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Update uninstall.md

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Wayne Song 2017-02-16 16:15:14 -08:00 committed by Joao Fernandes
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datacenter/ucp/2.1/guides/admin/install/uninstall.md
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@ -33,6 +33,16 @@ for any necessary configuration values.
[Check the reference documentation](../../../reference/cli/index.md) to learn the options
available in the `uninstall-ucp` command.
## Swarm mode CA
After uninstalling UCP, the nodes in your cluster will still be in swarm mode, but you cannot
join new nodes until you reinstall UCP, because swarm mode was relying on UCP to provide the
CA certificates that allow nodes in the cluster to identify each other. Additionally, since
swarm mode is no longer controlling its own certificates, if the certificates expire after
you uninstall UCP the nodes in the cluster will not be able to communicate at all. To fix this,
either reinstall UCP before the certificates expire or disable swarm mode by running
`docker swarm leave --force` on every node.
## Where to go next
* [Scale your cluster](../configure/scale-your-cluster.md)