k3s/pkg/cli/server/server.go

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package server
import (
"context"
"fmt"
net2 "net"
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"os"
"path/filepath"
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"strings"
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systemd "github.com/coreos/go-systemd/daemon"
"github.com/pkg/errors"
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"github.com/rancher/k3s/pkg/agent"
"github.com/rancher/k3s/pkg/cli/cmds"
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"github.com/rancher/k3s/pkg/datadir"
"github.com/rancher/k3s/pkg/netutil"
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"github.com/rancher/k3s/pkg/rootless"
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"github.com/rancher/k3s/pkg/server"
"github.com/rancher/k3s/pkg/token"
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"github.com/rancher/wrangler/pkg/signals"
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"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"k8s.io/apimachinery/pkg/util/net"
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"k8s.io/kubernetes/pkg/master"
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_ "github.com/go-sql-driver/mysql" // ensure we have mysql
_ "github.com/lib/pq" // ensure we have postgres
_ "github.com/mattn/go-sqlite3" // ensure we have sqlite
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)
func Run(app *cli.Context) error {
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if err := cmds.InitLogging(); err != nil {
return err
}
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return run(app, &cmds.ServerConfig)
}
func run(app *cli.Context, cfg *cmds.Server) error {
var (
err error
)
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if !cfg.DisableAgent && os.Getuid() != 0 && !cfg.Rootless {
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return fmt.Errorf("must run as root unless --disable-agent is specified")
}
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if cfg.Rootless {
dataDir, err := datadir.LocalHome(cfg.DataDir, true)
if err != nil {
return err
}
cfg.DataDir = dataDir
if err := rootless.Rootless(dataDir); err != nil {
return err
}
}
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if cfg.Token == "" && cfg.ClusterSecret != "" {
cfg.Token = cfg.ClusterSecret
}
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serverConfig := server.Config{}
serverConfig.DisableAgent = cfg.DisableAgent
serverConfig.ControlConfig.Token = cfg.Token
serverConfig.ControlConfig.AgentToken = cfg.AgentToken
serverConfig.ControlConfig.JoinURL = cfg.ServerURL
if cfg.AgentTokenFile != "" {
serverConfig.ControlConfig.AgentToken, err = token.ReadFile(cfg.AgentTokenFile)
if err != nil {
return err
}
}
if cfg.TokenFile != "" {
serverConfig.ControlConfig.Token, err = token.ReadFile(cfg.TokenFile)
if err != nil {
return err
}
}
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serverConfig.ControlConfig.DataDir = cfg.DataDir
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serverConfig.ControlConfig.KubeConfigOutput = cfg.KubeConfigOutput
serverConfig.ControlConfig.KubeConfigMode = cfg.KubeConfigMode
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serverConfig.ControlConfig.NoScheduler = cfg.DisableScheduler
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serverConfig.Rootless = cfg.Rootless
serverConfig.ControlConfig.SANs = knownIPs(cfg.TLSSan)
serverConfig.ControlConfig.BindAddress = cfg.BindAddress
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serverConfig.ControlConfig.HTTPSPort = cfg.HTTPSPort
serverConfig.ControlConfig.ExtraAPIArgs = cfg.ExtraAPIArgs
serverConfig.ControlConfig.ExtraControllerArgs = cfg.ExtraControllerArgs
serverConfig.ControlConfig.ExtraSchedulerAPIArgs = cfg.ExtraSchedulerArgs
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serverConfig.ControlConfig.ClusterDomain = cfg.ClusterDomain
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serverConfig.ControlConfig.Datastore.Endpoint = cfg.DatastoreEndpoint
serverConfig.ControlConfig.Datastore.CAFile = cfg.DatastoreCAFile
serverConfig.ControlConfig.Datastore.CertFile = cfg.DatastoreCertFile
serverConfig.ControlConfig.Datastore.KeyFile = cfg.DatastoreKeyFile
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serverConfig.ControlConfig.AdvertiseIP = cfg.AdvertiseIP
serverConfig.ControlConfig.AdvertisePort = cfg.AdvertisePort
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serverConfig.ControlConfig.FlannelBackend = cfg.FlannelBackend
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serverConfig.ControlConfig.ExtraCloudControllerArgs = cfg.ExtraCloudControllerArgs
serverConfig.ControlConfig.DisableCCM = cfg.DisableCCM
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serverConfig.ControlConfig.DisableNPC = cfg.DisableNPC
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serverConfig.ControlConfig.DisableKubeProxy = cfg.DisableKubeProxy
serverConfig.ControlConfig.ClusterInit = cfg.ClusterInit
serverConfig.ControlConfig.ClusterReset = cfg.ClusterReset
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serverConfig.ControlConfig.EncryptSecrets = cfg.EncryptSecrets
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if cmds.AgentConfig.FlannelIface != "" && cmds.AgentConfig.NodeIP == "" {
