"Jan-Peter Seifert" <Jan-Peter(dot)Seifert(at)gmx(dot)de> writes:
> I wonder what this variable in initdb is about: POSTGRES_SUPERUSERNAME
> Apparently the default should be 'postgres'. However, the value changes with the user that is logged in whenever I use 'initdb --show'. If I login as 'xy' the value is 'xy'. Shouldn't this be a fixed value in the cluster?
No, that's exactly the expected behavior. The username of the user who
runs initdb is used.
regards, tom lane