mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-08-06 09:36:58 +02:00
72b4b4f411
Currently, the minimum delay between 2 kubernetes events handling is hard-coded to 5s. This may cause higher synchronization rates and higher DNS provider API calls when handling an important number of kubernetes events at once. Give the opportunity to configure this delay so service owners can define the acceptable thresholds on their side
380 lines
14 KiB
Go
380 lines
14 KiB
Go
/*
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Copyright 2017 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 main
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import (
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"context"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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log "github.com/sirupsen/logrus"
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_ "k8s.io/client-go/plugin/pkg/client/auth"
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"sigs.k8s.io/external-dns/controller"
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"sigs.k8s.io/external-dns/endpoint"
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"sigs.k8s.io/external-dns/pkg/apis/externaldns"
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"sigs.k8s.io/external-dns/pkg/apis/externaldns/validation"
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"sigs.k8s.io/external-dns/plan"
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"sigs.k8s.io/external-dns/provider"
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"sigs.k8s.io/external-dns/provider/akamai"
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"sigs.k8s.io/external-dns/provider/alibabacloud"
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"sigs.k8s.io/external-dns/provider/aws"
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"sigs.k8s.io/external-dns/provider/awssd"
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"sigs.k8s.io/external-dns/provider/azure"
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"sigs.k8s.io/external-dns/provider/cloudflare"
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"sigs.k8s.io/external-dns/provider/coredns"
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"sigs.k8s.io/external-dns/provider/designate"
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"sigs.k8s.io/external-dns/provider/digitalocean"
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"sigs.k8s.io/external-dns/provider/dnsimple"
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"sigs.k8s.io/external-dns/provider/dyn"
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"sigs.k8s.io/external-dns/provider/exoscale"
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"sigs.k8s.io/external-dns/provider/godaddy"
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"sigs.k8s.io/external-dns/provider/google"
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"sigs.k8s.io/external-dns/provider/hetzner"
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"sigs.k8s.io/external-dns/provider/infoblox"
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"sigs.k8s.io/external-dns/provider/inmemory"
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"sigs.k8s.io/external-dns/provider/linode"
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"sigs.k8s.io/external-dns/provider/ns1"
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"sigs.k8s.io/external-dns/provider/oci"
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"sigs.k8s.io/external-dns/provider/ovh"
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"sigs.k8s.io/external-dns/provider/pdns"
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"sigs.k8s.io/external-dns/provider/rcode0"
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"sigs.k8s.io/external-dns/provider/rdns"
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"sigs.k8s.io/external-dns/provider/rfc2136"
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"sigs.k8s.io/external-dns/provider/scaleway"
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"sigs.k8s.io/external-dns/provider/transip"
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"sigs.k8s.io/external-dns/provider/ultradns"
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"sigs.k8s.io/external-dns/provider/vinyldns"
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"sigs.k8s.io/external-dns/provider/vultr"
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"sigs.k8s.io/external-dns/registry"
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"sigs.k8s.io/external-dns/source"
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)
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func main() {
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cfg := externaldns.NewConfig()
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if err := cfg.ParseFlags(os.Args[1:]); err != nil {
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log.Fatalf("flag parsing error: %v", err)
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}
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log.Infof("config: %s", cfg)
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if err := validation.ValidateConfig(cfg); err != nil {
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log.Fatalf("config validation failed: %v", err)
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}
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if cfg.LogFormat == "json" {
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log.SetFormatter(&log.JSONFormatter{})
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}
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if cfg.DryRun {
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log.Info("running in dry-run mode. No changes to DNS records will be made.")
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}
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ll, err := log.ParseLevel(cfg.LogLevel)
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if err != nil {
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log.Fatalf("failed to parse log level: %v", err)
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}
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log.SetLevel(ll)
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ctx, cancel := context.WithCancel(context.Background())
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go serveMetrics(cfg.MetricsAddress)
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go handleSigterm(cancel)
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// Create a source.Config from the flags passed by the user.
