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Dagger

Dagger — programmable CI/CD engine running pipelines in containers.

DevOpsComplex

Stack Components

EngineDagger 0.x
LanguageGo/Python/TS

Why

Pipelines as code in your language, runs locally and in CI identically, no YAML. Docker is used by 59% of professional developers per the Stack Overflow 2024 survey, and Terraform is used by 65% of organizations for IaC (HashiCorp 2024).

GitOps (ArgoCD, Flux) reduces deployment drift to near-zero by making git the single source of truth.

When

Use for complex CI needing real code. Avoid for simple YAML-based pipelines.

How

1. Install dagger CLI 2. Write pipeline in Go/Python/TS 3. dagger call locally 4. Run in any CI 5. Add environment configuration — cp .env.example .env && edit values 6. Run tests — npm test or pnpm test to verify setup 7. Deploy — git push to trigger CI/CD or manual deploy

Example

func (src *Source) Build() *Container { return dag.Container().From("node:20"). WithMountedDirectory("/src", src.Directory()). WithExec([]string{"npm", "run", "build"}) }

Common Problems

  • ⚠BuildKit cache misses — use WithMountedCache
  • ⚠Module version conflicts — pin dagger version
  • ⚠Configuration drift between environments — use infrastructure-as-code (Terraform/Pulumi) to keep dev/staging/prod identical

Best Practices

  • ✓Use caching for dependencies
  • ✓Compose modules for reusability
  • ✓Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit

FAQ

What is Dagger and what projects is it for?

Dagger — programmable CI/CD engine running pipelines in containers. It pairs layered technologies for end-to-end type safety and out-of-the-box deploys, fitting everything from MVPs to production SaaS.

How do I spin up a working demo with Dagger in 10 minutes?

Two steps: (1) Install dagger CLI; (2) Write pipeline in Go/Python/TS. Get the local dev server running, then wire one real data source to verify the end-to-end loop.

What is the most common pitfall with Dagger and how do I avoid it?

The most common pitfall is: BuildKit cache misses — use WithMountedCache. Avoid it by adding the matching checklist to your PR template and running type-check + lint + unit tests in CI — three gates before merge.

What are the best practices for Dagger?

Best practices for Dagger include: Use caching for dependencies; Compose modules for reusability; Set up health checks and graceful shutdown — handle SIGTERM to drain in-flight requests before exit. The first one — "Use caching for dependencies" — should be set up at project init to avoid costly rework later.

When should I NOT choose Dagger?

Pick something else in three cases: (1) the team has zero experience with the core framework and the deadline is tight (learning-curve risk); (2) it's a pure content/marketing site (Astro is lighter); (3) you need very high throughput (>10k RPS) or strict-consistency microservices (Go/Rust). Dagger shines for mid-to-high complexity full-stack and API work — don't over-engineer simple static pages with it.