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11-configuring-networking.md

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Configure Kubernetes Networking

Multiple examples, I went with Weave Net.

Configure Kubernetes Networking - Calico

Run from admin machine.

Project Calico will be used for Kubernetes networking.

Configure the roles and bindings that Calico requires

kubectl apply -f \
https://docs.projectcalico.org/v3.1/getting-started/kubernetes/installation/hosted/rbac-kdd.yaml

Output

clusterrole "calico-node" created
clusterrolebinding "calico-node" created

Install Calico

kubectl apply -f \
https://docs.projectcalico.org/v3.1/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml

Output

configmap "calico-config" created
service "calico-typha" created
deployment "calico-typha" created
daemonset "calico-node" created
customresourcedefinition "felixconfigurations.crd.projectcalico.org" created
customresourcedefinition "bgppeers.crd.projectcalico.org" created
customresourcedefinition "bgpconfigurations.crd.projectcalico.org" created
customresourcedefinition "ippools.crd.projectcalico.org" created
customresourcedefinition "hostendpoints.crd.projectcalico.org" created
customresourcedefinition "clusterinformations.crd.projectcalico.org" created
customresourcedefinition "globalnetworkpolicies.crd.projectcalico.org" created
customresourcedefinition "globalnetworksets.crd.projectcalico.org" created
customresourcedefinition "networkpolicies.crd.projectcalico.org" created
serviceaccount "calico-node" created

Verification

Install calicoctl

brew install calicoctl

> DATASTORE_TYPE=kubernetes KUBECONFIG=~/.kube/config calicoctl get nodes
NAME
k8s-worker1
k8s-worker2
k8s-worker3

> DATASTORE_TYPE=kubernetes KUBECONFIG=~/.kube/config calicoctl get nodes -o wide
NAME          ASN         IPV4             IPV6
k8s-worker1   (unknown)   10.98.95.21/24
k8s-worker2   (unknown)   10.98.95.22/24
k8s-worker3   (unknown)   10.98.95.23/24

> DATASTORE_TYPE=kubernetes KUBECONFIG=~/.kube/config calicoctl get workloadendpoints --all
NAMESPACE     WORKLOAD                   NODE          NETWORKS         INTERFACE
default       busybox-68654f944b-qsn9m   k8s-worker2   10.98.101.6/32   cali6d834f43414
kube-system   coredns-75b467dc56-8n44m   k8s-worker2   10.98.101.7/32   calid4cc8c49012
kube-system   coredns-75b467dc56-f4f78   k8s-worker2

Configure Kubernetes Networking - Flannel

Install Flannel

kubectl apply -f \
https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

Output

clusterrole "flannel" created
clusterrolebinding "flannel" created
serviceaccount "flannel" created
configmap "kube-flannel-cfg" created
daemonset "kube-flannel-ds" created

Configure Kubernetes Networking - Weave Net

Install Weave Net

kubectl apply -f \
"https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

Output

serviceaccount "weave-net" configured
clusterrole "weave-net" configured
clusterrolebinding "weave-net" configured
role "weave-net" created
rolebinding "weave-net" created
daemonset "weave-net" created

Troubleshooting

Make sure that networking solutions don't conflict in folders

/etc/cni/net.d/
/opt/cni/bin

In case of changing the solution on Worker node

sudo rm -f /etc/cni/net.d/*
sudo shutdown -r now

after this can kubectl apply the new solution.