Tag: containers

PID 1 in a container ignores signals, so Ctrl+C does nothing and stops take 10 seconds. Fix it with exec form CMD or tini, ranked best to worst approach.

daemon.json controls how the Docker daemon behaves, logging drivers, storage drivers, registry mirrors, and the options worth tuning.

Bridge, host, overlay, macvlan, and none, every Docker network mode explained with real use cases from beginner to production.

The -v and --mount flags for Docker volumes explained, bind mounts vs named volumes, read-only, propagation, and tmpfs options.

Move Docker images between hosts without a registry using docker save and docker load, air-gapped deployments made simple.

CMD and ENTRYPOINT both define what runs in a container but work differently, exec vs shell form, and how they interact when combined.

Use docker cp to move files between running containers and your host machine, no volumes needed for one-off file transfers.

COPY and ADD look similar but ADD auto-extracts tarballs and fetches URLs, know when each is appropriate and why COPY is usually better.

Add load balancing and failover to your Docker setup using Swarm, nginx, HAProxy, and Keepalived, high availability without Kubernetes.

Access services on the host machine from inside a Docker container using host-gateway or host.docker.internal, no hardcoded IPs.

Containers share the kernel; VMs have their own. Understand the isolation trade-offs, overhead differences, and when to use which.

Run multiple commands in one docker exec call by piping a heredoc to the container shell, chain dependent steps and skip repeated container roundtrips.