Practice Test Networking Weave

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Solution

How many Nodes are part of this cluster?
```
kunbectl get nodes
```
2
What is the Networking Solution used by this cluster?

Two ways to do this:
1. ```
kubectl get pods -n kube-system
```
2. ```
ls -l /opt/cni/bin
```
In both you see evidence of

weave
How many weave agents/peers are deployed in this cluster?
```
kubectl get pods -n kube-system
```
2
On which nodes are the weave peers present?
```
kubectl get pods -n kube-system -o wide
```
One on every node
Identify the name of the bridge network/interface created by weave on each node.

At either host…
```
ip addr list
```
weave

In actual fact, the network interface is weave and the bridge is implemented by vethwe-datapath@vethwe-bridge and vethwe-bridge@vethwe-datapath
What is the POD IP address range configured by weave?

Examine output of previous connad for weave interface. Note its IP begins with 10., so…

10.X.X.X
What is the default gateway configured on the PODs scheduled on node01?

Now we can deduce this from the naswer to the previous question. Since we know weave’s IP range, its gateway must be on the same network. However we can verify that by starting a pod which is known to contain the ip tool.

Remember this container image. It is extremely useful for debugging cluster networking issues!
```
kubectl run testpod --image=wbitt/network-multitool
```
Wait for it to be running.
```
kubectl exec -it testpod -- ip route
```
Note the first line of the output. This is the answer.