Merge pull request #3604 from replicatedhq/ipv6-limitation

Add IPv6 limitation to EC/KOTS/kURL

Author: paigecalvert

docs/enterprise/installing-general-requirements.mdx

@@ -266,7 +266,9 @@ KOTS has been tested for compatibility with the following registries:
 
 <DockerCompatibility/>
 
-## Firewall Openings for Online Installations with KOTS in an Existing Cluster {#firewall}
+## Network Requirements for Online Installations
+
+### Firewall Openings {#firewall}
 
 <FirewallOpeningsIntro/>
 
@@ -304,3 +306,7 @@ KOTS has been tested for compatibility with the following registries:
 &#42; Required only if the application uses the [Replicated proxy registry](/vendor/private-images-about).
 
 &#42;&#42; Required only if the application uses the [Replicated registry](/vendor/private-images-replicated).
+
+### IPv4 or IPv4/IPv6 Dual-Stack Only
+
+KOTS does not support online installations in single-stack IPv6-only environments. Environments that use IPv4 or dual-stack IPv4/IPv6 networking are supported.

docs/enterprise/installing-kurl-requirements.mdx

@@ -36,7 +36,9 @@ You must meet the additional kURL system requirements when applicable:
 
 - **Cloud Disk Performance**: For a list of cloud VM instance and disk combinations that are known to provide sufficient performance for etcd and pass the write latency preflight, see [Cloud Disk Performance](https://kurl.sh/docs/install-with-kurl/system-requirements#cloud-disk-performance) in the kURL documentation.
 
-## Firewall Openings for Online Installations with kURL {#firewall}
+## Network Requirements for Online Installations
+
+### Firewall Openings {#firewall}
 
 <FirewallOpeningsIntro/>
 
@@ -73,4 +75,8 @@ You must meet the additional kURL system requirements when applicable:
 
 &#42; Required only if the application uses the [Replicated proxy registry](/vendor/private-images-about).
 
-&#42;&#42; Required only if the application uses the [Replicated registry](/vendor/private-images-replicated).
+&#42;&#42; Required only if the application uses the [Replicated registry](/vendor/private-images-replicated).
+
+### IPv4 or IPv4/IPv6 Dual-Stack Only
+
+kURL does not support online installations in single-stack IPv6-only environments. Environments that use IPv4 or dual-stack IPv4/IPv6 networking are supported.

docs/vendor/embedded-overview.mdx

@@ -137,3 +137,5 @@ Embedded Cluster has the following limitations:
 * **Policy enforcement on Embedded Cluster workloads is not supported**: The Embedded Cluster runs workloads that require higher levels of privilege. If your application installs a policy enforcement engine such as Gatekeeper or Kyverno, ensure that its policies are not enforced in the namespaces used by Embedded Cluster.
 
 * **Installing on STIG- and CIS-hardened OS images is not supported**: Embedded Cluster isn't tested on these images, and issues have arisen when trying to install on them. Embedded Cluster version 2.8.0 and later will install in standard SELinux environments by setting appropriate SELinux file contexts on the bin directory and restoring SELinux contexts for the data directory after creation.
+
+* **Single-stack IPv6 not supported**: Embedded Cluster does not support installations in single-stack IPv6-only environments. Environments that use IPv4 or dual-stack IPv4/IPv6 networking are supported.