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Docker networking on hosts with both a public and a private network

(Ktwalrus) #1

My Docker hosts have two nics: eth0 for the internet and eth1 for networking between Docker hosts.

The private network is very fast and I do not pay for bandwidth. The public network is somewhat slower and I have a limited amount of bandwidth.

How do I best use these two networks so containers may be connected to either network or both networks depending on their needs?

(Dockertiger) #2

Don’t worry.i think you can use them both depend which you need.

(Kylesoskin) #3

I think by default a docker container will have access to both networks that the docker daemon host has access to(should be easy enough to test, start a container, get a shell in it, then try to ping something on each network from inside the container and see what happens). If you want a particular container to only use one of the 2, you have to tell it so on start I believe

(Marko Kirves) #4

I have similar set up on Rackspace.

To allow traffic only from the internal network(s) you can explicitly bind a published port to a specific IP to ensure it’s only accessible from that network.

When you invoke docker run you can use either -p IP:host_port:container_port or -p IP::port to specify the external interface for one particular binding.

Would this help?