Add support to pull data from multiple docker endpoints (e.g. swarm) #548
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This PR adds support to request container data from multiple docker endpoints. For example in swarm you now can get containers information from all nodes at once.
Main idea is that
endpoint
parameter refers to local docker node for which docker-gen generates configs. And theswarm-node
parameters define additional docker nodes from which docker-gen pulls containers information.Back compatability preserved. If no
swarm-node
stated then docker-gen collects information only from local docker endpoint defined byendpoint
parameter.In case when stated at least one
swarm-node
parameter docker-gen will collect containers information from swarm-node list. And useendpoint
only for "controlling" purpose (e.g. to notify containers).Root use-case for this PR is to make possible for projects like nginx-proxy to have full information across all swarm cluster.