diff --git a/.gitignore b/.gitignore
index 8328ce1..2fe3a1b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ forgejo-runner
 .runner
 coverage.txt
 /gitea-vet
+/config.yaml
 
 # MS VSCode
 .vscode
diff --git a/artifactcache/handler.go b/artifactcache/handler.go
index 7885a9b..86e7aa5 100644
--- a/artifactcache/handler.go
+++ b/artifactcache/handler.go
@@ -18,7 +18,6 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
 	"github.com/go-chi/render"
-	"github.com/nektos/act/pkg/common"
 	log "github.com/sirupsen/logrus"
 	_ "modernc.org/sqlite"
 	"xorm.io/builder"
@@ -39,16 +38,19 @@ type Handler struct {
 
 	gc   atomic.Bool
 	gcAt time.Time
+
+	outboundIP string
 }
 
-func NewHandler() (*Handler, error) {
+func NewHandler(dir, outboundIP string, port uint16) (*Handler, error) {
 	h := &Handler{}
 
-	dir := "" // TODO: make the dir configurable if necessary
-	if home, err := os.UserHomeDir(); err != nil {
-		return nil, err
-	} else {
-		dir = filepath.Join(home, ".cache/actcache")
+	if dir == "" {
+		if home, err := os.UserHomeDir(); err != nil {
+			return nil, err
+		} else {
+			dir = filepath.Join(home, ".cache", "actcache")
+		}
 	}
 	if err := os.MkdirAll(dir, 0o755); err != nil {
 		return nil, err
@@ -69,6 +71,14 @@ func NewHandler() (*Handler, error) {
 	}
 	h.storage = storage
 
+	if outboundIP != "" {
+		h.outboundIP = outboundIP
+	} else if ip, err := getOutboundIP(); err != nil {
+		return nil, err
+	} else {
+		h.outboundIP = ip.String()
+	}
+
 	router := chi.NewRouter()
 	router.Use(middleware.RequestLogger(&middleware.DefaultLogFormatter{Logger: logger}))
 	router.Use(func(handler http.Handler) http.Handler {
@@ -95,8 +105,7 @@ func NewHandler() (*Handler, error) {
 
 	h.gcCache()
 
-	// TODO: make the port configurable if necessary
-	listener, err := net.Listen("tcp", ":0") // random available port
+	listener, err := net.Listen("tcp", fmt.Sprintf(":%d", port)) // listen on all interfaces
 	if err != nil {
 		return nil, err
 	}
@@ -113,7 +122,7 @@ func NewHandler() (*Handler, error) {
 func (h *Handler) ExternalURL() string {
 	// TODO: make the external url configurable if necessary
 	return fmt.Sprintf("http://%s:%d",
-		common.GetOutboundIP().String(),
+		h.outboundIP,
 		h.listener.Addr().(*net.TCPAddr).Port)
 }
 
diff --git a/artifactcache/util.go b/artifactcache/util.go
index 0f22c05..eca173a 100644
--- a/artifactcache/util.go
+++ b/artifactcache/util.go
@@ -5,6 +5,7 @@ package artifactcache
 
 import (
 	"fmt"
+	"net"
 	"net/http"
 	"strconv"
 	"strings"
@@ -44,8 +45,35 @@ func parseContentRange(s string) (int64, int64, error) {
 	return start, stop, nil
 }
 
+func getOutboundIP() (net.IP, error) {
+	// FIXME: It makes more sense to use the gateway IP address of container network
+	if conn, err := net.Dial("udp", "8.8.8.8:80"); err == nil {
+		defer conn.Close()
+		return conn.LocalAddr().(*net.UDPAddr).IP, nil
+	}
+	if ifaces, err := net.Interfaces(); err == nil {
+		for _, i := range ifaces {
+			if addrs, err := i.Addrs(); err == nil {
+				for _, addr := range addrs {
+					var ip net.IP
+					switch v := addr.(type) {
+					case *net.IPNet:
+						ip = v.IP
+					case *net.IPAddr:
+						ip = v.IP
+					}
+					if ip.IsGlobalUnicast() {
+						return ip, nil
+					}
+				}
+			}
+		}
+	}
+	return nil, fmt.Errorf("no outbound IP address found")
+}
+
 // engine is a wrapper of *xorm.Engine, with a lock.
-// To avoid racing of sqlite, we don't careperformance here.
+// To avoid racing of sqlite, we don't care performance here.
 type engine struct {
 	e *xorm.Engine
 	m sync.Mutex
diff --git a/client/header.go b/client/header.go
new file mode 100644
index 0000000..df8627a
--- /dev/null
+++ b/client/header.go
@@ -0,0 +1,10 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package client
+
+const (
+	UUIDHeader    = "x-runner-uuid"
+	TokenHeader   = "x-runner-token"
+	VersionHeader = "x-runner-version"
+)
diff --git a/client/http.go b/client/http.go
index 0aed490..557b4df 100644
--- a/client/http.go
+++ b/client/http.go
@@ -8,7 +8,6 @@ import (
 
