Exploring the High-Availability and Fault-Tolerance
In this lesson, we will explore the high-availability and fault tolerance of our cluster.
The cluster would not be reliable if it wouldn’t be fault tolerant. Kops intents to make it so, but we’re going to validate that anyways.
Terminating a Worker Node
Let’s retrieve the list of worker node instances.
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aws ec2 \describe-instances | jq -r \".Reservations[].Instances[] \| select(.SecurityGroups[]\.GroupName==\"nodes.$NAME\")\.InstanceId"
We used aws ec2 describe-instances to retrieve all the instances (five in total). The output was sent to jq, which filtered them by the security group dedicated to worker nodes.
The output is as follows.
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i-063fabc7ad5935db5i-04d32c91cfc084369
We’ll terminate one of the worker nodes. To do that, we’ll pick a random one, ...
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