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ha-manager.adoc: add new section Node Maintenance

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Dietmar Maurer 2016-11-22 07:40:01 +01:00
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@ -624,13 +624,52 @@ killing its process)
* *after* you fixed all errors you may enable the service again
Node Power Status
-----------------
Node Maintenance
----------------
If a node needs maintenance you should migrate and or relocate all
services which are required to run always on another node first.
After that you can stop the LRM and CRM services. But note that the
watchdog triggers if you stop it with active services.
It is sometimes possible to shutdown or reboot a node to do
maintenance tasks. Either to replace hardware, or simply to install a
new kernel image.
Shutdown
~~~~~~~~
A shutdown ('poweroff') is usually done if the node is planned to stay
down for some time. The LRM stops all managed services in that
case. This means that other nodes will take over those service
afterwards.
NOTE: Recent hardware has large amounts of RAM. So we stop all
resources, then restart them to avoid online migration of all that
RAM. If you want to use online migration, you need to invoke that
manually before you shutdown the node.
Reboot
~~~~~~
Node reboots are initiated with the 'reboot' command. This is usually
done after installing a new kernel. Please note that this is different
from ``shutdown'', because the node immediately starts again.
The LRM tells the CRM that it wants to restart, and waits until the
CRM puts all resources into the `freeze` state. This prevents that
those resources are moved to other nodes. Instead, the CRM start the
resources after the reboot on the same node.
Manual Resource Movement
~~~~~~~~~~~~~~~~~~~~~~~~
Last but not least, you can also move resources manually to other
nodes before you shutdown or restart a node. The advantage is that you
have full control, and you can decide if you want to use online
migration or not.
NOTE: Please do not 'kill' services like `pve-ha-crm`, `pve-ha-lrm` or
`watchdog-mux`. They manage and use the watchdog, so this can result
in a node reboot.
[[ha_manager_package_updates]]