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https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s
K8s controller implementing Multi-Cluster Services API based on AWS Cloud Map.
https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s
aws aws-cloudmap eks golang k8s k8s-controller kubernetes kubernetes-controller multicluster
Last synced: 2 days ago
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K8s controller implementing Multi-Cluster Services API based on AWS Cloud Map.
- Host: GitHub
- URL: https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s
- Owner: aws
- License: apache-2.0
- Created: 2021-09-20T22:40:27.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-12-11T23:37:47.000Z (2 months ago)
- Last Synced: 2025-02-11T04:06:26.274Z (9 days ago)
- Topics: aws, aws-cloudmap, eks, golang, k8s, k8s-controller, kubernetes, kubernetes-controller, multicluster
- Language: Go
- Homepage: https://aws.amazon.com/blogs/opensource/kubernetes-multi-cluster-service-discovery-using-open-source-aws-cloud-map-mcs-controller/
- Size: 1.36 MB
- Stars: 91
- Watchers: 11
- Forks: 27
- Open Issues: 32
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
Awesome Lists containing this project
README
# AWS Cloud Map MCS Controller for K8s
[](https://godoc.org/github.com/aws/aws-cloud-map-mcs-controller-for-k8s)
[](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/actions/workflows/codeql-analysis.yml)
[](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/actions/workflows/build.yml)
[](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/actions/workflows/deploy.yml)
[](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/actions/workflows/integration-test.yml)
[](https://codecov.io/gh/aws/aws-cloud-map-mcs-controller-for-k8s)
[](http://www.apache.org/licenses/LICENSE-2.0)
[](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/issues)
[](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/issues)
[](https://goreportcard.com/report/github.com/aws/aws-cloud-map-mcs-controller-for-k8s)
## Introduction
The AWS Cloud Map Multi-cluster Service Discovery Controller for Kubernetes (K8s) implements the Kubernetes [KEP-1645: Multi-Cluster Services API](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/1645-multi-cluster-services-api) and [KEP-2149: ClusterId for ClusterSet identification](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/2149-clusterid), which allows services to communicate across multiple clusters. The implementation relies on [AWS Cloud Map](https://aws.amazon.com/cloud-map/) for enabling cross-cluster service discovery. We have detailed [step-by-step setup guide](https://aws.amazon.com/blogs/opensource/kubernetes-multi-cluster-service-discovery-using-open-source-aws-cloud-map-mcs-controller/)!
**⚠ NOTE: The current version []() is in *Alpha* phase, and NOT intended for production use. The support will be limited to critical bug fixes.**
*Checkout the [Graduation Criteria](#graduation-criteria) for moving the project to the next phase.*
## Installation
Perform the following installation steps on each participating cluster.
- For multi-cluster service discovery and consumption, the controller should be installed on a minimum of 2 EKS clusters.
- Participating clusters should be provisioned into a single AWS account, within a single AWS region.
### Dependencies
#### Network
> **The AWS Cloud Map MCS Controller for K8s provides service discovery and communication across multiple clusters, therefore implementations depend on end-end network connectivity between workloads provisioned within each participating cluster.**
- In deployment scenarios where participating clusters are provisioned into separate VPCs, connectivity will depend on correctly configured [VPC Peering](https://docs.aws.amazon.com/vpc/latest/peering/create-vpc-peering-connection.html), [inter-VPC routing](https://docs.aws.amazon.com/vpc/latest/peering/vpc-peering-routing.html), and Security Group configuration. The [VPC Reachability Analyzer](https://docs.aws.amazon.com/vpc/latest/reachability/getting-started.html) can be used to test and validate end-end connectivity between worker nodes within each cluster.
- Undefined behavior may occur if controllers are deployed without the required network connectivity between clusters.
#### Configure CoreDNS
Install the CoreDNS multicluster plugin into each participating cluster. The multicluster plugin enables CoreDNS to lifecycle manage DNS records for `ServiceImport` objects.
To install the plugin, run the following commands.
```bash
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/samples/coredns-clusterrole.yaml"
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/samples/coredns-configmap.yaml"
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/samples/coredns-deployment.yaml"
```
### Install Controller
To install the latest release of the controller, run the following commands.
> **_NOTE:_** AWS region environment variable can be _optionaly_ set like `export AWS_REGION=us-west-2` Otherwise the controller will infer region in the order `AWS_REGION` environment variable, ~/.aws/config file, then EC2 metadata (for EKS environment)
```sh
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/config/controller_install_release"
```
> 📌 See [Releases](#Releases) section for details on how to install other versions.
