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Ivan Anfimov 107b2025fe docs: update structure for scaling your environment

It seems to me that there is too much information on one page, I have divided it into several pages for easier reading, as was already done on the pages:
https://docs.openstack.org/openstack-ansible/latest/admin/openstack-firstrun.html
https://docs.openstack.org/openstack-ansible/latest/admin/openstack-firstrun.html
https://docs.openstack.org/openstack-ansible/latest/admin/maintenance-tasks.html

Change-Id: Ic58e0c764f21c377b72e7229d1c053864b601785

2025-05-23 17:23:34 +00:00

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Shutting down the Compute host

If a Compute host needs to be shut down:

Disable the nova-compute binary:

# nova service-disable --reason "Hardware replacement" HOSTNAME nova-compute

List all running instances on the Compute host:

# nova list --all-t --host <compute_name> | awk '/ACTIVE/ {print $2}' > \
/home/user/running_instances && for i in `cat /home/user/running_instances`; do nova stop $i ; done

Use SSH to connect to the Compute host.
Confirm all instances are down:
```
# virsh list --all
```
Shut down the Compute host:
```
# shutdown -h now
```
Once the Compute host comes back online, confirm everything is in working order and start the instances on the host. For example:
```
# cat /home/user/running_instances
# do nova start $instance
  done
```
Enable the nova-compute service in the environment:
```
# nova service-enable HOSTNAME nova-compute
```

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Shutting down the Compute host

1.1 KiB

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