a38b9363ec
Kube/proxy, in NodeCIDR local detector mode, uses the node.Spec.PodCIDRs field to build the Services iptables rules. The Node object depends on the kubelet, but if kube-proxy runs as a static pods or as a standalone binary, it is not possible to guarantee that the values obtained at bootsrap are valid, causing traffic outages. Kube-proxy has to react on node changes to avoid this problems, it simply restarts if detect that the node PodCIDRs have changed. In case that the Node has been deleted, kube-proxy will only log an error and keep working, since it may break graceful shutdowns of the node.
554 lines
19 KiB
Go
554 lines
19 KiB
Go
//go:build !windows
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// +build !windows
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/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package app does all of the work necessary to configure and run a
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// Kubernetes app process.
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package app
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import (
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"context"
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"errors"
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"fmt"
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goruntime "runtime"
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"strings"
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"time"
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"github.com/google/cadvisor/machine"
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"github.com/google/cadvisor/utils/sysfs"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/tools/events"
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"k8s.io/apimachinery/pkg/fields"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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clientset "k8s.io/client-go/kubernetes"
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toolswatch "k8s.io/client-go/tools/watch"
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"k8s.io/component-base/configz"
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"k8s.io/component-base/metrics"
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utilsysctl "k8s.io/component-helpers/node/util/sysctl"
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"k8s.io/kubernetes/pkg/proxy"
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proxyconfigapi "k8s.io/kubernetes/pkg/proxy/apis/config"
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"k8s.io/kubernetes/pkg/proxy/apis/config/scheme"
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"k8s.io/kubernetes/pkg/proxy/healthcheck"
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"k8s.io/kubernetes/pkg/proxy/iptables"
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"k8s.io/kubernetes/pkg/proxy/ipvs"
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proxymetrics "k8s.io/kubernetes/pkg/proxy/metrics"
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proxyutiliptables "k8s.io/kubernetes/pkg/proxy/util/iptables"
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utilipset "k8s.io/kubernetes/pkg/util/ipset"
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utiliptables "k8s.io/kubernetes/pkg/util/iptables"
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utilipvs "k8s.io/kubernetes/pkg/util/ipvs"
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utilnode "k8s.io/kubernetes/pkg/util/node"
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"k8s.io/utils/exec"
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netutils "k8s.io/utils/net"
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"k8s.io/klog/v2"
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)
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// timeoutForNodePodCIDR is the time to wait for allocators to assign a PodCIDR to the
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// node after it is registered.
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var timeoutForNodePodCIDR = 5 * time.Minute
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// NewProxyServer returns a new ProxyServer.
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func NewProxyServer(o *Options) (*ProxyServer, error) {
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return newProxyServer(o.config, o.master)
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}
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func newProxyServer(
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config *proxyconfigapi.KubeProxyConfiguration,
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master string) (*ProxyServer, error) {
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if config == nil {
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return nil, errors.New("config is required")
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}
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if c, err := configz.New(proxyconfigapi.GroupName); err == nil {
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c.Set(config)
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} else {
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return nil, fmt.Errorf("unable to register configz: %s", err)
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}
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var ipvsInterface utilipvs.Interface
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var ipsetInterface utilipset.Interface
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if len(config.ShowHiddenMetricsForVersion) > 0 {
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metrics.SetShowHidden()
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}
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hostname, err := utilnode.GetHostname(config.HostnameOverride)
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if err != nil {
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return nil, err
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}
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client, eventClient, err := createClients(config.ClientConnection, master)
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if err != nil {
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return nil, err
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}
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nodeIP := detectNodeIP(client, hostname, config.BindAddress)
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klog.InfoS("Detected node IP", "address", nodeIP.String())
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// Create event recorder
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eventBroadcaster := events.NewBroadcaster(&events.EventSinkImpl{Interface: client.EventsV1()})
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recorder := eventBroadcaster.NewRecorder(scheme.Scheme, "kube-proxy")
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nodeRef := &v1.ObjectReference{
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Kind: "Node",
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Name: hostname,
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UID: types.UID(hostname),
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Namespace: "",
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}
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var healthzServer healthcheck.ProxierHealthUpdater
