cryostat-operator

A Kubernetes Operator to automate deployment of Cryostat.

SEE ALSO

• cryostat-core for the core library providing a convenience wrapper and headless stubs for use of JFR using JDK Mission Control internals.

• cryostat for the main API backend to detect JVMs and manage JFR.

• cryostat-web for the React graphical frontend included as a submodule in Cryostat and built into Cryostat's OCI images.

• jfr-datasource for the JFR datasource for Grafana.

• cryostat-grafana-dashboard for the Grafana dashboard.

USING

Requirements

• kubernetes v1.25+ with Operator Lifecycle Manager
• cert-manager v1.11.5+ (Recommended)

Instructions

Once deployed, the cryostat instance can be accessed via web browser at the URL provided by:

kubectl get cryostat -o jsonpath='{$.items[0].status.applicationUrl}'

To use Cryostat to monitor or profile Cryostat itself - since it is also an available JVM target - you may use the Cryostat web UI to define a Custom Target with the connection URL localhost:0. This is a special value which tells Cryostat's JVM that it should connect to itself directly, without the need to expose a JMX port over the network.

BUILDING

Requirements

• go v1.21+
• operator-sdk v1.31.0
• podman or docker
• jq v1.6+
• yq v4.35+
• ginkgo (Optional)

Instructions

make generate manifests manager will trigger code/YAML generation and compile the operator controller manager, along with running some code quality checks.

make oci-build will build an OCI image from the generated YAML and compiled binary to the local registry, tagged as quay.io/crystatio/cryostat-operator. This tag can be overridden by setting the environment variables IMAGE_NAMESPACE and OPERATOR_NAME. IMAGE_VERSION can also be set to override the tagged version.

make bundle will create an OLM bundle. This will generate a CSV, CRDs and other manifests, and other required configurations for an OLM bundle versioned with version $IMAGE_VERSION in the bundle/ directory. make bundle-build will create an OCI image of this bundle, which can then be pushed to an image repository such as quay.io.

make catalog-build will build an OCI image of the operator catalog (i.e. index) with version $IMAGE_VERSION that includes the bundle image of the same version.

SETUP / DEPLOYMENT

Bundle Deployment

The operator can be deployed using OLM using make deploy_bundle. This will deploy quay.io/cryostat/cryostat-operator-bundle:$IMAGE_VERSION to your configured cluster using oc or kubectl (kubeconfig). You can set the variables IMAGE_NAMESPACE or IMAGE_VERSION to deploy different builds of the bundle. Once this is complete, the Cryostat Operator will be deployed and running in your cluster.

Manual Deployment

make install will create CustomResourceDefinitions and do other setup required to prepare the cluster for deploying the operator, using oc or kubectl on whichever OpenShift/Kubernetes cluster is configured with the local client. make uninstall destroys the CRDs and undoes the setup.

make run can be used to run the operator controller manager as a process on your local development machine and observing/interacting with your cluster. This may be useful in some development scenarios, however in this case the operator process will not have access to certain in-cluster resources such as environment variables or service account token files.

make deploy will deploy the operator using static manifests to an arbitrary namespace (default to cryostat-operator-system).

• make DEPLOY_NAMESPACE=foo-namespace deploy can be used to deploy to a namespace named foo-namespace. For a convenient shorthand, use make DEPLOY_NAMESPACE=$(kubectl config view --minify -o 'jsonpath={.contexts[0].context.namespace}') deploy to deploy to the currently active OpenShift/Kubernetes namespace.
• make undeploy will likewise remove the operator, and also uses the DEPLOY_NAMESPACE variable. This also respects the IMAGE_TAG environment variable, so that different versions of the operator can be easily deployed.
• To obtain such static manifests remotely without further customizations, use:

  # Replace ref with any version tag or branch
  kubectl kustomize "https://github.com/cryostatio/cryostat-operator.git/config/default?ref=v2.4.0"

Configuration

Once deployed, the operator deployment will be active in the cluster, but no Cryostat instance will be created. To trigger its creation, add a Cryostat CR using the UI for operator "provided APIs". Full details on the configuration options in the Cryostat CRD can be found in Configuring Cryostat. When running on Kubernetes, see Network Options for additional mandatory configuration in order to access Cryostat outside of the cluster.

For convenience, a full deployment can be created using kubectl create -f config/samples/operator_v1beta2_cryostat.yaml, or more simply, make create_cryostat_cr.

The container images used by the operator for the core application, jfr-datasource, and the Grafana dashboard can be overridden by setting the RELATED_IMAGE_CORE, RELATED_IMAGE_DATASOURCE, and RELATED_IMAGE_GRAFANA environment variables, respectively, in the operator deployment.

SECURITY

By default, the operator expects cert-manager to be available in the cluster. This allows the operator to deploy Cryostat with all communication between its internal services done over HTTPS. If you wish to disable this feature and not use cert-manager, you can set the environment variable DISABLE_SERVICE_TLS=true when you deploy the operator. We provide make cert_manager and make remove_cert_manager targets to easily install/remove cert-manager from your cluster.

User Authentication

Users can use oc whoami --show-token to retrieve their OpenShift OAuth token for the currently logged in user account. This token can be used when directly interacting with the deployed Cryostat instance(s).

When using the web-client, users can login with their username and password associated with their OpenShift account. User credentials will be remembered for the duration of the session.

