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docs(infra mgmt): add maintenance mode explanation (#5480)

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Fixes #5477
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Olivier Lambert 2021-01-04 16:04:10 +01:00 committed by GitHub
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docs/manage_infrastructure.md
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@ -422,6 +422,29 @@ It works even if the VM is running, because we'll automatically export a snapsho
In the VM "Snapshots" tab, you can also export a snapshot like you export a VM.
## Hosts management
Outside updates (see next section), you can also do host management via Xen Orchestra. Basic operations are supported, like reboot, shutdown and so on.
But there's also some specific things, like Maintenance mode.
### Maintenance mode
:::warning
If you are using HA, maintenance mode will be required before doing any reboot or update. NEVER forget to enable maintenance in HA!
:::
Maintenance mode will trigger two actions internally:
* disabling the host (no new VMs could start on it)
* evacuate VMs that can be evacuated ("agile" VMs, which could be live migrated)
It's perfect if you want to shutdown the host for hardware replacement, or if you want to do some other operations without disrupting your production.
![](./assets/maintenancemode.png)
Note that maintenance mode will be **automatically exited after a host reboot**.
## Hosts updates
Patching a host manually can be time consuming (and boring). That's why we provide the high level feature of downloading and applying all missing patches automatically.