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if len(config.HealthzBindAddress) > 0 {
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healthzServer = healthcheck.NewProxierHealthServer(config.HealthzBindAddress, 2*config.IPTables.SyncPeriod.Duration, recorder, nodeRef)
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}
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var proxier proxy.Provider
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var detectLocalMode proxyconfigapi.LocalMode
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proxyMode := getProxyMode(config.Mode)
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detectLocalMode, err = getDetectLocalMode(config)
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if err != nil {
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return nil, fmt.Errorf("cannot determine detect-local-mode: %v", err)
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}
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var nodeInfo *v1.Node
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if detectLocalMode == proxyconfigapi.LocalModeNodeCIDR {
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klog.InfoS("Watching for node, awaiting podCIDR allocation", "hostname", hostname)
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nodeInfo, err = waitForPodCIDR(client, hostname)
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if err != nil {
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return nil, err
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}
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klog.InfoS("NodeInfo", "PodCIDR", nodeInfo.Spec.PodCIDR, "PodCIDRs", nodeInfo.Spec.PodCIDRs)
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}
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klog.V(2).InfoS("DetectLocalMode", "LocalMode", string(detectLocalMode))
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primaryProtocol := utiliptables.ProtocolIPv4
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if netutils.IsIPv6(nodeIP) {
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primaryProtocol = utiliptables.ProtocolIPv6
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}
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execer := exec.New()
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iptInterface := utiliptables.New(execer, primaryProtocol)
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var ipt [2]utiliptables.Interface
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dualStack := true // While we assume that node supports, we do further checks below
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// Create iptables handlers for both families, one is already created
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// Always ordered as IPv4, IPv6
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if primaryProtocol == utiliptables.ProtocolIPv4 {
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ipt[0] = iptInterface
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ipt[1] = utiliptables.New(execer, utiliptables.ProtocolIPv6)
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} else {
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ipt[0] = utiliptables.New(execer, utiliptables.ProtocolIPv4)
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ipt[1] = iptInterface
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}
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for _, perFamilyIpt := range ipt {
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if !perFamilyIpt.Present() {
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klog.V(0).InfoS("kube-proxy running in single-stack mode, this ipFamily is not supported", "ipFamily", perFamilyIpt.Protocol())
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dualStack = false
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}
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}
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if proxyMode == proxyconfigapi.ProxyModeIPTables {
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klog.InfoS("Using iptables Proxier")
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if config.IPTables.MasqueradeBit == nil {
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// MasqueradeBit must be specified or defaulted.
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return nil, fmt.Errorf("unable to read IPTables MasqueradeBit from config")
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}
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if dualStack {
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klog.InfoS("kube-proxy running in dual-stack mode", "ipFamily", iptInterface.Protocol())
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klog.InfoS("Creating dualStackProxier for iptables")
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// Always ordered to match []ipt
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var localDetectors [2]proxyutiliptables.LocalTrafficDetector
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localDetectors, err = getDualStackLocalDetectorTuple(detectLocalMode, config, ipt, nodeInfo)
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if err != nil {
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return nil, fmt.Errorf("unable to create proxier: %v", err)
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}
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// TODO this has side effects that should only happen when Run() is invoked.
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proxier, err = iptables.NewDualStackProxier(
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ipt,
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utilsysctl.New(),
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execer,
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config.IPTables.SyncPeriod.Duration,
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config.IPTables.MinSyncPeriod.Duration,
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config.IPTables.MasqueradeAll,
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int(*config.IPTables.MasqueradeBit),
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localDetectors,
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hostname,
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nodeIPTuple(config.BindAddress),
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recorder,
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healthzServer,
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config.NodePortAddresses,
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)
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} else {
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// Create a single-stack proxier if and only if the node does not support dual-stack (i.e, no iptables support).
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var localDetector proxyutiliptables.LocalTrafficDetector
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localDetector, err = getLocalDetector(detectLocalMode, config, iptInterface, nodeInfo)
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if err != nil {
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return nil, fmt.Errorf("unable to create proxier: %v", err)
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}
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// TODO this has side effects that should only happen when Run() is invoked.
