Recall & Review
beginner
What is blue-green deployment?
Blue-green deployment is a method to release software by running two identical environments called 'blue' and 'green'. One serves live traffic while the other is updated. After testing, traffic switches to the updated environment, reducing downtime.
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beginner
Why use containers for blue-green deployment?
Containers package applications and their dependencies consistently. This makes switching between blue and green environments fast and reliable, as containers can be started or stopped quickly without affecting the host system.
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intermediate
In blue-green deployment, what happens to the old environment after switching traffic?
The old environment (blue or green) remains running but idle. It can be used as a backup to quickly roll back if the new environment has issues, ensuring safer deployments.
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intermediate
How do you switch traffic between blue and green environments in container deployments?
Traffic is switched by updating the load balancer or reverse proxy configuration to point to the containers of the new environment. This change is usually instant, causing minimal downtime.
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beginner
Give a simple Docker command to run a container for the green environment on port 8081.
docker run -d --name green_app -p 8081:80 myapp:latest
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What is the main benefit of blue-green deployment?
✗ Incorrect
Blue-green deployment minimizes downtime by switching traffic between two environments.
In blue-green deployment, what does the 'green' environment usually represent?
✗ Incorrect
The green environment is typically the new version being prepared before switching live traffic.
Which Docker command option maps a container port to a host port?
✗ Incorrect
The '-p' option maps container ports to host ports.
What should you do if the new environment in blue-green deployment fails after switching?
✗ Incorrect
You switch traffic back to the old environment to quickly recover from failure.
Which tool is commonly used to route traffic between blue and green container environments?
✗ Incorrect
Load balancers or reverse proxies route traffic between blue and green environments.
Explain the steps involved in performing a blue-green deployment using containers.
Think about how you prepare, test, and switch environments safely.
You got /5 concepts.
Describe how containerization helps improve the blue-green deployment process.
Focus on container benefits like speed and consistency.
You got /4 concepts.