Caused by: org.postgresql.util.PSQLException: FATAL: no pg_hba.conf entry for host "127.0.0.1", user "ambari", database "ambari", SSL off
at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:291)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:108)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66)

启动ambari-server时遇到以上问题：

#vi /var/lib/pgsql/data/pg_hba.conf

增加内容

# IPv4 local connections:
host    all             all             127.0.0.1/32            md5

添加成功后，重新启动postgresql数据库

#/etc/init.d/postgresql restart

最后，启动ambari-server