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11-pod-network-routes.md

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Provisioning Pod Network Routes

Pods scheduled to a node receive an IP address from the node's Pod CIDR range. At this point pods can not communicate with other pods running on different nodes due to missing network

There are other ways to implement the Kubernetes networking model.

Routes

Simplest solution is running kube-router with service proxy:

wget https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/generic-kuberouter-all-features.yaml

Edit the generic-kuberouter-all-features.yaml file and change clusterCIDR and api server:

 ...
 kubeconfig: |
    apiVersion: v1
    kind: Config
    clusterCIDR: "10.200.0.0/16"
    clusters:
    - name: cluster
      cluster:
        certificate-authority: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        server: https://192.168.1.174:6443

kubectl apply -f generic-kuberouter-all-features.yaml

This should run kube-router on all worker nodes. After this:

kubectl get nodes

should print:

NAME       STATUS   ROLES    AGE     VERSION
worker-1   Ready    <none>   35m     v1.12.0
worker-2   Ready    <none>   5m9s    v1.12.0
worker-3   Ready    <none>   2m28s   v1.12.0

If for some reason you need to reinstall kube-router or change the config, check the /var/lib/kube-router/kubeconfig file. That's initialized when kube-router is installed, and stays there even if you remove it, so if you change addresses, make sure that file is up to date.

Next: Deploying the DNS Cluster Add-on