Docker Networking and DNS: The Good, The Bad, And The Ugly

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Docker SDN (Software Defined Network) already exists for quite some time. What is new, starting from the release 1.11, is the addition of DNS round-robin load balancing. That is both a reason for celebration and an opportunity to explore Docker networking and DNS. We’ll explore internal and external networking, see how DNS fits into the picture, discuss use cases that might be a good fit, and finish with pros and cons.

Let’s start from the beginning. Since I don’t know whether you’re a Mac, Windows, or Linux user, we’ll create a few VMs running Ubuntu and use them to simulate a Docker Swarm cluster.

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