Linux containers are really cool these days. I hear people talking about Docker and Kubernetes and Rocket and all these things all the time. And if you have containers, you have to network them together!
A lot of computer topics are explained in an unnecessarily confusing way, but I think networking can be especially hard for developers to read about — I’m reading a page right now that talks about virtual networking layers, overlay networks, payload encapsulation, BGP, control planes, packet fragmentation, TAP, veth, Neutron, data center fabric, anycast, vRouters, tunneling, VRF tables, VXLANs… ugh.
A lot of this stuff is not that hard though! I know that packets have IP addresses and ports on them and it turns out that takes you a pretty long way. So let’s talk about a way that containers could talk to each other.
I’m not going to talk too much about what a container is in
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