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sourceCfg := &source.Config{
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Namespace: cfg.Namespace,
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AnnotationFilter: cfg.AnnotationFilter,
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LabelFilter: cfg.LabelFilter,
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FQDNTemplate: cfg.FQDNTemplate,
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CombineFQDNAndAnnotation: cfg.CombineFQDNAndAnnotation,
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IgnoreHostnameAnnotation: cfg.IgnoreHostnameAnnotation,
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IgnoreIngressTLSSpec: cfg.IgnoreIngressTLSSpec,
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Compatibility: cfg.Compatibility,
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PublishInternal: cfg.PublishInternal,
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PublishHostIP: cfg.PublishHostIP,
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AlwaysPublishNotReadyAddresses: cfg.AlwaysPublishNotReadyAddresses,
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ConnectorServer: cfg.ConnectorSourceServer,
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CRDSourceAPIVersion: cfg.CRDSourceAPIVersion,
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CRDSourceKind: cfg.CRDSourceKind,
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KubeConfig: cfg.KubeConfig,
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APIServerURL: cfg.APIServerURL,
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ServiceTypeFilter: cfg.ServiceTypeFilter,
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CFAPIEndpoint: cfg.CFAPIEndpoint,
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CFUsername: cfg.CFUsername,
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CFPassword: cfg.CFPassword,
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ContourLoadBalancerService: cfg.ContourLoadBalancerService,
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SkipperRouteGroupVersion: cfg.SkipperRouteGroupVersion,
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RequestTimeout: cfg.RequestTimeout,
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}
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// Lookup all the selected sources by names and pass them the desired configuration.
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sources, err := source.ByNames(&source.SingletonClientGenerator{
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KubeConfig: cfg.KubeConfig,
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APIServerURL: cfg.APIServerURL,
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// If update events are enabled, disable timeout.
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RequestTimeout: func() time.Duration {
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if cfg.UpdateEvents {
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return 0
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}
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return cfg.RequestTimeout
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}(),
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}, cfg.Sources, sourceCfg)
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if err != nil {
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log.Fatal(err)
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}
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// Combine multiple sources into a single, deduplicated source.
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endpointsSource := source.NewDedupSource(source.NewMultiSource(sources))
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domainFilter := endpoint.NewDomainFilterWithExclusions(cfg.DomainFilter, cfg.ExcludeDomains)
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zoneNameFilter := endpoint.NewDomainFilter(cfg.ZoneNameFilter)
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zoneIDFilter := provider.NewZoneIDFilter(cfg.ZoneIDFilter)
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zoneTypeFilter := provider.NewZoneTypeFilter(cfg.AWSZoneType)
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zoneTagFilter := provider.NewZoneTagFilter(cfg.AWSZoneTagFilter)
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var p provider.Provider
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switch cfg.Provider {
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case "akamai":
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p, err = akamai.NewAkamaiProvider(
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akamai.AkamaiConfig{
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DomainFilter: domainFilter,
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ZoneIDFilter: zoneIDFilter,
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ServiceConsumerDomain: cfg.AkamaiServiceConsumerDomain,
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ClientToken: cfg.AkamaiClientToken,
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ClientSecret: cfg.AkamaiClientSecret,
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AccessToken: cfg.AkamaiAccessToken,
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EdgercPath: cfg.AkamaiEdgercPath,
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EdgercSection: cfg.AkamaiEdgercSection,
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DryRun: cfg.DryRun,
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}, nil)
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case "alibabacloud":
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p, err = alibabacloud.NewAlibabaCloudProvider(cfg.AlibabaCloudConfigFile, domainFilter, zoneIDFilter, cfg.AlibabaCloudZoneType, cfg.DryRun)
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case "aws":
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p, err = aws.NewAWSProvider(
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aws.AWSConfig{
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DomainFilter: domainFilter,
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ZoneIDFilter: zoneIDFilter,
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ZoneTypeFilter: zoneTypeFilter,
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ZoneTagFilter: zoneTagFilter,
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BatchChangeSize: cfg.AWSBatchChangeSize,
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BatchChangeInterval: cfg.AWSBatchChangeInterval,
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EvaluateTargetHealth: cfg.AWSEvaluateTargetHealth,
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AssumeRole: cfg.AWSAssumeRole,
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APIRetries: cfg.AWSAPIRetries,
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PreferCNAME: cfg.AWSPreferCNAME,
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DryRun: cfg.DryRun,
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ZoneCacheDuration: cfg.AWSZoneCacheDuration,
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},
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)
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case "aws-sd":
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// Check that only compatible Registry is used with AWS-SD
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if cfg.Registry != "noop" && cfg.Registry != "aws-sd" {
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log.Infof("Registry \"%s\" cannot be used with AWS Cloud Map. Switching to \"aws-sd\".", cfg.Registry)
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cfg.Registry = "aws-sd"
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}
