"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. 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. Systemd unit files on most Linux distributions enable standard systemctl management and service supervision. Dockerd can run in foreground mode for interactive debugging and emit detailed logs. The daemon can listen on Unix domain sockets and TCP sockets; TCP sockets should be secured with TLS and certificate verification to protect the API. Persistent configuration belongs in /etc/docker/daemon.json using JSON keys to set defaults such as log-driver, storage-driver, and insecure-registries. Best practices include restricting remote access, enabling TLS mutual authentication, and using systemd to control restarts and resource limits.
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