After rebooting the Container Jira is running in due to a scheduled reboot of the underlying server the web interface shows me the following error:
Database: JIRA couldn't connect to your database
The database I am using is postgres 11.7 running on a containerised ubuntu 19.10, which is the same container jira is running on. I'm using the Jira Self Hosted Starter Package. (Not the Cloud Product which it says on the right side of this page)
I did took a look at the open ports with netstat and the port is up and the database is running well (according to systemctl). I also connected to the database with pgAdmin4 and did have no problems connecting.
Also I did not find any errors in the atlassian-jira.log file which I just tried to add a redacted version if which is still not possible to to the char limit.