mirror of https://github.com/k3s-io/k3s
572 lines
23 KiB
Go
572 lines
23 KiB
Go
package server
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import (
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"context"
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"fmt"
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"net"
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"os"
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"path/filepath"
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"strings"
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"time"
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systemd "github.com/coreos/go-systemd/daemon"
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"github.com/erikdubbelboer/gspt"
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"github.com/k3s-io/k3s/pkg/agent"
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"github.com/k3s-io/k3s/pkg/agent/loadbalancer"
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"github.com/k3s-io/k3s/pkg/cli/cmds"
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"github.com/k3s-io/k3s/pkg/clientaccess"
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"github.com/k3s-io/k3s/pkg/daemons/config"
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"github.com/k3s-io/k3s/pkg/datadir"
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"github.com/k3s-io/k3s/pkg/etcd"
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"github.com/k3s-io/k3s/pkg/netutil"
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"github.com/k3s-io/k3s/pkg/rootless"
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"github.com/k3s-io/k3s/pkg/server"
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"github.com/k3s-io/k3s/pkg/token"
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"github.com/k3s-io/k3s/pkg/util"
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"github.com/k3s-io/k3s/pkg/version"
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"github.com/pkg/errors"
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"github.com/rancher/wrangler/pkg/signals"
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"github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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utilnet "k8s.io/apimachinery/pkg/util/net"
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kubeapiserverflag "k8s.io/component-base/cli/flag"
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"k8s.io/kubernetes/pkg/controlplane"
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utilsnet "k8s.io/utils/net"
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_ "github.com/go-sql-driver/mysql" // ensure we have mysql
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_ "github.com/lib/pq" // ensure we have postgres
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_ "github.com/mattn/go-sqlite3" // ensure we have sqlite
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)
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func Run(app *cli.Context) error {
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return run(app, &cmds.ServerConfig, server.CustomControllers{}, server.CustomControllers{})
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}
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func RunWithControllers(app *cli.Context, leaderControllers server.CustomControllers, controllers server.CustomControllers) error {
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return run(app, &cmds.ServerConfig, leaderControllers, controllers)
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}
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func run(app *cli.Context, cfg *cmds.Server, leaderControllers server.CustomControllers, controllers server.CustomControllers) error {
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var (
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err error
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)
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// hide process arguments from ps output, since they may contain
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// database credentials or other secrets.
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gspt.SetProcTitle(os.Args[0] + " server")
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// If the agent is enabled, evacuate cgroup v2 before doing anything else that may fork.
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// If the agent is disabled, we don't need to bother doing this as it is only the kubelet
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// that cares about cgroups.
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if !cfg.DisableAgent {
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if err := cmds.EvacuateCgroup2(); err != nil {
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return err
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}
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}
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// Initialize logging, and subprocess reaping if necessary.
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// Log output redirection and subprocess reaping both require forking.
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if err := cmds.InitLogging(); err != nil {
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return err
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}
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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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}
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if cfg.Rootless {
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dataDir, err := datadir.LocalHome(cfg.DataDir, true)
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if err != nil {
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return err
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}
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cfg.DataDir = dataDir
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if !cfg.DisableAgent {
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if err := rootless.Rootless(dataDir); err != nil {
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return err
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}
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}
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}
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if cfg.Token == "" && cfg.ClusterSecret != "" {
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logrus.Fatal("cluster-secret is deprecated. Use --token instead.")
