Having issues with postgresql, what should I log?
could not translate host name "localhost" to address


Implies a failure in your DNS resolver. You can see the error generated in libpq's fe-connect.c :1661. There is a call to pg_getaddrinfo_all which is a wrapper for getaddrinfo which is provided by glibc.

See man getaddrinfo.

Does your local /etc/hosts file have an entry for localhost, or are you relying on a remote DNS server to resolve localhost to 127.0.0.1? What are you providing in PGConn to connectDBStart?