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proxier, err = iptables.NewProxier(
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iptInterface,
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utilsysctl.New(),
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execer,
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config.IPTables.SyncPeriod.Duration,
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config.IPTables.MinSyncPeriod.Duration,
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config.IPTables.MasqueradeAll,
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int(*config.IPTables.MasqueradeBit),
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localDetector,
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hostname,
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nodeIP,
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recorder,
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healthzServer,
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config.NodePortAddresses,
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)
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}
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if err != nil {
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return nil, fmt.Errorf("unable to create proxier: %v", err)
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}
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proxymetrics.RegisterMetrics()
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} else if proxyMode == proxyconfigapi.ProxyModeIPVS {
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kernelHandler := ipvs.NewLinuxKernelHandler()
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ipsetInterface = utilipset.New(execer)
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if err := ipvs.CanUseIPVSProxier(kernelHandler, ipsetInterface, config.IPVS.Scheduler); err != nil {
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return nil, fmt.Errorf("can't use the IPVS proxier: %v", err)
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}
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ipvsInterface = utilipvs.New()
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klog.InfoS("Using ipvs Proxier")
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if dualStack {
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klog.InfoS("Creating dualStackProxier for ipvs")
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nodeIPs := nodeIPTuple(config.BindAddress)
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// Always ordered to match []ipt
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var localDetectors [2]proxyutiliptables.LocalTrafficDetector
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localDetectors, err = getDualStackLocalDetectorTuple(detectLocalMode, config, ipt, nodeInfo)
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if err != nil {
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return nil, fmt.Errorf("unable to create proxier: %v", err)
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}
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proxier, err = ipvs.NewDualStackProxier(
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ipt,
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ipvsInterface,
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ipsetInterface,
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utilsysctl.New(),
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execer,
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config.IPVS.SyncPeriod.Duration,
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config.IPVS.MinSyncPeriod.Duration,
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config.IPVS.ExcludeCIDRs,
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config.IPVS.StrictARP,
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config.IPVS.TCPTimeout.Duration,
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config.IPVS.TCPFinTimeout.Duration,
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config.IPVS.UDPTimeout.Duration,
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config.IPTables.MasqueradeAll,
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int(*config.IPTables.MasqueradeBit),
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localDetectors,
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hostname,
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nodeIPs,
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recorder,
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healthzServer,
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config.IPVS.Scheduler,
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config.NodePortAddresses,
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kernelHandler,
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)
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} else {
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var localDetector proxyutiliptables.LocalTrafficDetector
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localDetector, err = getLocalDetector(detectLocalMode, config, iptInterface, nodeInfo)
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if err != nil {
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return nil, fmt.Errorf("unable to create proxier: %v", err)
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}
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proxier, err = ipvs.NewProxier(
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iptInterface,
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ipvsInterface,
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ipsetInterface,
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utilsysctl.New(),
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execer,
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config.IPVS.SyncPeriod.Duration,
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config.IPVS.MinSyncPeriod.Duration,
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config.IPVS.ExcludeCIDRs,
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config.IPVS.StrictARP,
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config.IPVS.TCPTimeout.Duration,
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config.IPVS.TCPFinTimeout.Duration,
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config.IPVS.UDPTimeout.Duration,
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config.IPTables.MasqueradeAll,
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int(*config.IPTables.MasqueradeBit),
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localDetector,
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hostname,
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nodeIP,
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recorder,
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healthzServer,
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config.IPVS.Scheduler,
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config.NodePortAddresses,
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kernelHandler,
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)
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}
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if err != nil {
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return nil, fmt.Errorf("unable to create proxier: %v", err)
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}
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proxymetrics.RegisterMetrics()
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}
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return &ProxyServer{
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Client: client,
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EventClient: eventClient,
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IptInterface: iptInterface,
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IpvsInterface: ipvsInterface,
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IpsetInterface: ipsetInterface,
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execer: execer,
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Proxier: proxier,
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Broadcaster: eventBroadcaster,
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Recorder: recorder,
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ConntrackConfiguration: config.Conntrack,
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Conntracker: &realConntracker{},
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ProxyMode: proxyMode,
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NodeRef: nodeRef,
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MetricsBindAddress: config.MetricsBindAddress,
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BindAddressHardFail: config.BindAddressHardFail,
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EnableProfiling: config.EnableProfiling,
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OOMScoreAdj: config.OOMScoreAdj,
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ConfigSyncPeriod: config.ConfigSyncPeriod.Duration,
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HealthzServer: healthzServer,
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localDetectorMode: detectLocalMode,
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}, nil
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}
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func waitForPodCIDR(client clientset.Interface, nodeName string) (*v1.Node, error) {
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// since allocators can assign the podCIDR after the node registers, we do a watch here to wait
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// for podCIDR to be assigned, instead of assuming that the Get() on startup will have it.
