Useexternal-dnstoauto-bondroute53inEKS
Install EKS cluster
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How to install eksctl
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# eksctl create cluster -f cluster.yaml
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
name: cluster01
region: ap-northeast-2
vpc:
subnets:
public:
ap-northeast-2a: { id: subnet-dbbb4fb2 }
ap-northeast-2b: { id: subnet-2b4fa650 }
ap-northeast-2c: { id: subnet-99182fd3 }
private:
ap-northeast-2a: { id: subnet-dbbb4fb2 }
ap-northeast-2b: { id: subnet-2b4fa650 }
ap-northeast-2c: { id: subnet-99182fd3 }
nodeGroups:
- name: ng01
labels: { role: workers }
instanceType: t2.xlarge
minSize: 2
maxSize: 8
volumeSize: 100
volumeType: gp2
ami: auto
amiFamily: Ubuntu1804
#privateNetworking: true
ssh:
publicKeyName: gexj
#publicKeyPath: ~/.ssh/gexj.pubRecord run result
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[ℹ] using region ap-northeast-2
[✔] using existing VPC (vpc-1fa75276) and subnets (private:[subnet-2b4fa650 subnet-99182fd3 subnet-dbbb4fb2] public:[subnet-dbbb4fb2 subnet-2b4fa650 subnet-99182fd3])
[!] custom VPC/subnets will be used; if resulting cluster doesn't function as expected, make sure to review the configuration of VPC/subnets
[ℹ] nodegroup "ng01" will use "ami-0f37e6cfe5a2e9281" [Ubuntu1804/1.13]
[ℹ] using EC2 key pair "gexj"
[ℹ] using Kubernetes version 1.13
[ℹ] creating EKS cluster "cluster01" in "ap-northeast-2" region
[ℹ] 1 nodegroup (ng01) was included
[ℹ] will create a CloudFormation stack for cluster itself and 1 nodegroup stack(s)
[ℹ] if you encounter any issues, check CloudFormation console or try 'eksctl utils describe-stacks --region=ap-northeast-2 --name=cluster01'
[ℹ] CloudWatch logging will not be enabled for cluster "cluster01" in "ap-northeast-2"
[ℹ] you can enable it with 'eksctl utils update-cluster-logging --region=ap-northeast-2 --name=cluster01'
[ℹ] 2 sequential tasks: { create cluster control plane "cluster01", create nodegroup "ng01" }
[ℹ] building cluster stack "eksctl-cluster01-cluster"
[ℹ] deploying stack "eksctl-cluster01-cluster"
[ℹ] building nodegroup stack "eksctl-cluster01-nodegroup-ng01"
[ℹ] deploying stack "eksctl-cluster01-nodegroup-ng01"
[✔] all EKS cluster resource for "cluster01" had been created
[✔] saved kubeconfig as "/root/.kube/config"
[ℹ] adding role "arn:aws:iam::647035961056:role/eksctl-cluster01-nodegroup-ng01-NodeInstanceRole-GDG5Y6EPZ0B8" to auth ConfigMap
[ℹ] nodegroup "ng01" has 0 node(s)
[ℹ] waiting for at least 2 node(s) to become ready in "ng01"
[ℹ] nodegroup "ng01" has 2 node(s)
[ℹ] node "ip-172-31-25-102.ap-northeast-2.compute.internal" is ready
[ℹ] node "ip-172-31-9-210.ap-northeast-2.compute.internal" is ready
[ℹ] kubectl command should work with "/root/.kube/config", try 'kubectl get nodes'
[✔] EKS cluster "cluster01" in "ap-northeast-2" region is readyAdd IAM Permissions to the roles created above
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{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"route53:ChangeResourceRecordSets"
],
"Resource": [
"arn:aws:route53:::hostedzone/*"
]
},
{
"Effect": "Allow",
"Action": [
"route53:ListHostedZones",
"route53:ListResourceRecordSets"
],
"Resource": [
"*"
]
}
]
}Set up a hosted zone
## If you prefer to try-out ExternalDNS in one of the existing hosted-zones you can skip this step# aws route53 create-hosted-zone --name "gexj.club." --caller-reference "gexj-clube-$(date +%s)" |
{
"Location": "https://route53.amazonaws.com/2013-04-01/hostedzone/Z3P062U2BQWNDS",
"HostedZone": {
"Id": "/hostedzone/Z3P062U2BQWNDS",
"Name": "gexj.club.",
"CallerReference": "gexj-clube-1568880027",
"Config": {
"PrivateZone": false
},
"ResourceRecordSetCount": 2
},
"ChangeInfo": {
"Id": "/change/C1GWAKWYESG64Y",
"Status": "PENDING",
"SubmittedAt": "2019-09-19T08:00:28.557Z"
},
"DelegationSet": {
"NameServers": [
"ns-771.awsdns-32.net",
"ns-378.awsdns-47.com",
"ns-1192.awsdns-21.org",
"ns-1786.awsdns-31.co.uk"
]
}
} Deploy ExternalDNS
$ kubectl apply -f external-dns-with-rbac.yaml
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# kubectl logs external-dns-5454846d9b-sdjzd -f
