Bruce Momjian <bruce@xxxxxxxxxx> writes: > On Wed, May 28, 2014 at 04:56:53PM -0700, Adrian Klaver wrote: >> So for my edification, does that mean -O ' -c >> config_file=/etc/postgresql/9.3/main/postgresql.conf' could cause a >> problem or that starting Postgres outside pg_upgrade could cause a >> problem, or both. > Starting Postgres outside pg_upgrade would _certainly_ cause a problem. It appeared to me that it was failing safely, ie, once somebody had started a conflicting postmaster, pg_upgrade's attempt to start one failed without damage. regards, tom lane