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node.go
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node.go
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package kubernetes
import (
"fmt"
"net"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
dockerclient "github.com/fsouza/go-dockerclient"
"github.com/golang/glog"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/kubelet/cadvisor"
"k8s.io/kubernetes/pkg/kubelet/dockertools"
pconfig "k8s.io/kubernetes/pkg/proxy/config"
proxy "k8s.io/kubernetes/pkg/proxy/userspace"
"k8s.io/kubernetes/pkg/util"
utildbus "k8s.io/kubernetes/pkg/util/dbus"
kexec "k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/iptables"
cmdutil "github.com/openshift/origin/pkg/cmd/util"
dockerutil "github.com/openshift/origin/pkg/cmd/util/docker"
)
type commandExecutor interface {
LookPath(executable string) (string, error)
Run(command string, args ...string) error
}
type defaultCommandExecutor struct{}
func (ce defaultCommandExecutor) LookPath(executable string) (string, error) {
return exec.LookPath(executable)
}
func (ce defaultCommandExecutor) Run(command string, args ...string) error {
c := exec.Command(command, args...)
return c.Run()
}
const minimumDockerAPIVersionWithPullByID = "1.18"
// EnsureDocker attempts to connect to the Docker daemon defined by the helper,
// and if it is unable to it will print a warning.
func (c *NodeConfig) EnsureDocker(docker *dockerutil.Helper) {
dockerClient, dockerAddr := docker.GetClientOrExit()
if err := dockerClient.Ping(); err != nil {
c.HandleDockerError(fmt.Sprintf("Docker could not be reached at %s. Docker must be installed and running to start containers.\n%v", dockerAddr, err))
return
}
glog.Infof("Connecting to Docker at %s", dockerAddr)
env, err := dockerClient.Version()
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
return
}
serverVersionString := env.Get("ApiVersion")
serverVersion, err := dockerclient.NewAPIVersion(serverVersionString)
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to determine Docker server version from %q.\n%v", serverVersionString, err))
return
}
minimumPullByIDVersion, err := dockerclient.NewAPIVersion(minimumDockerAPIVersionWithPullByID)
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
return
}
if serverVersion.LessThan(minimumPullByIDVersion) {
c.HandleDockerError(fmt.Sprintf("Docker 1.6 or later (server API version 1.18 or later) required."))
return
}
c.DockerClient = dockerClient
}
// HandleDockerError handles an an error from the docker daemon
func (c *NodeConfig) HandleDockerError(message string) {
if !c.AllowDisabledDocker {
glog.Fatalf("ERROR: %s", message)
}
glog.Errorf("WARNING: %s", message)
c.DockerClient = &dockertools.FakeDockerClient{VersionInfo: dockerclient.Env([]string{"ApiVersion=1.18"})}
}
// EnsureVolumeDir attempts to convert the provided volume directory argument to
// an absolute path and create the directory if it does not exist. Will exit if
// an error is encountered.
func (c *NodeConfig) EnsureVolumeDir() {
if volumeDir, err := c.initializeVolumeDir(&defaultCommandExecutor{}, c.VolumeDir); err != nil {
glog.Fatal(err)
} else {
c.VolumeDir = volumeDir
}
}
func (c *NodeConfig) initializeVolumeDir(ce commandExecutor, path string) (string, error) {
rootDirectory, err := filepath.Abs(path)
if err != nil {
return "", fmt.Errorf("Error converting volume directory to an absolute path: %v", err)
}
if _, err := os.Stat(rootDirectory); os.IsNotExist(err) {
if err := os.MkdirAll(rootDirectory, 0750); err != nil {
return "", fmt.Errorf("Couldn't create kubelet volume root directory '%s': %s", rootDirectory, err)
}
}
// always try to chcon, in case the volume dir existed prior to the node starting
if chconPath, err := ce.LookPath("chcon"); err != nil {
glog.V(2).Infof("Couldn't locate 'chcon' to set the kubelet volume root directory SELinux context: %s", err)
} else {
if err := ce.Run(chconPath, "-t", "svirt_sandbox_file_t", rootDirectory); err != nil {
glog.Warningf("Error running 'chcon' to set the kubelet volume root directory SELinux context: %s", err)
}
}
return rootDirectory, nil
}
// RunKubelet starts the Kubelet.
func (c *NodeConfig) RunKubelet() {
// TODO: clean this up and make it more formal (service named 'dns'?). Use multiple ports.