 	"code.gitea.io/actions-proto-go/ping/v1/pingv1connect"
 	"code.gitea.io/actions-proto-go/runner/v1/runnerv1connect"
-	"codeberg.org/forgejo/runner/core"
 	"github.com/bufbuild/connect-go"
 )
 
@@ -32,13 +31,13 @@ func New(endpoint string, insecure bool, uuid, token, runnerVersion string, opts
 	opts = append(opts, connect.WithInterceptors(connect.UnaryInterceptorFunc(func(next connect.UnaryFunc) connect.UnaryFunc {
 		return func(ctx context.Context, req connect.AnyRequest) (connect.AnyResponse, error) {
 			if uuid != "" {
-				req.Header().Set(core.UUIDHeader, uuid)
+				req.Header().Set(UUIDHeader, uuid)
 			}
 			if token != "" {
-				req.Header().Set(core.TokenHeader, token)
+				req.Header().Set(TokenHeader, token)
 			}
 			if runnerVersion != "" {
-				req.Header().Set(core.VersionHeader, runnerVersion)
+				req.Header().Set(VersionHeader, runnerVersion)
 			}
 			return next(ctx, req)
 		}
diff --git a/cmd/cmd.go b/cmd/cmd.go
index 3a45f9e..3b82c14 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -1,24 +1,20 @@
+// SPDX-License-Identifier: MIT
 package cmd
 
 import (
 	"context"
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
+
+	"codeberg.org/forgejo/runner/config"
 )
 
 // the version of act_runner
 var version = "develop"
 
-type globalArgs struct {
-	EnvFile string
-}
-
 func Execute(ctx context.Context) {
-	// task := runtime.NewTask("gitea", 0, nil, nil)
-
-	var gArgs globalArgs
-
 	// ./act_runner
 	rootCmd := &cobra.Command{
 		Use:          "act_runner [event name to run]\nIf no event name passed, will default to \"on: push\"",
@@ -26,9 +22,9 @@ func Execute(ctx context.Context) {
 		Args:         cobra.MaximumNArgs(1),
 		Version:      version,
 		SilenceUsage: true,
-		RunE:         runDaemon(ctx, gArgs.EnvFile),
 	}
-	rootCmd.PersistentFlags().StringVarP(&gArgs.EnvFile, "env-file", "", ".env", "Read in a file of environment variables.")
+	configFile := ""
+	rootCmd.PersistentFlags().StringVarP(&configFile, "config", "c", "", "Config file path")
 
 	// ./act_runner register
 	var regArgs registerArgs
@@ -36,11 +32,10 @@ func Execute(ctx context.Context) {
 		Use:   "register",
 		Short: "Register a runner to the server",
 		Args:  cobra.MaximumNArgs(0),
-		RunE:  runRegister(ctx, &regArgs, gArgs.EnvFile), // must use a pointer to regArgs
+		RunE:  runRegister(ctx, &regArgs, &configFile), // must use a pointer to regArgs
 	}
 	registerCmd.Flags().BoolVar(&regArgs.NoInteractive, "no-interactive", false, "Disable interactive mode")
 	registerCmd.Flags().StringVar(&regArgs.InstanceAddr, "instance", "", "Forgejo instance address")
-	registerCmd.Flags().BoolVar(&regArgs.Insecure, "insecure", false, "If check server's certificate if it's https protocol")
 	registerCmd.Flags().StringVar(&regArgs.Token, "token", "", "Runner token")
 	registerCmd.Flags().StringVar(&regArgs.RunnerName, "name", "", "Runner name")
 	registerCmd.Flags().StringVar(&regArgs.Labels, "labels", "", "Runner tags, comma separated")
@@ -51,13 +46,23 @@ func Execute(ctx context.Context) {
 		Use:   "daemon",
 		Short: "Run as a runner daemon",
 		Args:  cobra.MaximumNArgs(1),
-		RunE:  runDaemon(ctx, gArgs.EnvFile),
+		RunE:  runDaemon(ctx, &configFile),
 	}
 	rootCmd.AddCommand(daemonCmd)
 
