I had one of my dedicated servers crash the other day and when I fixed it and booted it again, some of my virtual machines didn't boot.
Turns out, it's because they didn't have the autostart enabled:
root@s3:~ # virsh dominfo m Id: - Name: m UUID: f2f9b5aa-7086-89ef-a643-fddb55134ef0 OS Type: hvm State: shut off CPU(s): 4 Max memory: 4194304 KiB Used memory: 4194304 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0
That's how one can turn the autostart on so that next reboot this VM would start (last parameter is the name of the VM):
root@s3:~ # virsh autostart m Domain m marked as autostarted
And just to make sure this actually helped:
root@s3:~ # virsh dominfo m Id: - Name: m UUID: f2f9b5aa-7086-89ef-a643-fddb55134ef0 OS Type: hvm State: shut off CPU(s): 4 Max memory: 4194304 KiB Used memory: 4194304 KiB Persistent: yes Autostart: enable Managed save: no Security model: none Security DOI: 0
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