description Docker Swarm Overview
Docker Swarm is an orchestration tool built into the Docker Engine that allows users to manage and scale containerized applications across a cluster of machines, providing features like service discovery and rolling updates.
help Docker Swarm FAQ
What is Docker Swarm used for?
Docker Swarm is Docker Engine's built-in system for managing containers across multiple machines. It groups those machines into a cluster and schedules replicated services on available nodes.
How does Docker Swarm differ from Kubernetes?
Swarm is built into Docker and is generally simpler to start, while Kubernetes has a larger ecosystem and more complex operational model. Both can provide service scheduling, networking, and rolling updates.
What is a Swarm manager node?
A manager maintains cluster state, accepts service changes, and schedules tasks onto worker or manager nodes. Docker Swarm uses Raft consensus among managers, so production clusters normally use an odd number of managers.
Can Docker Swarm perform rolling updates?
Yes, a service can be updated gradually so tasks are replaced according to the configured update policy. This allows a new container image to roll out without stopping every replica at once.
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