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p, err = awssd.NewAWSSDProvider(domainFilter, cfg.AWSZoneType, cfg.AWSAssumeRole, cfg.DryRun)
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case "azure-dns", "azure":
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p, err = azure.NewAzureProvider(cfg.AzureConfigFile, domainFilter, zoneNameFilter, zoneIDFilter, cfg.AzureResourceGroup, cfg.AzureUserAssignedIdentityClientID, cfg.DryRun)
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case "azure-private-dns":
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p, err = azure.NewAzurePrivateDNSProvider(cfg.AzureConfigFile, domainFilter, zoneIDFilter, cfg.AzureResourceGroup, cfg.AzureUserAssignedIdentityClientID, cfg.DryRun)
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case "vinyldns":
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p, err = vinyldns.NewVinylDNSProvider(domainFilter, zoneIDFilter, cfg.DryRun)
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case "vultr":
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p, err = vultr.NewVultrProvider(domainFilter, cfg.DryRun)
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case "ultradns":
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p, err = ultradns.NewUltraDNSProvider(domainFilter, cfg.DryRun)
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case "cloudflare":
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p, err = cloudflare.NewCloudFlareProvider(domainFilter, zoneIDFilter, cfg.CloudflareZonesPerPage, cfg.CloudflareProxied, cfg.DryRun)
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case "rcodezero":
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p, err = rcode0.NewRcodeZeroProvider(domainFilter, cfg.DryRun, cfg.RcodezeroTXTEncrypt)
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case "google":
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p, err = google.NewGoogleProvider(ctx, cfg.GoogleProject, domainFilter, zoneIDFilter, cfg.GoogleBatchChangeSize, cfg.GoogleBatchChangeInterval, cfg.DryRun)
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case "digitalocean":
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p, err = digitalocean.NewDigitalOceanProvider(ctx, domainFilter, cfg.DryRun, cfg.DigitalOceanAPIPageSize)
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case "hetzner":
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p, err = hetzner.NewHetznerProvider(ctx, domainFilter, cfg.DryRun)
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case "ovh":
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p, err = ovh.NewOVHProvider(ctx, domainFilter, cfg.OVHEndpoint, cfg.OVHApiRateLimit, cfg.DryRun)
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case "linode":
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p, err = linode.NewLinodeProvider(domainFilter, cfg.DryRun, externaldns.Version)
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case "dnsimple":
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p, err = dnsimple.NewDnsimpleProvider(domainFilter, zoneIDFilter, cfg.DryRun)
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case "infoblox":
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p, err = infoblox.NewInfobloxProvider(
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infoblox.InfobloxConfig{
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DomainFilter: domainFilter,
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ZoneIDFilter: zoneIDFilter,
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Host: cfg.InfobloxGridHost,
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Port: cfg.InfobloxWapiPort,
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Username: cfg.InfobloxWapiUsername,
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Password: cfg.InfobloxWapiPassword,
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Version: cfg.InfobloxWapiVersion,
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SSLVerify: cfg.InfobloxSSLVerify,
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View: cfg.InfobloxView,
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MaxResults: cfg.InfobloxMaxResults,
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DryRun: cfg.DryRun,
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},
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)
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case "dyn":
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p, err = dyn.NewDynProvider(
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dyn.DynConfig{
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DomainFilter: domainFilter,
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ZoneIDFilter: zoneIDFilter,
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DryRun: cfg.DryRun,
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CustomerName: cfg.DynCustomerName,
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Username: cfg.DynUsername,
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Password: cfg.DynPassword,
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MinTTLSeconds: cfg.DynMinTTLSeconds,
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AppVersion: externaldns.Version,
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},
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)
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case "coredns", "skydns":
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p, err = coredns.NewCoreDNSProvider(domainFilter, cfg.CoreDNSPrefix, cfg.DryRun)
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case "rdns":
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p, err = rdns.NewRDNSProvider(
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rdns.RDNSConfig{
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DomainFilter: domainFilter,
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DryRun: cfg.DryRun,
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},
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)
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case "exoscale":
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p, err = exoscale.NewExoscaleProvider(cfg.ExoscaleEndpoint, cfg.ExoscaleAPIKey, cfg.ExoscaleAPISecret, cfg.DryRun, exoscale.ExoscaleWithDomain(domainFilter), exoscale.ExoscaleWithLogging()), nil
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case "inmemory":
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p, err = inmemory.NewInMemoryProvider(inmemory.InMemoryInitZones(cfg.InMemoryZones), inmemory.InMemoryWithDomain(domainFilter), inmemory.InMemoryWithLogging()), nil
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case "designate":
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p, err = designate.NewDesignateProvider(domainFilter, cfg.DryRun)
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case "pdns":
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p, err = pdns.NewPDNSProvider(
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ctx,
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pdns.PDNSConfig{
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DomainFilter: domainFilter,
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DryRun: cfg.DryRun,
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Server: cfg.PDNSServer,
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APIKey: cfg.PDNSAPIKey,
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TLSConfig: pdns.TLSConfig{
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TLSEnabled: cfg.PDNSTLSEnabled,
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CAFilePath: cfg.TLSCA,
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ClientCertFilePath: cfg.TLSClientCert,
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ClientCertKeyFilePath: cfg.TLSClientCertKey,
