// Embedded DNS server has to be enabled for this sandbox. Rebuild the container's
// resolv.conf by doing the follwing
// - Save the external name servers in resolv.conf in the sandbox
// - Add only the embedded server's IP to container's resolv.conf
// - If the embedded server needs any resolv.conf options add it to the current list
func (sb *sandbox) rebuildDNS() error {
currRC, err := resolvconf.GetSpecific(sb.config.resolvConfPath)
if err != nil {
return err
}
// localhost entries have already been filtered out from the list
// retain only the v4 servers in sb for forwarding the DNS queries
sb.extDNS = resolvconf.GetNameservers(currRC.Content, types.IPv4)
var (
dnsList = []string{sb.resolver.NameServer()}
dnsOptionsList = resolvconf.GetOptions(currRC.Content)
dnsSearchList = resolvconf.GetSearchDomains(currRC.Content)
)
// external v6 DNS servers has to be listed in resolv.conf
dnsList = append(dnsList, resolvconf.GetNameservers(currRC.Content, types.IPv6)...)
// Resolver returns the options in the format resolv.conf expects
dnsOptionsList = append(dnsOptionsList, sb.resolver.ResolverOptions()...)
_, err = resolvconf.Build(sb.config.resolvConfPath, dnsList, dnsSearchList, dnsOptionsList)
return err
}
func setupNetworking(config *Config) error {
if config == nil {
return nil
}
if len(config.DnsConfig.Nameservers) != 0 {
if err := resolvconf.Build("/etc/resolv.conf", config.DnsConfig.Nameservers, config.DnsConfig.Search); err != nil {
return err
}
}
if config.BridgeName != "" {
log.Debugf("Creating bridge %s (%s)", config.BridgeName, config.BridgeAddress)
if err := netconf.ApplyNetworkConfigs(&netconf.NetworkConfig{
Interfaces: map[string]netconf.InterfaceConfig{
config.BridgeName: {
Address: config.BridgeAddress,
MTU: config.BridgeMtu,
Bridge: true,
},
},
}); err != nil {
return err
}
}
return nil
}
func (ep *endpoint) setupDNS() error {
ep.Lock()
container := ep.container
joinInfo := ep.joinInfo
ep.Unlock()
if container == nil {
return ErrNoContainer{}
}
if container.config.resolvConfPath == "" {
container.config.resolvConfPath = defaultPrefix + "/" + container.id + "/resolv.conf"
}
dir, _ := filepath.Split(container.config.resolvConfPath)
err := createBasePath(dir)
if err != nil {
return err
}
if joinInfo.resolvConfPath != "" {
if err := copyFile(joinInfo.resolvConfPath, container.config.resolvConfPath); err != nil {
return fmt.Errorf("could not copy source resolv.conf file %s to %s: %v", joinInfo.resolvConfPath, container.config.resolvConfPath, err)
}
return nil
}
resolvConf, err := resolvconf.Get()
if err != nil {
return err
}
if len(container.config.dnsList) > 0 ||
len(container.config.dnsSearchList) > 0 {
var (
dnsList = resolvconf.GetNameservers(resolvConf)
dnsSearchList = resolvconf.GetSearchDomains(resolvConf)
)
if len(container.config.dnsList) > 0 {
dnsList = container.config.dnsList
}
if len(container.config.dnsSearchList) > 0 {
dnsSearchList = container.config.dnsSearchList
}
