explain the offline and restart migration

Signed-off-by: Dominik Csapak <d.csa...@proxmox.com>
 pct.adoc | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/pct.adoc b/pct.adoc
index 171a4a5..4ca8d7e 100644
--- a/pct.adoc
+++ b/pct.adoc
@@ -692,6 +692,26 @@ NOTE: If you have changed the container's configuration 
since the last start
 attempt with `pct start`, you need to run `pct start` at least once to also
 update the configuration used by `lxc-start`.
+If you have a cluster, you can migrate your Containers with
+ pct migrate <vmid> <target>
+This works as long as your Container is offline. If it has local volumes or
+mountpoints defined, the migration will copy the content over the network to
+the target host if there is the same storage defined.
+If you want to migrate online Containers, the only way is to use
+restart migration. This can be initiated with the -restart flag and the 
+-timeout parameter.
+A restart migration will shut down the Container and kill it after the 
+timeout (the default is 180 seconds). Then it will migrate the Container
+like an offline migration and when finished, it starts the Container on the
+target node.

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