What happens to the main containers in a Pod if an init container fails?

The Pod is deleted and recreated immediately.

The main containers do not start until the init container succeeds.

The main containers start anyway after a delay.

The main containers start but the init container is ignored.

A Pod runs a legacy application that listens on a fixed port and cannot be configured to use a different port. A new security policy requires the application to be reachable only through a proxy that adds authentication. The team cannot modify the application. What should they do?

Add an ambassador container that listens on a new port, authenticates requests, and proxies them to the legacy application on its fixed port via localhost.

Expose the legacy application directly with a Service and add authentication at the ingress level.

Add a sidecar container that modifies the legacy application's port at runtime.

Add an init container that patches the application's binary to change the port.

Which mechanism allows containers in the same Pod to share files?

A shared volume mounted into each container

A ConfigMap mounted as an environment variable

A Secret mounted into one container only

In a Pod definition, where are init containers declared?

In a separate `initContainers` field in the Pod spec

In the same `containers` list as the main containers

In the `spec.template.spec.init` field of a Deployment

In a ConfigMap that is referenced by the Pod

Certified Kubernetes Application Developer (CKAD)

Domain 1Objective 3

Understand Multi-Container Pod Design Patterns (e.g. Sidecar, Init and Others) CKAD Practice Questions (Page 4)

Part of the Application Design and Build domain, which accounts for 20% of the CKAD exam. Linux Foundation does not publish an official question count, but from its 120-minute exam (~50–80 total, ~10–16 in this domain), expect 3–4 from this objective — we provide 21 practice questions to prepare you well beyond it. (estimate)

21questions here

5free pages

5concepts

20%of the exam

Questions 16–20

16foundation · easy
What happens to the main containers in a Pod if an init container fails?
Select an answer first
17expert · hard
A Pod runs a legacy application that listens on a fixed port and cannot be configured to use a different port. A new security policy requires the application to be reachable only through a proxy that adds authentication. The team cannot modify the application. What should they do?
Select an answer first
18foundation · easy
Which mechanism allows containers in the same Pod to share files?
Select an answer first
19foundation · easy
In a Pod definition, where are init containers declared?
Select an answer first
20foundation · easy
Which multi-container Pod pattern is used to run a setup task that must complete successfully before the main application containers are started?
Select an answer first

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