The controller must have sufficient IAM permissions to perform required Cloud Map operations. Grant IAM access rights `AWSCloudMapFullAccess` to the controller Service Account to enable the controller to manage Cloud Map resources.
## Usage
### Configure `cluster.clusterset.k8s.io` and `clusterset.k8s.io`
`cluster.clusterset.k8s.io` is a unique identifier for the cluster.
`clusterset.k8s.io` is an identifier that relates to the `ClusterSet` in which the cluster belongs.
```yaml
apiVersion: about.k8s.io/v1alpha1
kind: ClusterProperty
metadata:
name: cluster.clusterset.k8s.io
spec:
value: [Your Cluster identifier]
---
apiVersion: about.k8s.io/v1alpha1
kind: ClusterProperty
metadata:
name: clusterset.k8s.io
spec:
value: [Your ClusterSet identifier]
```
**Example:**
```yaml
apiVersion: about.k8s.io/v1alpha1
kind: ClusterProperty
metadata:
name: cluster.clusterset.k8s.io
spec:
value: my-first-cluster
---
apiVersion: about.k8s.io/v1alpha1
kind: ClusterProperty
metadata:
name: clusterset.k8s.io
spec:
value: my-clusterset
```
### Export services
Then assuming you already have a Service installed, apply a `ServiceExport` yaml to the cluster in which you want to export a service. This can be done for each service you want to export.
```yaml
kind: ServiceExport
apiVersion: multicluster.x-k8s.io/v1alpha1
metadata:
namespace: [Your service namespace here]
name: [Your service name]
```
**Example:** This will export a service with name *my-amazing-service* in namespace *hello*
```yaml
kind: ServiceExport
apiVersion: multicluster.x-k8s.io/v1alpha1
metadata:
namespace: hello
name: my-amazing-service
```
*See the `samples` directory for a set of example yaml files to set up a service and export it. To apply the sample files run the following commands.*
```sh
kubectl create namespace example
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/samples/example-deployment.yaml
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/samples/example-service.yaml
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/samples/example-serviceexport.yaml
```
### Import services
In your other cluster, the controller will automatically sync services registered in AWS Cloud Map by applying the appropriate `ServiceImport`. To list them all, run the following command.
```sh
kubectl get ServiceImport -A
```
## Releases
AWS Cloud Map MCS Controller for K8s adheres to the [SemVer](https://semver.org/) specification. Each release updates the major version tag (eg. `vX`), a major/minor version tag (eg. `vX.Y`) and a major/minor/patch version tag (eg. `vX.Y.Z`). To see a full list of all releases, refer to our [Github releases page](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/releases).
> **_NOTE:_** AWS region environment variable can be _optionally_ set like `export AWS_REGION=us-west-2` Otherwise controller will infer region in the order `AWS_REGION` environment variable, ~/.aws/config file, then EC2 metadata (for EKS environment)
The following command format is used to install from a particular release.
```sh
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/config/controller_install_release[?ref=*git version tag*]"
```
Run the following command to install the latest release.
```sh
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/config/controller_install_release"
```
The following example will install release v0.1.0.
```sh
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/config/controller_install_release?ref=v0.1.0"
```
We also maintain a `latest` tag, which is updated to stay in line with the `main` branch. We **do not** recommend installing this on any production cluster, as any new major versions updated on the `main` branch will introduce breaking changes.
To install from `latest` tag run the following command.
```sh
kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/config/controller_install_latest"
```
## Graduation Criteria
### Alpha -> Beta Graduation
* Implement the [resiliency milestone](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/milestone/3).
### Beta -> GA Graduation
* Scalability/performance testing.
* Implement the [observability and deployment milestone](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/milestone/6).
* [KEP-1645: Multi-Cluster Services API](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/1645-multi-cluster-services-api) and [KEP-2149: ClusterId for ClusterSet identification](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/2149-clusterid) are Beta or GA.
## Slack community
We have an open Slack community where users may get support with integration, discuss controller functionality and provide input on our feature roadmap. https://awsappmesh.slack.com/#k8s-mcs-controller
Join the channel with this [invite](https://join.slack.com/t/awsappmesh/shared_invite/zt-dwgbt85c-Sj_md92__quV8YADKfsQSA).
## Contributing
`aws-cloud-map-mcs-controller-for-k8s` is an open source project. See [CONTRIBUTING](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/blob/main/CONTRIBUTING.md) for details.
## License
This project is distributed under the
[Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0),
see [LICENSE](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/blob/main/LICENSE) and [NOTICE](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/blob/main/NOTICE) for more information.