SingleA_Linux_Lab2/LAB_GUIDE.txt at main · solnarcisse/SingleA_Linux_Lab2 · GitHub

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Simple Linux Lab: Updating Mock Client Certificates

Objective
Find every file named client_key.txt in the simulated server environment and update it so that its contents match the new mock client key.

What you are given
1. A starter script that creates a fake server environment.
2. A teardown script that removes the environment.
3. A checker script that verifies whether the certificate files were updated.
4. A file named new_client_key.txt that contains the replacement key.

Success condition
The checker script looks for this unique sequence inside each updated client_key.txt file:

A1B2C3D4E5

That sequence exists in the new key but does not exist in the old key.

High-level workflow
1. Run the starter script for your platform.
2. Enter the generated lab directory.
3. Use Linux commands to find every client_key.txt file.
4. Replace the old key in each one with the contents of new_client_key.txt.
5. Run the checker script.
6. When finished, run the teardown script.

Suggested commands students can practice
- pwd
- ls
- cd
- find
- cat
- cp
- grep
- xargs
- echo

Example lab tasks
Task 1:
Run the starter script and verify that the environment was created.

Task 2:
List the top-level department/service directories.

Task 3:
Use find to locate every client_key.txt file.

Task 4:
Open one old certificate file with cat and compare it with new_client_key.txt.

Task 5:
Update one certificate manually with cp.

Task 6:
Update the rest using find with -exec or xargs.

Task 7:
Run the checker script and confirm all certificate files contain the new value.

Task 8:
Explore the extra nested folders and files that simulate a live server.

Task 9:
Re-run the checker after intentionally breaking one file, then fix it.

Task 10:
Run the teardown script to remove the environment.

Expected certificate count
10 total client_key.txt files

Top-level directories created
- finance-payments / payment-api
- hr-portal / employee-web
- sales-crm / crm-sync
- engineering-build / ci-runner
- marketing-site / cms-publisher
- operations-monitoring / ops-agent
- security-auth / sso-gateway
- support-ticketing / ticket-worker
- analytics-reporting / etl-engine
- legal-docs / document-store