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Enable embedded DNS server on network connect to a user defined network

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Signed-off-by: Santhosh Manohar <santhosh@docker.com>
This commit is contained in:
Santhosh Manohar 2016-01-17 22:22:08 -08:00
parent 3e6a42bcdb
commit 5f22db217a
1 changed files with 14 additions and 40 deletions
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52
libnetwork/sandbox.go
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@ -322,11 +322,15 @@ func (sb *sandbox) startResolver() {
} }
}() }()
sb.rebuildDNS() err = sb.rebuildDNS()
if err != nil {
log.Errorf("Updating resolv.conf failed for container %s, %q", sb.ContainerID(), err)
return
}
sb.resolver.SetExtServers(sb.extDNS) sb.resolver.SetExtServers(sb.extDNS)
sb.osSbox.InvokeFunc(sb.resolver.SetupFunc()) sb.osSbox.InvokeFunc(sb.resolver.SetupFunc())
if err := sb.resolver.Start(); err != nil { if err = sb.resolver.Start(); err != nil {
log.Errorf("Resolver Setup/Start failed for container %s, %q", sb.ContainerID(), err) log.Errorf("Resolver Setup/Start failed for container %s, %q", sb.ContainerID(), err)
} }
}) })
@ -897,36 +901,21 @@ func (sb *sandbox) updateDNS(ipv6Enabled bool) error {
if err != nil { if err != nil {
return err return err
} }
err = ioutil.WriteFile(sb.config.resolvConfPath, newRC.Content, 0644)
if err != nil {
return err
}
// for atomic updates to these files, use temporary files with os.Rename: // write the new hash in a temp file and rename it to make the update atomic
dir := path.Dir(sb.config.resolvConfPath) dir := path.Dir(sb.config.resolvConfPath)
tmpHashFile, err := ioutil.TempFile(dir, "hash") tmpHashFile, err := ioutil.TempFile(dir, "hash")
if err != nil { if err != nil {
return err return err
} }
tmpResolvFile, err := ioutil.TempFile(dir, "resolv")
if err != nil {
return err
}
// Change the perms to filePerm (0644) since ioutil.TempFile creates it by default as 0600
if err := os.Chmod(tmpResolvFile.Name(), filePerm); err != nil {
return err
}
// write the updates to the temp files
if err = ioutil.WriteFile(tmpHashFile.Name(), []byte(newRC.Hash), filePerm); err != nil { if err = ioutil.WriteFile(tmpHashFile.Name(), []byte(newRC.Hash), filePerm); err != nil {
return err return err
} }
if err = ioutil.WriteFile(tmpResolvFile.Name(), newRC.Content, filePerm); err != nil { return os.Rename(tmpHashFile.Name(), hashFile)
return err
}
// rename the temp files for atomic replace
if err = os.Rename(tmpHashFile.Name(), hashFile); err != nil {
return err
}
return os.Rename(tmpResolvFile.Name(), sb.config.resolvConfPath)
} }
// Embedded DNS server has to be enabled for this sandbox. Rebuild the container's // Embedded DNS server has to be enabled for this sandbox. Rebuild the container's
@ -952,23 +941,8 @@ func (sb *sandbox) rebuildDNS() error {
// Resolver returns the options in the format resolv.conf expects // Resolver returns the options in the format resolv.conf expects
dnsOptionsList = append(dnsOptionsList, sb.resolver.ResolverOptions()...) dnsOptionsList = append(dnsOptionsList, sb.resolver.ResolverOptions()...)
dir := path.Dir(sb.config.resolvConfPath) _, err = resolvconf.Build(sb.config.resolvConfPath, dnsList, dnsSearchList, dnsOptionsList)
tmpResolvFile, err := ioutil.TempFile(dir, "resolv")
if err != nil {
return err return err
}
// Change the perms to filePerm (0644) since ioutil.TempFile creates it by default as 0600
if err := os.Chmod(tmpResolvFile.Name(), filePerm); err != nil {
return err
}
_, err = resolvconf.Build(tmpResolvFile.Name(), dnsList, dnsSearchList, dnsOptionsList)
if err != nil {
return err
}
return os.Rename(tmpResolvFile.Name(), sb.config.resolvConfPath)
} }
// joinLeaveStart waits to ensure there are no joins or leaves in progress and // joinLeaveStart waits to ensure there are no joins or leaves in progress and