Project TTN Daten in InfluxDB für Grafana

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Flexible Visualization of TTN Data

This page describes installing Grafana and InfluxDB on openSuse 42.2. It also describes how to configure apache 2.4 to recieve data from a Things Network applications HTTP integration and store it in an InfluxDB database. Finally it shows how to create a Grafana dashboard to display the data from the InfluxDB.

InfluxDB

Installing InfluxDB

Here is the Download Portal Currently, it tells me to 

wget https://dl.influxdata.com/influxdb/releases/influxdb-1.7.9.x86_64.rpm
sudo zypper install influxdb-1.7.9.x86_64.rpm

It warns about missing package shadow-util. On openSuse this is named shadow and is installed -> ignore.

To use systemd for managing the database service, copy the service file 

sudo cp -av /usr/lib/influxdb/scripts/influxdb.service /etc/systemd/system/

For later versions of openSuse, Influx Installation Documentation suggests using a repository - should have the same results: 

sudo zypper ar -f obs://devel:languages:go/ go
sudo zypper in influxdb

Configure InfluxDB

I did not need to change anything here, but in case you want to check: 

sudo vi /etc/influxdb/influxdb.conf

Start InfluxDB

sudo systemctl daemon-reload
sudo systemctl enable influxdb
sudo systemctl start influxdb
sudo systemctl status influxdb

Test InfluxDB

Call the CLI and insert some test data. More details here: https://docs.influxdata.com/influxdb/v1.7/tools/shell/ 

influx
 CREATE DATABASE my_test_db
 USE my_test_db
 INSERT my_table,my_key=my_test my_value=1
 INSERT my_table,my_key=my_test my_value=2
 INSERT my_table,my_key=my_test my_value=3
 SELECT * FROM my_table
 QUIT

Grafana

Install Grafana

Here are the installation instructions. Basically just do 

wget https://dl.grafana.com/oss/release/grafana-6.5.2-1.x86_64.rpm 
sudo zypper install grafana-6.5.2-1.x86_64.rpm

It complains about missing urw-fonts, but they are not really required -> ignore. Also accept there is no signing key

Start Grafana

sudo systemctl daemon-reload 
sudo systemctl enable grafana-server.service 
sudo systemctl start grafana-server.service 
sudo systemctl status grafana-server.service

Test Grafana

Open http://localhost:3000

Login as user admin and password admin. You will be asked for a new password immediately. Go to the steps in the web UI:

  • Add datasource
    • Select InfluxDB
    • Check use as default
    • Enter URL of your InfluxDB, e.g. http://localhost:8086
    • Enter our test db in InfluxDB Details: my_test_db
    • Select Save & Test should respond with success
  • Add dashboard
    • Go back to the first page via the Grafana symbol in the upper left and select New dashboard
    • Select Add query
    • Select measurement: my_table
    • Select field: my_value
    • optionally enter an alias: my_count
    • Select next icon: Visualization
    • Select Null values: connected (to draw lines between dots)
    • Select Legend: Min and Max (to display them below the dashboard)
    • Select next icon: General
    • Enter a panel title
    • We could add more panels, but for now: select Save dashboard icon and give it a name: My counts
    • Select the region around the dot, repeat the zoom until you see the single values.
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