 	// ./act_runner exec
 	rootCmd.AddCommand(loadExecCmd(ctx))
 
+	// ./act_runner config
+	rootCmd.AddCommand(&cobra.Command{
+		Use:   "generate-config",
+		Short: "Generate an example config file",
+		Args:  cobra.MaximumNArgs(0),
+		Run: func(_ *cobra.Command, _ []string) {
+			fmt.Printf("%s", config.Example)
+		},
+	})
+
 	// hide completion command
 	rootCmd.CompletionOptions.HiddenDefaultCmd = true
 
diff --git a/cmd/daemon.go b/cmd/daemon.go
index fafeb04..188491d 100644
--- a/cmd/daemon.go
+++ b/cmd/daemon.go
@@ -2,8 +2,13 @@ package cmd
 
 import (
 	"context"
+	"fmt"
 	"os"
-	"strings"
+
+	"github.com/mattn/go-isatty"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"golang.org/x/sync/errgroup"
 
 	"codeberg.org/forgejo/runner/artifactcache"
 	"codeberg.org/forgejo/runner/client"
@@ -11,32 +16,32 @@ import (
 	"codeberg.org/forgejo/runner/engine"
 	"codeberg.org/forgejo/runner/poller"
 	"codeberg.org/forgejo/runner/runtime"
-
-	"github.com/joho/godotenv"
-	"github.com/mattn/go-isatty"
-	log "github.com/sirupsen/logrus"
-	"github.com/spf13/cobra"
-	"golang.org/x/sync/errgroup"
 )
 
-func runDaemon(ctx context.Context, envFile string) func(cmd *cobra.Command, args []string) error {
+func runDaemon(ctx context.Context, configFile *string) func(cmd *cobra.Command, args []string) error {
 	return func(cmd *cobra.Command, args []string) error {
 		log.Infoln("Starting runner daemon")
 
-		_ = godotenv.Load(envFile)
-		cfg, err := config.FromEnviron()
+		cfg, err := config.LoadDefault(*configFile)
 		if err != nil {
-			log.WithError(err).
-				Fatalln("invalid configuration")
+			return fmt.Errorf("invalid configuration: %w", err)
 		}
 
 		initLogging(cfg)
 
+		reg, err := config.LoadRegistration(cfg.Runner.File)
+		if os.IsNotExist(err) {
+			log.Error("registration file not found, please register the runner first")
+			return err
+		} else if err != nil {
+			return fmt.Errorf("failed to load registration file: %w", err)
+		}
+
 		// require docker if a runner label uses a docker backend
 		needsDocker := false
-		for _, l := range cfg.Runner.Labels {
-			splits := strings.SplitN(l, ":", 2)
-			if len(splits) == 2 && strings.HasPrefix(splits[1], "docker://") {
+		for _, l := range reg.Labels {
+			_, schema, _, _ := runtime.ParseLabel(l)
+			if schema == "docker" {
 				needsDocker = true
 				break
 			}
@@ -50,43 +55,44 @@ func runDaemon(ctx context.Context, envFile string) func(cmd *cobra.Command, arg
 			}
 		}
 
-		handler, err := artifactcache.NewHandler()
-		if err != nil {
-			return err
-		}
-		log.Infof("cache handler listens on: %v", handler.ExternalURL())
-
 		var g errgroup.Group
 
 		cli := client.New(
-			cfg.Client.Address,
-			cfg.Client.Insecure,
-			cfg.Runner.UUID,
-			cfg.Runner.Token,
+			reg.Address,
+			cfg.Runner.Insecure,
+			reg.UUID,
+			reg.Token,
 			version,
 		)
 
