20 lines
1020 B
Markdown
20 lines
1020 B
Markdown
## Prerequisites
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* Port `2377` and `2378` must be open
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* Docker v1.12.1 installed
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SwarmKit's overlay network configuration must determine which interface will be used for cross-host communication. By default, Rancher routes traffic over public IP addresses. Swarm can't always detect the corresponding interface; you may need to do one of the following:
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* Register hosts with CATTLE_AGENT_IP environment variable set to a system address
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* Specify the host interface for Swarm to listen on (hosts must have the same interface name)
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## Features
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* Automatically scale up/down a Swarm by adding/removing hosts to an environment
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* Do not attempt to run `docker swarm` commands manually
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* Configurable number of managers tunable to desired [failure tolerance](https://docs.docker.com/engine/swarm/admin_guide/#/add-manager-nodes-for-fault-tolerance)
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* Reconciliation logic promotes/demotes managers/workers to maintain resilience
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## Limitations
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* Swarm over public networks is not supported in Docker 1.12.3 and older |