Quick Answer
The answer is `entrypoint` and `runtime`. The `runtime` element in app.yaml for App Engine flexible environment declares the language runtime, such as `nodejs`, which ensures the correct base environment is provisioned for your application. The `entrypoint` element then defines the exact command to launch your app, allowing you to chain custom dependency installation and startup scripts—for example, using `entrypoint: npm install && npm start`—which directly addresses the need to install custom dependencies and run initialization logic before the main process begins. On the Google Professional Cloud Developer exam, this tests your understanding of how the flexible environment differs from the standard environment, where `entrypoint` is not configurable; a common trap is confusing `entrypoint` with `runtime` or assuming dependencies are handled automatically. Remember the memory tip: “Runtime picks the stage, entrypoint writes the script”—the runtime sets the language foundation, while the entrypoint orchestrates the custom startup sequence.
This PCD practice question tests your understanding of deploying applications. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer is deploying a Node.js application to App Engine flexible environment. They need to install custom dependencies and run startup scripts. Which two configuration elements should they define in the app.yaml? (Choose two.)
entrypoint
Specifies the command to start the application.
runtime
Specifies the runtime environment (e.g., nodejs12).
env_variables
Why wrong: Environment variables are for configuration, not for custom dependencies or startup scripts.
manual_scaling
Why wrong: Manual scaling is about instance count, not startup configuration.
network
Why wrong: Network configuration is for VPC networking, not startup scripts.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
entrypoint
A is correct because the `entrypoint` element in app.yaml for App Engine flexible environment specifies the command to run your application, allowing you to execute custom startup scripts and install dependencies before the main process starts. This is essential for Node.js apps that require custom build steps or runtime initialization beyond the default `npm start`.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
entrypoint
Why this is correct
Specifies the command to start the application.
Related concept
Read the scenario before looking for a memorised answer.
runtime
Why this is correct
Specifies the runtime environment (e.g., nodejs12).
Related concept
Read the scenario before looking for a memorised answer.
env_variables
Why it's wrong here
Environment variables are for configuration, not for custom dependencies or startup scripts.
manual_scaling
Why it's wrong here
Manual scaling is about instance count, not startup configuration.
network
Why it's wrong here
Network configuration is for VPC networking, not startup scripts.
Common exam traps
Cisco often tests the misconception that `env_variables` or `manual_scaling` can handle startup scripts, but only `entrypoint` (and `runtime` to define the base environment) directly control the command executed at container startup.
Detailed technical explanation
Under the hood, App Engine flexible environment runs your application inside a Docker container based on the specified runtime. The `entrypoint` command is executed as the container's main process (PID 1), so you can chain commands like `npm install && npm run build && node app.js` to handle custom dependencies and startup logic. A subtle behavior: if you omit `entrypoint`, App Engine uses a default command (e.g., `npm start`), which may not include your custom scripts, leading to missing dependencies or initialization failures.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
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FAQ
Deploying applications — This question tests Deploying applications — Read the scenario before looking for a memorised answer..
The correct answer is: entrypoint — A is correct because the `entrypoint` element in app.yaml for App Engine flexible environment specifies the command to run your application, allowing you to execute custom startup scripts and install dependencies before the main process starts. This is essential for Node.js apps that require custom build steps or runtime initialization beyond the default `npm start`.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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