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The chapter 'Adding Pod Network Routes' is updated.

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Pick1a1username 2019-02-17 01:00:09 +09:00
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README.md
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@ -35,7 +35,7 @@ This tutorial assumes you have access to the [Google Cloud Platform](https://clo
* [Bootstrapping the Kubernetes Control Plane](docs/08-bootstrapping-kubernetes-controllers.md) * [Bootstrapping the Kubernetes Control Plane](docs/08-bootstrapping-kubernetes-controllers.md)
* [Bootstrapping the Kubernetes Worker Nodes](docs/09-bootstrapping-kubernetes-workers.md) * [Bootstrapping the Kubernetes Worker Nodes](docs/09-bootstrapping-kubernetes-workers.md)
* [Configuring kubectl for Remote Access](docs/10-configuring-kubectl.md) * [Configuring kubectl for Remote Access](docs/10-configuring-kubectl.md)
* [Provisioning Pod Network Routes](docs/11-pod-network-routes.md) * [Adding Pod Network Routes](docs/11-pod-network-routes.md)
* [Deploying the DNS Cluster Add-on](docs/12-dns-addon.md) * [Deploying the DNS Cluster Add-on](docs/12-dns-addon.md)
* [Smoke Test](docs/13-smoke-test.md) * [Smoke Test](docs/13-smoke-test.md)
* [Cleaning Up](docs/14-cleanup.md) * [Cleaning Up](docs/14-cleanup.md)

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docs/11-pod-network-routes.md
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# Provisioning Pod Network Routes # Adding 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](https://cloud.google.com/compute/docs/vpc/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. In this chapter, you will create routes for each worker node that maps the node's Pod CIDR range to the node's IP address.
> There are [other ways](https://kubernetes.io/docs/concepts/cluster-administration/networking/#how-to-achieve-this) to implement the Kubernetes networking model. > There are [other ways](https://kubernetes.io/docs/concepts/cluster-administration/networking/#how-to-achieve-this) to implement the Kubernetes networking model.
## The Routing Table *The instructions in this chapter should be done in the host, not in the virtual machines.*
In this section you will gather the information required to create routes in the `kubernetes-the-hard-way` VPC network.
Print the internal IP address and Pod CIDR range for each worker instance:
```
for instance in worker-0 worker-1 worker-2; do
gcloud compute instances describe ${instance} \
--format 'value[separator=" "](networkInterfaces[0].networkIP,metadata.items[0].value)'
done
```
> output
```
10.240.0.20 10.200.0.0/24
10.240.0.21 10.200.1.0/24
10.240.0.22 10.200.2.0/24
```
## Routes ## Routes
Get the bridge name of `kubernetes-nw`.
```
$ KUBERNETES_BRIDGE=$(sudo virsh net-info kubernetes-nw | grep Bridge | awk '{ print $2}')
```
Create network routes for each worker instance: Create network routes for each worker instance:
``` ```
for i in 0 1 2; do $ for i in 1 2 3; do
gcloud compute routes create kubernetes-route-10-200-${i}-0-24 \ sudo ip route add 10.200.${i}.0/24 via 10.240.0.2${i} dev ${KUBERNETES_BRIDGE}
--network kubernetes-the-hard-way \
--next-hop-address 10.240.0.2${i} \
--destination-range 10.200.${i}.0/24
done done
``` ```
List the routes in the `kubernetes-the-hard-way` VPC network: List the routes in the host:
``` ```
gcloud compute routes list --filter "network: kubernetes-the-hard-way" $ ip route
``` ```
> output > output
``` ```
NAME NETWORK DEST_RANGE NEXT_HOP PRIORITY default via 172.16.0.1 dev wlp4s0 proto dhcp metric 600
default-route-081879136902de56 kubernetes-the-hard-way 10.240.0.0/24 kubernetes-the-hard-way 1000 10.200.1.0/24 via 10.240.0.21 dev virbr1
default-route-55199a5aa126d7aa kubernetes-the-hard-way 0.0.0.0/0 default-internet-gateway 1000 10.200.2.0/24 via 10.240.0.22 dev virbr1
kubernetes-route-10-200-0-0-24 kubernetes-the-hard-way 10.200.0.0/24 10.240.0.20 1000 10.200.3.0/24 via 10.240.0.23 dev virbr1
kubernetes-route-10-200-1-0-24 kubernetes-the-hard-way 10.200.1.0/24 10.240.0.21 1000 10.240.0.0/24 dev virbr1 proto kernel scope link src 10.240.0.1
kubernetes-route-10-200-2-0-24 kubernetes-the-hard-way 10.200.2.0/24 10.240.0.22 1000
(...)
``` ```
Next: [Deploying the DNS Cluster Add-on](12-dns-addon.md) Next: [Deploying the DNS Cluster Add-on](12-dns-addon.md)