"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."
"On most Linux distributions, Docker ships with a systemd unit file. This makes it easy to manage the Docker Engine using standard systemctl..."
The Docker daemon (dockerd) manages container lifecycle, networking, storage, images, system events, and API communication. Manage dockerd with the provided systemd unit file to use standard systemctl controls and service management. Run dockerd in foreground mode to enable interactive debugging and capture logs directly. Configure sockets to expose local Unix sockets or TCP sockets for remote access, distinguishing between secure and insecure endpoints. Protect remote API access with TLS certificates and key files to encrypt communications and authenticate clients. Persist runtime options and best-practice settings in /etc/docker/daemon.json for reproducible, maintainable configurations. Restrict remote exposure, minimize privileges, and enable logging and monitoring for production use.
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