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proxy.go
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proxy.go
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package openshift_sdn
import (
"fmt"
"net"
"net/http"
"time"
sdnproxy "github.com/openshift/sdn/pkg/network/proxy"
"github.com/openshift/sdn/pkg/network/proxyimpl/hybrid"
"github.com/openshift/sdn/pkg/network/proxyimpl/unidler"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
utilnet "k8s.io/apimachinery/pkg/util/net"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
utilwait "k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apiserver/pkg/server/mux"
"k8s.io/apiserver/pkg/server/routes"
"k8s.io/client-go/kubernetes/scheme"
kv1core "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/record"
"k8s.io/component-base/metrics/legacyregistry"
"k8s.io/klog/v2"
kubeproxyoptions "k8s.io/kubernetes/cmd/kube-proxy/app"
proxy "k8s.io/kubernetes/pkg/proxy"
kubeproxyconfig "k8s.io/kubernetes/pkg/proxy/apis/config"
pconfig "k8s.io/kubernetes/pkg/proxy/config"
"k8s.io/kubernetes/pkg/proxy/healthcheck"
"k8s.io/kubernetes/pkg/proxy/iptables"
"k8s.io/kubernetes/pkg/proxy/metrics"
"k8s.io/kubernetes/pkg/proxy/userspace"
proxyutiliptables "k8s.io/kubernetes/pkg/proxy/util/iptables"
utiliptables "k8s.io/kubernetes/pkg/util/iptables"
utilsysctl "k8s.io/kubernetes/pkg/util/sysctl"
utilexec "k8s.io/utils/exec"
)
// readProxyConfig reads the proxy config from a file
func readProxyConfig(filename string) (*kubeproxyconfig.KubeProxyConfiguration, error) {
o := kubeproxyoptions.NewOptions()
o.ConfigFile = filename
if err := o.Complete(); err != nil {
return nil, err
}
return o.GetConfig(), nil
}
// initProxy sets up the proxy process.
func (sdn *OpenShiftSDN) initProxy() error {
var err error
sdn.OsdnProxy, err = sdnproxy.New(
sdn.informers.NetworkClient,
sdn.informers.KubeClient,
sdn.informers.NetworkInformers)
return err
}
// runProxy starts the configured proxy process and closes the provided channel
// when the proxy has initialized
func (sdn *OpenShiftSDN) runProxy(waitChan chan<- bool) {
if string(sdn.ProxyConfig.Mode) == "disabled" {
klog.Warningf("Built-in kube-proxy is disabled")
sdn.startMetricsServer()
close(waitChan)
return
}
bindAddr := net.ParseIP(sdn.ProxyConfig.BindAddress)
nodeAddr := bindAddr
if nodeAddr.IsUnspecified() {
nodeAddr = net.ParseIP(sdn.nodeIP)
if nodeAddr == nil {
klog.Fatalf("Unable to parse node IP %q", sdn.nodeIP)
}
}
protocol := utiliptables.ProtocolIPv4
if nodeAddr.To4() == nil {
protocol = utiliptables.ProtocolIPv6
}
portRange := utilnet.ParsePortRangeOrDie(sdn.ProxyConfig.PortRange)
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartRecordingToSink(&kv1core.EventSinkImpl{Interface: sdn.informers.KubeClient.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "kube-proxy", Host: sdn.nodeName})
execer := utilexec.New()
iptInterface := utiliptables.New(execer, protocol)
var proxier proxy.Provider
var healthzServer healthcheck.ProxierHealthUpdater
if len(sdn.ProxyConfig.HealthzBindAddress) > 0 {
nodeRef := &v1.ObjectReference{
Kind: "Node",
Name: sdn.nodeName,
UID: types.UID(sdn.nodeName),
Namespace: "",
}
healthzServer = healthcheck.NewProxierHealthServer(sdn.ProxyConfig.HealthzBindAddress, 2*sdn.ProxyConfig.IPTables.SyncPeriod.Duration, recorder, nodeRef)
}
enableUnidling := false
var err error
switch string(sdn.ProxyConfig.Mode) {
case "unidling+iptables":
enableUnidling = true
fallthrough
case "iptables":
klog.V(0).Infof("Using %s Proxier.", sdn.ProxyConfig.Mode)
if sdn.ProxyConfig.IPTables.MasqueradeBit == nil {
// IPTablesMasqueradeBit must be specified or defaulted.
klog.Fatalf("Unable to read IPTablesMasqueradeBit from config")
}
var localDetector proxyutiliptables.LocalTrafficDetector
if sdn.ProxyConfig.ClusterCIDR == "" {
klog.Warningf("Kubeproxy does not support multiple cluster CIDRs, configuring no-op local traffic detector")
localDetector = proxyutiliptables.NewNoOpLocalDetector()
} else {
localDetector, err = proxyutiliptables.NewDetectLocalByCIDR(sdn.ProxyConfig.ClusterCIDR, iptInterface)
if err != nil {
klog.Fatalf("Unable to configure local traffic detector: %v", err)
}
}
proxier, err = iptables.NewProxier(
iptInterface,
utilsysctl.New(),
execer,
sdn.ProxyConfig.IPTables.SyncPeriod.Duration,
sdn.ProxyConfig.IPTables.MinSyncPeriod.Duration,
sdn.ProxyConfig.IPTables.MasqueradeAll,
int(*sdn.ProxyConfig.IPTables.MasqueradeBit),
localDetector,
sdn.nodeName,
nodeAddr,
recorder,
healthzServer,
sdn.ProxyConfig.NodePortAddresses,
)
metrics.RegisterMetrics()
if err != nil {
klog.Fatalf("error: Could not initialize Kubernetes Proxy. You must run this process as root (and if containerized, in the host network namespace as privileged) to use the service proxy: %v", err)
}
// No turning back. Remove artifacts that might still exist from the userspace Proxier.
