Everything about Docker’s overlay2 storage driver — how overlay layers work, tracking disk usage by layer, recovering space from dangling layers, and performance tuning on ZFS-backed Proxmox hosts. Real commands, real output.
A practical guide to Docker healthchecks in Compose — define checks with test, interval, timeout, and start_period, use depends_on condition: service_healthy for ordered startup, and debug health state with docker inspect.
A practical guide to diagnosing and fixing Docker container networking problems — DNS timeouts, port conflicts, bridge network isolation, cross-host communication, and the netshoot toolkit for homelab deployments.