return resolvconf.Build(container.config.resolvConfPath, dnsList, dnsSearchList)
}
return ep.updateDNS(resolvConf)
}
func Main() {
args := os.Args
if len(args) > 1 {
fmt.Println("call " + args[0] + " to load network config from cloud-config.yml")
return
}
os.Remove(NETWORK_DONE) // ignore error
cfg, err := config.LoadConfig()
if err != nil {
log.Fatal(err)
}
hostname, _ := cloudinit.SetHostname(cfg) // ignore error
log.Infof("Network: hostname: '%s'", hostname)
if err := netconf.ApplyNetworkConfigs(&cfg.Rancher.Network); err != nil {
log.Error(err)
}
hostname, _ = cloudinit.SetHostname(cfg) // ignore error
log.Infof("Network: hostname: '%s' (from DHCP, if not set by cloud-config)", hostname)
if hostname != "" {
hosts, err := os.Open("/etc/hosts")
defer hosts.Close()
if err != nil {
log.Fatal(err)
}
lines := bufio.NewScanner(hosts)
hostsContent := ""
for lines.Scan() {
line := strings.TrimSpace(lines.Text())
fields := strings.Fields(line)
if len(fields) > 0 && fields[0] == "127.0.1.1" {
hostsContent += "127.0.1.1 " + hostname + "\n"
continue
}
hostsContent += line + "\n"
}
if err := ioutil.WriteFile("/etc/hosts", []byte(hostsContent), 0600); err != nil {
log.Error(err)
}
}
if cfg.Rancher.Network.Dns.Override {
log.WithFields(log.Fields{"nameservers": cfg.Rancher.Network.Dns.Nameservers}).Info("Override nameservers")
if _, err := resolvconf.Build("/etc/resolv.conf", cfg.Rancher.Network.Dns.Nameservers, cfg.Rancher.Network.Dns.Search, nil); err != nil {
log.Error(err)
}
}
if f, err := os.Create(NETWORK_DONE); err != nil {
log.Error(err)
} else {
f.Close()
}
sendTerm(WAIT_FOR_NETWORK)
select {}
}
func (sb *sandbox) setupDNS() error {
if sb.config.resolvConfPath == "" {
sb.config.resolvConfPath = defaultPrefix + "/" + sb.id + "/resolv.conf"
}
sb.config.resolvConfHashFile = sb.config.resolvConfPath + ".hash"
dir, _ := filepath.Split(sb.config.resolvConfPath)
if err := createBasePath(dir); err != nil {
return err
}
// This is for the host mode networking
if sb.config.originResolvConfPath != "" {
if err := copyFile(sb.config.originResolvConfPath, sb.config.resolvConfPath); err != nil {
return fmt.Errorf("could not copy source resolv.conf file %s to %s: %v", sb.config.originResolvConfPath, sb.config.resolvConfPath, err)
}
return nil
}
resolvConf, err := resolvconf.Get()
if err != nil {
return err
}
dnsList := resolvconf.GetNameservers(resolvConf)
dnsSearchList := resolvconf.GetSearchDomains(resolvConf)
dnsOptionsList := resolvconf.GetOptions(resolvConf)
if len(sb.config.dnsList) > 0 || len(sb.config.dnsSearchList) > 0 || len(dnsOptionsList) > 0 {
if len(sb.config.dnsList) > 0 {
dnsList = sb.config.dnsList
}
if len(sb.config.dnsSearchList) > 0 {
dnsSearchList = sb.config.dnsSearchList
}
if len(sb.config.dnsOptionsList) > 0 {
dnsOptionsList = sb.config.dnsOptionsList
}
}
hash, err := resolvconf.Build(sb.config.resolvConfPath, dnsList, dnsSearchList, dnsOptionsList)
if err != nil {
return err
}
// write hash
if err := ioutil.WriteFile(sb.config.resolvConfHashFile, []byte(hash), filePerm); err != nil {
