Swarm Service Types

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Replicated Service

docker service create \
  --name web \
  --replicas 5 \
  nginx:latest

docker service inspect web \
  --format '{{json .Spec.Mode}}'

{"Replicated":{"Replicas":5}}

• Tasks are spread evenly across available nodes.
• Scale up or down by updating --replicas.
• Ideal for stateless applications like web servers or APIs.

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Global Service

docker service create \
  --name agent \
  --mode global \
  my-monitoring-agent:1.0

• New nodes automatically receive one task.
• When a node leaves, its task is removed and not rescheduled.
• Perfect for logging, monitoring, and security daemons.

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Comparison Table

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References

• Docker Swarm Overview
• docker service create
• docker service inspect
• Docker Blog: Introduction to Swarm Mode