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kube-proxy iptables test number of generated iptables rules
kube-proxy generates iptables rules to forward traffic from Services to Endpoints kube-proxy uses iptables-restore to configure the rules atomically, however, this has the downside that large number of rules take a long time to be processed, causing disruption. There are different parameters than influence the number of rules generated: - ServiceType - Number of Services - Number of Endpoints per Service This test will fail when the number of rules change, so the person that is modifying the code can have feedback about the performance impact on their changes. It also runs multiple number of rules test cases to check if the number of rules grows linearly.
This commit is contained in:
Antonio Ojea
parent
5f40fb05cb
commit
3cb63833ff
438
pkg/proxy/iptables/number_generated_rules_test.go
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438
pkg/proxy/iptables/number_generated_rules_test.go
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@ -0,0 +1,438 @@
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/*
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Copyright 2022 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 iptables
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import (
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"fmt"
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"testing"
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"time"
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v1 "k8s.io/api/core/v1"
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discovery "k8s.io/api/discovery/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/intstr"
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iptablestest "k8s.io/kubernetes/pkg/util/iptables/testing"
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netutils "k8s.io/utils/net"
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utilpointer "k8s.io/utils/pointer"
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)
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// kube-proxy generates iptables rules to forward traffic from Services to Endpoints
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// kube-proxy uses iptables-restore to configure the rules atomically, however,
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// this has the downside that large number of rules take a long time to be processed,
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// causing disruption.
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// There are different parameters than influence the number of rules generated:
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// - ServiceType
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// - Number of Services
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// - Number of Endpoints per Service
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// This test will fail when the number of rules change, so the person
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// that is modifying the code can have feedback about the performance impact
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// on their changes. It also runs multiple number of rules test cases to check
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// if the number of rules grows linearly.
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func TestNumberIptablesRules(t *testing.T) {
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testCases := []struct {
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name string
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epsFunc func(eps *discovery.EndpointSlice)
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svcFunc func(svc *v1.Service)
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services int
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epPerService int
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expectedFilterRules int
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expectedNatRules int
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}{
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{
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name: "0 Services 0 EndpointsPerService - ClusterIP",
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services: 0,
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epPerService: 0,
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expectedFilterRules: 3,
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expectedNatRules: 5,
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},
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{
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name: "1 Services 0 EndpointPerService - ClusterIP",
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services: 1,
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epPerService: 0,
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expectedFilterRules: 4,
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expectedNatRules: 5,
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},
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{
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name: "1 Services 1 EndpointPerService - ClusterIP",
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services: 1,
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epPerService: 1,
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expectedFilterRules: 3,
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expectedNatRules: 10,
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},
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{
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name: "1 Services 2 EndpointPerService - ClusterIP",
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services: 1,
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epPerService: 2,
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expectedFilterRules: 3,
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expectedNatRules: 13,
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},
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{
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name: "1 Services 10 EndpointPerService - ClusterIP",
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services: 1,
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epPerService: 10,
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expectedFilterRules: 3,
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expectedNatRules: 37,
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},
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{
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name: "10 Services 0 EndpointsPerService - ClusterIP",
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services: 10,
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epPerService: 0,
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expectedFilterRules: 13,
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expectedNatRules: 5,
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},
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{
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name: "10 Services 1 EndpointPerService - ClusterIP",
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services: 10,
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epPerService: 1,
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expectedFilterRules: 3,
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expectedNatRules: 55,
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},
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{
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name: "10 Services 2 EndpointPerService - ClusterIP",
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services: 10,
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epPerService: 2,
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expectedFilterRules: 3,
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expectedNatRules: 85,
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},
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{
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name: "10 Services 10 EndpointPerService - ClusterIP",
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services: 10,
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epPerService: 10,
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expectedFilterRules: 3,
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expectedNatRules: 325,
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},
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{
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name: "0 Services 0 EndpointsPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 0,
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epPerService: 0,
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expectedFilterRules: 3,