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}
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agentReady := make(chan struct{})
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serverConfig := server.Config{}
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serverConfig.DisableAgent = cfg.DisableAgent
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serverConfig.ControlConfig.Runtime = &config.ControlRuntime{AgentReady: agentReady}
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serverConfig.ControlConfig.Token = cfg.Token
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serverConfig.ControlConfig.AgentToken = cfg.AgentToken
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serverConfig.ControlConfig.JoinURL = cfg.ServerURL
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if cfg.AgentTokenFile != "" {
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serverConfig.ControlConfig.AgentToken, err = token.ReadFile(cfg.AgentTokenFile)
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if err != nil {
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return err
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}
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}
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if cfg.TokenFile != "" {
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serverConfig.ControlConfig.Token, err = token.ReadFile(cfg.TokenFile)
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if err != nil {
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return err
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}
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}
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serverConfig.ControlConfig.DataDir = cfg.DataDir
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serverConfig.ControlConfig.KubeConfigOutput = cfg.KubeConfigOutput
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serverConfig.ControlConfig.KubeConfigMode = cfg.KubeConfigMode
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serverConfig.ControlConfig.Rootless = cfg.Rootless
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serverConfig.ControlConfig.ServiceLBNamespace = cfg.ServiceLBNamespace
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serverConfig.ControlConfig.SANs = cfg.TLSSan
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serverConfig.ControlConfig.BindAddress = cfg.BindAddress
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serverConfig.ControlConfig.SupervisorPort = cfg.SupervisorPort
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serverConfig.ControlConfig.HTTPSPort = cfg.HTTPSPort
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serverConfig.ControlConfig.APIServerPort = cfg.APIServerPort
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serverConfig.ControlConfig.APIServerBindAddress = cfg.APIServerBindAddress
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serverConfig.ControlConfig.EnablePProf = cfg.EnablePProf
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serverConfig.ControlConfig.ExtraAPIArgs = cfg.ExtraAPIArgs
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serverConfig.ControlConfig.ExtraControllerArgs = cfg.ExtraControllerArgs
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serverConfig.ControlConfig.ExtraEtcdArgs = cfg.ExtraEtcdArgs
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serverConfig.ControlConfig.ExtraSchedulerAPIArgs = cfg.ExtraSchedulerArgs
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serverConfig.ControlConfig.ClusterDomain = cfg.ClusterDomain
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serverConfig.ControlConfig.Datastore.Endpoint = cfg.DatastoreEndpoint
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serverConfig.ControlConfig.Datastore.BackendTLSConfig.CAFile = cfg.DatastoreCAFile
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serverConfig.ControlConfig.Datastore.BackendTLSConfig.CertFile = cfg.DatastoreCertFile
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serverConfig.ControlConfig.Datastore.BackendTLSConfig.KeyFile = cfg.DatastoreKeyFile
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serverConfig.ControlConfig.AdvertiseIP = cfg.AdvertiseIP
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serverConfig.ControlConfig.AdvertisePort = cfg.AdvertisePort
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serverConfig.ControlConfig.FlannelBackend = cfg.FlannelBackend
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serverConfig.ControlConfig.FlannelIPv6Masq = cfg.FlannelIPv6Masq
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serverConfig.ControlConfig.EgressSelectorMode = cfg.EgressSelectorMode
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serverConfig.ControlConfig.ExtraCloudControllerArgs = cfg.ExtraCloudControllerArgs
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serverConfig.ControlConfig.DisableCCM = cfg.DisableCCM
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serverConfig.ControlConfig.DisableNPC = cfg.DisableNPC
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serverConfig.ControlConfig.DisableHelmController = cfg.DisableHelmController
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serverConfig.ControlConfig.DisableKubeProxy = cfg.DisableKubeProxy
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serverConfig.ControlConfig.DisableETCD = cfg.DisableETCD
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serverConfig.ControlConfig.DisableAPIServer = cfg.DisableAPIServer
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serverConfig.ControlConfig.DisableScheduler = cfg.DisableScheduler
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serverConfig.ControlConfig.DisableControllerManager = cfg.DisableControllerManager
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serverConfig.ControlConfig.ClusterInit = cfg.ClusterInit
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serverConfig.ControlConfig.EncryptSecrets = cfg.EncryptSecrets
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serverConfig.ControlConfig.EtcdExposeMetrics = cfg.EtcdExposeMetrics
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serverConfig.ControlConfig.EtcdDisableSnapshots = cfg.EtcdDisableSnapshots
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if !cfg.EtcdDisableSnapshots {
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serverConfig.ControlConfig.EtcdSnapshotCompress = cfg.EtcdSnapshotCompress
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serverConfig.ControlConfig.EtcdSnapshotName = cfg.EtcdSnapshotName
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serverConfig.ControlConfig.EtcdSnapshotCron = cfg.EtcdSnapshotCron
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serverConfig.ControlConfig.EtcdSnapshotDir = cfg.EtcdSnapshotDir
