Use Kubernetes Primitives to Implement Common Deployment Strategies (e.g. Blue/green or Canary) CKAD Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   What is the effect of changing a Service's selector from 'version: blue' to 'version: green'?

   • AThe Service's ClusterIP changes to a new address
   • BAll traffic to the Service is immediately routed to pods with the label 'version: green'
   • CThe blue Deployment is automatically deleted
   • DThe green Deployment is automatically scaled up
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2. 12application · medium

   A team is implementing a blue/green deployment for an application that requires a database schema migration. The new version (green) needs to connect to a different database than the old version (blue). How should they configure the green Deployment to use the new database without affecting the blue Deployment?

   • AUse environment variables directly in the green Deployment's pod spec, bypassing ConfigMaps.
   • BUpdate the existing ConfigMap used by both Deployments with the new database connection string.
   • CCreate a new ConfigMap or Secret for the green Deployment with the new database connection string, and reference it in the green Deployment's pod spec.
   • DModify the green Deployment to use the same database as blue, and handle the schema migration in the application code.
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4. 13application · medium

   A team is implementing a blue/green deployment for a stateless web application. They have created two Deployments, 'web-blue' and 'web-green', each with its own ConfigMap for environment-specific settings. They want to switch traffic from blue to green. What is the correct sequence of actions?

   • AUpdate the ConfigMap used by the blue Deployment to match green, then update the Service selector.
   • BEnsure the green Deployment's pods are Ready, then update the Service selector to point to 'web-green'.
   • CScale the green Deployment to match blue's replica count, then update the Service selector.
   • DDelete the blue Deployment, then update the Service selector to 'web-green'.
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5. 14foundation · easy

   Which Kubernetes primitive is used to expose a set of pods and provide a stable network endpoint for traffic routing?

   • ASecret
   • BDeployment
   • CConfigMap
   • DService
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6. 15application · medium

   A team is performing a blue/green deployment. They have created the green Deployment (v2) and want to switch the Service selector to v2. However, they want to ensure that v2 pods are actually ready to serve traffic before switching. What should they configure on the v2 Deployment to guarantee this?

   • AA liveness probe that restarts the container if it becomes unhealthy.
   • BA readiness probe that checks the application's health endpoint, and only switch the Service selector after all v2 pods report Ready.
   • CA startup probe with a high failure threshold to give the application time to initialize.
   • DSet the v2 Deployment's replicas to 0 and manually scale up after switching the Service.
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