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expectedNatRules: 5,
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},
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{
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name: "1 Services 0 EndpointPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 1,
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epPerService: 0,
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expectedFilterRules: 7,
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expectedNatRules: 5,
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},
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{
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name: "1 Services 1 EndpointPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 1,
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epPerService: 1,
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expectedFilterRules: 3,
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expectedNatRules: 17,
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},
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{
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name: "1 Services 2 EndpointPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 1,
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epPerService: 2,
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expectedFilterRules: 3,
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expectedNatRules: 20,
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},
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{
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name: "1 Services 10 EndpointPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 1,
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epPerService: 10,
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expectedFilterRules: 3,
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expectedNatRules: 44,
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},
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{
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name: "10 Services 0 EndpointsPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 10,
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epPerService: 0,
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expectedFilterRules: 43,
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expectedNatRules: 5,
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},
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{
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name: "10 Services 1 EndpointPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 10,
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epPerService: 1,
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expectedFilterRules: 3,
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expectedNatRules: 125,
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},
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{
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name: "10 Services 2 EndpointPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 10,
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epPerService: 2,
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expectedFilterRules: 3,
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expectedNatRules: 155,
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},
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{
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name: "10 Services 10 EndpointPerService - LoadBalancer",
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svcFunc: func(svc *v1.Service) {
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svc.Spec.Type = v1.ServiceTypeLoadBalancer
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svc.Spec.ExternalIPs = []string{"1.2.3.4"}
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svc.Spec.LoadBalancerSourceRanges = []string{" 1.2.3.4/28"}
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svc.Status.LoadBalancer.Ingress = []v1.LoadBalancerIngress{{
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IP: "1.2.3.4",
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}}
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},
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services: 10,
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epPerService: 10,
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expectedFilterRules: 3,
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expectedNatRules: 395,
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},
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}
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for _, test := range testCases {
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t.Run(test.name, func(t *testing.T) {
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ipt := iptablestest.NewFake()
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fp := NewFakeProxier(ipt)
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svcs, eps := generateServiceEndpoints(test.services, test.epPerService, test.epsFunc, test.svcFunc)
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makeServiceMap(fp, svcs...)
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populateEndpointSlices(fp, eps...)
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now := time.Now()
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fp.syncProxyRules()
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t.Logf("time to sync rule: %v", time.Since(now))
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t.Logf("iptables data size: %d bytes", fp.iptablesData.Len())
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if fp.filterRules.Lines() != test.expectedFilterRules {
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t.Errorf("expected number of Filter rules: %d, got: %d", test.expectedFilterRules, fp.filterRules.Lines())
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}
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if fp.natRules.Lines() != test.expectedNatRules {
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t.Errorf("expected number of NAT rules: %d, got: %d", test.expectedNatRules, fp.natRules.Lines())
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}
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// print generated iptables data
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// t.Logf("Generated rules:\n %s", fp.iptablesData.String())
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})
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}
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}
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func Test_generateServiceEndpoints(t *testing.T) {
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testCases := []struct {
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name string
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services int
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epPerService int
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svcType v1.ServiceType
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}{
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{
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name: "Generate 10 Services with 10 Endpoints per Service and LoadBalancer Type",
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services: 10,
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epPerService: 10,
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svcType: v1.ServiceTypeLoadBalancer,
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},
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{
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name: "Generate 10 Services with 20 Endpoints per Service and NodePort Type",
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services: 10,
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epPerService: 20,
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svcType: v1.ServiceTypeNodePort,
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},
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}
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for _, test := range testCases {
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t.Run(test.name, func(t *testing.T) {
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// test the function to mutate services
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svcFunc := func(svc *v1.Service) {
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svc.Spec.Type = test.svcType
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}
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// test the function to mutate endpoint slices
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epsFunc := func(eps *discovery.EndpointSlice) {
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for i := range eps.Endpoints {
