OK, Reply to myself… After investigating through the forum, I’ve seen this post and now for those who encountered the same problem, beware, the script installing InfluxDB and Grafana doesn’t do all the job. DATABASE is not installed!
In my case, after a clean install, I had to proceed this way:
sudo chown -hR openhab:openhab /etc/openhab2
sudo chown openhab:openhabian /etc/openhab2/services/influxdb.cfg
influx -port 8086 -username myusername -password mypassword -host localhost
CREATE DATABASE openhab_db
CREATE USER myusername WITH PASSWORD 'mypassword' WITH ALL PRIVILEGES
CREATE USER openhab WITH PASSWORD 'myopenhabpassword'
CREATE USER grafana WITH PASSWORD 'mygrafanapassword'
GRANT ALL ON openhab_db TO openhab
GRANT READ ON openhab_db TO grafana
@ThomDietrich I know it’s hard to maintain documentation, and I appreciate what has been done but it would be easy to copy these lines at the beginning of the topic, it would help Beginners like me. 