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server.go
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server.go
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package server
import (
"context"
"flag"
"fmt"
net2 "net"
"os"
"path/filepath"
"strings"
systemd "github.com/coreos/go-systemd/daemon"
"github.com/docker/docker/pkg/reexec"
"github.com/natefinch/lumberjack"
"github.com/pkg/errors"
"github.com/rancher/k3s/pkg/agent"
"github.com/rancher/k3s/pkg/cli/cmds"
"github.com/rancher/k3s/pkg/server"
"github.com/rancher/norman/signal"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"k8s.io/apimachinery/pkg/util/net"
_ "github.com/mattn/go-sqlite3" // ensure we have sqlite
)
func setupLogging(app *cli.Context) {
if !app.GlobalBool("debug") {
flag.Set("stderrthreshold", "3")
flag.Set("alsologtostderr", "false")
flag.Set("logtostderr", "false")
}
}
func runWithLogging(app *cli.Context, cfg *cmds.Server) error {
l := &lumberjack.Logger{
Filename: cfg.Log,
MaxSize: 50,
MaxBackups: 3,
MaxAge: 28,
Compress: true,
}
args := append([]string{"k3s"}, os.Args[1:]...)
cmd := reexec.Command(args...)
cmd.Env = os.Environ()
cmd.Env = append(cmd.Env, "_RIO_REEXEC_=true")
cmd.Stderr = l
cmd.Stdout = l
cmd.Stdin = os.Stdin
return cmd.Run()
}
func Run(app *cli.Context) error {
return run(app, &cmds.ServerConfig)
}
func run(app *cli.Context, cfg *cmds.Server) error {
var (
err error
)
if cfg.Log != "" && os.Getenv("_RIO_REEXEC_") == "" {
return runWithLogging(app, cfg)
}
setupLogging(app)
if !cfg.DisableAgent && os.Getuid() != 0 {
return fmt.Errorf("must run as root unless --disable-agent is specified")
}
serverConfig := server.Config{}
serverConfig.ControlConfig.ClusterSecret = cfg.ClusterSecret
serverConfig.ControlConfig.DataDir = cfg.DataDir
serverConfig.ControlConfig.KubeConfigOutput = cfg.KubeConfigOutput
serverConfig.ControlConfig.KubeConfigMode = cfg.KubeConfigMode
serverConfig.TLSConfig.HTTPSPort = cfg.HTTPSPort
serverConfig.TLSConfig.HTTPPort = cfg.HTTPPort
serverConfig.TLSConfig.KnownIPs = knownIPs()
_, serverConfig.ControlConfig.ClusterIPRange, err = net2.ParseCIDR(cfg.ClusterCIDR)
if err != nil {
return errors.Wrapf(err, "Invalid CIDR %s: %v", cfg.ClusterCIDR, err)
}
_, serverConfig.ControlConfig.ServiceIPRange, err = net2.ParseCIDR(cfg.ServiceCIDR)
if err != nil {
return errors.Wrapf(err, "Invalid CIDR %s: %v", cfg.ServiceCIDR, err)
}
// If cluster-dns CLI arg is not set, we set ClusterDNS address to be ServiceCIDR network + 10,
// i.e. when you set service-cidr to 192.168.0.0/16 and don't provide cluster-dns, it will be set to 192.168.0.10
if cfg.ClusterDNS == "" {
serverConfig.ControlConfig.ClusterDNS = make(net2.IP, 4)
copy(serverConfig.ControlConfig.ClusterDNS, serverConfig.ControlConfig.ServiceIPRange.IP.To4())
serverConfig.ControlConfig.ClusterDNS[3] = 10
} else {
serverConfig.ControlConfig.ClusterDNS = net2.ParseIP(cfg.ClusterDNS)
}
// TODO: support etcd
serverConfig.ControlConfig.NoLeaderElect = true
for _, noDeploy := range app.StringSlice("no-deploy") {
if noDeploy == "servicelb" {
serverConfig.DisableServiceLB = true
continue
}
if !strings.HasSuffix(noDeploy, ".yaml") {
noDeploy = noDeploy + ".yaml"
}
serverConfig.ControlConfig.Skips = append(serverConfig.ControlConfig.Skips, noDeploy)
}
logrus.Info("Starting k3s ", app.App.Version)
notifySocket := os.Getenv("NOTIFY_SOCKET")
os.Unsetenv("NOTIFY_SOCKET")
ctx := signal.SigTermCancelContext(context.Background())
certs, err := server.StartServer(ctx, &serverConfig)
if err != nil {
return err
}
logrus.Info("k3s is up and running")
if notifySocket != "" {
os.Setenv("NOTIFY_SOCKET", notifySocket)
systemd.SdNotify(true, "READY=1")
}
if cfg.DisableAgent {
<-ctx.Done()
return nil
}
url := fmt.Sprintf("https://localhost:%d", serverConfig.TLSConfig.HTTPSPort)
token := server.FormatToken(serverConfig.ControlConfig.Runtime.NodeToken, certs)
agentConfig := cmds.AgentConfig
agentConfig.Debug = app.GlobalBool("bool")
agentConfig.DataDir = filepath.Dir(serverConfig.ControlConfig.DataDir)
agentConfig.ServerURL = url
agentConfig.Token = token
return agent.Run(ctx, agentConfig)
}
func knownIPs() []string {
ips := []string{
"127.0.0.1",
}
ip, err := net.ChooseHostInterface()
if err == nil {
ips = append(ips, ip.String())
}
return ips
}