Sorry, I gave up after almost three hours of trying..
I've installed Confluence 5.3 on CentOS 6.4 server by downloading and launching .bin file.
I've installed PostgreSQL 9.0.14.
Now I'm trying to finish Confluence installation. I use this doc: https://confluence.atlassian.com/display/DOC/Database+Setup+for+PostgreSQL
When I specify login and password and try to connect to the database I get this error: "org.postgresql.util.PSQLException: FATAL: Ident authentication failed for user "confluence". I'm stuck here and dispite all my attempts to solve this I always get this error. Now I want to switch to MySQL, because this DB is more familiar to me, but after so much time spent trying to find the solution I decided to ask the community first.
Any suggestions are appreciated.