If the current user account does not have sufficient permissions to list routes, list endpoints, or perform other actions that Cryostat requires, then the user may also try to authenticate using the Operator's service account. This, of course, assumes that the user has permission to view this service account's secrets.

oc get secrets | grep cryostat-operator-service-account-token will provide at least one such operator service account token secret name which can be used - for example, cryostat-operator-service-account-token-7tt7l. The token can then be retrieved for use in authenticating as the operator service account:

$ oc describe secret cryostat-operator-service-account-token-7tt7l
Name:         cryostat-operator-service-account-token-7tt7l
Namespace:    default
Labels:       <none>
Annotations:  kubernetes.io/created-by: openshift.io/create-dockercfg-secrets
              kubernetes.io/service-account.name: cryostat-operator-service-account
              kubernetes.io/service-account.uid: 692aa8c7-081e-4a51-9355-be3eaa8f9fa6

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:          7209 bytes
namespace:       7 bytes
service-ca.crt:  8422 bytes
token:           eyJhbGciOiJSUzI1NiIsImtpZCI6IkhYZC13eDdGVGwyQzdGNVpZVndScEZ2VmRxWTlzbnBUUG9HRkJpejJkV3cifQ.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.M7C1V0bN3aILBflO7TTOTikw7wLGRJ79-OkCDQIZbu71QLdX05jyCxxtlH32lr8jz6HwxfXXweh3ifG_2lbe7_TbM8jxmBoMdLuc4Q_akpmA-GQuDPrRxfHGJApYGQ6CVug3KHSrQwj2M4QrSUz7FoeQGaOH9BnWj1TrHGmOZUPJ6u7JSu2OwoLBda6rF-M4Bl72DmkyMAzikreRgPEk4D7gTCY0yNvsQDuUAwpFwmEukRC2WyTAVTpKPgThZUk-UJ-dXufbhAcqIRt6jeCQ19_Bo0zXc_ELgQydxuTack1ndT3HwRmwwNuZDFv-G3Y0YdjfRh00DqEvSn9ynZzwueDCJUxlHdznytfUWk9PA712JENpFC7b-zSHnjymIcFeUd8s_Zq_-JKrDIPnH0oZDRO_MUpKEC7Jz_8SeFJHLLGfBZt_aP4VwQHEUThiFQPwrfbd8tppUG2TKcekPScKcauy-BCI52odBzapP6meilMQVrmRtu7i30L05vgQiST_OsmSP8CuKW13a-leCCtN_aNQGqlWvLhP81H95ui-PvMzwMIDlfDZ03ycuYg4R4eUG3nUq7-42wrSdFLo8gm9wsl7y1ZRMQwHR1DCVBbHYS0iFOcmwto2Ejlrgvn3Cs0pDS7pDVoFkH2FsTopEw3jXtnkMs15mSmBnHz-UjF-l08

or more briefly:

$ oc get -o jsonpath='{.data.token}' secret cryostat-operator-service-account-token-7tt7l | base64 -d
eyJhbGciOiJSUzI1NiIsImtpZCI6IkhYZC13eDdGVGwyQzdGNVpZVndScEZ2VmRxWTlzbnBUUG9HRkJpejJkV3cifQ.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.M7C1V0bN3aILBflO7TTOTikw7wLGRJ79-OkCDQIZbu71QLdX05jyCxxtlH32lr8jz6HwxfXXweh3ifG_2lbe7_TbM8jxmBoMdLuc4Q_akpmA-GQuDPrRxfHGJApYGQ6CVug3KHSrQwj2M4QrSUz7FoeQGaOH9BnWj1TrHGmOZUPJ6u7JSu2OwoLBda6rF-M4Bl72DmkyMAzikreRgPEk4D7gTCY0yNvsQDuUAwpFwmEukRC2WyTAVTpKPgThZUk-UJ-dXufbhAcqIRt6jeCQ19_Bo0zXc_ELgQydxuTack1ndT3HwRmwwNuZDFv-G3Y0YdjfRh00DqEvSn9ynZzwueDCJUxlHdznytfUWk9PA712JENpFC7b-zSHnjymIcFeUd8s_Zq_-JKrDIPnH0oZDRO_MUpKEC7Jz_8SeFJHLLGfBZt_aP4VwQHEUThiFQPwrfbd8tppUG2TKcekPScKcauy-BCI52odBzapP6meilMQVrmRtu7i30L05vgQiST_OsmSP8CuKW13a-leCCtN_aNQGqlWvLhP81H95ui-PvMzwMIDlfDZ03ycuYg4R4eUG3nUq7-42wrSdFLo8gm9wsl7y1ZRMQwHR1DCVBbHYS0iFOcmwto2Ejlrgvn3Cs0pDS7pDVoFkH2FsTopEw3jXtnkMs15mSmBnHz-UjF-l08

DEVELOPMENT

An invocation like export IMAGE_NAMESPACE=quay.io/some-user export IMAGE_VERSION=test-version make generate manifests manager oci-build bundle bundle-build podman image prune -f && podman push $IMAGE_NAMESPACE/cryostat-operator:$IMAGE_VERSION && podman push $IMAGE_NAMESPACE/cryostat-operator-bundle:$IMAGE_VERSION make deploy_bundle is handy for local development testing using ex. CodeReady Containers. This exercises a similar build and deployment path as what end users using OLM and OperatorHub will eventually receive.

TESTING

Requirements

• (optional) oc
• (optional) crc

Instructions

make test-envtest will run controller tests using ginkgo if installed, or go test if not, requiring no cluster connection.

make test-scorecard will run the Operator SDK's scorecard test suite. This requires a Kubernetes or OpenShift cluster to be available and logged in with your kubectl or oc client. The recommended setup for development testing is CodeReady Containers (crc).

Before the scorecard tests are run, all cryostat and cryostat-operator resources will be deleted to ensure a clean slate.

make test will run all tests.