func validateAndGetNetworkPluginName(originClient *osclient.Client, pluginName string) (string, error) {
if sdnplugin.IsOpenShiftNetworkPlugin(pluginName) {
// Detect any plugin mismatches between node and master
clusterNetwork, err := originClient.ClusterNetwork().Get(sdnapi.ClusterNetworkDefault)
if kerrs.IsNotFound(err) {
return "", fmt.Errorf("master has not created a default cluster network, network plugin %q can not start", pluginName)
} else if err != nil {
return "", fmt.Errorf("cannot fetch %q cluster network: %v", sdnapi.ClusterNetworkDefault, err)
}
if clusterNetwork.PluginName != strings.ToLower(pluginName) {
if len(clusterNetwork.PluginName) != 0 {
return "", fmt.Errorf("detected network plugin mismatch between OpenShift node(%q) and master(%q)", pluginName, clusterNetwork.PluginName)
} else {
// Do not return error in this case
glog.Warningf(`either there is network plugin mismatch between OpenShift node(%q) and master or OpenShift master is running an older version where we did not persist plugin name`, pluginName)
}
}
} else if pluginName == "" {
// Auto detect network plugin configured by master
clusterNetwork, err := originClient.ClusterNetwork().Get(sdnapi.ClusterNetworkDefault)
if err == nil {
return clusterNetwork.PluginName, nil
}
}
return pluginName, nil
}
func StartNode(nodeConfig configapi.NodeConfig, components *utilflags.ComponentFlag) error {
config, err := kubernetes.BuildKubernetesNodeConfig(nodeConfig, components.Enabled(ComponentProxy), components.Enabled(ComponentDNS))
if err != nil {
return err
}
// In case of openshift network plugin, nodeConfig.networkPluginName is optional and is auto detected/finalized
// once we build kubernetes node config. So perform plugin name related check here.
if sdnplugin.IsOpenShiftNetworkPlugin(config.KubeletServer.NetworkPluginName) {
// TODO: SDN plugin depends on the Kubelet registering as a Node and doesn't retry cleanly,
// and Kubelet also can't start the PodSync loop until the SDN plugin has loaded.
if components.Enabled(ComponentKubelet) != components.Enabled(ComponentPlugins) {
return fmt.Errorf("the SDN plugin must be run in the same process as the kubelet")
}
}
if components.Enabled(ComponentKubelet) {
glog.Infof("Starting node %s (%s)", config.KubeletServer.HostnameOverride, version.Get().String())
} else {
glog.Infof("Starting node networking %s (%s)", config.KubeletServer.HostnameOverride, version.Get().String())
}
_, kubeClientConfig, err := configapi.GetKubeClient(nodeConfig.MasterKubeConfig, nodeConfig.MasterClientConnectionOverrides)
if err != nil {
return err
}
glog.Infof("Connecting to API server %s", kubeClientConfig.Host)
// preconditions
if components.Enabled(ComponentKubelet) {
config.EnsureKubeletAccess()
config.EnsureVolumeDir()
config.EnsureDocker(docker.NewHelper())
config.EnsureLocalQuota(nodeConfig) // must be performed after EnsureVolumeDir
}
if components.Enabled(ComponentKubelet) {
config.RunKubelet()
}
if components.Enabled(ComponentPlugins) {
config.RunPlugin()
}
if components.Enabled(ComponentProxy) {
config.RunProxy()
}
if components.Enabled(ComponentDNS) {
config.RunDNS()
}
config.RunServiceStores(components.Enabled(ComponentProxy), components.Enabled(ComponentDNS))
return nil
}
func BuildKubernetesNodeConfig(options configapi.NodeConfig, enableProxy, enableDNS bool) (*NodeConfig, error) {
originClient, _, err := configapi.GetOpenShiftClient(options.MasterKubeConfig, options.MasterClientConnectionOverrides)
if err != nil {
return nil, err
}
kubeClient, _, err := configapi.GetKubeClient(options.MasterKubeConfig, options.MasterClientConnectionOverrides)
if err != nil {
return nil, err
}
// Make a separate client for event reporting, to avoid event QPS blocking node calls
eventClient, _, err := configapi.GetKubeClient(options.MasterKubeConfig, options.MasterClientConnectionOverrides)
