markobean commented on a change in pull request #5264:
URL: https://github.com/apache/nifi/pull/5264#discussion_r680958927
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File path: nifi-docs/src/main/asciidoc/administration-guide.adoc
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@@ -2003,6 +2003,31 @@ one of the nodes, and the User Interface should look
similar to the following:
image:ncm.png["Clustered User Interface"]
+[[cluster_firewall_configuration]]
+=== Cluster Firewall Configuration
+
+NiFi clustering supports network access restrictions using a custom firewall
configuration.
+The `nifi.cluster.firewall.file` property can be configured with a path to a
file containing hostnames, IP addresses, or
+subnets of permitted nodes. The Cluster Coordinator uses the configuration to
determine whether to accept or reject
+heartbeats and connection requests from potential cluster members.
+
+The configuration file format expects one entry per line and ignores lines
beginning with the `#` character. NiFi uses
+standard hostname resolution to convert names to IP addresses. The
configuration file supports IPv4 addresses or subnet
Review comment:
Yes, that looks good. Thanks.
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