add node how to update ssl cert on cluster

diff --git a/pmg-ssl-certificate.adoc b/pmg-ssl-certificate.adoc
index bddba6c936a43b59610e5d7343a654feccd1b0e5..32480137e4dd7ff0c8434e8d4777abbb02a8077e 100644 (file)
--- a/pmg-ssl-certificate.adoc
+++ b/pmg-ssl-certificate.adoc
@@ -53,3 +53,17 @@ NOTE: To transfer files from and to your Proxmox, you can use secure
 copy: If you desktop is Linux, you can use the `scp` command line
 tool. If your desktop PC is windows, please use a scp client like
 WinSCP (see http://winscp.net/).
+
+
+Change Certificate for Cluster Setups
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you change the API certificate of an active cluster node, you also
+need to update the fingerprint inside the cluster configuration file
+`cluster.conf`. It is best to edit that file on the master node.
+
+To show the actual fingerprint use:
+
+----
+openssl x509 -in /etc/pmg/pmg-api.pem -noout -fingerprint -sha256
+----