From 05a0cfa8f52b64d49cb7cc64f8a2adffeb371ee0 Mon Sep 17 00:00:00 2001
From: Avi Zimmerman <avi.zimmerman@gmail.com>
Date: Sun, 15 Oct 2023 21:31:09 +0300
Subject: [PATCH] docs: start building out multi-cluster example

---
 deploy/bundle.yaml                      |  2 +-
 deploy/config/configmap.yaml            |  2 +-
 examples/multi-cluster/.gitignore       |  1 +
 examples/multi-cluster/cluster-one.yaml |  6 +----
 examples/multi-cluster/cluster-two.yaml |  6 +----
 examples/multi-cluster/setup.sh         | 33 +++++++++++++++++++++++++
 examples/multi-cluster/teardown.sh      |  9 +++++++
 7 files changed, 47 insertions(+), 12 deletions(-)
 create mode 100644 examples/multi-cluster/.gitignore
 create mode 100755 examples/multi-cluster/setup.sh
 create mode 100755 examples/multi-cluster/teardown.sh

diff --git a/deploy/bundle.yaml b/deploy/bundle.yaml
index b6ea640..9476de7 100644
--- a/deploy/bundle.yaml
+++ b/deploy/bundle.yaml
@@ -1224,7 +1224,7 @@ data:
   cluster-domain: "cluster.local"
   # TODO: Currently IPv6 address space is computed at bootstrap,
   # But we should allow this to be configured with the IPv4 address space.
-  pod-cidr: "10.42.0.0/16,fd00:10:24::/48"
+  pod-cidr: "10.42.0.0/16,fd00:10:42::/48"
   service-cidr: "10.96.0.0/12,fd00:10:96::/112"
   # The network config to install on each node.
   # You can enable/disable IPv4/IPv6 on dual-stack nodes by adjusting the
diff --git a/deploy/config/configmap.yaml b/deploy/config/configmap.yaml
index ac255c6..69abf9e 100644
--- a/deploy/config/configmap.yaml
+++ b/deploy/config/configmap.yaml
@@ -12,7 +12,7 @@ data:
   cluster-domain: "cluster.local"
   # TODO: Currently IPv6 address space is computed at bootstrap,
   # But we should allow this to be configured with the IPv4 address space.
-  pod-cidr: "10.42.0.0/16,fd00:10:24::/48"
+  pod-cidr: "10.42.0.0/16,fd00:10:42::/48"
   service-cidr: "10.96.0.0/12,fd00:10:96::/112"
   # The network config to install on each node.
   # You can enable/disable IPv4/IPv6 on dual-stack nodes by adjusting the
diff --git a/examples/multi-cluster/.gitignore b/examples/multi-cluster/.gitignore
new file mode 100644
index 0000000..7cc402c
--- /dev/null
+++ b/examples/multi-cluster/.gitignore
@@ -0,0 +1 @@
+*.kubeconfig
diff --git a/examples/multi-cluster/cluster-one.yaml b/examples/multi-cluster/cluster-one.yaml
index b9b374e..e55415c 100644
--- a/examples/multi-cluster/cluster-one.yaml
+++ b/examples/multi-cluster/cluster-one.yaml
@@ -1,6 +1,6 @@
 kind: Cluster
 apiVersion: kind.x-k8s.io/v1alpha4
-name: webmesh-cni
+name: multi-cluster-one
 networking:
   ipFamily: dual
   disableDefaultCNI: true
@@ -12,7 +12,3 @@ nodes:
   extraMounts:
   - hostPath: /dev/net/tun
     containerPath: /dev/net/tun
-- role: worker
-  extraMounts:
-  - hostPath: /dev/net/tun
-    containerPath: /dev/net/tun
diff --git a/examples/multi-cluster/cluster-two.yaml b/examples/multi-cluster/cluster-two.yaml
index 02bab3d..82aa4fc 100644
--- a/examples/multi-cluster/cluster-two.yaml
+++ b/examples/multi-cluster/cluster-two.yaml
@@ -1,6 +1,6 @@
 kind: Cluster
 apiVersion: kind.x-k8s.io/v1alpha4
-name: webmesh-cni
+name: multi-cluster-two
 networking:
   ipFamily: dual
   disableDefaultCNI: true
@@ -12,7 +12,3 @@ nodes:
   extraMounts:
   - hostPath: /dev/net/tun
     containerPath: /dev/net/tun
-- role: worker
-  extraMounts:
-  - hostPath: /dev/net/tun
-    containerPath: /dev/net/tun
diff --git a/examples/multi-cluster/setup.sh b/examples/multi-cluster/setup.sh
new file mode 100755
index 0000000..22c4500
--- /dev/null
+++ b/examples/multi-cluster/setup.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+
+CLUSTER_NAME_PREFIX=${CLUSTER_NAME_PREFIX:-multi-cluster}
+
+set -ex
+
+# Create the clusters
+
+kind create cluster \
+    --name ${CLUSTER_NAME_PREFIX}-one \
+    --config ./cluster-one.yaml \
+    --kubeconfig ./cluster-one.kubeconfig
+kubectl --kubeconfig ./cluster-one.kubeconfig \
+        config set-context --current --namespace kube-system
+
+kind create cluster \
+    --name ${CLUSTER_NAME_PREFIX}-two \
+    --config ./cluster-two.yaml \
+    --kubeconfig ./cluster-two.kubeconfig
+kubectl --kubeconfig ./cluster-two.kubeconfig \
+        config set-context --current --namespace kube-system
+
+# Install the kubernetes configurations to each cluster
+
+kubectl --kubeconfig ./cluster-one.kubeconfig \
+        --namespace kube-system \
+        create secret generic cluster-two-credentials \
+        --from-file=kubeconfig=./cluster-two.kubeconfig
+
+kubectl --kubeconfig ./cluster-two.kubeconfig \
+        --namespace kube-system \
+        create secret generic cluster-one-credentials \
+        --from-file=kubeconfig=./cluster-one.kubeconfig
diff --git a/examples/multi-cluster/teardown.sh b/examples/multi-cluster/teardown.sh
new file mode 100755
index 0000000..23691e1
--- /dev/null
+++ b/examples/multi-cluster/teardown.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+CLUSTER_NAME_PREFIX=${CLUSTER_NAME_PREFIX:-multi-cluster}
+
+set -ex
+
+kind delete cluster --name ${CLUSTER_NAME_PREFIX}-one
+kind delete cluster --name ${CLUSTER_NAME_PREFIX}-two
+rm -f cluster-one.kubeconfig cluster-two.kubeconfig