mirror of https://github.com/k3s-io/k3s
130 lines
4.1 KiB
Go
130 lines
4.1 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"flag"
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"net"
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"net/http"
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"strconv"
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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_ "github.com/GoogleCloudPlatform/kubernetes/pkg/healthz"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/proxy"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/proxy/config"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util/exec"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util/iptables"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/version/verflag"
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"github.com/coreos/go-etcd/etcd"
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"github.com/golang/glog"
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)
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var (
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etcdServerList util.StringList
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etcdConfigFile = flag.String("etcd_config", "", "The config file for the etcd client. Mutually exclusive with -etcd_servers")
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bindAddress = util.IP(net.ParseIP("0.0.0.0"))
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clientConfig = &client.Config{}
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healthz_port = flag.Int("healthz_port", 10249, "The port to bind the health check server. Use 0 to disable.")
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)
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func init() {
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client.BindClientConfigFlags(flag.CommandLine, clientConfig)
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flag.Var(&etcdServerList, "etcd_servers", "List of etcd servers to watch (http://ip:port), comma separated (optional). Mutually exclusive with -etcd_config")
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flag.Var(&bindAddress, "bind_address", "The IP address for the proxy server to serve on (set to 0.0.0.0 for all interfaces)")
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}
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func main() {
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flag.Parse()
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util.InitLogs()
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defer util.FlushLogs()
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verflag.PrintAndExitIfRequested()
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serviceConfig := config.NewServiceConfig()
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endpointsConfig := config.NewEndpointsConfig()
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// define api config source
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if clientConfig.Host != "" {
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glog.Infof("Using api calls to get config %v", clientConfig.Host)
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client, err := client.New(clientConfig)
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if err != nil {
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glog.Fatalf("Invalid API configuration: %v", err)
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}
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config.NewSourceAPI(
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client.Services(api.NamespaceAll),
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client.Endpoints(api.NamespaceAll),
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30*time.Second,
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serviceConfig.Channel("api"),
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endpointsConfig.Channel("api"),
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)
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} else {
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var etcdClient *etcd.Client
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// Set up etcd client
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if len(etcdServerList) > 0 {
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// Set up logger for etcd client
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etcd.SetLogger(util.NewLogger("etcd "))
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etcdClient = etcd.NewClient(etcdServerList)
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} else if *etcdConfigFile != "" {
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// Set up logger for etcd client
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etcd.SetLogger(util.NewLogger("etcd "))
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var err error
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etcdClient, err = etcd.NewClientFromFile(*etcdConfigFile)
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if err != nil {
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glog.Fatalf("Error with etcd config file: %v", err)
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}
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}
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// Create a configuration source that handles configuration from etcd.
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if etcdClient != nil {
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glog.Infof("Using etcd servers %v", etcdClient.GetCluster())
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config.NewConfigSourceEtcd(etcdClient,
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serviceConfig.Channel("etcd"),
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endpointsConfig.Channel("etcd"))
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}
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}
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if *healthz_port > 0 {
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go util.Forever(func() {
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err := http.ListenAndServe(bindAddress.String()+":"+strconv.Itoa(*healthz_port), nil)
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if err != nil {
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glog.Errorf("Starting health server failed: %v", err)
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}
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}, 5*time.Second)
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}
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protocol := iptables.ProtocolIpv4
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if net.IP(bindAddress).To4() == nil {
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protocol = iptables.ProtocolIpv6
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}
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loadBalancer := proxy.NewLoadBalancerRR()
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proxier := proxy.NewProxier(loadBalancer, net.IP(bindAddress), iptables.New(exec.New(), protocol))
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// Wire proxier to handle changes to services
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serviceConfig.RegisterHandler(proxier)
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// And wire loadBalancer to handle changes to endpoints to services
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endpointsConfig.RegisterHandler(loadBalancer)
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// Just loop forever for now...
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proxier.SyncLoop()
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}
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