forked from kubernetes/dashboard
/
dashboard.go
103 lines (90 loc) · 4.14 KB
/
dashboard.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 main
import (
"flag"
"fmt"
"log"
"net"
"net/http"
"os"
"github.com/kubernetes/dashboard/src/app/backend/client"
"github.com/kubernetes/dashboard/src/app/backend/handler"
"github.com/prometheus/client_golang/prometheus"
"github.com/spf13/pflag"
)
var (
argPort = pflag.Int("port", 9090, "The port to listen to for incoming HTTP requests")
argBindAddress = pflag.IP("bind-address", net.IPv4(0, 0, 0, 0), "The IP address on which to serve the --port (set to 0.0.0.0 for all interfaces).")
argApiserverHost = pflag.String("apiserver-host", "", "The address of the Kubernetes Apiserver "+
"to connect to in the format of protocol://address:port, e.g., "+
"http://localhost:8080. If not specified, the assumption is that the binary runs inside a "+
"Kubernetes cluster and local discovery is attempted.")
argHeapsterHost = pflag.String("heapster-host", "", "The address of the Heapster Apiserver "+
"to connect to in the format of protocol://address:port, e.g., "+
"http://localhost:8082. If not specified, the assumption is that the binary runs inside a "+
"Kubernetes cluster and service proxy will be used.")
argKubeConfigFile = pflag.String("kubeconfig", "", "Path to kubeconfig file with authorization and master location information.")
)
func main() {
// Set logging output to standard console out
log.SetOutput(os.Stdout)
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
pflag.Parse()
flag.CommandLine.Parse(make([]string, 0)) // Init for glog calls in kubernetes packages
log.Printf("Using HTTP port: %d", *argPort)
if *argApiserverHost != "" {
log.Printf("Using apiserver-host location: %s", *argApiserverHost)
}
if *argKubeConfigFile != "" {
log.Printf("Using kubeconfig file: %s", *argKubeConfigFile)
}
apiserverClient, config, err := client.CreateApiserverClient(*argApiserverHost, *argKubeConfigFile)
if err != nil {
handleFatalInitError(err)
}
versionInfo, err := apiserverClient.ServerVersion()
if err != nil {
handleFatalInitError(err)
}
log.Printf("Successful initial request to the apiserver, version: %s", versionInfo.String())
heapsterRESTClient, err := client.CreateHeapsterRESTClient(*argHeapsterHost, apiserverClient)
if err != nil {
log.Printf("Could not create heapster client: %s. Continuing.", err)
}
apiHandler, err := handler.CreateHTTPAPIHandler(apiserverClient, heapsterRESTClient, config)
if err != nil {
handleFatalInitError(err)
}
// Run a HTTP server that serves static public files from './public' and handles API calls.
// TODO(bryk): Disable directory listing.
http.Handle("/", handler.MakeGzipHandler(handler.CreateLocaleHandler()))
http.Handle("/api/", apiHandler)
// TODO(maciaszczykm): Move to /appConfig.json as it was discussed in #640.
http.Handle("/api/appConfig.json", handler.AppHandler(handler.ConfigHandler))
http.Handle("/metrics", prometheus.Handler())
log.Print(http.ListenAndServe(fmt.Sprintf("%s:%d", *argBindAddress, *argPort), nil))
}
/**
* Handles fatal init error that prevents server from doing any work. Prints verbose error
* message and quits the server.
*/
func handleFatalInitError(err error) {
log.Fatalf("Error while initializing connection to Kubernetes apiserver. "+
"This most likely means that the cluster is misconfigured (e.g., it has "+
"invalid apiserver certificates or service accounts configuration) or the "+
"--apiserver-host param points to a server that does not exist. Reason: %s\n"+
"Refer to the troubleshooting guide for more information: "+
"https://github.com/kubernetes/dashboard/blob/master/docs/user-guide/troubleshooting.md", err)
}