11.1,humidity=99.0,pressure=949.7,windspeed=0.9,winddirection=271.0,windgust=2.9,precipitation=0.0,dewpoint=11.0,visibility=1.0,insolation=1.0,snow=0.0 1702206000

Example grafana dashboard

In aemet-dashboard.json there is an example of the kind of dashboard that can be built with aemet-exporter data:

Import it by doing the following:

1. Create a dashboard
2. Click the dashboard's settings button on the top right.
3. Go to JSON Model and then paste there the content of the aemet-dashboard.json file.

Uninstallation

With the Makefile

For convenience, you can uninstall this exporter with the following command or follow the process described in the next paragraph.

make uninstall

Manually

Run the following command to deactivate the timer:

systemctl --user disable --now aemet-exporter.timer

Delete the following files:

~/.local/bin/aemet_exporter
~/.config/aemet_exporter.json
~/.config/systemd/user/aemet-exporter.timer
~/.config/systemd/user/aemet-exporter.service

Credits

Información elaborada por la Agencia Estatal de Meteorología © AEMET

• reddec/compose-scheduler