PostgreSQL connection failure with SonarQube 8.5

Question

I've installed SonarQube 8.5 over a CentOS 7 system and it started before I set up a PostgreSQL 9.6 connection (with embedded database, then). So I moved on:

sonar.jdbc.username=sonar
sonar.jdbc.password=####
...
sonar.jdbc.url=jdbc:postgresql://localhost/sonar

This is what I've got in my /var/lib/pgsql/data/pg_hba.conf

# TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD
# "local" is for Unix domain socket connections only
local   all         all                               md5
# IPv4 local connections:
host    all         all         127.0.0.1/32          md5
# IPv6 local connections:
host    all         all         ::1/128               md5

Since I added the database (named "sonar") connection, it failed with no helpful logs. Only those:

2020.11.06 13:47:16 WARN es[][oedcsSettings] [http.enabled] setting was deprecated in Elasticsearch and will be removed in a future release! See the breaking changes documentation for the next major version.

2020.11.06 13:47:25 WARN app[][osapAbstractManagedProcess] Process exited with exit value [es]: 143

2020.11.06 13:47:24 WARN web[][oaclWebappClassLoaderBase] The web application [ROOT] appears to have started a thread named [elasticsearch[ client ][[timer]]] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:\\n java.base@11.0.8/java.lang.Thread.sleep(Native Method)\\n app//org.elasticsearch.threadpool.ThreadPool$CachedTimeThread.run(ThreadPool.java:574)

So I tried to fix and test the database account here:

ALTER USER sonar WITH ENCRYPTED PASSWORD '####';
ALTER ROLE
...
psql -d "postgresql://sonar:####@localhost/sonar" -c "select now()"
psql: FATAL:  Ident authentication failed for user "sonar"

NB: I've been trying it with AND without encryption, as ROOT user and POSTGRES user... but no luck.

Answer 1

See comments above for configuration fix. In the first place, the default PG version from yum in Centos OS 7 wasn't even right.