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main.go
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main.go
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package main
import (
"fmt"
"os"
"os/signal"
"path"
"strings"
"syscall"
"github.com/alibaba/pouch/apis/metrics"
"github.com/alibaba/pouch/apis/opts"
optscfg "github.com/alibaba/pouch/apis/opts/config"
"github.com/alibaba/pouch/apis/types"
"github.com/alibaba/pouch/daemon"
"github.com/alibaba/pouch/daemon/config"
"github.com/alibaba/pouch/lxcfs"
"github.com/alibaba/pouch/pkg/debug"
"github.com/alibaba/pouch/pkg/kernel"
"github.com/alibaba/pouch/pkg/log"
"github.com/alibaba/pouch/pkg/system"
"github.com/alibaba/pouch/pkg/utils"
"github.com/alibaba/pouch/storage/quota"
"github.com/alibaba/pouch/version"
"github.com/containerd/containerd/namespaces"
"github.com/docker/docker/pkg/reexec"
"github.com/google/gops/agent"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
var (
sigHandles []func() error
printVersion bool
logOpts []string
cfg = &config.Config{}
)
var rootCmd = &cobra.Command{
Use: "pouchd",
Short: "An Efficient Enterprise-class Container Engine",
Args: cobra.NoArgs,
SilenceUsage: true,
DisableAutoGenTag: true, // disable displaying auto generation tag in cli docs
RunE: func(cmd *cobra.Command, args []string) error {
return runDaemon(cmd)
},
}
func main() {
if reexec.Init() {
return
}
setupFlags(rootCmd)
if err := rootCmd.Execute(); err != nil {
log.With(nil).Error(err)
os.Exit(1)
}
}
// setupFlags setups flags for command line.
func setupFlags(cmd *cobra.Command) {
// Cobra supports Persistent Flags, which, if defined here,
// will be global for your application.
// flagSet := cmd.PersistentFlags()
// Cobra also supports local flags, which will only run
// when this action is called directly.
flagSet := cmd.Flags()
flagSet.StringVar(&cfg.HomeDir, "home-dir", "/var/lib/pouch", "Specify root dir of pouchd")
flagSet.StringArrayVarP(&cfg.Listen, "listen", "l", []string{"unix:///var/run/pouchd.sock"}, "Specify listening addresses of Pouchd")
flagSet.BoolVar(&cfg.IsCriEnabled, "enable-cri", false, "Specify whether enable the cri part of pouchd which is used to support Kubernetes")
flagSet.StringVar(&cfg.CriConfig.CriVersion, "cri-version", "v1alpha2", "Specify the version of cri which is used to support Kubernetes")
flagSet.StringVar(&cfg.CriConfig.Listen, "listen-cri", "unix:///var/run/pouchcri.sock", "Specify listening address of CRI")
flagSet.StringVar(&cfg.CriConfig.NetworkPluginBinDir, "cni-bin-dir", "/opt/cni/bin", "The directory for putting cni plugin binaries.")
flagSet.StringVar(&cfg.CriConfig.NetworkPluginConfDir, "cni-conf-dir", "/etc/cni/net.d", "The directory for putting cni plugin configuration files.")
flagSet.StringVar(&cfg.CriConfig.SandboxImage, "sandbox-image", "registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0", "The image used by sandbox container.")
flagSet.StringVar(&cfg.CriConfig.StreamServerPort, "stream-server-port", "10010", "The port stream server of cri is listening on.")
flagSet.BoolVar(&cfg.CriConfig.StreamServerReusePort, "stream-server-reuse-port", false, "Specify whether cri stream server share port with pouchd. If this is true, the listen option of pouchd should specify a tcp socket and its port should be same with stream-server-port.")
flagSet.IntVar(&cfg.CriConfig.CriStatsCollectPeriod, "cri-stats-collect-period", 10, "The time duration (in time.Second) cri collect stats from containerd.")
flagSet.BoolVar(&cfg.CriConfig.EnableCriStatsCollect, "enable-cri-stats-collect", false, "Specify whether cri collect stats from containerd. If this is true, option CriStatsCollectPeriod will take effect.")
flagSet.StringVar(&cfg.CriConfig.RuntimeConfigFile, "cni-runtime-config", "/etc/pouch/cni-runtime-config.json", "A config file to make the cni runtime config persistent.")
