openstack/openstack-manuals
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c4f952e171
openstack-manuals/doc/user-guide/source/cli_reboot_an_instance.rst
Andreas Jaeger 28d95bfc66 End User Guide: Remove user_only and orphan 
With the split of the User Guides, there's no need anymore to have
orphan and user_only flags, remove them from the user-guide
directory.

Only files that keep :orphan: are
doc/user-guide/source/hot-guide/hot_advanced_topics.rst and
hot_existing_templates.rst since these files are not currently included.

Change-Id: I1ac0356d69d8668785f8b1947e8b061731aca747
2015-05-13 18:09:16 +00:00

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Reboot an instance

You can soft or hard reboot a running instance. A soft reboot attempts a graceful shut down and restart of the instance. A hard reboot power cycles the instance.

By default, when you reboot an instance, it is a soft reboot.

$ nova reboot SERVER

To perform a hard reboot, pass the --hard parameter, as follows:

$ nova reboot --hard SERVER

It is also possible to reboot a running instance into rescue mode. For example, this operation may be required, if a filesystem of an instance becomes corrupted with prolonged use.

Note

Pause, suspend, and stop operations are not allowed when an instance is running in rescue mode, as triggering these actions causes the loss of the original instance state, and makes it impossible to unrescue the instance.

Rescue mode provides a mechanism for access, even if an image renders the instance inaccessible. By default, it starts an instance from the initial image attaching the current boot disk as a secondary one.

To perform an instance reboot into rescue mode, run the following command:

$ nova rescue SERVER

To restart the instance from the normal boot disk, run the following command:

$ nova unrescue SERVER

If you want to rescue an instance with a specific image, rather than the default one, use the --rescue_image_ref parameter:

$ nova rescue --rescue_image_ref IMAGE_ID SERVER