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Replies

Guillaume @lours.me · 23/02/2026

🐳 🐙 Docker Compose Tip #31 Not every service needs to talk to every other service! networks: frontend: backend: database: internal: true Isolate by tier for better security. Guide: lours.me/posts/compose-tip-031-network-isolation/ #Docker #Compose #Security #Networking

lours.me

Docker Compose Tip #31: Network isolation between services

Isolate services with custom networks for enhanced security

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Adrien Roches @adrienroches.bsky.social · 24/02/2026

And there is the docs.docker.com/reference/cl... which helps debugging how networks are attached to containers. Although the internal: true is not very clear I find... Does it mean it cannot be attached from another compose project with external: true ?

docs.docker.com

docker compose alpha viz

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Guillaume @lours.me · 24/02/2026

internal: true means the network has no external connectivity It does not make it private to a single Compose project. Another stack can still attach to it using external: true if it references the same Docker network. I’ve updated the blog post for clarity, really appreciate the feedback!

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