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cluster_health.go 3.32 KB
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// Copyright 2015 The etcd Authors
//
// 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 command
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/signal"
"time"
"github.com/coreos/etcd/client"
"github.com/urfave/cli"
)
func NewClusterHealthCommand() cli.Command {
return cli.Command{
Name: "cluster-health",
Usage: "check the health of the etcd cluster",
ArgsUsage: " ",
Flags: []cli.Flag{
cli.BoolFlag{Name: "forever, f", Usage: "forever check the health every 10 second until CTRL+C"},
},
Action: handleClusterHealth,
}
}
func handleClusterHealth(c *cli.Context) error {
forever := c.Bool("forever")
if forever {
sigch := make(chan os.Signal, 1)
signal.Notify(sigch, os.Interrupt)
go func() {
<-sigch
os.Exit(0)
}()
}
tr, err := getTransport(c)
if err != nil {
handleError(c, ExitServerError, err)
}
hc := http.Client{
Transport: tr,
}
cln := mustNewClientNoSync(c)
mi := client.NewMembersAPI(cln)
ms, err := mi.List(context.TODO())
if err != nil {
fmt.Println("cluster may be unhealthy: failed to list members")
handleError(c, ExitServerError, err)
}
for {
healthyMembers := 0
for _, m := range ms {
if len(m.ClientURLs) == 0 {
fmt.Printf("member %s is unreachable: no available published client urls\n", m.ID)
continue
}
checked := false
for _, url := range m.ClientURLs {
resp, err := hc.Get(url + "/health")
if err != nil {
fmt.Printf("failed to check the health of member %s on %s: %v\n", m.ID, url, err)
continue
}
result := struct{ Health string }{}
nresult := struct{ Health bool }{}
bytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("failed to check the health of member %s on %s: %v\n", m.ID, url, err)
continue
}
resp.Body.Close()
err = json.Unmarshal(bytes, &result)
if err != nil {
err = json.Unmarshal(bytes, &nresult)
}
if err != nil {
fmt.Printf("failed to check the health of member %s on %s: %v\n", m.ID, url, err)
continue
}
checked = true
if result.Health == "true" || nresult.Health {
fmt.Printf("member %s is healthy: got healthy result from %s\n", m.ID, url)
healthyMembers++
} else {
fmt.Printf("member %s is unhealthy: got unhealthy result from %s\n", m.ID, url)
}
break
}
if !checked {
fmt.Printf("member %s is unreachable: %v are all unreachable\n", m.ID, m.ClientURLs)
}
}
switch healthyMembers {
case len(ms):
fmt.Println("cluster is healthy")
case 0:
fmt.Println("cluster is unavailable")
default:
fmt.Println("cluster is degraded")
}
if !forever {
if healthyMembers == len(ms) {
os.Exit(ExitSuccess)
}
os.Exit(ExitClusterNotHealthy)
}
fmt.Printf("\nnext check after 10 second...\n\n")
time.Sleep(10 * time.Second)
}
}
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