Rancher Has a Free API: Complete Kubernetes Management Platform

#kubernetes #cloudnative #opensource #devops

Rancher is an open-source container management platform that makes it easy to deploy and manage Kubernetes clusters anywhere — cloud, on-prem, or edge.

What Is Rancher?

Rancher by SUSE provides a unified management layer for multiple Kubernetes clusters. It handles provisioning, upgrades, monitoring, and access control across all your clusters from a single pane of glass.

Key Features:

Multi-cluster management
Built-in monitoring (Prometheus + Grafana)
Centralized authentication and RBAC
App catalog (Helm charts)
Cluster provisioning on any infrastructure
Fleet for GitOps at scale
Backup and disaster recovery

Installation

# Install Rancher via Docker (quick start)
docker run -d --restart=unless-stopped \
  -p 80:80 -p 443:443 \
  --privileged \
  rancher/rancher:latest

# Or via Helm on existing K8s
helm repo add rancher-stable https://releases.rancher.com/server-charts/stable
helm install rancher rancher-stable/rancher \
  --namespace cattle-system --create-namespace \
  --set hostname=rancher.example.com

Rancher API: Programmatic Cluster Management

import requests

RANCHER = "https://rancher.example.com/v3"
TOKEN = "token-xxxxx:yyyyyyyyyy"
HEADERS = {"Authorization": f"Bearer {TOKEN}"}

# List all clusters
clusters = requests.get(f"{RANCHER}/clusters", headers=HEADERS, verify=False).json()
for cluster in clusters["data"]:
    print(f"Cluster: {cluster['name']}, State: {cluster['state']}, Nodes: {cluster['nodeCount']}")

# Get cluster kubeconfig
kubeconfig = requests.post(
    f"{RANCHER}/clusters/{cluster_id}?action=generateKubeconfig",
    headers=HEADERS, verify=False
).json()
print(kubeconfig["config"])

Project and Namespace Management

# Create a project
project = requests.post(f"{RANCHER}/projects", headers=HEADERS, verify=False, json={
    "name": "production-apps",
    "clusterId": cluster_id,
    "description": "Production application workloads"
}).json()

# Create namespace in project
namespace = requests.post(
    f"{RANCHER}/clusters/{cluster_id}/namespaces",
    headers=HEADERS, verify=False,
    json={
        "name": "my-app",
        "projectId": project["id"]
    }
).json()

Deploy Apps via Catalog

# List available Helm charts
catalogs = requests.get(f"{RANCHER}/catalogs", headers=HEADERS, verify=False).json()

# Install a Helm chart
requests.post(
    f"{RANCHER}/clusters/{cluster_id}/apps",
    headers=HEADERS, verify=False,
    json={
        "name": "redis",
        "targetNamespace": "default",
        "externalId": "catalog://?catalog=library&template=redis&version=17.0.0",
        "answers": {"architecture": "standalone"}
    }
)

Monitoring API

# Get cluster metrics
metrics = requests.get(
    f"{RANCHER}/clusters/{cluster_id}/clusterMonitorGraphs",
    headers=HEADERS, verify=False
).json()

# Get node conditions
nodes = requests.get(
    f"{RANCHER}/clusters/{cluster_id}/nodes",
    headers=HEADERS, verify=False
).json()
for node in nodes["data"]:
    print(f"Node: {node['nodeName']}, CPU: {node['requested']['cpu']}, Memory: {node['requested']['memory']}")

Resources

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