I have Redhat 7 installed on a server (total history is: 6.1 upgrade to 6.2 upgrade to 7)

I want to move "everything" to a new computer. How do I migrate everyone without recreating user accounts?

you mean can you move the harddrives to the new system? yes no problem generally, unless you're using a homebuilt kernel and such like. the new hardware should be automatically recongised well enough. there's a chance it won't but it's unlikely really.

Update: I want to transfer all groups and users.

Funny, I migrated my server off of RH 7.0 about half a year ago onto a Slack 8 box. It gets pretty involved if you're running a lot of services and want to keep all of the logs, but lets just worry about the users:

tar czf home.tar.gz /home

Unpack that with:

tar xvzf home.tar.gz

with the file sitting in /

The best way to changover the GIDs and UIDs is to copy /etc/shadow/ /etc/group and /etc/passwd, edit out all of the system daemon IDs, basically everything under 500 in RedHat, and then cat the edited file onto the new machine's /etc/shadow /etc/passwd and /etc/group with:

cat passwd.old >> /etc/passwd

Don't forget to tar up and /var/spool/mail in the same way if you're going to want to swap out the mailserver.

Cheers,

Finegan