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How to Put an Instance in Rescue Mode

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Stephanie Richards
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Learn how to put your OVHcloud Public Cloud instance in rescue mode and access your data.

Your Public Cloud instance may become inaccessible due to a lost SSH key or configuration errors. In such circumstances, you can use the rescue mode to reconfigure your instance or to recover your data.

Requirements

Instructions

Step 1: Activating rescue mode

From the OVHcloud Control Panel:

  1. Click Public Cloud from the top navigation bar.
  2. Select Instances from the left-hand menu.
  3. Select the more options ... button to the right of your instance.
  4. Select Reboot in rescue mode.  

instance_rescuemode01.png

You will now see the Reboot in rescue mode dialog box. Click the drop-down list to select the distribution you would like to use in rescue mode and then click the Restart button.

instance_rescuemode02.png

Once your instance has been rebooted in rescue mode, an information box will display the options to access it. Your temporary rescue mode password will only be shown in the VNC console. Click on your instance in the table, then switch to the tab VNC console to retrieve it.

instance_rescuemode03.png

instance_rescuemode04.png

 

Step 2: Accessing your data

When rescue mode has been activated, your instance's data will be attached as an additional disk. You will now need to mount it, by taking the following steps.

First, establish an SSH connection to your instance. Once you are connected, verify the available disks with this command:

root@instance:/home/admin# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda 253:0 0 1G 0 disk
└─vda1 253:1 0 1023M 0 part /
vdb 253:16 0 10G 0 disk
└─vdb1 253:17 0 10G 0 part

Next, mount the partition:

root@instance:/home/admin# mount /dev/vdb1 /mnt

Your data will now be accessible from the /mnt folder.

 

Step 3: Deactivating rescue mode

Once you have completed your tasks, you can deactivate rescue mode by rebooting your instance from the Control Panel interface. To execute this, click the more options ... button and select Exit rescue mode.

instance_rescuemode05.png

NOTE: If the Exit rescue mode button is not displayed while the instance is in rescue mode, we recommend that you refresh your tab.

 

Activating rescue mode using the OpenStack API

You can also activate rescue mode via the OpenStack API using the following command:

root@instance:~# nova rescue INSTANCE_ID

To exit rescue mode, use the following command:

root@instance:~# nova unrescue INSTANCE_ID

 

Go further

For more information and tutorials, please see our other Public Cloud support guides or explore the guides for other OVHcloud products and services.

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