The DNS Operator is a kubernetes based controller responsible for reconciling DNS Record custom resources. It interfaces with cloud DNS providers such as AWS, Google and Azure to bring the DNS zone into the state declared in these CRDs. One of the key use cases the DNS operator solves, is allowing complex DNS routing strategies such as Geo and Weighted to be expressed. This allows you to leverage DNS as the first layer of traffic management. These strategies increase in value as you works across multiple clusters. DNS operator can be deployed to multiple cluster and coordinate on a given zone allowing you to use a shared domain name to balance traffic based on your requirements.

NOTE: You can optionally skip this step but at least one DNS Provider Secret will need to be configured with valid credentials to use the DNS Operator.

make local-setup-aws-clean local-setup-aws-generate AWS_ACCESS_KEY_ID=<My AWS ACCESS KEY> AWS_SECRET_ACCESS_KEY=<My AWS Secret Access Key>

More details about the AWS provider can be found here

make local-setup-gcp-clean local-setup-gcp-generate GCP_GOOGLE_CREDENTIALS='<My GCP Credentials.json>' GCP_PROJECT_ID=<My GCP PROJECT ID>

More details about the GCP provider can be found here

make local-setup-azure-clean local-setup-azure-generate KUADRANT_AZURE_CREDENTIALS='<My Azure Credentials.json>'

Info on generating service principal credentials here

Get your resource group ID like so:

az group show --resource-group <resource group name> | jq ".id" -r

Also give traffic manager contributor role:

az role assignment create --role "Traffic Manager Contributor" --assignee $EXTERNALDNS_SP_APP_ID --scope <RESOURCE_GROUP_ID>

Getting the zone ID can be achieved using the below command:

az network dns zone show --name <my domain name> --resource-group <my resource group> --query "{id:id,domain:name}"

1. Create local environment(creates kind cluster)

make local-setup

1. Run your controller (this will run in the foreground, so switch to a new terminal if you want to leave it running):

make run

1. Create local environment(creates kind cluster)

make local-setup DEPLOY=true

1. Verify controller deployment

kubectl logs -f deployments/dns-operator-controller-manager -n dns-operator-system

You’ll need a Kubernetes cluster to run against. You can use KIND to get a local cluster for testing, or run against a remote cluster. Note: Your controller will automatically use the current context in your kubeconfig file (i.e. whatever cluster kubectl cluster-info shows).

1. Apply Operator manifests

kustomize build config/default | kubectl apply -f -

1. Verify controller deployment

kubectl logs -f deployments/dns-operator-controller-manager -n dns-operator-system

The e2e test suite can be executed against any cluster running the DNS Operator with configuration added for any supported provider.

make test-e2e TEST_DNS_ZONE_DOMAIN_NAME=<My domain name> TEST_DNS_PROVIDER_SECRET_NAME=<My provider secret name> TEST_DNS_NAMESPACES=<My test namespace(s)>

If you are editing the API definitions, generate the manifests such as CRs or CRDs using:

make manifests

NOTE: Run make --help for more information on all potential make targets

More information can be found via the Kubebuilder Documentation

The controller can be started with any of the following flags or environmental variables. Upon the start of the controller operator give precedence to envars (i.e. PROVIDER envar will override --provider flag). If neither is set the default value will be used. Envars are parsed into their types from a string where applicable. If parsing fails - envar is ignored

Logs are following the general guidelines:

• logger.Info() describe a high-level state of the resource such as creation, deletion and which reconciliation path was taken.
• logger.Error() describe only those errors that are not returned in the result of the reconciliation. If error is occurred there should be only one error message.
• logger.V(1).Info() debug level logs to give information about every change or event caused by the resource as well as every update of the resource.

The --zap-devel argument will enable debug level logs for the output. Otherwise, all V() logs are ignored.

Not exhaustive list of metadata for DNSRecord controller:

• level - logging level. Values are: info,debug or error
• ts - timestamp
• logger - logger name
• msg
• controller and controllerKind - controller name, and it's kind respectively to output the log
• DNSRecord - name and namespace of the DNS Record CR that is being reconciled
• reconcileID
• ownerID - ID the of owner of the DNS Record
• txtPrefix/txtSuffix - prefix and suffix of the TXT record in provider.
• zoneEndpoints - endpoints that exist in the provider
• specEdnoinds - endpoints defined in the spec
• statusEndpoints - endpoints that were processed previously

Note that not all the metadata values are present at each of the logs statements.

To query logs locally you can use jq. For example: Retrieve logs by

kubectl get deployments -l app.kubernetes.io/part-of=dns-operator -A

NAMESPACE             NAME                              READY 
dns-operator-system   dns-operator-controller-manager   1/1   

And query them. For example:

kubectl logs -l control-plane=dns-operator-controller-manager -n dns-operator-system --tail -1 | sed '/^{/!d' | jq 'select(.controller=="dnsrecord" and .level=="info")'

or

kubectl logs -l control-plane=dns-operator-controller-manager -n dns-operator-system --tail -1 | sed '/^{/!d' | jq 'select(.controller=="dnsrecord" and .DNSRecord.name=="test" and .reconcileID=="2be16b6d-b90f-430e-9996-8b5ec4855d53")' | jq '.level, .msg, .zoneEndpoints, .specEndpoints, .statusEndpoints '

You could use selector in the jq with and/not/or to restrict.

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