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NETCONF operator

This operator provides support for:

• RFC6241: Network Configuration Protocol (NETCONF)
  • Support for the following RPC: lock, unlock, edit-config, comit, get, get-config
  • Support for custom RPC
• RFC6242: Using the NETCONF Protocol over Secure Shell (SSH)
  • Support for username/password
  • No support for pub key
• RFC5277: NETCONF Event Notifications
  • Support for create-subscription
  • No support for notification filtering
• Partially RFC8641 and RFC8639: Subscription to YANG Notifications for Datastore Updates
  • Support for establish-subscription
  • Support for delete-subscription

The operator is built using the following go-netconf client.

CRD documentation

v0.0.1

RPC Usage

The MountPoint CRD is meant to establish an SSH connection to a remote NETCONF server.

All the below supported NETCONF operations depends on a MountPoint session to be established:

• Get
• GetConfig
• EditConfig
• Commit
• Lock
• Unlock
• CreateSubscription
• EstablishSubscription

All the CRDs, beside EstablishSubscrption, has no effect when deleted.

See the examples folder to understand how to use the CRD. Also, read the CRD spec to understand the requirements.

Sequence operations

In order to sequence operations, the EditConfig, Commit, and Unlock CRDs provide to ability to define an operation it is depending on, using the dependsOn field. As such, one can achieve such flow: Lock --> EditConfig --> Commit --> Unlock.

NETCONF notifications usage

By registering to a notification stream, the operator received the notification and translate it

• by default to a Kubernetes event
• or to a kafka message using the kafka sink configuration

  kafkaSink:
    enabled: True
    topic: netconf-notification
    partition: 0
    transportType: tcp
    broker: my-cluster-kafka-brokers.default.svc.cluster.local:9092
  

This enables the consumption of the events by downstream systems for further processing.

Create subscription

When using the create-subscription CRD, only one NETCONF notification stream can be registered per session. Deleting a CreateSubscription CR has no effect. In order to remove that subscription, the RFC5277 stipulates to close the NETCONF session.

Establish subscription

There are no restriction on the EstablishSubscription CRD. It is mostly a wrapper to help manage notification handling. One session can handle many instance of the CR as using subscription will be uniquely identifiable by its _ subscription-id_. When deleting a CR, the operator will execute a delete-subscription with the subscription-id defined for that subscription.

Usage

Deployment

To deploy the operator, add the Catalog Source

oc create -f catalog-source.yaml

Then search for the "NETCONF Operator" in your OpenShift's Operator Hub

Once installed, you should be able to use its CRDs

Development

make deploy IMG=quay.io/adetalho/netconf-operator:dev

To build:

make docker-build docker-push IMG=quay.io/adetalho/netconf-operator:dev

To remove:

make undeploy

How the operator was generated using the Operator SDK

1 - create the scaffolding

operator-sdk init --domain=openshift-telco.io --repo=github.com/openshift-telco/netconf-operator

2. generate the netconf operations API.

operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind Mountpoint
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind Commit
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind EditConfig
operator-sdk create api --resource=true --controller=true -group netconf --version v1 --kind GetConfig
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind Get
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind Lock
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind Unlock
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind RPC
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind RPC
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind CreateSubscription
operator-sdk create api --resource=true --controller=true --group netconf --version v1 --kind EstablishSubscription

3. Build bundle

make bundle
make bundle-build IMG=quay.io/adetalho/netconf-operator:0.0.1 BUNDLE_IMG=quay.io/adetalho/netconf-operator-bundle:0.0.1

4. Create index

opm index add \
    --bundles quay.io/adetalho/netconf-operator-bundle:0.0.1 \
    --tag quay.io/adetalho/netconf-operator-index:0.0.1
podman push quay.io/adetalho/netconf-operator-index:0.0.1

Links

Getting started with Operator SDK