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serverConfig.ControlConfig.EtcdSnapshotRetention = cfg.EtcdSnapshotRetention
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serverConfig.ControlConfig.EtcdS3 = cfg.EtcdS3
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serverConfig.ControlConfig.EtcdS3Endpoint = cfg.EtcdS3Endpoint
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serverConfig.ControlConfig.EtcdS3EndpointCA = cfg.EtcdS3EndpointCA
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serverConfig.ControlConfig.EtcdS3SkipSSLVerify = cfg.EtcdS3SkipSSLVerify
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serverConfig.ControlConfig.EtcdS3AccessKey = cfg.EtcdS3AccessKey
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serverConfig.ControlConfig.EtcdS3SecretKey = cfg.EtcdS3SecretKey
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serverConfig.ControlConfig.EtcdS3BucketName = cfg.EtcdS3BucketName
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serverConfig.ControlConfig.EtcdS3Region = cfg.EtcdS3Region
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serverConfig.ControlConfig.EtcdS3Folder = cfg.EtcdS3Folder
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serverConfig.ControlConfig.EtcdS3Insecure = cfg.EtcdS3Insecure
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serverConfig.ControlConfig.EtcdS3Timeout = cfg.EtcdS3Timeout
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} else {
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logrus.Info("ETCD snapshots are disabled")
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}
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if cfg.ClusterResetRestorePath != "" && !cfg.ClusterReset {
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return errors.New("invalid flag use; --cluster-reset required with --cluster-reset-restore-path")
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}
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serverConfig.ControlConfig.ClusterReset = cfg.ClusterReset
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serverConfig.ControlConfig.ClusterResetRestorePath = cfg.ClusterResetRestorePath
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serverConfig.ControlConfig.SystemDefaultRegistry = cfg.SystemDefaultRegistry
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if serverConfig.ControlConfig.SupervisorPort == 0 {
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serverConfig.ControlConfig.SupervisorPort = serverConfig.ControlConfig.HTTPSPort
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}
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if serverConfig.ControlConfig.DisableETCD && serverConfig.ControlConfig.JoinURL == "" {
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return errors.New("invalid flag use; --server is required with --disable-etcd")
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}
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if serverConfig.ControlConfig.DisableAPIServer {
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// Servers without a local apiserver need to connect to the apiserver via the proxy load-balancer.
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serverConfig.ControlConfig.APIServerPort = cmds.AgentConfig.LBServerPort
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// If the supervisor and externally-facing apiserver are not on the same port, the proxy will
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// have a separate load-balancer for the apiserver that we need to use instead.
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if serverConfig.ControlConfig.SupervisorPort != serverConfig.ControlConfig.HTTPSPort {
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serverConfig.ControlConfig.APIServerPort = cmds.AgentConfig.LBServerPort - 1
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}
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}
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if cmds.AgentConfig.FlannelIface != "" && len(cmds.AgentConfig.NodeIP) == 0 {
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cmds.AgentConfig.NodeIP.Set(netutil.GetIPFromInterface(cmds.AgentConfig.FlannelIface))
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}
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if serverConfig.ControlConfig.PrivateIP == "" && len(cmds.AgentConfig.NodeIP) != 0 {
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// ignoring the error here is fine since etcd will fall back to the interface's IPv4 address
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serverConfig.ControlConfig.PrivateIP, _, _ = util.GetFirstString(cmds.AgentConfig.NodeIP)
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}
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// if not set, try setting advertise-ip from agent node-external-ip
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if serverConfig.ControlConfig.AdvertiseIP == "" && len(cmds.AgentConfig.NodeExternalIP) != 0 {
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serverConfig.ControlConfig.AdvertiseIP, _, _ = util.GetFirstString(cmds.AgentConfig.NodeExternalIP)
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}
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// if not set, try setting advertise-ip from agent node-ip
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if serverConfig.ControlConfig.AdvertiseIP == "" && len(cmds.AgentConfig.NodeIP) != 0 {
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serverConfig.ControlConfig.AdvertiseIP, _, _ = util.GetFirstString(cmds.AgentConfig.NodeIP)
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}
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// if we ended up with any advertise-ips, ensure they're added to the SAN list;
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// note that kube-apiserver does not support dual-stack advertise-ip as of 1.21.0:
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/// https://github.com/kubernetes/kubeadm/issues/1612#issuecomment-772583989
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if serverConfig.ControlConfig.AdvertiseIP != "" {
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serverConfig.ControlConfig.SANs = append(serverConfig.ControlConfig.SANs, serverConfig.ControlConfig.AdvertiseIP)
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}
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// Ensure that we add the localhost name/ip and node name/ip to the SAN list. This list is shared by the
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// certs for the supervisor, kube-apiserver cert, and etcd. DNS entries for the in-cluster kubernetes
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// service endpoint are added later when the certificates are created.