flagSet.BoolVarP(&cfg.Debug, "debug", "D", false, "Switch daemon log level to DEBUG mode")
flagSet.StringVarP(&cfg.ContainerdAddr, "containerd", "c", "/var/run/containerd.sock", "Specify listening address of containerd")
flagSet.StringVar(&cfg.ContainerdPath, "containerd-path", "", "Specify the path of containerd binary")
flagSet.StringVar(&cfg.TLS.Key, "tlskey", "", "Specify key file of TLS")
flagSet.StringVar(&cfg.TLS.Cert, "tlscert", "", "Specify cert file of TLS")
flagSet.StringVar(&cfg.TLS.CA, "tlscacert", "", "Specify CA file of TLS")
flagSet.BoolVar(&cfg.TLS.VerifyRemote, "tlsverify", false, "Use TLS and verify remote")
flagSet.StringVar(&cfg.TLS.ManagerWhiteList, "manager-whitelist", "", "Set tls name whitelist, multiple values are separated by commas")
flagSet.BoolVarP(&printVersion, "version", "v", false, "Print daemon version")
flagSet.StringVar(&cfg.DefaultRuntime, "default-runtime", "runc", "Default OCI Runtime")
flagSet.BoolVar(&cfg.IsLxcfsEnabled, "enable-lxcfs", false, "Enable Lxcfs to make container to isolate /proc")
flagSet.StringVar(&cfg.LxcfsBinPath, "lxcfs", "/usr/local/bin/lxcfs", "Specify the path of lxcfs binary")
flagSet.StringVar(&cfg.LxcfsHome, "lxcfs-home", "/var/lib/lxcfs", "Specify the mount dir of lxcfs")
flagSet.StringVar(&cfg.DefaultRegistry, "default-registry", "registry.hub.docker.com", "Default Image Registry")
flagSet.StringVar(&cfg.DefaultRegistryNS, "default-registry-namespace", "library", "Default Image Registry namespace")
flagSet.StringVar(&cfg.ImageProxy, "image-proxy", "", "Http proxy to pull image")
flagSet.StringVar(&cfg.QuotaDriver, "quota-driver", "", "Set quota driver(grpquota/prjquota), if not set, it will set by kernel version")
flagSet.StringVar(&cfg.ConfigFile, "config-file", "/etc/pouch/config.json", "Configuration file of pouchd")
flagSet.StringVar(&cfg.Snapshotter, "snapshotter", "overlayfs", "Snapshotter driver of pouchd, it will be passed to containerd")
flagSet.BoolVar(&cfg.AllowMultiSnapshotter, "allow-multi-snapshotter", false, "If set true, pouchd will allow multi snapshotter")
// volume config
flagSet.StringVar(&cfg.VolumeConfig.DriverAlias, "volume-driver-alias", "", "Set volume driver alias, <name=alias>[;name1=alias1]")
// network config
flagSet.StringVar(&cfg.NetworkConfig.ExecRoot, "exec-root-dir", "", "Set exec root directory for network")
flagSet.StringVar(&cfg.NetworkConfig.BridgeConfig.Name, "bridge-name", "", "Set default bridge name")
flagSet.StringVar(&cfg.NetworkConfig.BridgeConfig.IPv4, "bip", "", "Set bridge IP")
flagSet.StringVar(&cfg.NetworkConfig.BridgeConfig.GatewayIPv4, "default-gateway", "", "Set default IPv4 bridge gateway")
flagSet.StringVar(&cfg.NetworkConfig.BridgeConfig.FixedCIDRv4, "fixed-cidr", "", "Set bridge fixed CIDRv4")
flagSet.BoolVar(&cfg.NetworkConfig.BridgeConfig.EnableIPv6, "enable-ipv6", false, "Enable IPv6 networking")
flagSet.StringVar(&cfg.NetworkConfig.BridgeConfig.GatewayIPv6, "default-gateway-v6", "", "Set default IPv6 bridge gateway")
flagSet.StringVar(&cfg.NetworkConfig.BridgeConfig.FixedCIDRv6, "fixed-cidr-v6", "", "Set bridge fixed CIDRv6")
flagSet.IntVar(&cfg.NetworkConfig.BridgeConfig.Mtu, "mtu", 1500, "Set bridge MTU")
flagSet.BoolVar(&cfg.NetworkConfig.BridgeConfig.IPTables, "iptables", true, "Enable iptables")
flagSet.BoolVar(&cfg.NetworkConfig.BridgeConfig.IPForward, "ipforward", true, "Enable ipforward")
flagSet.BoolVar(&cfg.NetworkConfig.BridgeConfig.UserlandProxy, "userland-proxy", false, "Enable userland proxy")
// log config
flagSet.StringVar(&cfg.DefaultLogConfig.LogDriver, "log-driver", types.LogConfigLogDriverJSONFile, "Set default log driver")
flagSet.StringArrayVar(&logOpts, "log-opt", nil, "Set default log driver options")
// cgroup-path flag is to set parent cgroup for all containers, default is "default" staying with containerd's configuration.
flagSet.StringVar(&cfg.CgroupParent, "cgroup-parent", "", "Set parent cgroup for all containers")
flagSet.StringSliceVar(&cfg.Labels, "label", []string{}, "Set metadata for Pouch daemon")
flagSet.BoolVar(&cfg.EnableProfiler, "enable-profiler", false, "Set if pouchd setup profiler")
flagSet.StringVar(&cfg.Pidfile, "pidfile", "/var/run/pouch.pid", "Save daemon pid")
flagSet.IntVar(&cfg.OOMScoreAdjust, "oom-score-adj", -500, "Set the oom_score_adj for the daemon")
flagSet.Var(optscfg.NewRuntime(&cfg.Runtimes), "add-runtime", "register a OCI runtime to daemon")
// Notes(ziren): default-namespace is passed to containerd, the default
// value is 'default'. So if IsCriEnabled is true for k8s, we should set the DefaultNamespace
// to k8s.io
flagSet.StringVar(&cfg.DefaultNamespace, "default-namespace", namespaces.Default, "default-namespace is passed to containerd, the default value is 'default'")
flagSet.StringVar(&cfg.CgroupDriver, "cgroup-driver", "cgroupfs", "Set cgroup driver for all containers(cgroupfs|systemd), default cgroupfs")
// registry
flagSet.StringArrayVar(&cfg.InsecureRegistries, "insecure-registries", []string{}, "enable insecure registry")
flagSet.StringArrayVar(&cfg.RegistryMirrors, "registry-mirrors", []string{}, "preferred mirror registry list")
// buildkit
flagSet.BoolVar(&cfg.EnableBuilder, "enable-builder", false, "Enable buildkit functionality")
}
// runDaemon prepares configs, setups essential details and runs pouchd daemon.
