Hi, su -l postgres -s /bin/sh -c id output: uid=0(root) gid=26 euid=26(postgres) groups=26 su -l postgres -s /bin/sh -c "/usr/bin/postmaster -D $PGDATA" output /usr/bin/postmaster: real and effective user ids must match I am running Redhat 8, it is same way to start the postgres "/etc/rc.d/init.d/postgresql start", >When was the last time you successfully started the postmaster the >same way you're trying now? How long had you been running PostgreSQL >without any problems? If it used to work then something has changed. I am running Redhat 8, it is same way to start the postgres "/etc/rc.d/init.d/postgresql start", I running postgre about 2 years ago, maybe it is the hacker do it, because before I found one unknown user and delect it, and then I restart the service with error. David
