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Internal services

Internal services is a Kubernetes operator to offer a way to run internal queries from Stonesoup operators.

Table of contents

Running, building and testing the operator

This operator provides a Makefile to run all the usual development tasks. This file can be used by cloning the repository and running make over any of the provided targets.

Running the operator locally

When testing locally (eg. a CRC cluster), the command make run install can be used to deploy and run the operator. If any change has been done in the code, make manifests generate should be executed before to generate the new resources and build the operator.

Build and push a new image

To build the operator and push a new image to the registry, the following commands can be used:

$ make docker-build
$ make docker-push

These commands will use the default image and tag. To modify them, new values for TAG and IMG environment variables can be passed. For example, to override the tag:

$ TAG=my-tag make docker-build
$ TAG=my-tag make docker-push

Or, in the case the image should be pushed to a different repository:

$ IMG=quay.io/user/internal-services:my-tag make docker-build
$ IMG=quay.io/user/internal-services:my-tag make docker-push

Running tests

To test the code, simply run make test. This command will fetch all the required dependencies and test the code. The test coverage will be reported at the end, once all the tests have been executed.

Disabling Webhooks for local development

Webhooks require self-signed certificates to validate the resources. To disable webhooks during local development and testing, export the ENABLE_WEBHOOKS variable setting its value to false or prepend it while running the operator using the following command:

$ ENABLE_WEBHOOKS=false make run install

Accessing the logs

CloudWatch

The procedure to request access to CloudWatch is documented in the Getting Access page. Make sure MFA is enabled to your account, otherwise it will not be possible to access the logs.

Once in the CloudWatch web console you can search for stonesoup-int-svc in the log group search box.

Splunk

First access the Splunk & app-sre page and complete the "Access to Monitoring Platform" request.

Once you have the access granted, go to the monitoring URL (will be given by Corporate IT team) and use the following query in the search box:

index="rh_tekton_pipeline" tkn_namespace_name="stonesoup-int-srvc"

As of May.2023 no logs for Internal Services are sent to Splunk.

Testing the operator using Kind

The following steps were tested on Fedora 38 as it runs seamlessly but it may be reproduced in any Linux distribution.

For RHEL users: Extra steps might be required (Kind - Rootless) but as of May 2023 there was no success running Kind after applying them.

Installing kind

$ go install sigs.k8s.io/[email protected]

Installing kubectl

The following link shows the steps to install kubectl: https://kubernetes.io/docs/tasks/tools/

Creating the clusters

Create the local and remote clusters and install tekton latest on them. Use two different terminals for that - one for each cluster.

local cluster terminal

$ mkdir ~/.kube
$ export KUBECONFIG=~/.kube/local
$ kind create cluster --name=local
$ kubectl apply --filename https://storage.googleapis.com/tekton-releases/pipeline/latest/release.yaml

remote cluster terminal

$ export KUBECONFIG=~/.kube/remote
$ kind create cluster --name=remote
$ kubectl apply --filename https://storage.googleapis.com/tekton-releases/pipeline/latest/release.yaml

Clone and run the operator

$ git clone [email protected]:konflux-ci/internal-services.git
Cloning into 'internal-services'...

Installing the internal-services CR

Both clusters should have the CRs installed, so the following steps should be done in both terminals, local and remote.

$ cd internal-services
internal-services $ make manifests generate
internal-services $ make install

Running the operator in the cluster

The operator needs to run a single cluster - in this test case, the local cluster/terminal - and it will listen for InternalRequests created in the remote cluster denoted by the --remote-cluster-config-file parameter.

It also requires the configuration set in a InternalServicesConfig resource - still in the local cluster - with the following content:

cat > config.yaml  <<EOF
apiVersion: appstudio.redhat.com/v1alpha1
kind: InternalServicesConfig
metadata:
  name: "config"
spec:
  allowList:
    - default
  debug: true
  volumeClaim:
    name: workspace
    size: 1Gi
EOF
$ kubectl create -f config.yaml

When using kind the namespace used is the default namespace so that is why it is listed in the allowList parameter. Should the operator run in other namespace than the default namespace the items in allowList should be set accordingly.

Note that the InternalServiceConfig MUST be named config.

Then you can start the operator:

internal-services $ go run main.go --remote-cluster-config-file=$HOME/.kube/remote

Testing an InternalRequest

To process a InternalRequest the internal-services-controller requires a Pipeline created in the Cluster that the request should run in.

Sample Pipeline

In this example the following sample Pipeline should exist in the local cluster.

$ cat > pipeline.yaml <<EOF
apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
  name: sample
spec:
  tasks:
  - name: sample
    taskSpec:
      results:
      - name: output
        description: just an example
      steps:
      - image: ubuntu
        script:
          echo "Output from today's demo" | tee $(results.output.path)
  results:
  - name: foo
    description: result from the task
    value: $(tasks.sample.results.output)
EOF
$ kubectl create -f pipeline.yaml

Sample InternalRequest

An InternalRequest should be created in the remote cluster so the internal-services-controller can read and process it from the local cluster. The operator then creates a PipelineRun out of the defined Pipeline in the InternalRequest parameter request.

Below follows one sample InternalRequest

$ cat > internalrequest.yaml <<EOF
apiVersion: appstudio.redhat.com/v1alpha1
kind: InternalRequest
metadata:
  name: "myrequest"
spec:
  request: "sample"
  params:
    foo: bar
    baz: qux
EOF
$ kubectl create -f internalrequest.yaml

Once an InternalRequest is created and its PipelineRun is completed you should see their results in the InternalRequest results.

$ kubectl get internalrequest myrequest -o yaml
apiVersion: appstudio.redhat.com/v1alpha1
kind: InternalRequest
metadata:
  creationTimestamp: "2023-01-12T15:34:07Z"
  generation: 1
  name: myrequest
  namespace: default
  resourceVersion: "350930396"
  uid: 9c1a56c6-7ee7-4b4d-aebe-bf1a67af0b48
spec:
  params:
    foo: bar
    baz: qux
  request: sample
status:
  completionTime: "2023-01-12T15:34:12Z"
  conditions:
  - lastTransitionTime: "2023-01-12T15:34:12Z"
    message: ""
    reason: Succeeded
    status: "True"
    type: InternalRequestSucceeded
  results:
    foo: |
      Output from today's demo
  startTime: "2023-01-12T15:34:12Z"

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