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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 k8s-the-hard-way VPC network.

Create the Azure route table

az network route-table create --resource-group k8s-the-hard-way --name k8s-the-hard-way-rt

Routes

Create network routes for each worker instance:

for i in 0 1 2; do
  az network route-table route create \
    --resource-group k8s-the-hard-way \
    --name k8s-the-hard-way-route-10-200-${i}-0-24 \
    --route-table-name k8s-the-hard-way-rt \
    --next-hop-type VirtualAppliance \
    --next-hop-ip-address 10.240.0.2${i} \
    --address-prefix 10.200.${i}.0/24
done

az network vnet subnet update \
  --resource-group k8s-the-hard-way \
  --vnet-name k8s-the-hard-way-vnet \
  --name k8s-the-hard-way-subnet \
  --route-table k8s-the-hard-way-rt

List the routes in the k8s-the-hard-way VPC network:

az network route-table route list --resource-group k8s-the-hard-way --route-table-name k8s-the-hard-way-rt -o table

output

AddressPrefix    HasBgpOverride    Name                                  NextHopIpAddress    NextHopType       ProvisioningState    ResourceGroup
---------------  ----------------  ------------------------------------  ------------------  ----------------  -------------------  ----------------
10.200.0.0/24    False             k8s-the-hard-way-route-10-200-0-0-24  10.240.0.20         VirtualAppliance  Succeeded            k8s-the-hard-way
10.200.1.0/24    False             k8s-the-hard-way-route-10-200-1-0-24  10.240.0.21         VirtualAppliance  Succeeded            k8s-the-hard-way
10.200.2.0/24    False             k8s-the-hard-way-route-10-200-2-0-24  10.240.0.22         VirtualAppliance  Succeeded            k8s-the-hard-way

Next: Deploying the DNS Cluster Add-on