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cleanup resolve.conf code

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Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
This commit is contained in:
Jessica Frazelle 2014-10-07 17:58:39 -07:00
parent acd511786e
commit dbe6c6651e
2 changed files with 39 additions and 19 deletions
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19
daemon/container.go
View file

@ -920,6 +920,7 @@ func (container *Container) setupContainerDns() error {
}
if config.NetworkMode != "host" {
// check configurations for any container/daemon dns settings
if len(config.Dns) > 0 || len(daemon.config.Dns) > 0 || len(config.DnsSearch) > 0 || len(daemon.config.DnsSearch) > 0 {
var (
dns = resolvconf.GetNameservers(resolvConf)
@ -936,15 +937,15 @@ func (container *Container) setupContainerDns() error {
dnsSearch = daemon.config.DnsSearch
}
return resolvconf.Build(container.ResolvConfPath, dns, dnsSearch)
} else {
resolvConf = utils.RemoveLocalDns(resolvConf)
if !bytes.Contains(resolvConf, []byte("nameserver")) {
for _, dns := range DefaultDns {
log.Infof("No non localhost DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v", DefaultDns)
resolvConf = append(append(resolvConf, []byte("\nnameserver ")...), dns...)
}
resolvConf = append(resolvConf, []byte("\n")...)
}
}
// replace any localhost/127.* nameservers
resolvConf = utils.RemoveLocalDns(resolvConf)
// if the resulting resolvConf is empty, use DefaultDns
if !bytes.Contains(resolvConf, []byte("nameserver")) {
log.Infof("No non localhost DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v", DefaultDns)
// prefix the default dns options with nameserver
resolvConf = append(resolvConf, []byte("\nnameserver "+strings.Join(DefaultDns, "\nnameserver "))...)
}
}
return ioutil.WriteFile(container.ResolvConfPath, resolvConf, 0644)

39
integration-cli/docker_cli_run_test.go
View file

@ -1266,20 +1266,39 @@ func TestRunWithVolumesIsRecursive(t *testing.T) {
}
func TestRunDnsDefaultOptions(t *testing.T) {
cmd := exec.Command(dockerBinary, "run", "busybox", "cat", "/etc/resolv.conf")
actual, _, err := runCommandWithOutput(cmd)
if err != nil {
t.Fatal(err, actual)
}
resolvConf, err := ioutil.ReadFile("/etc/resolv.conf")
// ci server has default resolv.conf
// so rewrite it for the test
origResolvConf, err := ioutil.ReadFile("/etc/resolv.conf")
if os.IsNotExist(err) {
t.Fatalf("/etc/resolv.conf does not exist")
}
if actual != string(resolvConf) {
t.Fatalf("expected resolv.conf is not the same of actual")
// test with file
tmpResolvConf := []byte("nameserver 127.0.0.1")
if err := ioutil.WriteFile("/etc/resolv.conf", tmpResolvConf, 0644); err != nil {
t.Fatal(err)
}
// put the old resolvconf back
defer func() {
if err := ioutil.WriteFile("/etc/resolv.conf", origResolvConf, 0644); err != nil {
t.Fatal(err)
}
}()
cmd := exec.Command(dockerBinary, "run", "busybox", "cat", "/etc/resolv.conf")
actual, _, err := runCommandWithOutput(cmd)
if err != nil {
t.Error(err, actual)
return
}
// check that the actual defaults are there
// if we ever change the defaults from google dns, this will break
expected := "\nnameserver 8.8.8.8\nnameserver 8.8.4.4"
if actual != expected {
t.Errorf("expected resolv.conf be: %q, but was: %q", expected, actual)
return
}
deleteAllContainers()