 		runner := &runtime.Runner{
 			Client:        cli,
-			Machine:       cfg.Runner.Name,
-			ForgeInstance: cfg.Client.Address,
-			Environ:       cfg.Runner.Environ,
-			Labels:        cfg.Runner.Labels,
+			Machine:       reg.Name,
+			ForgeInstance: reg.Address,
+			Environ:       cfg.Runner.Envs,
+			Labels:        reg.Labels,
+			Network:       cfg.Container.Network,
 			Version:       version,
-			CacheHandler:  handler,
+		}
+
+		if *cfg.Cache.Enabled {
+			if handler, err := artifactcache.NewHandler(cfg.Cache.Dir, cfg.Cache.Host, cfg.Cache.Port); err != nil {
+				log.Errorf("cannot init cache server, it will be disabled: %v", err)
+			} else {
+				log.Infof("cache handler listens on: %v", handler.ExternalURL())
+				runner.CacheHandler = handler
+			}
 		}
 
 		poller := poller.New(
 			cli,
 			runner.Run,
-			cfg.Runner.Capacity,
+			cfg,
 		)
 
 		g.Go(func() error {
 			l := log.WithField("capacity", cfg.Runner.Capacity).
-				WithField("endpoint", cfg.Client.Address).
-				WithField("os", cfg.Platform.OS).
-				WithField("arch", cfg.Platform.Arch)
+				WithField("endpoint", reg.Address)
 			l.Infoln("polling the remote server")
 
 			if err := poller.Poll(ctx); err != nil {
@@ -106,17 +112,22 @@ func runDaemon(ctx context.Context, envFile string) func(cmd *cobra.Command, arg
 }
 
 // initLogging setup the global logrus logger.
-func initLogging(cfg config.Config) {
+func initLogging(cfg *config.Config) {
 	isTerm := isatty.IsTerminal(os.Stdout.Fd())
 	log.SetFormatter(&log.TextFormatter{
 		DisableColors: !isTerm,
 		FullTimestamp: true,
 	})
 
-	if cfg.Debug {
-		log.SetLevel(log.DebugLevel)
-	}
-	if cfg.Trace {
-		log.SetLevel(log.TraceLevel)
+	if l := cfg.Log.Level; l != "" {
+		level, err := log.ParseLevel(l)
+		if err != nil {
+			log.WithError(err).
+				Errorf("invalid log level: %q", l)
+		}
+		if log.GetLevel() != level {
+			log.Infof("log level changed to %v", level)
+			log.SetLevel(level)
+		}
 	}
 }
diff --git a/cmd/exec.go b/cmd/exec.go
index cd6b3fc..82b365b 100644
--- a/cmd/exec.go
+++ b/cmd/exec.go
@@ -54,6 +54,7 @@ type executeArgs struct {
 	noSkipCheckout        bool
 	debug                 bool
 	dryrun                bool
+	image                 string
 	cacheHandler          *artifactcache.Handler
 }
 
@@ -347,7 +348,7 @@ func runExec(ctx context.Context, execArgs *executeArgs) func(cmd *cobra.Command
 		}
 
 		// init a cache server
-		handler, err := artifactcache.NewHandler()
+		handler, err := artifactcache.NewHandler("", "", 0)
 		if err != nil {
 			return err
 		}
@@ -385,7 +386,7 @@ func runExec(ctx context.Context, execArgs *executeArgs) func(cmd *cobra.Command
 			ContainerNetworkMode:  "bridge",
 			DefaultActionInstance: execArgs.defaultActionsUrl,
 			PlatformPicker: func(_ []string) string {
-				return "node:16-bullseye"
+				return execArgs.image
 			},
 		}
 
@@ -461,6 +462,7 @@ func loadExecCmd(ctx context.Context) *cobra.Command {
 	execCmd.PersistentFlags().BoolVarP(&execArg.noSkipCheckout, "no-skip-checkout", "", false, "Do not skip actions/checkout")
 	execCmd.PersistentFlags().BoolVarP(&execArg.debug, "debug", "d", false, "enable debug log")
 	execCmd.PersistentFlags().BoolVarP(&execArg.dryrun, "dryrun", "n", false, "dryrun mode")
+	execCmd.PersistentFlags().StringVarP(&execArg.image, "image", "i", "node:16-bullseye", "docker image to use")
 
 	return execCmd
 }
diff --git a/cmd/register.go b/cmd/register.go
index 7bd5662..91c84a8 100644
--- a/cmd/register.go
+++ b/cmd/register.go
@@ -1,3 +1,6 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 package cmd
 
 import (
@@ -6,24 +9,25 @@ import (
 	"fmt"
 	"os"
 	"os/signal"
-	"runtime"
+	goruntime "runtime"
 	"strings"
 	"time"
 
 	pingv1 "code.gitea.io/actions-proto-go/ping/v1"
+	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
+
 	"codeberg.org/forgejo/runner/client"
 	"codeberg.org/forgejo/runner/config"
-	"codeberg.org/forgejo/runner/register"
+	"codeberg.org/forgejo/runner/runtime"
 