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nodeName, nodeIPs, err := util.GetHostnameAndIPs(cmds.AgentConfig.NodeName, cmds.AgentConfig.NodeIP)
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if err != nil {
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return err
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}
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serverConfig.ControlConfig.ServerNodeName = nodeName
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serverConfig.ControlConfig.SANs = append(serverConfig.ControlConfig.SANs, "127.0.0.1", "::1", "localhost", nodeName)
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for _, ip := range nodeIPs {
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serverConfig.ControlConfig.SANs = append(serverConfig.ControlConfig.SANs, ip.String())
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}
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// configure ClusterIPRanges
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_, _, IPv6only, _ := util.GetFirstIP(nodeIPs)
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if len(cmds.ServerConfig.ClusterCIDR) == 0 {
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clusterCIDR := "10.42.0.0/16"
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if IPv6only {
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clusterCIDR = "fd00:42::/56"
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}
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cmds.ServerConfig.ClusterCIDR.Set(clusterCIDR)
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}
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for _, cidr := range cmds.ServerConfig.ClusterCIDR {
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for _, v := range strings.Split(cidr, ",") {
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_, parsed, err := net.ParseCIDR(v)
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if err != nil {
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return errors.Wrapf(err, "invalid cluster-cidr %s", v)
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}
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serverConfig.ControlConfig.ClusterIPRanges = append(serverConfig.ControlConfig.ClusterIPRanges, parsed)
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}
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}
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// set ClusterIPRange to the first IPv4 block, for legacy clients
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// unless only IPv6 range given
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clusterIPRange, err := util.GetFirstNet(serverConfig.ControlConfig.ClusterIPRanges)
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if err != nil {
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return errors.Wrap(err, "cannot configure IPv4/IPv6 cluster-cidr")
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}
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serverConfig.ControlConfig.ClusterIPRange = clusterIPRange
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// configure ServiceIPRanges
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if len(cmds.ServerConfig.ServiceCIDR) == 0 {
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serviceCIDR := "10.43.0.0/16"
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if IPv6only {
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serviceCIDR = "fd00:43::/112"
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}
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cmds.ServerConfig.ServiceCIDR.Set(serviceCIDR)
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}
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for _, cidr := range cmds.ServerConfig.ServiceCIDR {
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for _, v := range strings.Split(cidr, ",") {
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_, parsed, err := net.ParseCIDR(v)
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if err != nil {
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return errors.Wrapf(err, "invalid service-cidr %s", v)
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}
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serverConfig.ControlConfig.ServiceIPRanges = append(serverConfig.ControlConfig.ServiceIPRanges, parsed)
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}
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}
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// set ServiceIPRange to the first IPv4 block, for legacy clients
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// unless only IPv6 range given
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serviceIPRange, err := util.GetFirstNet(serverConfig.ControlConfig.ServiceIPRanges)
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if err != nil {
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return errors.Wrap(err, "cannot configure IPv4/IPv6 service-cidr")
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}
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serverConfig.ControlConfig.ServiceIPRange = serviceIPRange
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serverConfig.ControlConfig.ServiceNodePortRange, err = utilnet.ParsePortRange(cfg.ServiceNodePortRange)
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if err != nil {
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return errors.Wrapf(err, "invalid port range %s", cfg.ServiceNodePortRange)
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}
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// the apiserver service does not yet support dual-stack operation
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_, apiServerServiceIP, err := controlplane.ServiceIPRange(*serverConfig.ControlConfig.ServiceIPRange)
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if err != nil {
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return err
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}
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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 the first IPv4 ServiceCIDR network + 10,
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// 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
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// If there are no IPv4 ServiceCIDRs, an IPv6 ServiceCIDRs will be used.
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// If neither of IPv4 or IPv6 are found an error is raised.
