>> Can any one give me more suggestion, about this problem. Every >> time my os got restart, postmaster.pid is missing.
The pid file should only be present when postgres is running. A clean OS shutdown should stop postgres, which should result in the pid file being deleted.
> Did you perhaps use reboot instead of shutdown -r? The former > doesn't do a clean shutdown. That's how it is on *BSD at least, I > don't know about Linux but I assume it behaves the same.
No, `reboot` actually calls `shutdown -r now` in the distros I've used, including Ubuntu; unless you run it with the --force option.
> Check the logs to see if there are any errors when postgres tries > to start up. It could be something as simple as a library version > mismatch, or it could be data corruption in the database files.
Right, checking the log files is the thing to do. Adding or deleting a pid file is just about never the right thing to do.