 	"github.com/bufbuild/connect-go"
-	"github.com/joho/godotenv"
 	"github.com/mattn/go-isatty"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
 
 // runRegister registers a runner to the server
-func runRegister(ctx context.Context, regArgs *registerArgs, envFile string) func(*cobra.Command, []string) error {
+func runRegister(ctx context.Context, regArgs *registerArgs, configFile *string) func(*cobra.Command, []string) error {
 	return func(cmd *cobra.Command, args []string) error {
 		log.SetReportCaller(false)
 		isTerm := isatty.IsTerminal(os.Stdout.Fd())
@@ -34,7 +38,7 @@ func runRegister(ctx context.Context, regArgs *registerArgs, envFile string) fun
 		log.SetLevel(log.DebugLevel)
 
 		log.Infof("Registering runner, arch=%s, os=%s, version=%s.",
-			runtime.GOARCH, runtime.GOOS, version)
+			goruntime.GOARCH, goruntime.GOOS, version)
 
 		// runner always needs root permission
 		if os.Getuid() != 0 {
@@ -43,14 +47,13 @@ func runRegister(ctx context.Context, regArgs *registerArgs, envFile string) fun
 		}
 
 		if regArgs.NoInteractive {
-			if err := registerNoInteractive(envFile, regArgs); err != nil {
+			if err := registerNoInteractive(*configFile, regArgs); err != nil {
 				return err
 			}
 		} else {
 			go func() {
-				if err := registerInteractive(envFile); err != nil {
-					// log.Errorln(err)
-					os.Exit(2)
+				if err := registerInteractive(*configFile); err != nil {
+					log.Fatal(err)
 					return
 				}
 				os.Exit(0)
@@ -69,7 +72,6 @@ func runRegister(ctx context.Context, regArgs *registerArgs, envFile string) fun
 type registerArgs struct {
 	NoInteractive bool
 	InstanceAddr  string
-	Insecure      bool
 	Token         string
 	RunnerName    string
 	Labels        string
@@ -97,7 +99,6 @@ var defaultLabels = []string{
 
 type registerInputs struct {
 	InstanceAddr string
-	Insecure     bool
 	Token        string
 	RunnerName   string
 	CustomLabels []string
@@ -118,12 +119,9 @@ func (r *registerInputs) validate() error {
 
 func validateLabels(labels []string) error {
 	for _, label := range labels {
-		values := strings.SplitN(label, ":", 2)
-		if len(values) > 2 {
-			return fmt.Errorf("Invalid label: %s", label)
+		if _, _, _, err := runtime.ParseLabel(label); err != nil {
+			return err
 		}
-		// len(values) == 1, label for non docker execution environment
-		// TODO: validate value format, like docker://node:16-buster
 	}
 	return nil
 }
@@ -164,7 +162,7 @@ func (r *registerInputs) assignToNext(stage registerStage, value string) registe
 		}
 
 		if validateLabels(r.CustomLabels) != nil {
-			log.Infoln("Invalid labels, please input again, leave blank to use the default labels (for example, ubuntu-20.04:docker://node:16-bullseye,ubuntu-18.04:docker://node:16-buster)")
+			log.Infoln("Invalid labels, please input again, leave blank to use the default labels (for example, ubuntu-20.04:docker://node:16-bullseye,ubuntu-18.04:docker://node:16-buster,linux_arm:host)")
 			return StageInputCustomLabels
 		}
 		return StageWaitingForRegistration
@@ -172,16 +170,17 @@ func (r *registerInputs) assignToNext(stage registerStage, value string) registe
 	return StageUnknown
 }
 
-func registerInteractive(envFile string) error {
+func registerInteractive(configFile string) error {
 	var (
 		reader = bufio.NewReader(os.Stdin)
 		stage  = StageInputInstance
 		inputs = new(registerInputs)
 	)
 
