So my instance, which I use mainly for web-hosting, became unresponsive to SSH today so I decided to do a soft-reboot from the control panel, however it doesn't appear to be completing.
I've also tried a hard reboot using the openstack command line tools; but my instance seems to still be stuck in either the hard reboot or soft reboot states, and has been for over three hours (with no response to the ticket I posted when I first noticed it was stuck, and live chat is unavailable, very disappointing!).
Obviously I'm still hoping to have the ticket resolved, but for future reference I want to know what my other options are to restore my server, ideally without changing IP and without having to do a lengthy restore from backups.
I'm running an instance with Ubuntu Server 12.04, and was planning to upgrade it tomorrow; I've never had any issues with it until now though, and like I say I only really use it as a web-server so I'm confused as to what could cause such an issue in the first place, as either it's failing to reboot, or is stuck in some kind of reboot cycle, though I can't imagine how the OS could become corrupted to cause that (if that's indeed what has happened), as I'm very careful to minimise what I do as root and use very strict permissions for everything that runs under other users.
I install updates semi-regularly (usually about once a month unless I see a security update that I want to apply sooner), but it's been nearly a month since the last time (like I say, I was going to do an update tomorrow), so it seems unlikely an update caused the issue.