Docker Swarm je Docker-ov ugrađeni alat za orkestraciju kontejnera — pretvara grupu Docker hostova u klaster upravljan poznatim Docker naredbama. Jednostavniji je od Kubernetesa, ali manje je moćan; razumijevanje oba pomaže u odabiru odgovarajuće orkestracije za danu situaciju.
Što Docker Swarm pruža
Swarm clusters multiple Docker hosts and orchestrates containers ("services"):
✓ Built into Docker — uses familiar Docker CLI/Compose-like syntax (low learning curve)
✓ SERVICES with replicas; scheduling across nodes; SELF-HEALING (restart failed tasks)
✓ Scaling, ROLLING UPDATES/rollbacks, overlay networking, service discovery, secrets
✓ Load balancing (built-in routing mesh)
docker swarm init
docker service create --replicas 3 --name web -p 80:80 nginx
docker service scale web=5
docker service update --image nginx:1.25 web
