Dependency graph

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

Defines the graph and supplies an ordered migration procedure across foundational, compute, orchestration, and application resources.

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

A dependency graph represents infrastructure resources and the dependency relationships among them.

A dependency graph represents infrastructure resources and the relationships that determine how infrastructure-as-code changes are applied. During brownfield migration, reconstructing this graph turns live infrastructure into a reliable source of truth. section 2.2.2

Use dependency order to structure migration:

Migrate accounts, provider isolation, service accounts, networks, subnetworks, routing, and root DNS first. section 2.2.2
Migrate servers, queues, and databases after their supporting infrastructure exists. section 2.2.2
Migrate orchestration platforms and application deployments after the compute layer. section 2.2.2
Leave resources with the fewest dependencies, or those requiring server and database configuration, until later. section 2.2.2

Infrastructure migration

Reverse-engineer the networks supporting a database and server, write those configurations as code, then migrate the server and database resources that depend on them.

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Also explained in

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ASP.NET Core in Action, 3eA dependency graph is a directed graph representing objects or components and the dependencies required to construct or operate them.
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Cloud Observability in ActionA service map is a graphical representation of the services in a distributed system and their communication relationships.
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Natural Language Processing in Action, Second EditionA dependency tree is a tree representation of grammatical relationships in which words depend on other words within a sentence.
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Quarkus in ActionA bean dependency graph is a visual graph representing dependency relationships among managed beans.

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Related concepts

dependency injectionaddressed by · Dependency injection is a software design technique in which a component receives its dependencies from outside rather than creating or locating them internally.
structured extractionused by · Structured extraction is the process of identifying specified information in source content and representing it as organized data in a defined structure.
dependencyuses · A software dependency is a component, resource, or prerequisite on which another software component or operation relies to function or proceed.
waterfall visualizationcontrasts with · A waterfall visualization is a time-aligned display showing the sequence, duration, nesting, and overlap of activities or service executions.

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