return types.InternalErrorf("failed to write resol.conf hash file when setting up dns for sandbox %s: %v", sb.ID(), err)
}
return nil
}
func Main() {
flags.Parse(os.Args[1:])
log.Infof("Running network: daemon=%v", daemon)
os.Remove(NETWORK_DONE) // ignore error
cfg, err := config.LoadConfig()
if err != nil {
log.Fatal(err)
}
nameservers := cfg.Rancher.Network.Dns.Nameservers
search := cfg.Rancher.Network.Dns.Search
userSetDns := len(nameservers) > 0 || len(search) > 0
if !userSetDns {
nameservers = cfg.Rancher.DefaultNetwork.Dns.Nameservers
search = cfg.Rancher.DefaultNetwork.Dns.Search
}
if _, err := resolvconf.Build("/etc/resolv.conf", nameservers, search, nil); err != nil {
log.Error(err)
}
if err := hostname.SetHostnameFromCloudConfig(cfg); err != nil {
log.Error(err)
}
if err := netconf.ApplyNetworkConfigs(&cfg.Rancher.Network); err != nil {
log.Error(err)
}
userSetHostname := cfg.Hostname != ""
if err := netconf.RunDhcp(&cfg.Rancher.Network, !userSetHostname, !userSetDns); err != nil {
log.Error(err)
}
if err := hostname.SyncHostname(); err != nil {
log.Error(err)
}
if f, err := os.Create(NETWORK_DONE); err != nil {
log.Error(err)
} else {
f.Close()
}
sendTerm(WAIT_FOR_NETWORK)
if daemon {
select {}
}
}
// Embedded DNS server has to be enabled for this sandbox. Rebuild the container's
// resolv.conf by doing the following
// - Save the external name servers in resolv.conf in the sandbox
// - Add only the embedded server's IP to container's resolv.conf
// - If the embedded server needs any resolv.conf options add it to the current list
func (sb *sandbox) rebuildDNS() error {
currRC, err := resolvconf.GetSpecific(sb.config.resolvConfPath)
if err != nil {
return err
}
// localhost entries have already been filtered out from the list
// retain only the v4 servers in sb for forwarding the DNS queries
sb.extDNS = resolvconf.GetNameservers(currRC.Content, types.IPv4)
var (
dnsList = []string{sb.resolver.NameServer()}
dnsOptionsList = resolvconf.GetOptions(currRC.Content)
dnsSearchList = resolvconf.GetSearchDomains(currRC.Content)
)
// external v6 DNS servers has to be listed in resolv.conf
dnsList = append(dnsList, resolvconf.GetNameservers(currRC.Content, types.IPv6)...)
// If the user config and embedded DNS server both have ndots option set,
// remember the user's config so that unqualified names not in the docker
// domain can be dropped.
resOptions := sb.resolver.ResolverOptions()
dnsOpt:
for _, resOpt := range resOptions {
if strings.Contains(resOpt, "ndots") {
for _, option := range dnsOptionsList {
if strings.Contains(option, "ndots") {
parts := strings.Split(option, ":")
if len(parts) != 2 {
return fmt.Errorf("invalid ndots option %v", option)
}
if num, err := strconv.Atoi(parts[1]); err != nil {
return fmt.Errorf("invalid number for ndots option %v", option)
} else if num > 0 {
sb.ndotsSet = true
break dnsOpt
}
}
}
}
}
dnsOptionsList = append(dnsOptionsList, resOptions...)
