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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 routes.

In this lab you will create a route for each worker node that maps the node's Pod CIDR range to the node's internal IP address.

There are other ways to implement the Kubernetes networking model.

The Routing Table

In this section you will gather the information required to create routes in the kubernetes-vnet.

Print the internal IP address and Pod CIDR range for each worker instance:

for instance in worker-0 worker-1; do
  PRIVATE_IP_ADDRESS=$(az vm show -d -g kubernetes -n ${instance} --query "privateIps" -otsv)
  POD_CIDR=$(az vm show -g kubernetes --name ${instance} --query "tags" -o tsv)
  echo $PRIVATE_IP_ADDRESS $POD_CIDR
done

output

10.240.0.20 10.200.0.0/24
10.240.0.21 10.200.1.0/24

Routes

Create network routes for worker instance:

az network route-table create -g kubernetes -n kubernetes-routes
az network vnet subnet update -g kubernetes \
  -n kubernetes-subnet \
  --vnet-name kubernetes-vnet \
  --route-table kubernetes-routes
for i in 0 1; do
az network route-table route create -g kubernetes \
  -n kubernetes-route-10-200-${i}-0-24 \
  --route-table-name kubernetes-routes \
  --address-prefix 10.200.${i}.0/24 \
  --next-hop-ip-address 10.240.0.2${i} \
  --next-hop-type VirtualAppliance
done

List the routes in the kubernetes-vnet:

  az network route-table route list -g kubernetes --route-table-name kubernetes-routes -o table

output

AddressPrefix    HasBgpOverride    Name                            NextHopIpAddress    NextHopType       ProvisioningState    ResourceGroup
---------------  ----------------  ------------------------------  ------------------  ----------------  -------------------  ---------------
10.200.0.0/24    False             kubernetes-route-10-200-0-0-24  10.240.0.20         VirtualAppliance  Succeeded            kubernetes
10.200.1.0/24    False             kubernetes-route-10-200-1-0-24  10.240.0.21         VirtualAppliance  Succeeded            kubernetes

Next: Deploying the DNS Cluster Add-on