main.go

// Compile with:
//   GOOS=linux go build -a --ldflags '-extldflags "-static"' -tags netgo -installsuffix netgo -o dns-example main.go
//
// Run on Kubernetes. Example resolv.conf
//
// # /etc/reslov.conf
// search default.svc.cluster.local svc.cluster.local cluster.local google.internal c.hightowerlabs.internal
// nameserver 10.179.240.10
// options ndots:5
//
// Results in the following error:
//   $ curl -O https://storage.googleapis.com/hightowerlabs/dns-example
//   $ chmod +x dns-example
//   $ ./dns-example 
//   2016/10/25 16:11:46 lookup kubernetes.default.svc.cluster.local: unrecognized address
//
// But this works:
//   $ dig +short kubernetes.default.svc.cluster.local
//   10.179.240.1
//
// While dig works it does not respect resolv.conf or the search domain list. So this does not work
//   $ dig kubernetes

package main

import (
    "log"
    "fmt"
    "net"
)

func main() {
    ips, err := net.LookupAddr("kubernetes.default.svc.cluster.local")
    if err != nil {
        log.Fatal(err)
    }
    for _, ip := range ips {
        fmt.Println(ip)
    }
}

We followed the lead of skydns and others. The fact that only the Go resolver does this says that, while it may be technically right, it is wrong.

Also: dig +search is your friend

Looks like this is working as desired with the following code update:

package main

import (
    "log"
    "fmt"
    "net"
)

func main() {
    ips, err := net.LookupHost("kubernetes")
    if err != nil {
        log.Fatal(err)
    }
    for _, ip := range ips {
        fmt.Println(ip)
    }
}

Need to use LookupHost not LookupAddr

This may have been fixed in 1.7.x

Fixed in 1.7.1 with this: https://go-review.googlesource.com/#/c/27250/