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You can use docker swarm (or a better container orchestrator) to have the containers automatically fail over to the second host
Swarm will also spread the load out over both hosts, but all your data would need to be accessible by both hosts
Thanks. That means I need to move all data off the hosts on to, say, a NAS - then the NAS becomes the single point of failure. Can I operate a swarm without doing that but still duplicate everything from host 1 to host 2, so host 2 could take over relatively seamlessly (apart from local DNS and moving port forwarding to nginx on the remaining host)?
Yes could sync the 2 hosts data, you also can use both hosts as nginx upstreams.
I think you can run a ceph or glusterfs cluster for sharing files in a cluster
I think 3 nodes are required for that
Thanks. Can I use my existing, single Docker to start a new swarm, or do I have to start from scratch?