if err != nil {
return nil, err
}
if options.NodeName == "localhost" {
glog.Warningf(`Using "localhost" as node name will not resolve from all locations`)
}
clientCAs, err := kcrypto.CertPoolFromFile(options.ServingInfo.ClientCA)
if err != nil {
return nil, err
}
imageTemplate := variable.NewDefaultImageTemplate()
imageTemplate.Format = options.ImageConfig.Format
imageTemplate.Latest = options.ImageConfig.Latest
var path string
var fileCheckInterval int64
if options.PodManifestConfig != nil {
path = options.PodManifestConfig.Path
fileCheckInterval = options.PodManifestConfig.FileCheckIntervalSeconds
}
kubeAddressStr, kubePortStr, err := net.SplitHostPort(options.ServingInfo.BindAddress)
if err != nil {
return nil, fmt.Errorf("cannot parse node address: %v", err)
}
kubePort, err := strconv.Atoi(kubePortStr)
if err != nil {
return nil, fmt.Errorf("cannot parse node port: %v", err)
}
if err = validateNetworkPluginName(originClient, options.NetworkConfig.NetworkPluginName); err != nil {
return nil, err
}
// Defaults are tested in TestKubeletDefaults
server := kubeletoptions.NewKubeletServer()
// Adjust defaults
server.RequireKubeConfig = true
server.PodManifestPath = path
server.RootDirectory = options.VolumeDirectory
server.NodeIP = options.NodeIP
server.HostnameOverride = options.NodeName
server.AllowPrivileged = true
server.RegisterNode = true
server.Address = kubeAddressStr
server.Port = int32(kubePort)
server.ReadOnlyPort = 0 // no read only access
server.CAdvisorPort = 0 // no unsecured cadvisor access
server.HealthzPort = 0 // no unsecured healthz access
server.HealthzBindAddress = "" // no unsecured healthz access
server.ClusterDNS = options.DNSIP
server.ClusterDomain = options.DNSDomain
server.NetworkPluginName = options.NetworkConfig.NetworkPluginName
server.HostNetworkSources = []string{kubelettypes.ApiserverSource, kubelettypes.FileSource}
server.HostPIDSources = []string{kubelettypes.ApiserverSource, kubelettypes.FileSource}
server.HostIPCSources = []string{kubelettypes.ApiserverSource, kubelettypes.FileSource}
server.HTTPCheckFrequency = unversioned.Duration{Duration: time.Duration(0)} // no remote HTTP pod creation access
server.FileCheckFrequency = unversioned.Duration{Duration: time.Duration(fileCheckInterval) * time.Second}
server.PodInfraContainerImage = imageTemplate.ExpandOrDie("pod")
server.CPUCFSQuota = true // enable cpu cfs quota enforcement by default
server.MaxPods = 250
server.PodsPerCore = 10
server.SerializeImagePulls = false // disable serialized image pulls by default
server.EnableControllerAttachDetach = false // stay consistent with existing config, but admins should enable it
if enableDNS {
// if we are running local DNS, skydns will load the default recursive nameservers for us
server.ResolverConfig = ""
}
server.DockerExecHandlerName = string(options.DockerConfig.ExecHandlerName)
if sdnplugin.IsOpenShiftNetworkPlugin(server.NetworkPluginName) {
// set defaults for openshift-sdn
server.HairpinMode = componentconfig.HairpinNone
server.ConfigureCBR0 = false
}
// prevents kube from generating certs
server.TLSCertFile = options.ServingInfo.ServerCert.CertFile
server.TLSPrivateKeyFile = options.ServingInfo.ServerCert.KeyFile
containerized := cmdutil.Env("OPENSHIFT_CONTAINERIZED", "") == "true"
server.Containerized = containerized
// resolve extended arguments
// TODO: this should be done in config validation (along with the above) so we can provide
// proper errors
if err := cmdflags.Resolve(options.KubeletArguments, server.AddFlags); len(err) > 0 {
return nil, kerrors.NewAggregate(err)
}
proxyconfig, err := buildKubeProxyConfig(options)
if err != nil {
return nil, err
}
deps, err := kubeletapp.UnsecuredKubeletDeps(server)
if err != nil {
return nil, err
}
// provide any config overrides
