High CI/CD Question 195 of 226

How does a canary deploy work with a reverse proxy or load balancer?

MERN Full Stack · Speak this in 60–90 seconds · Faridabad & Delhi NCR

PICTURE THIS: STACK VS QUEUE

StackLIFOlast in, first out

QueueFIFOfirst in, first out

Simple meaning

The new version is deployed to a small subset of instances.

WHY — CI/CD instead of guessing?

Why interviewers care about CI/CD:

This is a process

question about CI/CD.

Panels listen for order,

trade-offs, and what you would actually do on a Full Stack project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

STEPS — What happens step by step?

Before you speak the answer, walk the interviewer through these steps:

1
The new version is
deployed to a small subset of instances.
2
nginx or the cloud
balancer weights a fraction of traffic there while metrics and error rates are watched.
3
If they spike, you
shift weight back without rebuilding.
4
Give an example
One tiny concrete case you can say aloud.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

EXAMPLE — See it in action

Here's a short line you can speak, broken into clear beats:

Say this line

“nginx or the cloud balancer weights a fraction of traffic there while metrics an”

Break into beats

nginxorthecloudbalancerweights

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Key takeaway

The new version is deployed to a small subset of instances. nginx or the cloud balancer weights a fraction of traffic there while metrics and error rates are watched.