sonarqube dies right after I start it - postgresql

Question

On CentOS-6 box, I am setting up sonarqube-6.4 with postgresql-9.3 Database server running on the same machine. I am using openJDK 8, version below:
$ java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b11)
OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)
I only changed below properties which I think is sufficient to connect sonarqube web with postgre DB:
sonar.jdbc.username=sonar
sonar.jdbc.password=*****
sonar.jdbc.url=jdbc:postgresql://localhost/sonarqube
sonar.web.host=0.0.0.0
sonar.web.port=9100
Now when I start sonar I see following in the sonar.log
--> Wrapper Started as Daemon
Launching a JVM...
Wrapper (Version 3.2.3) http://wrapper.tanukisoftware.org
Copyright 1999-2006 Tanuki Software, Inc. All Rights Reserved.
2017.06.07 01:53:47 INFO app[][o.s.a.AppFileSystem] Cleaning or creating temp directory /opt/sonar/temp
2017.06.07 01:53:47 INFO app[][o.s.a.p.JavaProcessLauncherImpl] Launch process[es]: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.131-0.b11.el6_9.x86_64/jre/bin/java -Djava.awt.headless=true -Xmx1G -Xms256m -Xss256k -Djna.nosys=true -XX:+
UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -Djava.io.tmpdir=/opt/sonar/temp -cp ./lib/common/*:./lib/search/* org.sonar.search.Search
Server /opt/sonar/temp/sq-process5474669563516031830properties
2017.06.07 01:53:53 INFO app[][o.s.a.SchedulerImpl] Process[es] is up
2017.06.07 01:53:53 INFO app[][o.s.a.p.JavaProcessLauncherImpl] Launch process[web]: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.131-0.b11.el6_9.x86_64/jre/bin/java -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Xmx512m -Xms128m -XX:+H
eapDumpOnOutOfMemoryError -Djava.io.tmpdir=/opt/sonar/temp -cp ./lib/common/*:./lib/server/*:/opt/sonar/lib/jdbc/postgresql/postgresql-9.4.1209.jre7.jar org.sonar.server.app.WebServer /opt/sonar/temp/sq-process233758778210871240pro
perties
2017.06.07 01:53:57 INFO app[][o.s.a.SchedulerImpl] Process [web] is stopped
2017.06.07 01:53:57 INFO app[][o.s.a.SchedulerImpl] Process [es] is stopped
2017.06.07 01:53:57 INFO app[][o.s.a.SchedulerImpl] SonarQube is stopped
<-- Wrapper Stopped
Not sure why it dies.
Below is in the web.log:
2017.06.07 04:39:04 INFO web[][o.sonar.db.Database] Create JDBC data source for jdbc:postgresql://localhost/sonarqube
2017.06.07 04:39:04 ERROR web[][o.s.s.p.Platform] Web server startup failed
java.lang.IllegalStateException: Can not connect to database. Please check connectivity and settings (see the properties prefixed by 'sonar.jdbc.').
at org.sonar.db.DefaultDatabase.checkConnection(DefaultDatabase.java:108)
at org.sonar.db.DefaultDatabase.start(DefaultDatabase.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.invokeMethod(ReflectionLifecycleStrategy.java:110)
at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.start(ReflectionLifecycleStrategy.java:89)
at org.sonar.core.platform.ComponentContainer$1.start(ComponentContainer.java:320)
at org.picocontainer.injectors.AbstractInjectionFactory$LifecycleAdapter.start(AbstractInjectionFactory.java:84)
at org.picocontainer.behaviors.AbstractBehavior.start(AbstractBehavior.java:169)
at org.picocontainer.behaviors.Stored$RealComponentLifecycle.start(Stored.java:132)
at org.picocontainer.behaviors.Stored.start(Stored.java:110)
at org.picocontainer.DefaultPicoContainer.potentiallyStartAdapter(DefaultPicoContainer.java:1016)
at org.picocontainer.DefaultPicoContainer.startAdapters(DefaultPicoContainer.java:1009)
at org.picocontainer.DefaultPicoContainer.start(DefaultPicoContainer.java:767)
at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:143)
at org.sonar.server.platform.platformlevel.PlatformLevel.start(PlatformLevel.java:88)
at org.sonar.server.platform.Platform.start(Platform.java:231)
at org.sonar.server.platform.Platform.startLevel1Container(Platform.java:190)
at org.sonar.server.platform.Platform.init(Platform.java:86)
at org.sonar.server.platform.web.PlatformServletContextListener.contextInitialized(PlatformServletContextListener.java:43)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4727)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5189)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (FATAL: no pg_hba.conf entry for host "127.0.0.1", user "sonar", database "sonarqube", SSL off)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at org.sonar.db.profiling.NullConnectionInterceptor.getConnection(NullConnectionInterceptor.java:31)
at org.sonar.db.profiling.ProfiledDataSource.getConnection(ProfiledDataSource.java:323)
at org.sonar.db.DefaultDatabase.checkConnection(DefaultDatabase.java:106)
... 30 common frames omitted
Caused by: org.postgresql.util.PSQLException: FATAL: no pg_hba.conf entry for host "127.0.0.1", user "sonar", database "sonarqube", SSL off
at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:451)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:223)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:211)
at org.postgresql.Driver.makeConnection(Driver.java:407)
at org.postgresql.Driver.connect(Driver.java:275)
at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:1556)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1545)
... 35 common frames omitted
2017.06.07 04:39:06 INFO web[][o.a.c.u.SessionIdGeneratorBase] Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [1,561] milliseconds.
2017.06.07 04:39:06 WARN web[][o.a.c.l.WebappClassLoaderBase] The web application [ROOT] appears to have started a thread named [elasticsearch[Scrier][[timer]]] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Thread.sleep(Native Method)
org.elasticsearch.threadpool.ThreadPool$EstimatedTimeThread.run(ThreadPool.java:747)