# MinIO Healthcheck

MinIO server exposes three un-authenticated, healthcheck endpoints liveness probe and a cluster probe at `/minio/health/live` and `/minio/health/cluster` respectively.

## Liveness probe

This probe always responds with '200 OK'. Only fails if 'etcd' is configured and unreachable. When liveness probe fails, Kubernetes like platforms restart the container.

```
livenessProbe:
  httpGet:
    path: /minio/health/live
    port: 9000

	healthCheckClusterPath     = "/cluster"
	healthCheckClusterReadPath = "/cluster/read"
	healthCheckPathPrefix      = minioReservedBucketPath + healthCheckPath
)

// registerHealthCheckRouter - add handler functions for liveness and readiness routes.
func registerHealthCheckRouter(router *mux.Router) {
	// Healthcheck router
	healthRouter := router.PathPrefix(healthCheckPathPrefix).Subrouter()

	// Cluster check handler to verify cluster is active

## Healthcheck Probe

MinIO server has two healthcheck related un-authenticated endpoints, a liveness probe to indicate if server is responding, cluster probe to check if server can be taken down for maintenance.

- Liveness probe available at `/minio/health/live`
- Cluster probe available at `/minio/health/cluster`

// limitations under the License.

package nodeagent

import (
	"net/http"
	"sync/atomic"

	"istio.io/istio/cni/pkg/constants"
)

// StartHealthServer initializes and starts a web server that exposes liveness and readiness endpoints at port 8000.
func StartHealthServer() (installReady *atomic.Value, watchReady *atomic.Value) {
	router := http.NewServeMux()
	installReady, watchReady = initRouter(router)

	go func() {

<component name="ProjectDictionaryState">
  <dictionary name="dzharkov">
    <words>
      <w>checkcast</w>
      <w>coroutine</w>
      <w>experimentalities</w>
      <w>experimentality</w>
      <w>insn</w>
      <w>liveness</w>
      <w>parameterless</w>
    </words>
  </dictionary>

## Monitoring MinIO in Kubernetes

MinIO server exposes un-authenticated liveness endpoints so Kubernetes can natively identify unhealthy MinIO containers. MinIO also exposes Prometheus compatible data on a different endpoint to enable Prometheus users to natively monitor their MinIO deployments.

## Explore Further

	RepairFieldSelectors     = "repair-field-selectors"
)

// Internal constants
const (
	DefaultKubeconfigMode = 0o600

	CNIAddEventPath = "/cmdadd"
	UDSLogPath      = "/log"

	// K8s liveness and readiness endpoints
	LivenessEndpoint  = "/healthz"
	ReadinessEndpoint = "/readyz"
	ReadinessPort     = "8000"
)

// Exposed for testing constants
var (
	CNIBinDir          = "/opt/cni/bin"

var errErasureV3ThisEmpty = fmt.Errorf("Erasure format version 3 has This field empty")

// isServerResolvable - checks if the endpoint is resolvable
// by sending a naked HTTP request with liveness checks.
func isServerResolvable(endpoint Endpoint, timeout time.Duration) error {
	serverURL := &url.URL{
		Scheme: endpoint.Scheme,
		Host:   endpoint.Host,

	op = strings.Replace(op, "ClusterCheckHandler", "health.Cluster", 1)
	op = strings.Replace(op, "ClusterReadCheckHandler", "health.ClusterRead", 1)
	op = strings.Replace(op, "LivenessCheckHandler", "health.Liveness", 1)
	op = strings.Replace(op, "ReadinessCheckHandler", "health.Readiness", 1)
	op = strings.Replace(op, "-fm", "", 1)
	return op
}

// If trace is enabled, execute the request if it is traced by other handlers

			}
			return
		}
	}
	writeResponse(w, http.StatusOK, nil, mimeNone)
}

// LivenessCheckHandler checks whether MinIO is up. It differs from the
// readiness handler since a failing liveness check causes pod restarts
// in K8S environments. Therefore, it does not contact external systems.
func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
	if objLayer := newObjectLayerFn(); objLayer == nil {