I am running an eperiments which includes around 20 containers heavily communicating with each other through TCP, grpcs, etc. I use Docker stack command to start the containers on an overlay network. However, I have a feeling that there is a bottleneck in my network limiting the bandwidth as my containers are often not able to reach the others. When I monitor the Swarm, it seems that the containers don't use much of the network. so Is there a limit on Docker Swarm overlay networks' bandwidth? The grafana plots on network usage
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Based on a benchmarking held by Vadim Tkachenko (original post), docker overlay network has shown a very poor performance. Please check ksoftirq of your servers and if there's a high CPU load then using Calico overlay plugin is suggested.
Farzan
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