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ctx, cancelFunc := context.WithTimeout(context.TODO(), timeoutForNodePodCIDR)
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defer cancelFunc()
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fieldSelector := fields.OneTermEqualSelector("metadata.name", nodeName).String()
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lw := &cache.ListWatch{
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ListFunc: func(options metav1.ListOptions) (object runtime.Object, e error) {
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options.FieldSelector = fieldSelector
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return client.CoreV1().Nodes().List(ctx, options)
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},
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WatchFunc: func(options metav1.ListOptions) (i watch.Interface, e error) {
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options.FieldSelector = fieldSelector
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return client.CoreV1().Nodes().Watch(ctx, options)
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},
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}
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condition := func(event watch.Event) (bool, error) {
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if n, ok := event.Object.(*v1.Node); ok {
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return n.Spec.PodCIDR != "" && len(n.Spec.PodCIDRs) > 0, nil
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}
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return false, fmt.Errorf("event object not of type Node")
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}
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evt, err := toolswatch.UntilWithSync(ctx, lw, &v1.Node{}, nil, condition)
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if err != nil {
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return nil, fmt.Errorf("timeout waiting for PodCIDR allocation to configure detect-local-mode %v: %v", proxyconfigapi.LocalModeNodeCIDR, err)
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}
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if n, ok := evt.Object.(*v1.Node); ok {
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return n, nil
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}
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return nil, fmt.Errorf("event object not of type node")
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}
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func detectNumCPU() int {
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// try get numCPU from /sys firstly due to a known issue (https://github.com/kubernetes/kubernetes/issues/99225)
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_, numCPU, err := machine.GetTopology(sysfs.NewRealSysFs())
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if err != nil || numCPU < 1 {
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return goruntime.NumCPU()
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}
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return numCPU
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}
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func getDetectLocalMode(config *proxyconfigapi.KubeProxyConfiguration) (proxyconfigapi.LocalMode, error) {
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mode := config.DetectLocalMode
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switch mode {
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case proxyconfigapi.LocalModeClusterCIDR, proxyconfigapi.LocalModeNodeCIDR, proxyconfigapi.LocalModeBridgeInterface, proxyconfigapi.LocalModeInterfaceNamePrefix:
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return mode, nil
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default:
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if strings.TrimSpace(mode.String()) != "" {
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return mode, fmt.Errorf("unknown detect-local-mode: %v", mode)
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}
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klog.V(4).InfoS("Defaulting detect-local-mode", "LocalModeClusterCIDR", string(proxyconfigapi.LocalModeClusterCIDR))
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return proxyconfigapi.LocalModeClusterCIDR, nil
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}
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}
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func getLocalDetector(mode proxyconfigapi.LocalMode, config *proxyconfigapi.KubeProxyConfiguration, ipt utiliptables.Interface, nodeInfo *v1.Node) (proxyutiliptables.LocalTrafficDetector, error) {
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switch mode {
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case proxyconfigapi.LocalModeClusterCIDR:
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if len(strings.TrimSpace(config.ClusterCIDR)) == 0 {
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klog.InfoS("Detect-local-mode set to ClusterCIDR, but no cluster CIDR defined")
