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I just inherited a server from another admin (appserver1). The ability to ssh as root has been disabled, and the only person who had sudo access to root forgot his password (I can log on as the oracle user).
I tried running sudo as oracle but it fails b/c oracle is not in the sudoers file, and I can't su to the old admin's id b/c the permissions on the su binary has been modified.
My question is, is there a way to reset the old admin's password without having to go into run level 1 and gaining root access that way? I'm just curious.
You can't necessarily get in by using run level 1---depends how the system is set up.
I only know two ways---both involving booting from a live CD.
1. mount the hard drive and then use chroot to "get inside". Then change the root password normally
2. mount the hard drive and edit /etc/passwd to remove the first "x"---you can then reboot and login as root without a password