I have a CentOS 8 VM with a corrupt filesystem and I want to recover data by rescuing it. I ran openstack server rescue --password somestring myserver. However, when I tried to log in to the VM by providing the somestring password, I can't log in (it says login incorrect). The username I used was centos.
I also tried running the rescue using an Ubuntu image by doing openstack server rescue --image UbuntuImage --password somestring myserver, and I can't log in through that either with username ubuntu and password somestring. How do I log in to the VM during the rescue process?
The safest option is to use a special rescue image like SystemRescueCd[1] or Finnix[2] which does not prompt for password, I believe you can also use Ubuntu Server or CentOS install ISO since it can act as a rescue livemedia.
It could be that the images you are using are locked down and can only be accessible via ssh-keys, during the rescue mode the original disk will be attached a 2nd disk, and new image is started instead of the old disk, so you should try to ssh to it via the key.
[1] https://www.system-rescue.org/ [2] https://www.finnix.org/