2014-05-16 11:56 GMT-03:00 Graeme Gemmill <graeme@xxxxxxxxxxxx>: > $ ./pg_ctl start -D /mnt/post/pgsql/data & > [1] 3692 > [postgres@localhost bin]$ pg_ctl: could not open PID file > "/mnt/post/pgsql/data/postmaster.pid": Protocol error > > [1]+ Exit 1 ./pg_ctl start -D /mnt/post/pgsql/data > Is there any advice on running postgresql in a virtual machine connecting to > host data? Did you check your logs to see if there was any information which would point to the problem? Looks like a libpq - backend server mismatch. -- Martín Marqués http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services