https://lukehebert.com/tag/docker/Recent content in Docker on Luke HebertHugoen-usTue, 19 Aug 2025 00:00:00 +0000https://lukehebert.com/post/network-namespaces-virtual-network/Tue, 19 Aug 2025 00:00:00 +0000https://lukehebert.com/post/network-namespaces-virtual-network/Network namespaces provide the foundation for container network isolation in Docker and Kubernetes. This guide covers listing, creating, and linking namespaces, bridging, NAT, and how Docker and Kubernetes build on these primitives.https://lukehebert.com/post/docker-and-container-capabilities/Sat, 16 Aug 2025 00:00:00 +0000https://lukehebert.com/post/docker-and-container-capabilities/An in-depth overview of Linux capabilities and how they govern privilege inside Docker containers and Kubernetes pods. Covers capability sets, file capabilities, bounding sets, securebits, and user-namespace interactions.https://lukehebert.com/post/how-to-inspect-a-thread-dump-like-a-pro/Fri, 15 Aug 2025 00:00:00 +0000https://lukehebert.com/post/how-to-inspect-a-thread-dump-like-a-pro/Learn how to capture, read, and interpret Java thread dumps using JDK tools like jstack and jcmd. Covers thread states, CPU analysis, deadlock detection, and practical tools for spotting performance issues.https://lukehebert.com/post/an-introductory-how-to-of-docker-exec/Thu, 29 May 2025 00:00:00 +0000https://lukehebert.com/post/an-introductory-how-to-of-docker-exec/A practical guide to the docker exec command, covering background execution, environment variables, interactive sessions, and working directory control. Includes real-world examples to help you get the most out of running commands inside containers.https://lukehebert.com/post/docker-kubernetes-network-diagnostic-tools/Mon, 26 Aug 2024 00:00:00 +0000https://lukehebert.com/post/docker-kubernetes-network-diagnostic-tools/A practical guide to using the netshoot container for Docker and Kubernetes network troubleshooting. Covers network namespaces, tcpdump examples, and real-world diagnostic workflows.https://lukehebert.com/post/understanding-docker-dns/Wed, 15 Nov 2023 00:00:00 +0000https://lukehebert.com/post/understanding-docker-dns/An overview of how Docker’s built-in DNS resolver enables container-to-container communication and service discovery. Covers default configurations, custom DNS setups, and practical use cases.https://lukehebert.com/post/how-to-change-docker-root-data-directory/Fri, 02 Jun 2023 00:00:00 +0000https://lukehebert.com/post/how-to-change-docker-root-data-directory/A step-by-step guide to relocating the Docker data directory to a new path. Covers daemon configuration, data migration, and cleanup for both older and newer Docker versions.https://lukehebert.com/post/docker-determining-container-responsible-for-largest-overlay-directories/Thu, 18 May 2023 00:00:00 +0000https://lukehebert.com/post/docker-determining-container-responsible-for-largest-overlay-directories/A practical guide to identifying which Docker containers occupy the largest overlay2 directories. Uses docker inspect, jq, and xargs to map cryptic layer hashes back to human-readable container names.