time="2019-09-19T08:06:43Z" level=info msg="config: {Master: KubeConfig: RequestTimeout:30s IstioIngressGatewayServices:[istio-system/istio-ingressgateway] ContourLoadBalancerService:heptio-contour/contour Sources:[service ingress] Namespace: AnnotationFilter: FQDNTemplate: CombineFQDNAndAnnotation:false IgnoreHostnameAnnotation:false Compatibility: PublishInternal:false PublishHostIP:false ConnectorSourceServer:localhost:8080 Provider:aws GoogleProject: DomainFilter:[gexj.club] ExcludeDomains:[] ZoneIDFilter:[] AlibabaCloudConfigFile:/etc/kubernetes/alibaba-cloud.json AlibabaCloudZoneType: AWSZoneType:public AWSZoneTagFilter:[] AWSAssumeRole: AWSBatchChangeSize:1000 AWSBatchChangeInterval:1s AWSEvaluateTargetHealth:true AWSAPIRetries:3 AWSPreferCNAME:false AzureConfigFile:/etc/kubernetes/azure.json AzureResourceGroup: CloudflareProxied:false CloudflareZonesPerPage:50 CoreDNSPrefix:/skydns/ RcodezeroTXTEncrypt:false InfobloxGridHost: InfobloxWapiPort:443 InfobloxWapiUsername:admin InfobloxWapiPassword: InfobloxWapiVersion:2.3.1 InfobloxSSLVerify:true InfobloxView: InfobloxMaxResults:0 DynCustomerName: DynUsername: DynPassword: DynMinTTLSeconds:0 OCIConfigFile:/etc/kubernetes/oci.yaml InMemoryZones:[] PDNSServer:http://localhost:8081 PDNSAPIKey: PDNSTLSEnabled:false TLSCA: TLSClientCert: TLSClientCertKey: Policy:upsert-only Registry:txt TXTOwnerID:/hostedzone/Z3P062U2BQWNDS TXTPrefix: Interval:1m0s Once:false DryRun:false LogFormat:text MetricsAddress::7979 LogLevel:info TXTCacheInterval:0s ExoscaleEndpoint:https://api.exoscale.ch/dns ExoscaleAPIKey: ExoscaleAPISecret: CRDSourceAPIVersion:externaldns.k8s.io/v1alpha1 CRDSourceKind:DNSEndpoint ServiceTypeFilter:[] CFAPIEndpoint: CFUsername: CFPassword: RFC2136Host: RFC2136Port:0 RFC2136Zone: RFC2136Insecure:false RFC2136TSIGKeyName: RFC2136TSIGSecret: RFC2136TSIGSecretAlg: RFC2136TAXFR:false NS1Endpoint: NS1IgnoreSSL:false TransIPAccountName: TransIPPrivateKeyFile:}"
time="2019-09-19T08:06:43Z" level=info msg="Created Kubernetes client https://10.100.0.1:443"
time="2019-09-19T08:06:47Z" level=info msg="All records are already up to date apiVersion: v1 kind: ServiceAccount metadata: name: external-dns --- apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRole metadata: name: external-dns rules: - apiGroups: [""] resources: ["services"] verbs: ["get","watch","list"] - apiGroups: [""] resources: ["pods"] verbs: ["get","watch","list"] - apiGroups: ["extensions"] resources: ["ingresses"] verbs: ["get","watch","list"] - apiGroups: [""] resources: ["nodes"] verbs: ["list","watch"] --- apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRoleBinding metadata: name: external-dns-viewer roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: external-dns subjects: - kind: ServiceAccount name: external-dns namespace: default --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: external-dns spec: strategy: type: Recreate template: metadata: labels: app: external-dns spec: serviceAccountName: external-dns containers: - name: external-dns image: registry.opensource.zalan.do/teapot/external-dns:latest args: - --source=service - --source=ingress - --domain-filter=gexj.club # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones - --provider=aws - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization - --aws-zone-type=public # only look at public hosted zones (valid values are public, private or no value for both) - --registry=txt - --txt-owner-id=/hostedzone/Z3P062U2BQWNDS securityContext: fsGroup: 65534 # For ExternalDNS to be able to read Kubernetes and AWS token files
Verify ExternalDNS works (Service example)
//After roughly two minutes check that a corresponding DNS record for your service was created.# aws route53 list-resource-record-sets --output json --hosted-zone-id "/hostedzone/Z3P062U2BQWNDS" --query "ResourceRecordSets[?Name == 'nginx.gexj.club.']|[?Type == 'A']" |
[
{
"Name": "nginx.gexj.club.",
"Type": "A",
"AliasTarget": {
"HostedZoneId": "ZWKZPGTI48KDX",
"DNSName": "ada69bd16dab411e9b32f061aa86c2a6-1959369398.ap-northeast-2.elb.amazonaws.com.",
"EvaluateTargetHealth": true
}
}
]apiVersion: v1 kind: Service metadata: name: nginx annotations: external-dns.alpha.kubernetes.io/hostname: nginx.gexj.club spec: type: LoadBalancer ports: - port: 80 name: http targetPort: 80 selector: app: nginx --- apiVersion: extensions/v1beta1 kind: Deployment metadata: name: nginx spec: template: metadata: labels: app: nginx spec: containers: - image: nginx name: nginx ports: - containerPort: 80 name: http
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