klog.V(0).Info("Tearing down userspace rules.")
userspace.CleanupLeftovers(iptInterface)
case "userspace":
klog.V(0).Info("Using userspace Proxier.")
execer := utilexec.New()
proxier, err = userspace.NewProxier(
userspace.NewLoadBalancerRR(),
bindAddr,
iptInterface,
execer,
*portRange,
sdn.ProxyConfig.IPTables.SyncPeriod.Duration,
sdn.ProxyConfig.IPTables.MinSyncPeriod.Duration,
sdn.ProxyConfig.UDPIdleTimeout.Duration,
sdn.ProxyConfig.NodePortAddresses,
)
if err != nil {
klog.Fatalf("error: Could not initialize Kubernetes Proxy. You must run this process as root (and if containerized, in the host network namespace as privileged) to use the service proxy: %v", err)
}
// Remove artifacts from the pure-iptables Proxier.
klog.V(0).Info("Tearing down pure-iptables proxy rules.")
iptables.CleanupLeftovers(iptInterface)
default:
klog.Fatalf("Unknown proxy mode %q", sdn.ProxyConfig.Mode)
}
// Create configs (i.e. Watches for Services and Endpoints)
// Note: RegisterHandler() calls need to happen before creation of Sources because sources
// only notify on changes, and the initial update (on process start) may be lost if no handlers
// are registered yet.
serviceConfig := pconfig.NewServiceConfig(
sdn.informers.KubeInformers.Core().V1().Services(),
sdn.ProxyConfig.IPTables.SyncPeriod.Duration,
)
if enableUnidling {
signaler := unidler.NewEventSignaler(recorder)
unidlingUserspaceProxy, err := unidler.NewUnidlerProxier(userspace.NewLoadBalancerRR(), bindAddr, iptInterface, execer, *portRange, sdn.ProxyConfig.IPTables.SyncPeriod.Duration, sdn.ProxyConfig.IPTables.MinSyncPeriod.Duration, sdn.ProxyConfig.UDPIdleTimeout.Duration, sdn.ProxyConfig.NodePortAddresses, signaler)
if err != nil {
klog.Fatalf("error: Could not initialize Kubernetes Proxy. You must run this process as root (and if containerized, in the host network namespace as privileged) to use the service proxy: %v", err)
}
hp, ok := proxier.(hybrid.RunnableProxy)
if !ok {
// unreachable
klog.Fatalf("unidling proxy must be used in iptables mode")
}
proxier, err = hybrid.NewHybridProxier(
hp,
unidlingUserspaceProxy,
sdn.ProxyConfig.IPTables.MinSyncPeriod.Duration,
sdn.informers.KubeInformers.Core().V1().Services().Lister(),
)
if err != nil {
klog.Fatalf("error: Could not initialize Kubernetes Proxy. You must run this process as root (and if containerized, in the host network namespace as privileged) to use the service proxy: %v", err)
}
}
endpointsConfig := pconfig.NewEndpointSliceConfig(
sdn.informers.KubeInformers.Discovery().V1beta1().EndpointSlices(),
sdn.ProxyConfig.IPTables.SyncPeriod.Duration,
)
// customized handling registration that inserts a filter if needed
if err := sdn.OsdnProxy.Start(proxier, waitChan); err != nil {
klog.Fatalf("error: node proxy plugin startup failed: %v", err)
}
proxier = sdn.OsdnProxy
serviceConfig.RegisterEventHandler(proxier)
go serviceConfig.Run(utilwait.NeverStop)
endpointsConfig.RegisterEventHandler(proxier)
go endpointsConfig.Run(utilwait.NeverStop)
// Start up healthz server
if len(sdn.ProxyConfig.HealthzBindAddress) > 0 {
serveHealthz(healthzServer)
}
// Start up a metrics server if requested
sdn.startMetricsServer()
// periodically sync k8s iptables rules
go utilwait.Forever(proxier.SyncLoop, 0)
klog.Infof("Started Kubernetes Proxy on %s", sdn.ProxyConfig.BindAddress)
}
func (sdn *OpenShiftSDN) startMetricsServer() {
if sdn.ProxyConfig.MetricsBindAddress == "" {
return
}
mux := mux.NewPathRecorderMux("kube-proxy")
mux.HandleFunc("/proxyMode", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "%s", sdn.ProxyConfig.Mode)
})
mux.Handle("/metrics", legacyregistry.Handler())
if sdn.ProxyConfig.EnableProfiling {
routes.Profiling{}.Install(mux)
}
go utilwait.Until(func() {
err := http.ListenAndServe(sdn.ProxyConfig.MetricsBindAddress, mux)
if err != nil {
utilruntime.HandleError(fmt.Errorf("starting metrics server failed: %v", err))
}
}, 5*time.Second, utilwait.NeverStop)
}
func serveHealthz(hz healthcheck.ProxierHealthUpdater) {
go utilwait.Until(func() {
err := hz.Run()
if err != nil {
// For historical reasons we do not abort on errors here. We may
// change that in the future.
klog.Errorf("healthz server failed: %v", err)
} else {
klog.Errorf("healthz server returned without error")
}
}, 5*time.Second, utilwait.NeverStop)
}