_, err = resolvconf.Build(sb.config.resolvConfPath, dnsList, dnsSearchList, dnsOptionsList)
return err
}
func (ep *endpoint) setupDNS() error {
ep.Lock()
container := ep.container
ep.Unlock()
if container == nil {
return ErrNoContainer{}
}
if container.config.resolvConfPath == "" {
container.config.resolvConfPath = defaultPrefix + "/" + container.id + "/resolv.conf"
}
dir, _ := filepath.Split(container.config.resolvConfPath)
err := createBasePath(dir)
if err != nil {
return err
}
resolvConf, err := resolvconf.Get()
if err != nil {
return err
}
if len(container.config.dnsList) > 0 ||
len(container.config.dnsSearchList) > 0 {
var (
dnsList = resolvconf.GetNameservers(resolvConf)
dnsSearchList = resolvconf.GetSearchDomains(resolvConf)
)
if len(container.config.dnsList) > 0 {
dnsList = container.config.dnsList
}
if len(container.config.dnsSearchList) > 0 {
dnsSearchList = container.config.dnsSearchList
}
return resolvconf.Build(container.config.resolvConfPath, dnsList, dnsSearchList)
}
return ep.updateDNS(resolvConf)
}
func setupNetworking(config *Config) error {
if config == nil {
return nil
}
hostname, err := os.Hostname()
if err != nil {
return err
}
tryCreateFile("/etc/hosts", `127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
127.0.1.1 `+hostname)
if len(config.DnsConfig.Nameservers) != 0 {
if _, err := resolvconf.Build("/etc/resolv.conf", config.DnsConfig.Nameservers, config.DnsConfig.Search, nil); err != nil {
return err
}
}
if config.BridgeName != "" {
log.Debugf("Creating bridge %s (%s)", config.BridgeName, config.BridgeAddress)
if err := netconf.ApplyNetworkConfigs(&netconf.NetworkConfig{
Interfaces: map[string]netconf.InterfaceConfig{
config.BridgeName: {
Address: config.BridgeAddress,
MTU: config.BridgeMtu,
Bridge: true,
},
},
}); err != nil {
return err
}
}
return nil
}
// Embedded DNS server has to be enabled for this sandbox. Rebuild the container's
// resolv.conf by doing the follwing
// - Save the external name servers in resolv.conf in the sandbox
// - Add only the embedded server's IP to container's resolv.conf
// - If the embedded server needs any resolv.conf options add it to the current list
func (sb *sandbox) rebuildDNS() error {
currRC, err := resolvconf.GetSpecific(sb.config.resolvConfPath)
if err != nil {
return err
}
// localhost entries have already been filtered out from the list
sb.extDNS = resolvconf.GetNameservers(currRC.Content)
var (
dnsList = []string{sb.resolver.NameServer()}
dnsOptionsList = resolvconf.GetOptions(currRC.Content)
dnsSearchList = resolvconf.GetSearchDomains(currRC.Content)
)
// Resolver returns the options in the format resolv.conf expects
dnsOptionsList = append(dnsOptionsList, sb.resolver.ResolverOptions()...)
dir := path.Dir(sb.config.resolvConfPath)
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
}
_, err = resolvconf.Build(tmpResolvFile.Name(), dnsList, dnsSearchList, dnsOptionsList)
if err != nil {
return err
}
return os.Rename(tmpResolvFile.Name(), sb.config.resolvConfPath)
}
func (sb *sandbox) setupDNS() error {
var newRC *resolvconf.File
if sb.config.resolvConfPath == "" {
sb.config.resolvConfPath = defaultPrefix + "/" + sb.id + "/resolv.conf"
}
sb.config.resolvConfHashFile = sb.config.resolvConfPath + ".hash"
dir, _ := filepath.Split(sb.config.resolvConfPath)
if err := createBasePath(dir); err != nil {
return err
}
// This is for the host mode networking
if sb.config.originResolvConfPath != "" {
if err := copyFile(sb.config.originResolvConfPath, sb.config.resolvConfPath); err != nil {
return fmt.Errorf("could not copy source resolv.conf file %s to %s: %v", sb.config.originResolvConfPath, sb.config.resolvConfPath, err)
}
return nil
}
currRC, err := resolvconf.Get()
if err != nil {
return err
}
if len(sb.config.dnsList) > 0 || len(sb.config.dnsSearchList) > 0 || len(sb.config.dnsOptionsList) > 0 {
var (
err error
dnsList = resolvconf.GetNameservers(currRC.Content, types.IP)