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if len(cmds.ServerConfig.ClusterDNS) == 0 {
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clusterDNS, err := utilsnet.GetIndexedIP(serverConfig.ControlConfig.ServiceIPRange, 10)
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if err != nil {
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return errors.Wrap(err, "cannot configure default cluster-dns address")
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}
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serverConfig.ControlConfig.ClusterDNS = clusterDNS
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serverConfig.ControlConfig.ClusterDNSs = []net.IP{serverConfig.ControlConfig.ClusterDNS}
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} else {
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for _, ip := range cmds.ServerConfig.ClusterDNS {
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for _, v := range strings.Split(ip, ",") {
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parsed := net.ParseIP(v)
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if parsed == nil {
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return fmt.Errorf("invalid cluster-dns address %s", v)
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}
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serverConfig.ControlConfig.ClusterDNSs = append(serverConfig.ControlConfig.ClusterDNSs, parsed)
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}
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}
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// Set ClusterDNS to the first IPv4 address, for legacy clients
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// unless only IPv6 range given
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clusterDNS, _, _, err := util.GetFirstIP(serverConfig.ControlConfig.ClusterDNSs)
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if err != nil {
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return errors.Wrap(err, "cannot configure IPv4/IPv6 cluster-dns address")
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}
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serverConfig.ControlConfig.ClusterDNS = clusterDNS
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}
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if err := validateNetworkConfiguration(serverConfig); err != nil {
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return err
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}
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if cfg.DefaultLocalStoragePath == "" {
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dataDir, err := datadir.LocalHome(cfg.DataDir, false)
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if err != nil {
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return err
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}
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serverConfig.ControlConfig.DefaultLocalStoragePath = filepath.Join(dataDir, "/storage")
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} else {
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serverConfig.ControlConfig.DefaultLocalStoragePath = cfg.DefaultLocalStoragePath
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}
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serverConfig.ControlConfig.Skips = map[string]bool{}
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if noDeploy := app.StringSlice("no-deploy"); len(noDeploy) > 0 {
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logrus.Fatal("no-deploy flag is deprecated. Use --disable instead.")
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}
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serverConfig.ControlConfig.Disables = map[string]bool{}
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for _, disable := range app.StringSlice("disable") {
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for _, v := range strings.Split(disable, ",") {
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v = strings.TrimSpace(v)
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serverConfig.ControlConfig.Skips[v] = true
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serverConfig.ControlConfig.Disables[v] = true
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}
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}
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if serverConfig.ControlConfig.Skips["servicelb"] {
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serverConfig.ControlConfig.DisableServiceLB = true
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}
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if serverConfig.ControlConfig.DisableCCM {
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serverConfig.ControlConfig.Skips["ccm"] = true
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serverConfig.ControlConfig.Disables["ccm"] = true
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}
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tlsMinVersionArg := getArgValueFromList("tls-min-version", cfg.ExtraAPIArgs)
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serverConfig.ControlConfig.TLSMinVersion, err = kubeapiserverflag.TLSVersion(tlsMinVersionArg)
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if err != nil {
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return errors.Wrap(err, "invalid tls-min-version")
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}
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serverConfig.StartupHooks = append(serverConfig.StartupHooks, cfg.StartupHooks...)
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serverConfig.LeaderControllers = append(serverConfig.LeaderControllers, leaderControllers...)
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serverConfig.Controllers = append(serverConfig.Controllers, controllers...)
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// TLS config based on mozilla ssl-config generator
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// https://ssl-config.mozilla.org/#server=golang&version=1.13.6&config=intermediate&guideline=5.4
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// Need to disable the TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 Cipher for TLS1.2
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tlsCipherSuitesArg := getArgValueFromList("tls-cipher-suites", cfg.ExtraAPIArgs)
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tlsCipherSuites := strings.Split(tlsCipherSuitesArg, ",")
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for i := range tlsCipherSuites {
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tlsCipherSuites[i] = strings.TrimSpace(tlsCipherSuites[i])
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}
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if len(tlsCipherSuites) == 0 || tlsCipherSuites[0] == "" {
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tlsCipherSuites = []string{
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"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
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"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
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"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
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"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
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"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
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"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305",
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}
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}
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serverConfig.ControlConfig.TLSCipherSuites, err = kubeapiserverflag.TLSCipherSuites(tlsCipherSuites)
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if err != nil {
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return errors.Wrap(err, "invalid tls-cipher-suites")
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}
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// If performing a cluster reset, make sure control-plane components are
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// disabled so we only perform a reset or restore and bail out.
