Scripting with gcloud in GCP - Step-by-Step Execution

Process Flow - Scripting with gcloud

Write gcloud commands in script

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Run script in terminal

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gcloud CLI processes commands

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Commands execute on GCP services

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Output shown in terminal

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Script ends or loops for next command

This flow shows how a script with gcloud commands is written, run, and executed step-by-step to interact with Google Cloud services.

Execution Sample

GCP

gcloud config set project my-project

gcloud compute instances list

gcloud compute instances create my-vm --zone=us-central1-a

This script sets the active project, lists compute instances, then creates a new VM instance.

Process Table

Step	Command	Action	Result	Output
1	gcloud config set project my-project	Set active project	Project set to my-project	Updated property [core/project].
2	gcloud compute instances list	List VM instances	Retrieved list of instances	No instances found.
3	gcloud compute instances create my-vm --zone=us-central1-a	Create VM instance	Instance creation started	Created [https://www.googleapis.com/compute/v1/projects/my-project/zones/us-central1-a/instances/my-vm].
4	End of script	Script finishes	All commands executed	Script execution complete.

💡 All commands executed successfully; script ends.

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
ACTIVE_PROJECT	none	my-project	my-project	my-project	my-project
INSTANCE_LIST	empty	empty	empty	empty	empty
INSTANCE_CREATED	false	false	false	true	true

Key Moments - 2 Insights

Why does the instance list show 'No instances found' even after setting the project?

Because the project was just set and no VM instances exist yet, as shown in step 2 of the execution_table.

What happens if the project is not set before running compute commands?

gcloud commands will fail or use a default project, causing errors or unexpected results. Setting the project first (step 1) avoids this.

Visual Quiz - 3 Questions

Look at the execution table, what is the output after running 'gcloud compute instances list'?

A Project set to my-project.

B Instance created successfully.

C No instances found.

D Error: project not set.

💡 Hint

Check row 2, Output column in the execution_table.

At which step does the script create a new VM instance?

A Step 3

B Step 2

C Step 1

D Step 4

💡 Hint

Look at the Command column and Action column in the execution_table.

If the project was not set in step 1, how would the output of step 3 likely change?

A Instance creation would succeed as normal.

B An error about missing project would occur.

C The instance list would show existing instances.

D The script would skip instance creation.

💡 Hint

Consider the importance of setting ACTIVE_PROJECT in variable_tracker and step 1 in execution_table.

Concept Snapshot

Scripting with gcloud:
- Write gcloud commands in a script file.
- Run script in terminal to execute commands sequentially.
- Set project first to avoid errors.
- Commands interact with GCP services and show output.
- Script ends after all commands run.

Full Transcript

This visual execution trace shows how scripting with gcloud works. First, you write commands like setting the project, listing instances, and creating a VM. When you run the script, each command executes in order. The project must be set first to ensure commands run in the right context. The output after each command shows success or results, such as no instances found or instance creation confirmation. Variables like ACTIVE_PROJECT and INSTANCE_CREATED track the script's state. This helps beginners see how gcloud commands run step-by-step in a script.