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minio/cmd/healthcheck-handler.go

91 lines
3.1 KiB

/*
* Minio Cloud Storage, (C) 2018 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"fmt"
"net/http"
"os"
"runtime"
"github.com/minio/minio/cmd/logger"
)
const (
minioHealthGoroutineThreshold = 1000
)
// ReadinessCheckHandler -- checks if there are more than threshold number of goroutines running,
// returns service unavailable.
// Readiness probes are used to detect situations where application is under heavy load
// and temporarily unable to serve. In a orchestrated setup like Kubernetes, containers reporting
// that they are not ready do not receive traffic through Kubernetes Services.
func ReadinessCheckHandler(w http.ResponseWriter, r *http.Request) {
if err := goroutineCountCheck(minioHealthGoroutineThreshold); err != nil {
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
return
}
writeResponse(w, http.StatusOK, nil, mimeNone)
}
// LivenessCheckHandler -- checks if server can reach its disks internally.
// If not, server is considered to have failed and needs to be restarted.
// Liveness probes are used to detect situations where application (minio)
// has gone into a state where it can not recover except by being restarted.
func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "LivenessCheckHandler")
objLayer := newObjectLayerFn()
// Service not initialized yet
if objLayer == nil {
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
return
}
var totalLocalDisks int
var erroredDisks int
for _, endpoint := range globalEndpoints {
// Check only if local disks are accessible, we do not have
// to reach to rest of the other servers in a distributed setup.
if endpoint.IsLocal {
totalLocalDisks++
// Attempt a stat to backend, any error resulting
// from this Stat() operation is considered as backend
// is not available, count them as errors.
if _, err := os.Stat(endpoint.Path); err != nil {
logger.LogIf(ctx, err)
erroredDisks++
}
}
}
// If all exported local disks have errored, we simply let kubernetes
// take us down.
if totalLocalDisks == erroredDisks {
writeResponse(w, http.StatusServiceUnavailable, nil, mimeNone)
return
}
writeResponse(w, http.StatusOK, nil, mimeNone)
}
// checks threshold against total number of go-routines in the system and throws error if
// more than threshold go-routines are running.
func goroutineCountCheck(threshold int) error {
count := runtime.NumGoroutine()
if count > threshold {
return fmt.Errorf("too many goroutines (%d > %d)", count, threshold)
}
return nil
}