how do I start postgresql server automatically when boot?
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I'm wondering how I start it automatically when I boot up the ubuntu 10.04? especially, when I created the user "postgres", I set a password to it. every time I issued "su - postgres" command, I need to give it a password.
Is there a reason you built it yourself? You should normally just run "sudo aptitude install postgresql" and it'll be installed for you completely, including the additional scripts to start on boot. This should be your principle concern, installing this way instead.
From source though there may well be a startup script in the source directories to do all this, but you can just run these commands directly if need be. you wouldn't need to enter a password if these are added to /etc/rc.local as it'd run as root, not as your normal user account. but you can't run these commands in a script though, as when you run the su command it will fork into a new shell.
if you ran "su - postgres /usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data >logfile 2>&1 &" then that should start it and continue on, but again you should really use a proper service script, especially for a service as large as a database.