I know that it may sound stupid but I forgot the encryption LUKS password(after a year of no-activity on that specific server) so I was wondering if there is any way to disable or reset this password. The OS is running as virtual machine on on VMWARE host and I'm asked to insert the LUKS password when I start/power-up the server. thank you in advance for any help !
I.e. You're probably out of luck, unless you can remember your password.
If you do wish to go crazy and try to break the encryption.... http://questions.securitytube.net/questions/948/production-issue-i-forgot-my-luks-passphrase-how-can-i-bruteforce-it-or-crack-t
But even then chances are slim you could do it in a reasonable amount of time.