Scripting with gcloud in GCP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of using gcloud in scripts?

gcloud is a command-line tool to manage Google Cloud resources. In scripts, it automates tasks like creating, updating, or deleting resources without manual clicks.

beginner

How do you authenticate a script to use gcloud commands?

You use gcloud auth login for user authentication or gcloud auth activate-service-account --key-file=KEY.json to authenticate with a service account key file for scripts.

beginner

What does the --quiet flag do in gcloud scripts?

The --quiet flag disables all interactive prompts, making scripts run without waiting for user input.

intermediate

Why is it important to check the exit status of gcloud commands in scripts?

Checking exit status helps detect if a command succeeded or failed, so the script can handle errors or stop to avoid unwanted actions.

intermediate

How can you capture the output of a gcloud command in a script?

You can capture output by assigning it to a variable using command substitution, for example: output=$(gcloud compute instances list --format=json).

Which command authenticates a service account for scripting with gcloud?

A gcloud auth activate-service-account --key-file=KEY.json

B gcloud auth login

C gcloud config set project PROJECT_ID

D gcloud init

Option A activates a service account using a key file, suitable for scripts. Option B is for user login, which is interactive.

What does the --quiet flag do when added to a gcloud command in a script?

A Skips authentication

B Shows detailed logs

C Runs the command without any interactive prompts

D Runs the command in debug mode

The --quiet flag disables prompts, allowing scripts to run without waiting for user input.

How can you handle errors in a script using gcloud commands?

A Ignore errors and continue

B Check the exit status after each command

C Use <code>gcloud error-check</code> command

D Restart the script automatically

Checking the exit status (e.g., $? in bash) helps detect failures and handle them properly.

Which format option helps get machine-readable output from gcloud commands?

A --format=json

B --verbose

C --quiet

D --interactive

The --format=json flag outputs data in JSON, easy to parse in scripts.

What is a good practice when writing scripts with gcloud commands?

A Always use interactive mode

B Run commands without authentication

C Ignore command outputs

D Use service account authentication and check command results

Using service accounts and checking results ensures scripts run securely and reliably.

Explain how to authenticate and run a gcloud command in a script without user interaction.

Think about how scripts avoid prompts and authenticate automatically.

Describe how to capture and use the output of a gcloud command inside a script.

Consider how shell scripts store command results.