SRE Automation Tools & Infrastructure as Code 4

Question 1

What does 'immutable infrastructure' mean in SRE practice?

Accepted Answer

Servers are replaced rather than updated when changes are needed

Answer

Immutable infrastructure means that once deployed, servers are never modified in place; instead they are replaced with new instances containing the updates.

Question 2

Which Terraform resource type allows you to run arbitrary scripts during provisioning?

Accepted Answer

null_resource with provisioner

Answer

A `null_resource` with a `provisioner` block (local-exec or remote-exec) allows running arbitrary scripts as part of Terraform provisioning.

Question 3

In Ansible, what is the difference between a 'task' and a 'role'?

Accepted Answer

A role is a reusable collection of tasks, variables, and handlers organized in a standard structure

Answer

An Ansible role packages related tasks, handlers, variables, and files into a reusable, shareable unit with a standardized directory structure.

Question 4

What problem does remote Terraform state storage (e.g., S3 + DynamoDB) solve?

Accepted Answer

It enables team collaboration and prevents concurrent state modifications

Answer

Remote state storage enables multiple team members to share state and uses locking (e.g., DynamoDB) to prevent simultaneous conflicting changes.

Question 5

Which testing approach validates that Terraform modules produce the expected infrastructure?

Accepted Answer

Integration testing with tools like Terratest

Answer

Terratest is a Go library that enables integration testing of Terraform modules by actually deploying infrastructure and validating its behavior.

(SRE) Site Reliability Engineering Foundation Certification Practice Test

(SRE) Site Reliability Engineering Foundation Certification Practice Test

SRE Automation Tools & Infrastructure as Code 4