Question 1

How do I set up SkyDNS with Docker?

Accepted Answer

SkyDNS provides official Docker images on Docker Hub, and the README includes a Docker section. Run it with host networking to access etcd on the host, and ensure etcd is configured first, as it's a dependency.

Question 2

SkyDNS vs Consul for service discovery?

Accepted Answer

SkyDNS is best for etcd-based environments and uses DNS for discovery, while Consul offers more features like health checks, KV store, and multi-datacenter support. Choose SkyDNS if you're already using etcd and prefer a lightweight DNS approach.

Question 3

Can SkyDNS work without etcd?

Accepted Answer

No, SkyDNS is tightly coupled with etcd as its backend. The README states it translates etcd keys into DNS records, so etcd is mandatory for service registration and discovery.

Question 4

How do I register a service in SkyDNS?

Accepted Answer

Register services by submitting JSON over HTTP to etcd under specific paths. For example, use curl to PUT a JSON value with fields like host and port to etcd, as detailed in the 'Service Announcements' section of the README.

Question 5

Does SkyDNS support load balancing?

Accepted Answer

SkyDNS supports basic round-robin sorting for A and AAAA responses by default, but it's limited. For advanced load balancing, you may need to use SRV record weights or additional layers, as hinted in the 'How Do I Create an Address Pool' section.

Question 6

What are the performance implications of SkyDNS?

Accepted Answer

SkyDNS adds a DNS layer, which can introduce latency compared to direct API calls, but it benefits from DNS caching. The README doesn't provide benchmarks, so performance should be tested in your specific environment.

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