Reinstall and upgrade

#Reinstall the OS

Reinstalling rebuilds the system disk from an image. Data disks are not touched.

1. Open the instance, then More actions → Reinstall OS (or Settings → Reinstall OS).
2. Choose the Image.
3. Password: type a new one or click Random. Leave it empty to keep the current password.
4. Linux: tick Replace SSH keys to bind different keys, or leave it to Keep current keys.
5. Click Reinstall and confirm.

After the reinstall:

• Remove the old host key on your computer: ssh-keygen -R <instance-ip>.
• Mount data disks again and redo settings made inside the OS (extra IPs, firewall).

#Upgrade

The Upgrade tab changes resources. Prices are shown before you pay.

• Choose a spec: move to a larger plan, or Downgrade. A downgrade is not refunded and applies from the next billing period.
• Expand capacity: grow a disk. Disks can't be shrunk after expansion; the partition inside the OS is extended on restart.
• Add data disk and Extra IPv4: add resources to the instance.

Some changes take effect after a restart; the page then shows a Restart prompt.

#Troubleshooting

• The action is disabled: another task is running, or the instance is not in a state that allows it. Wait and try again.
• Can't log in after a reinstall: open Remote connection → VNC to check that the first boot has finished.