cmds.AgentConfig.NodeIP = netutil.GetIPFromInterface(cmds.AgentConfig.FlannelIface)
}
if serverConfig.ControlConfig.AdvertiseIP == "" && cmds.AgentConfig.NodeExternalIP != "" {
serverConfig.ControlConfig.AdvertiseIP = cmds.AgentConfig.NodeExternalIP
}
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if serverConfig.ControlConfig.AdvertiseIP == "" && cmds.AgentConfig.NodeIP != "" {
serverConfig.ControlConfig.AdvertiseIP = cmds.AgentConfig.NodeIP
}
if serverConfig.ControlConfig.AdvertiseIP != "" {
serverConfig.ControlConfig.SANs = append(serverConfig.ControlConfig.SANs, serverConfig.ControlConfig.AdvertiseIP)
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}
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_, serverConfig.ControlConfig.ClusterIPRange, err = net2.ParseCIDR(cfg.ClusterCIDR)
if err != nil {
return errors.Wrapf(err, "Invalid CIDR %s: %v", cfg.ClusterCIDR, err)
}
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_, serverConfig.ControlConfig.ServiceIPRange, err = net2.ParseCIDR(cfg.ServiceCIDR)
if err != nil {
return errors.Wrapf(err, "Invalid CIDR %s: %v", cfg.ServiceCIDR, err)
}
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_, apiServerServiceIP, err := master.ServiceIPRange(*serverConfig.ControlConfig.ServiceIPRange)
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if err != nil {
return err
}
serverConfig.ControlConfig.SANs = append(serverConfig.ControlConfig.SANs, apiServerServiceIP.String())
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// 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)
}
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if cfg.DefaultLocalStoragePath == "" {
dataDir, err := datadir.LocalHome(cfg.DataDir, false)
if err != nil {
return err
}
serverConfig.ControlConfig.DefaultLocalStoragePath = filepath.Join(dataDir, "/storage")
} else {
serverConfig.ControlConfig.DefaultLocalStoragePath = cfg.DefaultLocalStoragePath
}
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serverConfig.ControlConfig.Skips = map[string]bool{}
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for _, noDeploy := range app.StringSlice("no-deploy") {
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for _, v := range strings.Split(noDeploy, ",") {
v = strings.TrimSpace(v)
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serverConfig.ControlConfig.Skips[v] = true
}
}
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serverConfig.ControlConfig.Disables = map[string]bool{}
for _, disable := range app.StringSlice("disable") {
for _, v := range strings.Split(disable, ",") {
v = strings.TrimSpace(v)
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serverConfig.ControlConfig.Skips[v] = true
serverConfig.ControlConfig.Disables[v] = true
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}
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}
if serverConfig.ControlConfig.Skips["servicelb"] {
serverConfig.DisableServiceLB = true
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}
if serverConfig.ControlConfig.DisableCCM {
serverConfig.ControlConfig.Skips["ccm"] = true
serverConfig.ControlConfig.Disables["ccm"] = true
}
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logrus.Info("Starting k3s ", app.App.Version)
notifySocket := os.Getenv("NOTIFY_SOCKET")
os.Unsetenv("NOTIFY_SOCKET")
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ctx := signals.SetupSignalHandler(context.Background())
if err := server.StartServer(ctx, &serverConfig); err != nil {
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return err
}
logrus.Info("k3s is up and running")
if notifySocket != "" {
os.Setenv("NOTIFY_SOCKET", notifySocket)
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systemd.SdNotify(true, "READY=1\n")
}
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if cfg.DisableAgent {
<-ctx.Done()
return nil
}
ip := serverConfig.ControlConfig.BindAddress
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if ip == "" {
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ip = "127.0.0.1"
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}
url := fmt.Sprintf("https://%s:%d", ip, serverConfig.ControlConfig.HTTPSPort)
token, err := server.FormatToken(serverConfig.ControlConfig.Runtime.AgentToken, serverConfig.ControlConfig.Runtime.ServerCA)
if err != nil {
return err
}
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agentConfig := cmds.AgentConfig
agentConfig.Debug = app.GlobalBool("bool")
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agentConfig.DataDir = filepath.Dir(serverConfig.ControlConfig.DataDir)
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agentConfig.ServerURL = url
agentConfig.Token = token
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agentConfig.DisableLoadBalancer = true
agentConfig.Rootless = cfg.Rootless
if agentConfig.Rootless {
// let agent specify Rootless kubelet flags, but not unshare twice
agentConfig.RootlessAlreadyUnshared = true
}
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return agent.Run(ctx, agentConfig)
}
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func knownIPs(ips []string) []string {
ips = append(ips, "127.0.0.1")
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ip, err := net.ChooseHostInterface()
if err == nil {
ips = append(ips, ip.String())
}
return ips
}