Best approach for Docker resilience with two hosts (lemmy.nz)

submitted 1 year ago by Sim@lemmy.nz to c/selfhosted@lemmy.world

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I'm running Docker on Ubuntu server; around 50 containers running, most admin via Portainer. Configuration files and small databases for container applications are stored on the local SSD, media and larger files are stored on a NAS.

NAS data and the container folders are backed up.

I have a second identical machine doing nothing. What would you recommend researching to add resilience to this setup? Top priority is quick and easy restoration should the SSD fail - everything else is relatively easy to replace.

I'll create an SSD RAID but I like the idea of a second host.

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[-] peter@feddit.uk 16 points 1 year ago

You can use docker swarm (or a better container orchestrator) to have the containers automatically fail over to the second host

[-] mhzawadi@lemmy.horwood.cloud 11 points 1 year ago

Swarm will also spread the load out over both hosts, but all your data would need to be accessible by both hosts

[-] Sim@lemmy.nz 1 points 1 year ago

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)?

[-] Still@programming.dev 2 points 1 year ago

I think you can run a ceph or glusterfs cluster for sharing files in a cluster

[-] Mio@feddit.nu 2 points 1 year ago

I think 3 nodes are required for that

[-] mhzawadi@lemmy.horwood.cloud 2 points 1 year ago

Yes could sync the 2 hosts data, you also can use both hosts as nginx upstreams.

[-] Sim@lemmy.nz 1 points 1 year ago

Thanks. Can I use my existing, single Docker to start a new swarm, or do I have to start from scratch?

this post was submitted on 24 Sep 2023

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