Is it possible to have a swarm of two nodes where both are swarm managers? So that you get fault tolerance in a swarm of only two nodes?

the managers would also have to be worked nodes. as worker is where the containers are deployed. but yes… the idea however was to isolate the workers from the managers. workers drive the business application, managers manage the docker infrastructure.

Thanks for the quick answer. The architecture makes sense. But in this case the swarm is only used for development not production. Currently the swarm has one worker and one manager. To get from there to two managers one swarm the worker needs to leave and rejoin via a worker token, is that right…

see this post [image] Will docker swarm 1.12 support multiple managers? Swarm Update: I have found a solution. Apparently when creating a swarm of masters the majority of (n+1)/2 must be present and active for swarm to function. So if there are 2 managers and one goes d…

Also note that, by default, swarm mode master nodes will also run container nodes alongside the worker nodes. To prevent that (so that the swarm masters are only managing the cluster/scheduling duties), you’ll need to log onto a master node and run docker node update --availability drain <NODE> for…

Hi all, moving on this possible architecture. I have two servers (bare metal) and in Docker Cloud I have dockercloud/haproxy as loadbalancer, one instance in each server. For every domain, we use a DNS Round Robin to route traffic to the two servers for the same domain(s). With docker swarm, dock…

You’re correct in that two manager nodes don’t help resiliency of your cluster. You really need at least 3 managers for that. You’ve probably already read this but it provides more details as to why: Administer and maintain a swarm of Docker Engines One option might be to run your swarm cluster …

When one of two manager nodes drop, only consensus is lost. The containers on the surviving node are still operating. You can probably design the desired-state of the services so that some availability can be maintained through a single node loss. When one of two manager nodes drop, consensus is …

Can you create a swarm with two manager nodes only?

Docker Engine Swarm

sdetweil (Sam) January 9, 2018, 2:42pm 4

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Can you create a swarm with two manager nodes only?

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