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https://github.com/k3s-io/kubernetes.git
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79 lines
3.0 KiB
Go
79 lines
3.0 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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// The kubelet binary is responsible for maintaining a set of containers on a particular host VM.
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// It sync's data from both configuration file as well as from a quorum of etcd servers.
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// It then queries Docker to see what is currently running. It synchronizes the configuration data,
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// with the running set of containers by starting or stopping Docker containers.
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package main
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import (
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"flag"
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"log"
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"math/rand"
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"os"
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"os/exec"
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet"
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"github.com/coreos/go-etcd/etcd"
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"github.com/fsouza/go-dockerclient"
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)
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var (
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file = flag.String("config", "", "Path to the config file")
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etcdServers = flag.String("etcd_servers", "", "Url of etcd servers in the cluster")
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syncFrequency = flag.Duration("sync_frequency", 10*time.Second, "Max period between synchronizing running containers and config")
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fileCheckFrequency = flag.Duration("file_check_frequency", 20*time.Second, "Duration between checking file for new data")
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httpCheckFrequency = flag.Duration("http_check_frequency", 20*time.Second, "Duration between checking http for new data")
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manifestUrl = flag.String("manifest_url", "", "URL for accessing the container manifest")
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address = flag.String("address", "127.0.0.1", "The address for the info server to serve on")
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port = flag.Uint("port", 10250, "The port for the info server to serve on")
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hostnameOverride = flag.String("hostname_override", "", "If non-empty, will use this string as identification instead of the actual hostname.")
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)
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const dockerBinary = "/usr/bin/docker"
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func main() {
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flag.Parse()
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rand.Seed(time.Now().UTC().UnixNano())
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// Set up logger for etcd client
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etcd.SetLogger(log.New(os.Stderr, "etcd ", log.LstdFlags))
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endpoint := "unix:///var/run/docker.sock"
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dockerClient, err := docker.NewClient(endpoint)
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if err != nil {
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log.Fatal("Couldn't connnect to docker.")
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}
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hostname := []byte(*hostnameOverride)
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if string(hostname) == "" {
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hostname, err = exec.Command("hostname", "-f").Output()
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if err != nil {
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log.Fatalf("Couldn't determine hostname: %v", err)
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}
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}
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my_kubelet := kubelet.Kubelet{
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Hostname: string(hostname),
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DockerClient: dockerClient,
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FileCheckFrequency: *fileCheckFrequency,
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SyncFrequency: *syncFrequency,
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HTTPCheckFrequency: *httpCheckFrequency,
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}
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my_kubelet.RunKubelet(*file, *manifestUrl, *etcdServers, *address, *port)
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}
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