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nodeName := fmt.Sprintf("node-%d", i)
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eps.Endpoints[i].NodeName = &nodeName
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}
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}
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svcs, eps := generateServiceEndpoints(test.services, test.epPerService, epsFunc, svcFunc)
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if len(svcs) != test.services {
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t.Fatalf("expected %d service, received %d", test.services, len(svcs))
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}
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if len(eps) != test.services {
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t.Fatalf("expected %d endpoint slice , received %d", test.services, len(eps))
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}
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for i := 0; i < test.services; i++ {
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if svcs[i].Spec.Type != test.svcType {
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t.Fatalf("expected Service Type %s, got %s", test.svcType, svcs[i].Spec.Type)
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}
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if eps[i].ObjectMeta.Labels[discovery.LabelServiceName] != svcs[i].Name {
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t.Fatalf("endpoint slice reference %s instead of Service %s", eps[i].ObjectMeta.Labels[discovery.LabelServiceName], svcs[i].Name)
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}
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if len(eps[i].Endpoints) != test.epPerService {
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t.Fatalf("expected %d endpoints per slice , received %d", test.epPerService, len(eps[i].Endpoints))
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}
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for j := 0; j < test.epPerService; j++ {
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nodeName := fmt.Sprintf("node-%d", j)
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if *eps[i].Endpoints[j].NodeName != nodeName {
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t.Errorf("Endpoint %d on EndpointSlice %d expected Nodename %s, got %s", j, i, nodeName, *eps[i].Endpoints[j].NodeName)
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}
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}
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}
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})
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}
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}
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// generateServiceEndpoints generate Services with the Type specified and it creates N Endpoints per Service
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func generateServiceEndpoints(nServices, nEndpoints int, epsFunc func(eps *discovery.EndpointSlice), svcFunc func(svc *v1.Service)) ([]*v1.Service, []*discovery.EndpointSlice) {
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services := make([]*v1.Service, nServices)
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endpointSlices := make([]*discovery.EndpointSlice, nServices)
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// base parameters
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basePort := 80
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base := netutils.BigForIP(netutils.ParseIPSloppy("10.0.0.1"))
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// generate a base endpoint slice object
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baseEp := netutils.BigForIP(netutils.ParseIPSloppy("172.16.0.1"))
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epPort := 8080
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tcpProtocol := v1.ProtocolTCP
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eps := &discovery.EndpointSlice{
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ObjectMeta: metav1.ObjectMeta{
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Name: "ep",
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Namespace: "namespace",
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},
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AddressType: discovery.AddressTypeIPv4,
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Endpoints: []discovery.Endpoint{},
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Ports: []discovery.EndpointPort{{
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Name: utilpointer.StringPtr(fmt.Sprintf("%d", epPort)),
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Port: utilpointer.Int32(int32(epPort)),
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Protocol: &tcpProtocol,
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}},
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}
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for j := 0; j < nEndpoints; j++ {
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ipEp := netutils.AddIPOffset(baseEp, j)
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eps.Endpoints = append(eps.Endpoints, discovery.Endpoint{
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Addresses: []string{ipEp.String()},
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})
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}
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if epsFunc != nil {
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epsFunc(eps)
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}
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// generate a base service object
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svc := &v1.Service{
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ObjectMeta: metav1.ObjectMeta{
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Name: "svc",
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Namespace: "namespace",
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},
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Spec: v1.ServiceSpec{
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Type: v1.ServiceTypeClusterIP,
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},
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}
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if svcFunc != nil {
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svcFunc(svc)
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}
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// Create the Services and associate and endpoint slice object to each one
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for i := 0; i < nServices; i++ {
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ip := netutils.AddIPOffset(base, i)
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services[i] = svc.DeepCopy()
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services[i].Name = fmt.Sprintf("svc%d", i)
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services[i].Spec.ClusterIP = ip.String()
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services[i].Spec.Ports = []v1.ServicePort{
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{
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Name: fmt.Sprintf("%d", epPort),
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Protocol: v1.ProtocolTCP,
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Port: int32(basePort + i),
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TargetPort: intstr.FromInt(epPort),
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},
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}
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if svc.Spec.Type == v1.ServiceTypeNodePort || svc.Spec.Type == v1.ServiceTypeLoadBalancer {
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services[i].Spec.Ports[0].NodePort = int32(30000 + i)
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}
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if svc.Spec.Type == v1.ServiceTypeLoadBalancer {
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services[i].Spec.HealthCheckNodePort = int32(32000 + nServices + i)
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}
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endpointSlices[i] = eps.DeepCopy()
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endpointSlices[i].Name = services[i].Name
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endpointSlices[i].ObjectMeta.Labels = map[string]string{
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discovery.LabelServiceName: services[i].Name,
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}
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}
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return services, endpointSlices
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}
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