Machine type

Q: How deeply does Infrastructure as Code, Patterns and Practices: With examples in Python and Terraform cover machine type?

Explains vCPU and memory sizing, provider lookups, IaC parsing, and policy tests, but omits complete provider catalog details.

As explained in Infrastructure as Code, Patterns and Practices: With examples in Python and Terraform

A machine type is a predefined cloud virtual-machine configuration specifying the computational resources allocated to an instance.

A machine type is a predefined virtual-machine shape that allocates a specific ratio of vCPUs and memory to an instance. GCP calls it a machine type; AWS uses instance type, and Azure uses size. section 12.1.1

Machine types turn resource sizing into a controllable infrastructure choice. A server configured with more vCPUs than its workload needs can increase the bill without improving use, so infrastructure-as-code tests can enforce a maximum. section 12.1.1

A practical control workflow is:

Inspect observed vCPU and memory usage to identify a suitable capacity limit. section 12.1.1
Query the provider catalog or API for current vCPU and memory values instead of maintaining a complete local catalog. section 12.1.1

Capacity and cost guardrails

For a production environment capped at 32 vCPUs, a policy test rejects an oversized server after retrieving the selected machine type’s current vCPU count from the GCP API. A separate estimate can price five n2d-standard-16 servers and compare the result with a monthly budget. section 12.1.1 section 12.1.2

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Also explained in

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Terraform in Depth: Infrastructure as Code with Terraform and OpenTofuAn instance type is a cloud virtual-machine specification that determines its available compute, memory, networking, and related capacity.

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Related concepts

virtual machineconfigures · A virtual machine is a software-based environment that emulates or implements an abstract computer system, providing an interface on which an operating system or programs can execute.
database instanceconfigures · A database instance is a distinct running or provisioned database environment with its own managed data, configuration, and allocated resources.

This explainer was generated by Manning's knowledge graph from the text of Infrastructure as Code, Patterns and Practices: With examples in Python and Terraform. The section links point to the parts of the book it draws on.