func runDaemon(cmd *cobra.Command) error {
// parse log driver config
logOptMap, err := opts.ParseLogOptions(cfg.DefaultLogConfig.LogDriver, logOpts)
if err != nil {
return err
}
if len(logOptMap) > 0 {
cfg.DefaultLogConfig.LogOpts = logOptMap
}
if err := loadDaemonFile(cfg, cmd.Flags()); err != nil {
return fmt.Errorf("failed to load daemon file: %s", err)
}
//user specifies --version or -v, print version and return.
if printVersion {
fmt.Printf("pouchd version: %s, build: %s, build at: %s\n", version.Version, version.GitCommit, version.BuildTime)
return nil
}
kernelVersion, err := kernel.GetKernelVersion()
if err != nil {
return fmt.Errorf("failed to get kernel version: %s", err)
}
metrics.EngineVersion.WithLabelValues(
version.GitCommit,
version.Version,
kernelVersion.String()).Set(1)
// initialize log.
log.Init(cfg.Debug)
if err := cfg.Validate(); err != nil {
log.With(nil).Fatal(err)
}
// import debugger tools for pouch when in debug mode.
if cfg.Debug || cfg.EnableProfiler {
if err := agent.Listen(agent.Options{}); err != nil {
log.With(nil).Fatal(err)
}
debug.SetupDumpStackTrap()
}
// resolve home dir.
dir, err := utils.ResolveHomeDir(cfg.HomeDir)
if err != nil {
return err
}
cfg.HomeDir = dir
// saves daemon pid to pidfile.
if cfg.Pidfile != "" {
if err := utils.NewPidfile(cfg.Pidfile); err != nil {
log.With(nil).Errorf("failed to create pidfile: %s", err)
return err
}
defer func() {
if err := os.Remove(cfg.Pidfile); err != nil {
log.With(nil).Errorf("failed to delete pidfile: %s", err)
}
}()
}
// set pouchd oom-score
if err := utils.SetOOMScore(os.Getpid(), cfg.OOMScoreAdjust); err != nil {
log.With(nil).Errorf("failed to set oom-score for pouchd: %v", err)
}
// define and start all required processes.
if cfg.QuotaDriver != "" {
quota.SetQuotaDriver(cfg.QuotaDriver)
}
if err := checkLxcfsCfg(); err != nil {
return err
}
if cfg.MachineMemory, err = system.GetTotalMem(); err != nil {
logrus.Warnf("failed to get system mem: %v", err)
}
// initialize signal and handle method.
var (
errCh = make(chan error, 1)
signalCh = make(chan os.Signal, 1)
)
// new daemon instance, this is core.
d := daemon.NewDaemon(cfg)
if d == nil {
return fmt.Errorf("failed to new daemon")
}
signal.Notify(signalCh, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGHUP)
sigHandles = append(sigHandles, d.Shutdown, d.ShutdownPlugin)
go func() {
// FIXME: I think the Run() should always return error.
errCh <- d.Run()
}()
select {
case sig := <-signalCh:
log.With(nil).Warnf("received signal: %s", sig)
for _, handle := range sigHandles {
if err := handle(); err != nil {
log.With(nil).Errorf("failed to handle signal: %v", err)
}
}
os.Exit(1)
case err := <-errCh:
// FIXME: should we do the cleanup like signal handle?
return err
}
return nil
}
// check lxcfs config
func checkLxcfsCfg() error {
if !cfg.IsLxcfsEnabled {
return nil
}
if !path.IsAbs(cfg.LxcfsHome) {
return fmt.Errorf("invalid lxcfs home dir: %s", cfg.LxcfsHome)
}
cfg.LxcfsHome = strings.TrimSuffix(cfg.LxcfsHome, "/")
lxcfs.IsLxcfsEnabled = cfg.IsLxcfsEnabled
lxcfs.LxcfsHomeDir = cfg.LxcfsHome
lxcfs.LxcfsParentDir = path.Dir(cfg.LxcfsHome)
return lxcfs.CheckLxcfsMount()
}
// load daemon config file
func loadDaemonFile(cfg *config.Config, flagSet *pflag.FlagSet) error {
if cfg.ConfigFile == "" {
return nil
}
return cfg.MergeConfigurations(flagSet)
}