I’m configuring a cluster with Docker Swarm and at the same time I’m finishing a Swarm online bootcamp. Right now the professor is explaining network generalities and stuff, and one thing got my attention. He says default
ingress network is a special purpose network only meant for incomming traffic, it’s not meant for traffic between containers. And according to a GitHub issue:
This network exists to serve one purpose only, to facilitate routing such requests. Even though it shows up in network listings it should not be used as a normal network to discover services which are attached to them or facilitate internal load balancing between these services.
At the same time he suggest creating an overlay network with a specific
subnet. He says I don’t have to specify a
subnet per se. One thing he caution to avoid is using a
subnet that is on an existing network within my organization in order to avoid conflicts with routing and communication.
So, having all that in mind, how do I know which
subnet to configure? Is it a good practice to not specify it and let Docker Swarm to put it for me? Also, my host provider gives me a private network automatically, so I have to create my
overlay network with a
subnet inside that range?
Huge thanks in advance.