From 278fd9ae468beeb9ad6742a285a82d971193bd23 Mon Sep 17 00:00:00 2001
From: Al Bailey <Al.Bailey@windriver.com>
Date: Wed, 28 Aug 2019 12:16:40 -0500
Subject: [PATCH] Enable kubernetes SCTPSupport feature

The feature gate for sctp support in apiserver was added in
kubernetes 1.12 but is disabled by default.  This commit enables it.

Information about SCTP is here:
https://kubernetes.io/docs/concepts/services-networking/service/#sctp

The centos version of netcat can be used to validate the feature.
A Dockerfile for building a centos netcat is provided.

Tested by:

kubectl run --generator=run-pod/v1 --image netcat:v1.0.0 \
    listen-sctp -it --rm -- --sctp -l -p 9000

(get IP of the listener pod)
kubectl run --generator=run-pod/v1 --image netcat:v1.0.0 \
   test-sctp -it --rm -- --sctp <listener pod IP> 9000

Change-Id: I9642e485cb9c30f6b1272c00ec1046b9c98211ac
Story: 2006472
Task: 36403
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>
---
 .../src/modules/platform/templates/kubeadm.yaml.erb          | 1 +
 tools/docker/images/Dockerfile                               | 4 ++++
 tools/docker/images/Readme.rst                               | 5 +++++
 3 files changed, 10 insertions(+)
 create mode 100644 tools/docker/images/Dockerfile
 create mode 100644 tools/docker/images/Readme.rst

diff --git a/puppet-manifests/src/modules/platform/templates/kubeadm.yaml.erb b/puppet-manifests/src/modules/platform/templates/kubeadm.yaml.erb
index 73c82111e3..5b79aec95c 100644
--- a/puppet-manifests/src/modules/platform/templates/kubeadm.yaml.erb
+++ b/puppet-manifests/src/modules/platform/templates/kubeadm.yaml.erb
@@ -17,6 +17,7 @@ apiServer:
     oidc-client-id: <%= @apiserver_oidc_client_id %>
     oidc-issuer-url: <%= @apiserver_oidc_issuer_url %>
     oidc-username-claim: <%= @apiserver_oidc_username_claim %>
+    feature-gates: "SCTPSupport=true"
 controllerManager:
   extraArgs:
     node-monitor-period: "2s"
diff --git a/tools/docker/images/Dockerfile b/tools/docker/images/Dockerfile
new file mode 100644
index 0000000000..2d014979ec
--- /dev/null
+++ b/tools/docker/images/Dockerfile
@@ -0,0 +1,4 @@
+FROM centos
+RUN yum install -y nc
+ENTRYPOINT ["nc"]
+CMD ["nc"]
diff --git a/tools/docker/images/Readme.rst b/tools/docker/images/Readme.rst
new file mode 100644
index 0000000000..09b02a9d84
--- /dev/null
+++ b/tools/docker/images/Readme.rst
@@ -0,0 +1,5 @@
+export VERSION=v1.0.0
+sudo docker build \
+  --network host \
+  -t netcat:${VERSION} \
+  .