"The Docker daemon - dockerd - is the heart of the container engine. It manages container lifecycle, networking, storage, images, system events, and API communication. While Docker works out of the box after installation, configuring the daemon gives administrators deeper control over performance, security, and remote access. This guide dives into the essential configurations of the Docker daemon on Linux."
"You'll learn how to manage Docker using systemd, debug it in foreground mode, expose secure and insecure sockets, use TLS for encrypted API access, and persist configurations through the daemon.json file. By the end, you'll have a clear understanding of how the Docker daemon works and how to tune it for production. Managing Docker with systemd On most Linux distributions, Docker ships with a systemd unit file."
The Docker daemon (dockerd) manages container lifecycle, networking, storage, images, system events, and API communication. Configuring the daemon enables control over performance, security, and remote access. Systemd unit files commonly manage the Docker service on Linux, allowing standard systemctl operations and unit overrides for custom daemon options. Debugging can be performed by running the daemon in the foreground to capture logs and inspect behaviour. The daemon can expose Unix and TCP sockets, but TCP access requires careful configuration and TLS for encryption and authentication. Persisting settings in daemon.json centralizes configuration and improves reproducibility for production deployments.
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