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Question 136 - Professional Cloud DevOps Engineer discussion

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You are the Operations Lead for an ongoing incident with one of your services. The service usually runs at around 70% capacity. You notice that one node is returning 5xx errors for all requests. There has also been a noticeable increase in support cases from customers. You need to remove the offending node from the load balancer pool so that you can isolate and investigate the node. You want to follow Google-recommended practices to manage the incident and reduce the impact on users. What should you do?

A.
1. Communicate your intent to the incident team. 2. Perform a load analysis to determine if the remaining nodes can handle the increase in traffic offloaded from the removed node, and scale appropriately. 3. When any new nodes report healthy, drain traffic from the unhealthy node, and remove the unhealthy node from service.
Answers
A.
1. Communicate your intent to the incident team. 2. Perform a load analysis to determine if the remaining nodes can handle the increase in traffic offloaded from the removed node, and scale appropriately. 3. When any new nodes report healthy, drain traffic from the unhealthy node, and remove the unhealthy node from service.
B.
1. Communicate your intent to the incident team. 2. Add a new node to the pool, and wait for the new node to report as healthy. 3. When traffic is being served on the new node, drain traffic from the unhealthy node, and remove the old node from service.
Answers
B.
1. Communicate your intent to the incident team. 2. Add a new node to the pool, and wait for the new node to report as healthy. 3. When traffic is being served on the new node, drain traffic from the unhealthy node, and remove the old node from service.
C.
1 . Drain traffic from the unhealthy node and remove the node from service. 2. Monitor traffic to ensure that the error is resolved and that the other nodes in the pool are handling the traffic appropriately. 3. Scale the pool as necessary to handle the new load. 4. Communicate your actions to the incident team.
Answers
C.
1 . Drain traffic from the unhealthy node and remove the node from service. 2. Monitor traffic to ensure that the error is resolved and that the other nodes in the pool are handling the traffic appropriately. 3. Scale the pool as necessary to handle the new load. 4. Communicate your actions to the incident team.
D.
1 . Drain traffic from the unhealthy node and remove the old node from service. 2. Add a new node to the pool, wait for the new node to report as healthy, and then serve traffic to the new node. 3. Monitor traffic to ensure that the pool is healthy and is handling traffic appropriately. 4. Communicate your actions to the incident team.
Answers
D.
1 . Drain traffic from the unhealthy node and remove the old node from service. 2. Add a new node to the pool, wait for the new node to report as healthy, and then serve traffic to the new node. 3. Monitor traffic to ensure that the pool is healthy and is handling traffic appropriately. 4. Communicate your actions to the incident team.
Suggested answer: A

Explanation:

The correct answer is A. Communicate your intent to the incident team. Perform a load analysis to determine if the remaining nodes can handle the increase in traffic offloaded from the removed node, and scale appropriately. When any new nodes report healthy, drain traffic from the unhealthy node, and remove the unhealthy node from service.

This answer follows the Google-recommended practices for incident management, as described in the Chapter 9 - Incident Response, Google SRE Book1. According to this source, some of the best practices are:

Maintain a clear line of command. Designate clearly defined roles. Keep a working record of debugging and mitigation as you go. Declare incidents early and often.

Communicate your intent before taking any action that might affect the service or the incident response. This helps to avoid confusion, duplication of work, or unintended consequences.

Perform a load analysis before removing a node from the load balancer pool, as this might affect the capacity and performance of the service. Scale the pool as necessary to handle the expected load.

Drain traffic from the unhealthy node before removing it from service, as this helps to avoid dropping requests or causing errors for users.

Answer A follows these best practices by communicating the intent to the incident team, performing a load analysis and scaling the pool, and draining traffic from the unhealthy node before removing it.

Answer B does not follow the best practice of performing a load analysis before adding or removing nodes, as this might cause overloading or underutilization of resources.

Answer C does not follow the best practice of communicating the intent before taking any action, as this might cause confusion or conflict with other responders.

Answer D does not follow the best practice of draining traffic from the unhealthy node before removing it, as this might cause errors for users.

1: Chapter 9 - Incident Response, Google SRE Book

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asked 18/09/2024
Ricardo Andres
30 questions
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