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if cfg.ClusterReset {
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serverConfig.ControlConfig.ClusterInit = true
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serverConfig.ControlConfig.DisableAPIServer = true
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serverConfig.ControlConfig.DisableControllerManager = true
|
|
serverConfig.ControlConfig.DisableScheduler = true
|
|
serverConfig.ControlConfig.DisableCCM = true
|
|
|
|
// If the supervisor and apiserver are on the same port, everything is running embedded
|
|
// and we don't need the kubelet or containerd up to perform a cluster reset.
|
|
if serverConfig.ControlConfig.SupervisorPort == serverConfig.ControlConfig.HTTPSPort {
|
|
cfg.DisableAgent = true
|
|
}
|
|
|
|
dataDir, err := datadir.LocalHome(cfg.DataDir, false)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// delete local loadbalancers state for apiserver and supervisor servers
|
|
loadbalancer.ResetLoadBalancer(filepath.Join(dataDir, "agent"), loadbalancer.SupervisorServiceName)
|
|
loadbalancer.ResetLoadBalancer(filepath.Join(dataDir, "agent"), loadbalancer.APIServerServiceName)
|
|
|
|
if cfg.ClusterResetRestorePath != "" {
|
|
// at this point we're doing a restore. Check to see if we've
|
|
// passed in a token and if not, check if the token file exists.
|
|
// If it doesn't, return an error indicating the token is necessary.
|
|
if cfg.Token == "" {
|
|
tokenFile := filepath.Join(dataDir, "server", "token")
|
|
if _, err := os.Stat(tokenFile); err != nil {
|
|
if os.IsNotExist(err) {
|
|
return errors.New(tokenFile + " does not exist, please pass --token to complete the restoration")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
logrus.Info("Starting " + version.Program + " " + app.App.Version)
|
|
|
|
notifySocket := os.Getenv("NOTIFY_SOCKET")
|
|
os.Unsetenv("NOTIFY_SOCKET")
|
|
|
|
ctx := signals.SetupSignalContext()
|
|
|
|
if err := server.StartServer(ctx, &serverConfig, cfg); err != nil {
|
|
return err
|
|
}
|
|
|
|
go func() {
|
|
if !serverConfig.ControlConfig.DisableAPIServer {
|
|
<-serverConfig.ControlConfig.Runtime.APIServerReady
|
|
logrus.Info("Kube API server is now running")
|
|
serverConfig.ControlConfig.Runtime.StartupHooksWg.Wait()
|
|
}
|
|
if !serverConfig.ControlConfig.DisableETCD {
|
|
<-serverConfig.ControlConfig.Runtime.ETCDReady
|
|
logrus.Info("ETCD server is now running")
|
|
}
|
|
|
|
logrus.Info(version.Program + " is up and running")
|
|
os.Setenv("NOTIFY_SOCKET", notifySocket)
|
|
systemd.SdNotify(true, "READY=1\n")
|
|
}()
|
|
|
|
url := fmt.Sprintf("https://%s:%d", serverConfig.ControlConfig.BindAddressOrLoopback(false, true), serverConfig.ControlConfig.SupervisorPort)
|
|
token, err := clientaccess.FormatToken(serverConfig.ControlConfig.Runtime.AgentToken, serverConfig.ControlConfig.Runtime.ServerCA)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
agentConfig := cmds.AgentConfig
|
|
agentConfig.AgentReady = agentReady
|
|
agentConfig.Debug = app.GlobalBool("debug")
|
|
agentConfig.DataDir = filepath.Dir(serverConfig.ControlConfig.DataDir)
|
|
agentConfig.ServerURL = url
|
|
agentConfig.Token = token
|
|
agentConfig.DisableLoadBalancer = !serverConfig.ControlConfig.DisableAPIServer
|
|
agentConfig.DisableServiceLB = serverConfig.ControlConfig.DisableServiceLB
|
|
agentConfig.ETCDAgent = serverConfig.ControlConfig.DisableAPIServer
|
|
agentConfig.ClusterReset = serverConfig.ControlConfig.ClusterReset
|
|
agentConfig.Rootless = cfg.Rootless
|
|
|
|
if agentConfig.Rootless {
|
|
// let agent specify Rootless kubelet flags, but not unshare twice
|
|
agentConfig.RootlessAlreadyUnshared = true
|
|
}
|
|
|
|
if serverConfig.ControlConfig.DisableAPIServer {
|
|
if cfg.ServerURL == "" {
|
|
// If this node is the initial member of the cluster and is not hosting an apiserver,
|
|
// always bootstrap the agent off local supervisor, and go through the process of reading
|
|
// apiserver endpoints from etcd and blocking further startup until one is available.
