Fleet is GitOps at scale. Fleet is designed to manage up to a million clusters. It's also lightweight enough that it works great for a single cluster too, but it really shines when you get to a large scale. By large scale we mean either a lot of clusters, a lot of deployments, or a lot of teams in a single organization.
Fleet can manage deployments from git of raw Kubernetes YAML, Helm charts, or Kustomize or any combination of the three. Regardless of the source all resources are dynamically turned into Helm charts and Helm is used as the engine to deploy everything in the cluster. This gives a high degree of control, consistency, and auditability. Fleet focuses not only on the ability to scale, but to give one a high degree of control and visibility to exactly what is installed on the cluster.
Who needs documentation, let's just run this thing!
Get helm if you don't have it. Helm 3 is just a CLI and won't do bad insecure things to your cluster.
brew install helm
Install the Fleet Helm charts (there's two because we separate out CRDs for ultimate flexibility.)
VERSION=0.3.5
helm -n fleet-system install --create-namespace --wait \
fleet-crd https://github.com/rancher/fleet/releases/download/v${VERSION}/fleet-crd-${VERSION}.tgz
helm -n fleet-system install --create-namespace --wait \
fleet https://github.com/rancher/fleet/releases/download/v${VERSION}/fleet-${VERSION}.tgzChange spec.repo to your git repo of choice. Kubernetes manifest files that should
be deployed should be in /manifests in your repo.
cat > example.yaml << "EOF"
apiVersion: fleet.cattle.io/v1alpha1
kind: GitRepo
metadata:
name: sample
# This namespace is special and auto-wired to deploy to the local cluster
namespace: fleet-local
spec:
# Everything from this repo will be ran in this cluster. You trust me right?
repo: "https://github.com/rancher/fleet-examples/tree/master/simple"
EOF
kubectl apply -f example.yamlGet status of what fleet is doing
kubectl -n fleet-local get fleetYou should see something like this get created in your cluster.
kubectl get deploy frontend
NAME READY UP-TO-DATE AVAILABLE AGE
frontend 3/3 3 3 116m
Enjoy and read the docs.