dnsSearchList = resolvconf.GetSearchDomains(currRC.Content)
dnsOptionsList = resolvconf.GetOptions(currRC.Content)
)
if len(sb.config.dnsList) > 0 {
dnsList = sb.config.dnsList
}
if len(sb.config.dnsSearchList) > 0 {
dnsSearchList = sb.config.dnsSearchList
}
if len(sb.config.dnsOptionsList) > 0 {
dnsOptionsList = sb.config.dnsOptionsList
}
newRC, err = resolvconf.Build(sb.config.resolvConfPath, dnsList, dnsSearchList, dnsOptionsList)
if err != nil {
return err
}
} else {
// Replace any localhost/127.* (at this point we have no info about ipv6, pass it as true)
if newRC, err = resolvconf.FilterResolvDNS(currRC.Content, true); err != nil {
return err
}
// No contention on container resolv.conf file at sandbox creation
if err := ioutil.WriteFile(sb.config.resolvConfPath, newRC.Content, filePerm); err != nil {
return types.InternalErrorf("failed to write unhaltered resolv.conf file content when setting up dns for sandbox %s: %v", sb.ID(), err)
}
}
// Write hash
if err := ioutil.WriteFile(sb.config.resolvConfHashFile, []byte(newRC.Hash), filePerm); err != nil {
return types.InternalErrorf("failed to write resolv.conf hash file when setting up dns for sandbox %s: %v", sb.ID(), err)
}
return nil
}
func (sb *sandbox) setupDNS() error {
var newRC *resolvconf.File
if sb.config.resolvConfPath == "" {
sb.config.resolvConfPath = defaultPrefix + "/" + sb.id + "/resolv.conf"
}
sb.config.resolvConfHashFile = sb.config.resolvConfPath + ".hash"
dir, _ := filepath.Split(sb.config.resolvConfPath)
if err := createBasePath(dir); err != nil {
return err
}
// This is for the host mode networking
if sb.config.originResolvConfPath != "" {
if err := copyFile(sb.config.originResolvConfPath, sb.config.resolvConfPath); err != nil {
return fmt.Errorf("could not copy source resolv.conf file %s to %s: %v", sb.config.originResolvConfPath, sb.config.resolvConfPath, err)
}
return nil
}
currRC, err := resolvconf.Get()
if err != nil {
return err
}
if len(sb.config.dnsList) > 0 || len(sb.config.dnsSearchList) > 0 || len(sb.config.dnsOptionsList) > 0 {
var (
err error
dnsList = resolvconf.GetNameservers(currRC.Content, types.IP)
dnsSearchList = resolvconf.GetSearchDomains(currRC.Content)
dnsOptionsList = resolvconf.GetOptions(currRC.Content)
)
if len(sb.config.dnsList) > 0 {
dnsList = sb.config.dnsList
}
if len(sb.config.dnsSearchList) > 0 {
dnsSearchList = sb.config.dnsSearchList
}
if len(sb.config.dnsOptionsList) > 0 {
dnsOptionsList = sb.config.dnsOptionsList
}
newRC, err = resolvconf.Build(sb.config.resolvConfPath, dnsList, dnsSearchList, dnsOptionsList)
if err != nil {
return err
}
// After building the resolv.conf from the user config save the
// external resolvers in the sandbox. Note that --dns 127.0.0.x
// config refers to the loopback in the container namespace
sb.setExternalResolvers(newRC.Content, types.IPv4, false)
} else {
// If the host resolv.conf file has 127.0.0.x container should
// use the host restolver for queries. This is supported by the
// docker embedded DNS server. Hence save the external resolvers
// before filtering it out.
sb.setExternalResolvers(currRC.Content, types.IPv4, true)
// Replace any localhost/127.* (at this point we have no info about ipv6, pass it as true)
if newRC, err = resolvconf.FilterResolvDNS(currRC.Content, true); err != nil {
return err
}
// No contention on container resolv.conf file at sandbox creation
if err := ioutil.WriteFile(sb.config.resolvConfPath, newRC.Content, filePerm); err != nil {
return types.InternalErrorf("failed to write unhaltered resolv.conf file content when setting up dns for sandbox %s: %v", sb.ID(), err)
}
}
// Write hash
if err := ioutil.WriteFile(sb.config.resolvConfHashFile, []byte(newRC.Hash), filePerm); err != nil {
return types.InternalErrorf("failed to write resolv.conf hash file when setting up dns for sandbox %s: %v", sb.ID(), err)
}
return nil
}
