Xrootd Operator

A Kubernetes operator to deploy Xrootd at scale, in order to ease and fully automate deployment and management of XRootD clusters.

Installation

Prerequisites

• Docker
• kubectl
• Access to a Kubernetes cluster:
  • For production, use bare-metal clusters or public cloud platforms.
  • For development, use local K8S Cluster
    • Kind - use a simple script
    • Or, K3S
• Configure kubectl to use relevant K8S Cluster

Using OLM (Recommended)

• Browse operatorhub.io and install xrootd-operator.
• Click on the "Install" button and follow the instructions.

Using Deploy script (Alternative)

• You can also install the operator using a release script, downloadable as an asset with each release.
• Either:
  • Download the script, install.sh, manually and run it in a shell.
  • Run the script directly in bash:

  OP_VERSION=0.2.1 # specify the intended version here
  bash <(curl -L https://github.com/xrootd/xrootd-k8s-operator/releases/download/$OP_VERSION/install.sh)

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Development

Prerequisites

• Same prerequisites for Installation
• Go v1.13+
• operator-sdk

Build operator

• Run make manager to locally build operator binary and make run to run it against the configured Kubernetes cluster.
• Run make build to build operator image from scratch and loads it in the k8s cluster.
• The build command can be configured with the cluster's name and provider to target where the built operator image will be loaded. Set the following environment variables:
  • CLUSTER_PROVIDER=(kind/k3s/minishift)
  • CLUSTER_NAME=<cluster name>

Install operator

• Run make deploy to deploy the operator image in the cluster, along with applying the required roles, service accounts etc.
• To uninstall the CRDs, run make uninstall. To cleanup everything, including the operator deployment, run make undeploy.

Bundle

Xrootd Operator is integrated with OLM and configured to use Bundle format.

• To generate OLM CSV manifests and bundle metadata, run make bundle.
• To build the operator bundle image, run make bundle-build.

Testing

• Unit Tests: Run the unit tests with make test.
• Integration Tests: Run the suite of e2e tests with make test-e2e.

OpenShift Cluster

• For local development, it's recommended to use CodeReady Containers since it supports Openshift v4+. Minishift is a suitable alternative, however it only supports till OpenShift v3.
• To test operator via scripted approach, make deploy works.
• To test operator using OLM, follow testing guide for deployment using custom images.

  TODO: Testing bundles is still not officially supported.

NOTE: Minishift uses Kubernetes v1.11.x, so it only supports till OLM v0.14.x (because later OLM versions uses apiextensions.k8s.io/v1 for CRD manifests)

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Usage

• Make sure the xrootd-operator is up and runnning in your K8S cluster (otherwise follow Installation/Development steps):
  • To check the status, run kubectl describe pod -l name=xrootd-operator
• Example manifests to deploy Xrootd instance are at manifests folder.
• To apply any manifest, simply use kubectl apply:
  • For example, to apply base sample manifest, run kubectl apply -k manifests/base

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Troubleshooting

• Check operator logs: kubectl logs -l name=xrootd-operator
• Create issue and if needed, provide operator logs too.

Useful Links

• Xrootd
• Xrootd Config Docs
• Xrootd Example Dockerfile