What is Ansible Galaxy?

Ansible Galaxy is both a public hub for sharing reusable roles and collections, and the ansible-galaxy command-line tool for installing them into a local project.

ansible-galaxy install geerlingguy.nginx
ansible-galaxy collection install community.docker

# requirements.yml
roles:
  - name: geerlingguy.nginx
collections:
  - name: community.docker
    version: ">=3.0.0"

Rather than writing a role for common tasks like installing nginx or PostgreSQL from scratch, teams can pull a well-maintained community role or vendor-published collection from Galaxy and layer their own configuration on top. A requirements.yml file lets a project declare exactly which roles/collections and versions it depends on, so ansible-galaxy install -r requirements.yml can reproducibly set up a fresh environment's dependencies.

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