clusterDNS := c.KubeletConfig.ClusterDNS
if clusterDNS == nil {
if service, err := c.Client.Endpoints(kapi.NamespaceDefault).Get("kubernetes"); err == nil {
if ip, ok := firstIP(service, 53); ok {
if err := cmdutil.WaitForSuccessfulDial(false, "tcp", fmt.Sprintf("%s:%d", ip, 53), 50*time.Millisecond, 0, 2); err == nil {
c.KubeletConfig.ClusterDNS = net.ParseIP(ip)
}
}
}
}
c.KubeletConfig.DockerClient = c.DockerClient
// updated by NodeConfig.EnsureVolumeDir
c.KubeletConfig.RootDirectory = c.VolumeDir
// hook for overriding the cadvisor interface for integration tests
c.KubeletConfig.CAdvisorInterface = defaultCadvisorInterface
go func() {
glog.Fatal(c.KubeletServer.Run(c.KubeletConfig))
}()
}
// defaultCadvisorInterface holds the overridden default interface
// exists only to allow stubbing integration tests, should always be nil in production
var defaultCadvisorInterface cadvisor.Interface = nil
// SetFakeCadvisorInterfaceForIntegrationTest sets a fake cadvisor implementation to allow the node to run in integration tests
func SetFakeCadvisorInterfaceForIntegrationTest() {
defaultCadvisorInterface = &cadvisor.Fake{}
}
type FilteringEndpointsConfigHandler interface {
pconfig.EndpointsConfigHandler
SetBaseEndpointsHandler(base pconfig.EndpointsConfigHandler)
}
// RunProxy starts the proxy
func (c *NodeConfig) RunProxy(endpointsFilterer FilteringEndpointsConfigHandler) {
// initialize kube proxy
serviceConfig := pconfig.NewServiceConfig()
endpointsConfig := pconfig.NewEndpointsConfig()
loadBalancer := proxy.NewLoadBalancerRR()
if endpointsFilterer == nil {
endpointsConfig.RegisterHandler(loadBalancer)
} else {
endpointsFilterer.SetBaseEndpointsHandler(loadBalancer)
endpointsConfig.RegisterHandler(endpointsFilterer)
}
host, _, err := net.SplitHostPort(c.BindAddress)
if err != nil {
glog.Fatalf("The provided value to bind to must be an ip:port %q", c.BindAddress)
}
ip := net.ParseIP(host)
if ip == nil {
glog.Fatalf("The provided value to bind to must be an ip:port: %q", c.BindAddress)
}
protocol := iptables.ProtocolIpv4
if ip.To4() == nil {
protocol = iptables.ProtocolIpv6
}
syncPeriod, err := time.ParseDuration(c.IPTablesSyncPeriod)
if err != nil {
glog.Fatalf("Cannot parse the provided ip-tables sync period (%s) : %v", c.IPTablesSyncPeriod, err)
}
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartRecordingToSink(c.Client.Events(""))
recorder := eventBroadcaster.NewRecorder(kapi.EventSource{Component: "kube-proxy", Host: c.KubeletConfig.NodeName})
nodeRef := &kapi.ObjectReference{
Kind: "Node",
Name: c.KubeletConfig.NodeName,
}
go util.Forever(func() {
dbus := utildbus.New()
iptables := iptables.New(kexec.New(), dbus, protocol)
proxier, err := proxy.NewProxier(loadBalancer, ip, iptables, util.PortRange{}, syncPeriod)
if err != nil {
switch {
// conflicting use of iptables, retry
case proxy.IsProxyLocked(err):
glog.Errorf("Unable to start proxy, will retry: %v", err)
return
// on a system without iptables
case strings.Contains(err.Error(), "executable file not found in path"):
glog.V(4).Infof("kube-proxy initialization error: %v", err)
glog.Warningf("WARNING: Could not find the iptables command. The service proxy requires iptables and will be disabled.")
case err == proxy.ErrProxyOnLocalhost:
glog.Warningf("WARNING: The service proxy cannot bind to localhost and will be disabled.")
case strings.Contains(err.Error(), "you must be root"):
glog.Warningf("WARNING: Could not modify iptables. You must run this process as root to use the service proxy.")
default:
glog.Warningf("WARNING: Could not modify iptables. You must run this process as root to use the service proxy: %v", err)
}
select {}
}
pconfig.NewSourceAPI(
c.Client,
10*time.Minute,
serviceConfig.Channel("api"),
endpointsConfig.Channel("api"))
serviceConfig.RegisterHandler(proxier)
recorder.Eventf(nodeRef, "Starting", "Starting kube-proxy.")
glog.Infof("Started Kubernetes Proxy on %s", host)
select {}
}, 5*time.Second)
}
// TODO: more generic location
func includesPort(ports []kapi.EndpointPort, port int) bool {
for _, p := range ports {
if p.Port == port {
return true
}
}
return false
}
// TODO: more generic location
func firstIP(endpoints *kapi.Endpoints, port int) (string, bool) {
for _, s := range endpoints.Subsets {
if !includesPort(s.Ports, port) {
continue
}
for _, a := range s.Addresses {
return a.IP, true
}
}
return "", false
}