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},
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},
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)
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case "oci":
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var config *oci.OCIConfig
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config, err = oci.LoadOCIConfig(cfg.OCIConfigFile)
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if err == nil {
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p, err = oci.NewOCIProvider(*config, domainFilter, zoneIDFilter, cfg.DryRun)
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}
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case "rfc2136":
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p, err = rfc2136.NewRfc2136Provider(cfg.RFC2136Host, cfg.RFC2136Port, cfg.RFC2136Zone, cfg.RFC2136Insecure, cfg.RFC2136TSIGKeyName, cfg.RFC2136TSIGSecret, cfg.RFC2136TSIGSecretAlg, cfg.RFC2136TAXFR, domainFilter, cfg.DryRun, cfg.RFC2136MinTTL, cfg.RFC2136GSSTSIG, cfg.RFC2136KerberosUsername, cfg.RFC2136KerberosPassword, nil)
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case "ns1":
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p, err = ns1.NewNS1Provider(
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ns1.NS1Config{
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DomainFilter: domainFilter,
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ZoneIDFilter: zoneIDFilter,
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NS1Endpoint: cfg.NS1Endpoint,
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NS1IgnoreSSL: cfg.NS1IgnoreSSL,
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DryRun: cfg.DryRun,
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MinTTLSeconds: cfg.NS1MinTTLSeconds,
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},
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)
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case "transip":
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p, err = transip.NewTransIPProvider(cfg.TransIPAccountName, cfg.TransIPPrivateKeyFile, domainFilter, cfg.DryRun)
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case "scaleway":
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p, err = scaleway.NewScalewayProvider(ctx, domainFilter, cfg.DryRun)
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case "godaddy":
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p, err = godaddy.NewGoDaddyProvider(ctx, domainFilter, cfg.GoDaddyTTL, cfg.GoDaddyAPIKey, cfg.GoDaddySecretKey, cfg.GoDaddyOTE, cfg.DryRun)
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default:
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log.Fatalf("unknown dns provider: %s", cfg.Provider)
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}
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if err != nil {
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log.Fatal(err)
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}
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var r registry.Registry
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switch cfg.Registry {
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case "noop":
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r, err = registry.NewNoopRegistry(p)
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case "txt":
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r, err = registry.NewTXTRegistry(p, cfg.TXTPrefix, cfg.TXTSuffix, cfg.TXTOwnerID, cfg.TXTCacheInterval, cfg.TXTWildcardReplacement)
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case "aws-sd":
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r, err = registry.NewAWSSDRegistry(p.(*awssd.AWSSDProvider), cfg.TXTOwnerID)
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default:
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log.Fatalf("unknown registry: %s", cfg.Registry)
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}
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if err != nil {
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log.Fatal(err)
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}
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policy, exists := plan.Policies[cfg.Policy]
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if !exists {
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log.Fatalf("unknown policy: %s", cfg.Policy)
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}
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ctrl := controller.Controller{
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Source: endpointsSource,
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Registry: r,
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Policy: policy,
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Interval: cfg.Interval,
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DomainFilter: domainFilter,
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ManagedRecordTypes: cfg.ManagedDNSRecordTypes,
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MinInterval: cfg.MinInterval,
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}
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if cfg.Once {
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err := ctrl.RunOnce(ctx)
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if err != nil {
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log.Fatal(err)
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}
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os.Exit(0)
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}
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if cfg.UpdateEvents {
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// Add RunOnce as the handler function that will be called when ingress/service sources have changed.
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// Note that k8s Informers will perform an initial list operation, which results in the handler
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// function initially being called for every Service/Ingress that exists
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ctrl.Source.AddEventHandler(ctx, func() { ctrl.ScheduleRunOnce(time.Now()) })
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}
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ctrl.ScheduleRunOnce(time.Now())
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ctrl.Run(ctx)
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}
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func handleSigterm(cancel func()) {
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signals := make(chan os.Signal, 1)
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signal.Notify(signals, syscall.SIGTERM)
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<-signals
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log.Info("Received SIGTERM. Terminating...")
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cancel()
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}
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func serveMetrics(address string) {
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http.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
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w.WriteHeader(http.StatusOK)
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w.Write([]byte("OK"))
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})
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http.Handle("/metrics", promhttp.Handler())
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log.Fatal(http.ListenAndServe(address, nil))
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}
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