indeedeng / Rabbitmq Operator
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Operator for RabbitMQ
Overview
Status: **Indeed is no longer maintaining this application and the repo will be archived 2/22/21 **
Provision and manage RabbitMQ clusters on Kubernetes! This operator currently has the following features:
- Deploy N-node RabbitMQ clusters, utilizing auto-discovery for automatic clustering
- Scale cluster replicas, storage, and CPU
- Specify persistent volume storage class
- Expose clusters to external clients using a LoadBalancer
- Datadog auto-discovery annotations
- Safely resolve network partitions without dropping messages (experimental, requires manual custom resource creation)
Getting Started
Prerequisites
You must have a Kubernetes cluster. Standard Pod and Service networking must work.
You must also have a Docker registry that both your development environment and the Kubernetes cluster can access via the CNAME registry.local.tld
The example assumes you have Rook-managed storage deployed. You can read about Rook at https://rook.io/.
Deploying the operator
Use the script deploy-operator.sh to build and push the operator image. At the end you should see a rabbitmq-operator pod spin up in the rabbitmqs namespace.
LOCAL_DOCKER_REGISTRY=registry.local.tld ./scripts/deploy-operator.sh
Deploying a cluster
Apply the example RabbitMQCustomResource. By default, this deploys a cluster with 3 instances in the rabbitmqs namespace.
kubectl apply -f examples/rabbitmq_instance.yaml
Connecting to the cluster
For each cluster, a service called <cluster name>-svc will be created. This is a standard (non-headless) service. Nodes will be added to the relevant Endpoints as soon as their healthcheck returns ok. A cluster named myrabbitmq in namespace rabbitmqs can be internally accessed at myrabbitmq.rabbitmqs.svc.cluster.local. Standard RabbitMQ ports are exposed.
To access a RabbitMQ cluster from outside the Kubernetes cluster, you need to either expose the Rabbit cluster using a NodePort or set createLoadBalancer to true. This will provision a LoadBalancer service with name <cluster-name>-svc-lb (assuming your environment supports it). You can then access your cluster using the LoadBalancer IP and standard RabbitMQ ports.
For more information on Service DNS and routing, see https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/.
Custom Resource Schema
RabbitMQCustomResource spec - example
| Field | Type | Description |
|---|---|---|
rabbitMQImage |
string | Name of RabbitMQ image |
initContainerImage |
string | Name of initContainer image |
createLoadBalancer |
boolean | Whether to create a LoadBalancer service |
preserveOrphanPVCs |
boolean | When scaling down a cluster, whether to preserve "orphaned" PVCs; this field is optional and defaults to false |
replicas |
number | Number of cluster nodes |
compute.cpuRequest |
string | CPU request per node, ex: "500m" |
compute.memory |
string | Memory request per node, ex: "512Mi" |
storage.storageClassName |
string | Storage class to use for persistent storage (immutable) |
storage.limit |
string | PersistentVolume size per cluster node (immutable) |
clusterSpec.highWatermarkFraction |
string | RabbitMQ high watermark, ex: 0.4 |
Note: Scaling replicas down is a dangerous operation. The operator does not currently make any safety guarantees when scaling down replicas.
Roadmap
This operator is very much a work-in-progress. Features that we want to implement in the near future include:
- Shovel configuration
- Policy configuration
- Improvements to user management
Code of Conduct
Operator for RabbitMQ is governed by the Contributor Covenant v 1.4.1.
License
Operator for RabbitMQ is licensed under the Apache 2 License.
Creating a Release
Check the GitHub releases page for the latest version and from that determine the next version to release. On master, create a tag (git tag <the new version>) and push it (git push --tags). release.sh will see the tag is on master and push the new version to DockerHub automatically (via Travis).
Draft a new release, put the tag you just created in the "tag version" box, and copy everything from CHANGELOG.md into the release description.
Finally, add a Bugs, Improvements, and New Features section for the next version.