Revert "Merge pull request #6365 from heyitsanthony/fix-dns-bind"

This reverts commit af5ab7b3515cf023af7af94bc6e9063945802be0, reversing
changes made to da6a0f0594f352539349013336614e08033a7eb3.

embed/config.go

@@ -17,7 +17,6 @@ package embed
 import (
 	"fmt"
 	"io/ioutil"
-	"net"
 	"net/http"
 	"net/url"
 	"strings"
@@ -254,13 +253,6 @@ func (cfg *configYAML) configFromFile(path string) error {
 }
 
 func (cfg *Config) Validate() error {
-	if err := checkBindURLs(cfg.LPUrls); err != nil {
-		return err
-	}
-	if err := checkBindURLs(cfg.LCUrls); err != nil {
-		return err
-	}
-
 	// Check if conflicting flags are passed.
 	nSet := 0
 	for _, v := range []bool{cfg.Durl != "", cfg.InitialCluster != "", cfg.DNSCluster != ""} {
@@ -354,22 +346,3 @@ func (cfg Config) IsDefaultHost() (string, error) {
 	}
 	return "", defaultHostStatus
 }
-
-// checkBindURLs returns an error if any URL uses a domain name.
-func checkBindURLs(urls []url.URL) error {
-	for _, url := range urls {
-		if url.Scheme == "unix" || url.Scheme == "unixs" {
-			continue
-		}
-		host := strings.Split(url.Host, ":")[0]
-		if host == "localhost" {
-			// special case for local address
-			// TODO: support /etc/hosts ?
-			continue
-		}
-		if net.ParseIP(host) == nil {
-			return fmt.Errorf("expected IP in URL for binding (%s)", url.String())
-		}
-	}
-	return nil
-}

integration/embed_test.go

@@ -40,8 +40,6 @@ func TestEmbedEtcd(t *testing.T) {
 		{wpeers: 1, wclients: 1},
 		{wpeers: 2, wclients: 1},
 		{wpeers: 1, wclients: 2},
-		{werr: "expected IP"},
-		{werr: "expected IP"},
 	}
 
 	urls := newEmbedURLs(10)
@@ -60,10 +58,6 @@ func TestEmbedEtcd(t *testing.T) {
 	setupEmbedCfg(&tests[5].cfg, []url.URL{urls[4]}, []url.URL{urls[5], urls[6]})
 	setupEmbedCfg(&tests[6].cfg, []url.URL{urls[7], urls[8]}, []url.URL{urls[9]})
 
-	dnsURL, _ := url.Parse("http://whatever.test:12345")
-	tests[7].cfg.LCUrls = []url.URL{*dnsURL}
-	tests[8].cfg.LPUrls = []url.URL{*dnsURL}
-
 	dir := path.Join(os.TempDir(), fmt.Sprintf("embed-etcd"))
 	os.RemoveAll(dir)
 	defer os.RemoveAll(dir)