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System Design
ByteByteGo·24d ago·5 min read
EP221: How Docker Works Under the Hood
TL;DR
Docker containers are initiated through a command that is processed by the Docker daemon, which transforms it into a running Linux process. This process involves the Docker CLI sending an API call to the daemon, which manages the container lifecycle.
✦ Why It Matters
Engineers can optimize their Docker workflows by understanding the interaction between the CLI and the Docker daemon.
Key Takeaways
- Understand the role of Docker CLI in container management.
- Check if your required Docker images are available locally.
- Utilize containerd for efficient lifecycle management.
- Leverage Linux namespaces for process isolation.
How It Works
Docker begins with a command from the CLI, which communicates with the Docker daemon. The daemon checks for the image and pulls it if necessary.
It then delegates to containerd, which prepares the runtime environment. Finally, runc sets up the Linux namespaces and starts the container process, ensuring isolation and resource control.