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break
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}
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return proxyutiliptables.NewDetectLocalByCIDR(config.ClusterCIDR, ipt)
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case proxyconfigapi.LocalModeNodeCIDR:
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if len(strings.TrimSpace(nodeInfo.Spec.PodCIDR)) == 0 {
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klog.InfoS("Detect-local-mode set to NodeCIDR, but no PodCIDR defined at node")
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break
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}
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return proxyutiliptables.NewDetectLocalByCIDR(nodeInfo.Spec.PodCIDR, ipt)
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case proxyconfigapi.LocalModeBridgeInterface:
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if len(strings.TrimSpace(config.DetectLocal.BridgeInterface)) == 0 {
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return nil, fmt.Errorf("Detect-local-mode set to BridgeInterface, but no bridge-interface-name %s is defined", config.DetectLocal.BridgeInterface)
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}
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return proxyutiliptables.NewDetectLocalByBridgeInterface(config.DetectLocal.BridgeInterface)
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case proxyconfigapi.LocalModeInterfaceNamePrefix:
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if len(strings.TrimSpace(config.DetectLocal.InterfaceNamePrefix)) == 0 {
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return nil, fmt.Errorf("Detect-local-mode set to InterfaceNamePrefix, but no interface-prefix %s is defined", config.DetectLocal.InterfaceNamePrefix)
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}
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return proxyutiliptables.NewDetectLocalByInterfaceNamePrefix(config.DetectLocal.InterfaceNamePrefix)
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}
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klog.InfoS("Defaulting to no-op detect-local", "detect-local-mode", string(mode))
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return proxyutiliptables.NewNoOpLocalDetector(), nil
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}
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func getDualStackLocalDetectorTuple(mode proxyconfigapi.LocalMode, config *proxyconfigapi.KubeProxyConfiguration, ipt [2]utiliptables.Interface, nodeInfo *v1.Node) ([2]proxyutiliptables.LocalTrafficDetector, error) {
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var err error
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localDetectors := [2]proxyutiliptables.LocalTrafficDetector{proxyutiliptables.NewNoOpLocalDetector(), proxyutiliptables.NewNoOpLocalDetector()}
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switch mode {
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case proxyconfigapi.LocalModeClusterCIDR:
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if len(strings.TrimSpace(config.ClusterCIDR)) == 0 {
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klog.InfoS("Detect-local-mode set to ClusterCIDR, but no cluster CIDR defined")
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break
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}
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clusterCIDRs := cidrTuple(config.ClusterCIDR)
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if len(strings.TrimSpace(clusterCIDRs[0])) == 0 {
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klog.InfoS("Detect-local-mode set to ClusterCIDR, but no IPv4 cluster CIDR defined, defaulting to no-op detect-local for IPv4")
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} else {
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localDetectors[0], err = proxyutiliptables.NewDetectLocalByCIDR(clusterCIDRs[0], ipt[0])
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if err != nil { // don't loose the original error
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return localDetectors, err
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}
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}
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if len(strings.TrimSpace(clusterCIDRs[1])) == 0 {
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|
klog.InfoS("Detect-local-mode set to ClusterCIDR, but no IPv6 cluster CIDR defined, , defaulting to no-op detect-local for IPv6")
|
|
} else {
|
|
localDetectors[1], err = proxyutiliptables.NewDetectLocalByCIDR(clusterCIDRs[1], ipt[1])
|
|
}
|
|
return localDetectors, err
|
|
case proxyconfigapi.LocalModeNodeCIDR:
|
|
if nodeInfo == nil || len(strings.TrimSpace(nodeInfo.Spec.PodCIDR)) == 0 {
|
|
klog.InfoS("No node info available to configure detect-local-mode NodeCIDR")
|
|
break
|
|
}
|
|
// localDetectors, like ipt, need to be of the order [IPv4, IPv6], but PodCIDRs is setup so that PodCIDRs[0] == PodCIDR.
