Docker Architecture: The components and processes - Part 2

Part two of the Docker Architecture series examines how to secure and monitor Docker environments, emphasizing protection of the Docker Daemon, container isolation, and operational visibility. Recommended security practices include running the daemon in rootless mode where appropriate, using TLS and mutual TLS to encrypt and authenticate CLI-to-daemon communications, enabling user namespace remapping so container root users map to unprivileged host users, relying on trusted images, limiting CPU and memory resources, using read-only filesystems, and restricting Linux capabilities and privilege escalation. The discussion also covers accessing daemon and container logs, diagnosing startup, image-pull, networking, resource, and disk-space problems, and configuring log rotation to control storage use. For observability, it outlines a monitoring stack based on cAdvisor, Prometheus, Grafana, and OpenTelemetry, enabling metric collection, visualization, proactive troubleshooting, and performance management of containerized applications.

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