61 lines
2.2 KiB
Markdown
61 lines
2.2 KiB
Markdown
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# Provisioning Pod Network Routes
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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](https://cloud.google.com/compute/docs/vpc/routes).
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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.
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> There are [other ways](https://kubernetes.io/docs/concepts/cluster-administration/networking/#how-to-achieve-this) to implement the Kubernetes networking model.
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## The Routing Table
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In this section you will gather the information required to create routes in the `kubernetes-the-hard-way` VPC network.
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Print the internal IP address and Pod CIDR range for each worker instance:
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```
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for instance in worker-0 worker-1 worker-2; do
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gcloud compute instances describe ${instance} \
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--format 'value[separator=" "](networkInterfaces[0].networkIP,metadata.items[0].value)'
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done
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```
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> output
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```
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10.240.0.20 10.200.0.0/24
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10.240.0.21 10.200.1.0/24
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10.240.0.22 10.200.2.0/24
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```
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## Routes
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Create network routes for each worker instance:
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```
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for i in 0 1 2; do
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gcloud compute routes create kubernetes-route-10-200-${i}-0-24 \
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--network kubernetes-the-hard-way \
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--next-hop-address 10.240.0.2${i} \
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--destination-range 10.200.${i}.0/24
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done
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```
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List the routes in the `kubernetes-the-hard-way` VPC network:
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```
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gcloud compute routes list --filter "network kubernetes-the-hard-way"
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```
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> output
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```
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NAME NETWORK DEST_RANGE NEXT_HOP PRIORITY
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default-route-77bcc6bee33b5535 kubernetes-the-hard-way 10.240.0.0/24 1000
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default-route-b11fc914b626974d kubernetes-the-hard-way 0.0.0.0/0 default-internet-gateway 1000
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kubernetes-route-10-200-0-0-24 kubernetes-the-hard-way 10.200.0.0/24 10.240.0.20 1000
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kubernetes-route-10-200-1-0-24 kubernetes-the-hard-way 10.200.1.0/24 10.240.0.21 1000
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kubernetes-route-10-200-2-0-24 kubernetes-the-hard-way 10.200.2.0/24 10.240.0.22 1000
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```
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Next: [Deploying the DNS Cluster Add-on](12-dns-addon.md)
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