|
|
// so have to handle the case where PodCIDR can be IPv6 and set that to localDetectors[1]
|
|
if netutils.IsIPv6CIDRString(nodeInfo.Spec.PodCIDR) {
|
|
localDetectors[1], err = proxyutiliptables.NewDetectLocalByCIDR(nodeInfo.Spec.PodCIDR, ipt[1])
|
|
if err != nil {
|
|
return localDetectors, err
|
|
}
|
|
if len(nodeInfo.Spec.PodCIDRs) > 1 {
|
|
localDetectors[0], err = proxyutiliptables.NewDetectLocalByCIDR(nodeInfo.Spec.PodCIDRs[1], ipt[0])
|
|
}
|
|
} else {
|
|
localDetectors[0], err = proxyutiliptables.NewDetectLocalByCIDR(nodeInfo.Spec.PodCIDR, ipt[0])
|
|
if err != nil {
|
|
return localDetectors, err
|
|
}
|
|
if len(nodeInfo.Spec.PodCIDRs) > 1 {
|
|
localDetectors[1], err = proxyutiliptables.NewDetectLocalByCIDR(nodeInfo.Spec.PodCIDRs[1], ipt[1])
|
|
}
|
|
}
|
|
return localDetectors, err
|
|
case proxyconfigapi.LocalModeBridgeInterface, proxyconfigapi.LocalModeInterfaceNamePrefix:
|
|
localDetector, err := getLocalDetector(mode, config, ipt[0], nodeInfo)
|
|
if err == nil {
|
|
localDetectors[0] = localDetector
|
|
localDetectors[1] = localDetector
|
|
}
|
|
return localDetectors, err
|
|
default:
|
|
klog.InfoS("Unknown detect-local-mode", "detect-local-mode", mode)
|
|
}
|
|
klog.InfoS("Defaulting to no-op detect-local", "detect-local-mode", string(mode))
|
|
return localDetectors, nil
|
|
}
|
|
|
|
// cidrTuple takes a comma separated list of CIDRs and return a tuple (ipv4cidr,ipv6cidr)
|
|
// The returned tuple is guaranteed to have the order (ipv4,ipv6) and if no cidr from a family is found an
|
|
// empty string "" is inserted.
|
|
func cidrTuple(cidrList string) [2]string {
|
|
cidrs := [2]string{"", ""}
|
|
foundIPv4 := false
|
|
foundIPv6 := false
|
|
|
|
for _, cidr := range strings.Split(cidrList, ",") {
|
|
if netutils.IsIPv6CIDRString(cidr) && !foundIPv6 {
|
|
cidrs[1] = cidr
|
|
foundIPv6 = true
|
|
} else if !foundIPv4 {
|
|
cidrs[0] = cidr
|
|
foundIPv4 = true
|
|
}
|
|
if foundIPv6 && foundIPv4 {
|
|
break
|
|
}
|
|
}
|
|
|
|
return cidrs
|
|
}
|
|
|
|
func getProxyMode(proxyMode proxyconfigapi.ProxyMode) proxyconfigapi.ProxyMode {
|
|
if proxyMode == "" {
|
|
klog.InfoS("Using iptables proxy")
|
|
return proxyconfigapi.ProxyModeIPTables
|
|
} else {
|
|
return proxyMode
|
|
}
|
|
}
|
|
|
|
// cleanupAndExit remove iptables rules and ipset/ipvs rules
|
|
func cleanupAndExit() error {
|
|
execer := exec.New()
|
|
|
|
// cleanup IPv6 and IPv4 iptables rules, regardless of current configuration
|
|
ipts := []utiliptables.Interface{
|
|
utiliptables.New(execer, utiliptables.ProtocolIPv4),
|
|
utiliptables.New(execer, utiliptables.ProtocolIPv6),
|
|
}
|
|
|
|
ipsetInterface := utilipset.New(execer)
|
|
ipvsInterface := utilipvs.New()
|
|
|
|
var encounteredError bool
|
|
for _, ipt := range ipts {
|
|
encounteredError = iptables.CleanupLeftovers(ipt) || encounteredError
|
|
encounteredError = ipvs.CleanupLeftovers(ipvsInterface, ipt, ipsetInterface) || encounteredError
|
|
}
|
|
if encounteredError {
|
|
return errors.New("encountered an error while tearing down rules")
|
|
}
|
|
|
|
return nil
|
|
}
|