|
|
// This ensures that we don't end up in a chicken-and-egg situation on cluster restarts,
|
|
// where the loadbalancer is routing traffic to existing apiservers, but the apiservers
|
|
// are non-functional because they're waiting for us to start etcd.
|
|
loadbalancer.ResetLoadBalancer(filepath.Join(agentConfig.DataDir, "agent"), loadbalancer.SupervisorServiceName)
|
|
} else {
|
|
// If this is a secondary member of the cluster and is not hosting an apiserver,
|
|
// bootstrap the agent off the existing supervisor, instead of bootstrapping locally.
|
|
agentConfig.ServerURL = cfg.ServerURL
|
|
}
|
|
// initialize the apiAddress Channel for receiving the api address from etcd
|
|
agentConfig.APIAddressCh = make(chan []string)
|
|
go getAPIAddressFromEtcd(ctx, serverConfig, agentConfig)
|
|
}
|
|
|
|
if cfg.DisableAgent {
|
|
agentConfig.ContainerRuntimeEndpoint = "/dev/null"
|
|
return agent.RunStandalone(ctx, agentConfig)
|
|
}
|
|
|
|
return agent.Run(ctx, agentConfig)
|
|
}
|
|
|
|
// validateNetworkConfig ensures that the network configuration values make sense.
|
|
func validateNetworkConfiguration(serverConfig server.Config) error {
|
|
// Dual-stack operation requires fairly extensive manual configuration at the moment - do some
|
|
// preflight checks to make sure that the user isn't trying to use flannel/npc, or trying to
|
|
// enable dual-stack DNS (which we don't currently support since it's not easy to template)
|
|
dualDNS, err := utilsnet.IsDualStackIPs(serverConfig.ControlConfig.ClusterDNSs)
|
|
if err != nil {
|
|
return errors.Wrap(err, "failed to validate cluster-dns")
|
|
}
|
|
|
|
if dualDNS == true {
|
|
return errors.New("dual-stack cluster-dns is not supported")
|
|
}
|
|
|
|
switch serverConfig.ControlConfig.EgressSelectorMode {
|
|
case config.EgressSelectorModeAgent, config.EgressSelectorModeCluster,
|
|
config.EgressSelectorModeDisabled, config.EgressSelectorModePod:
|
|
default:
|
|
return fmt.Errorf("invalid egress-selector-mode %s", serverConfig.ControlConfig.EgressSelectorMode)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func getArgValueFromList(searchArg string, argList []string) string {
|
|
var value string
|
|
for _, arg := range argList {
|
|
splitArg := strings.SplitN(arg, "=", 2)
|
|
if splitArg[0] == searchArg {
|
|
value = splitArg[1]
|
|
// break if we found our value
|
|
break
|
|
}
|
|
}
|
|
return value
|
|
}
|
|
|
|
func getAPIAddressFromEtcd(ctx context.Context, serverConfig server.Config, agentConfig cmds.Agent) {
|
|
defer close(agentConfig.APIAddressCh)
|
|
for {
|
|
toCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
|
|
defer cancel()
|
|
serverAddresses, err := etcd.GetAPIServerURLsFromETCD(toCtx, &serverConfig.ControlConfig)
|
|
if err == nil && len(serverAddresses) > 0 {
|
|
agentConfig.APIAddressCh <- serverAddresses
|
|
break
|
|
}
|
|
if !errors.Is(err, etcd.ErrAddressNotSet) {
|
|
logrus.Warnf("Failed to get apiserver address from etcd: %v", err)
|
|
}
|
|
<-toCtx.Done()
|
|
}
|
|
}
|