Created
July 22, 2021 04:48
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kind cross cluster
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| #!/bin/bash | |
| set -eux | |
| SUBNET_A="10.10.0.0/16" | |
| SUBNET_B="10.20.0.0/16" | |
| CONFIG_A=$(cat <<EOF | |
| kind: Cluster | |
| apiVersion: kind.x-k8s.io/v1alpha4 | |
| networking: | |
| podSubnet: ${SUBNET_A} | |
| serviceSubnet: 10.96.0.0/12 | |
| kubeadmConfigPatches: | |
| - | | |
| apiVersion: kubeadm.k8s.io/v1beta2 | |
| kind: ClusterConfiguration | |
| networking: | |
| dnsDomain: "cluster1.com" | |
| EOF | |
| ) | |
| CONFIG_B=$(cat <<EOF | |
| kind: Cluster | |
| apiVersion: kind.x-k8s.io/v1alpha4 | |
| networking: | |
| podSubnet: ${SUBNET_B} | |
| serviceSubnet: 10.96.0.0/12 | |
| kubeadmConfigPatches: | |
| - | | |
| apiVersion: kubeadm.k8s.io/v1beta2 | |
| kind: ClusterConfiguration | |
| networking: | |
| dnsDomain: "cluster2.com" | |
| EOF | |
| ) | |
| kind create cluster --name a --config <(echo "${CONFIG_A}") --wait 60s | |
| kind create cluster --name b --config <(echo "${CONFIG_B}") --wait 60s | |
| DOCKER_IP_A=$(docker inspect -f "{{ .NetworkSettings.Networks.kind.IPAddress }}" a-control-plane) | |
| DOCKER_IP_B=$(docker inspect -f "{{ .NetworkSettings.Networks.kind.IPAddress }}" b-control-plane) | |
| POD_CIDR_A=$(KUBECONFIG="$(kind export kubeconfig --name a)" kubectl get node -ojsonpath='{.items[0].spec.podCIDR}') | |
| POD_CIDR_B=$(KUBECONFIG="$(kind export kubeconfig --name b)" kubectl get node -ojsonpath='{.items[0].spec.podCIDR}') | |
| docker exec a-control-plane ip route add ${POD_CIDR_B} via ${DOCKER_IP_B} | |
| docker exec b-control-plane ip route add ${POD_CIDR_A} via ${DOCKER_IP_A} | |
| cat << EOF | kubectl apply --context=kind-a -f - | |
| apiVersion: v1 | |
| kind: Service | |
| metadata: | |
| name: coredns-service | |
| namespace: kube-system | |
| spec: | |
| type: NodePort | |
| selector: | |
| k8s-app: kube-dns | |
| ports: | |
| - name: dns | |
| port: 53 | |
| protocol: UDP | |
| targetPort: 53 | |
| - name: dns-tcp | |
| port: 53 | |
| protocol: TCP | |
| targetPort: 53 | |
| - name: metrics | |
| port: 9153 | |
| protocol: TCP | |
| targetPort: 9153 | |
| EOF | |
| cat << EOF | kubectl apply --context=kind-b -f - | |
| apiVersion: v1 | |
| kind: Service | |
| metadata: | |
| name: coredns-service | |
| namespace: kube-system | |
| spec: | |
| type: NodePort | |
| selector: | |
| k8s-app: kube-dns | |
| ports: | |
| - name: dns | |
| port: 53 | |
| protocol: UDP | |
| targetPort: 53 | |
| - name: dns-tcp | |
| port: 53 | |
| protocol: TCP | |
| targetPort: 53 | |
| - name: metrics | |
| port: 9153 | |
| protocol: TCP | |
| targetPort: 9153 | |
| EOF |
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