//deps.NodeName = options.NodeName
deps.KubeClient = clientadapter.FromUnversionedClient(kubeClient)
deps.EventClient = clientadapter.FromUnversionedClient(eventClient)
// Setup auth
authnTTL, err := time.ParseDuration(options.AuthConfig.AuthenticationCacheTTL)
if err != nil {
return nil, err
}
authn, err := newAuthenticator(deps.KubeClient.Authentication(), clientCAs, authnTTL, options.AuthConfig.AuthenticationCacheSize)
if err != nil {
return nil, err
}
authzAttr, err := newAuthorizerAttributesGetter(options.NodeName)
if err != nil {
return nil, err
}
authzTTL, err := time.ParseDuration(options.AuthConfig.AuthorizationCacheTTL)
if err != nil {
return nil, err
}
authz, err := newAuthorizer(originClient, authzTTL, options.AuthConfig.AuthorizationCacheSize)
if err != nil {
return nil, err
}
deps.Auth = kubeletserver.NewKubeletAuth(authn, authzAttr, authz)
// TODO: could be cleaner
if configapi.UseTLS(options.ServingInfo) {
extraCerts, err := configapi.GetNamedCertificateMap(options.ServingInfo.NamedCertificates)
if err != nil {
return nil, err
}
deps.TLSOptions = &kubeletserver.TLSOptions{
Config: crypto.SecureTLSConfig(&tls.Config{
// RequestClientCert lets us request certs, but allow requests without client certs
// Verification is done by the authn layer
ClientAuth: tls.RequestClientCert,
ClientCAs: clientCAs,
// Set SNI certificate func
// Do not use NameToCertificate, since that requires certificates be included in the server's tlsConfig.Certificates list,
// which we do not control when running with http.Server#ListenAndServeTLS
GetCertificate: cmdutil.GetCertificateFunc(extraCerts),
}),
CertFile: options.ServingInfo.ServerCert.CertFile,
KeyFile: options.ServingInfo.ServerCert.KeyFile,
}
} else {
deps.TLSOptions = nil
}
iptablesSyncPeriod, err := time.ParseDuration(options.IPTablesSyncPeriod)
if err != nil {
return nil, fmt.Errorf("Cannot parse the provided ip-tables sync period (%s) : %v", options.IPTablesSyncPeriod, err)
}
sdnPlugin, err := sdnplugin.NewNodePlugin(options.NetworkConfig.NetworkPluginName, originClient, kubeClient, options.NodeName, options.NodeIP, iptablesSyncPeriod, options.NetworkConfig.MTU)
if err != nil {
return nil, fmt.Errorf("SDN initialization failed: %v", err)
}
if sdnPlugin != nil {
deps.NetworkPlugins = append(deps.NetworkPlugins, sdnPlugin)
}
endpointFilter, err := sdnplugin.NewProxyPlugin(options.NetworkConfig.NetworkPluginName, originClient, kubeClient)
if err != nil {
return nil, fmt.Errorf("SDN proxy initialization failed: %v", err)
}
config := &NodeConfig{
BindAddress: options.ServingInfo.BindAddress,
AllowDisabledDocker: options.AllowDisabledDocker,
Containerized: containerized,
Client: kubeClient,
VolumeDir: options.VolumeDirectory,
KubeletServer: server,
KubeletDeps: deps,
ServicesReady: make(chan struct{}),
ProxyConfig: proxyconfig,
EnableUnidling: options.EnableUnidling,
SDNPlugin: sdnPlugin,
FilteringEndpointsHandler: endpointFilter,
}
if enableDNS {
dnsConfig, err := dns.NewServerDefaults()
if err != nil {
return nil, fmt.Errorf("DNS configuration was not possible: %v", err)
}
if len(options.DNSIP) > 0 {
dnsConfig.DnsAddr = options.DNSIP + ":53"
}
dnsConfig.Domain = server.ClusterDomain + "."
dnsConfig.Local = "openshift.default.svc." + dnsConfig.Domain
services, serviceStore := dns.NewCachedServiceAccessorAndStore()
endpoints, endpointsStore := dns.NewCachedEndpointsAccessorAndStore()
if !enableProxy {
endpoints = kubeClient
endpointsStore = nil
}
// TODO: use kubeletConfig.ResolverConfig as an argument to etcd in the event the
// user sets it, instead of passing it to the kubelet.
config.ServiceStore = serviceStore
config.EndpointsStore = endpointsStore
config.DNSServer = &dns.Server{
Config: dnsConfig,
Services: services,
Endpoints: endpoints,
MetricsName: "node",
}
}
return config, nil
}