Understand Multi-Container Pod Design Patterns (e.g. Sidecar, Init and Others) CKAD Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A Pod runs a web application that needs to send metrics to a monitoring system. The application does not support the monitoring system's protocol. The team wants to add this capability without changing the application. What should they do?

   • AAdd an adapter container that replaces the application's metrics endpoint.
   • BAdd an init container that sends metrics before the application starts.
   • CAdd an ambassador container that proxies the application's network traffic to the monitoring system.
   • DAdd a sidecar container that scrapes metrics from the application's endpoint and forwards them in the required protocol.
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2. 12expert · hard

   A Pod has an init container that provisions a certificate, a main application that serves HTTPS, and a sidecar that reloads the certificate when it rotates. The sidecar must not start reloading until the certificate is provisioned. The init container writes the certificate to a shared volume. What should they configure?

   • AA readinessProbe on the main application that checks for the certificate file.
   • BA livenessProbe on the sidecar that checks for the certificate file.
   • CA startupProbe on the sidecar that checks for the certificate file in the shared volume.
   • DAn additional init container that waits for the sidecar to be ready.
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4. 13application · medium

   A team runs a Node.js web application in a single-container Pod. They need to add TLS termination and request logging without modifying the application code. The solution must share the same network namespace as the application and must not introduce a separate Service. What should they do?

   • AAdd an init container that runs nginx and then exits, leaving the TLS termination to the main container.
   • BAdd an nginx sidecar container to the Pod that listens on port 443 and proxies to the application on localhost:8080.
   • CDeploy nginx as a separate Deployment and expose it with a ClusterIP Service pointing to the Node.js Pod.
   • DModify the Node.js application to include TLS termination and request logging directly.
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5. 14foundation · easy

   What is the primary purpose of an init container in a Kubernetes Pod?

   • ATo perform setup or initialization tasks before the main containers start
   • BTo expose the main container's service to external traffic
   • CTo run a long-lived process that supports the main container
   • DTo provide a backup container that starts if the main container crashes
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6. 15application · medium

   A Pod has a main application that reads configuration from /etc/config and a sidecar that watches for config changes and reloads the application. The configuration is stored in a ConfigMap. What should they configure?

   • ACopy the ConfigMap contents into an emptyDir volume and mount that in both containers.
   • BMount the ConfigMap only in the main container and have the sidecar read it via localhost.
   • CMount the ConfigMap as a volume in both containers at /etc/config.
   • DUse environment variables instead of a volume for the configuration.
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