-	// check if overwrite local config
-	_ = godotenv.Load(envFile)
-	cfg, _ := config.FromEnviron()
+	cfg, err := config.LoadDefault(configFile)
+	if err != nil {
+		return fmt.Errorf("failed to load config: %v", err)
+	}
 	if f, err := os.Stat(cfg.Runner.File); err == nil && !f.IsDir() {
 		stage = StageOverwriteLocalConfig
 	}
@@ -197,7 +196,7 @@ func registerInteractive(envFile string) error {
 
 		if stage == StageWaitingForRegistration {
 			log.Infof("Registering runner, name=%s, instance=%s, labels=%v.", inputs.RunnerName, inputs.InstanceAddr, inputs.CustomLabels)
-			if err := doRegister(&cfg, inputs); err != nil {
+			if err := doRegister(cfg, inputs); err != nil {
 				log.Errorf("Failed to register runner: %v", err)
 			} else {
 				log.Infof("Runner registered successfully.")
@@ -221,25 +220,26 @@ func printStageHelp(stage registerStage) {
 	case StageOverwriteLocalConfig:
 		log.Infoln("Runner is already registered, overwrite local config? [y/N]")
 	case StageInputInstance:
-		log.Infoln("Enter the Forgejo instance URL (for example, https://codeberg.org/):")
+		log.Infoln("Enter the Gitea instance URL (for example, https://gitea.com/):")
 	case StageInputToken:
 		log.Infoln("Enter the runner token:")
 	case StageInputRunnerName:
 		hostname, _ := os.Hostname()
-		log.Infof("Enter the runner name (if set empty, use hostname:%s ):\n", hostname)
+		log.Infof("Enter the runner name (if set empty, use hostname: %s):\n", hostname)
 	case StageInputCustomLabels:
-		log.Infoln("Enter the runner labels, leave blank to use the default labels (comma-separated, for example, self-hosted,ubuntu-20.04:docker://node:16-bullseye,ubuntu-18.04:docker://node:16-buster):")
+		log.Infoln("Enter the runner labels, leave blank to use the default labels (comma-separated, for example, ubuntu-20.04:docker://node:16-bullseye,ubuntu-18.04:docker://node:16-buster,linux_arm:host):")
 	case StageWaitingForRegistration:
 		log.Infoln("Waiting for registration...")
 	}
 }
 
-func registerNoInteractive(envFile string, regArgs *registerArgs) error {
-	_ = godotenv.Load(envFile)
-	cfg, _ := config.FromEnviron()
+func registerNoInteractive(configFile string, regArgs *registerArgs) error {
+	cfg, err := config.LoadDefault(configFile)
+	if err != nil {
+		return err
+	}
 	inputs := &registerInputs{
 		InstanceAddr: regArgs.InstanceAddr,
-		Insecure:     regArgs.Insecure,
 		Token:        regArgs.Token,
 		RunnerName:   regArgs.RunnerName,
 		CustomLabels: defaultLabels,
@@ -256,7 +256,7 @@ func registerNoInteractive(envFile string, regArgs *registerArgs) error {
 		log.WithError(err).Errorf("Invalid input, please re-run act command.")
 		return nil
 	}
-	if err := doRegister(&cfg, inputs); err != nil {
+	if err := doRegister(cfg, inputs); err != nil {
 		log.Errorf("Failed to register runner: %v", err)
 		return nil
 	}
@@ -270,7 +270,7 @@ func doRegister(cfg *config.Config, inputs *registerInputs) error {
 	// initial http client
 	cli := client.New(
 		inputs.InstanceAddr,
-		inputs.Insecure,
+		cfg.Runner.Insecure,
 		"",
 		"",
 		version,
@@ -290,18 +290,45 @@ func doRegister(cfg *config.Config, inputs *registerInputs) error {
 		}
 		if err != nil {
 			log.WithError(err).
-				Errorln("Cannot ping the Forgejo instance server")
+				Errorln("Cannot ping the Gitea instance server")
 			// TODO: if ping failed, retry or exit
 			time.Sleep(time.Second)
 		} else {
-			log.Debugln("Successfully pinged the Forgejo instance server")
+			log.Debugln("Successfully pinged the Gitea instance server")
 			break
 		}
 	}
 
-	cfg.Runner.Name = inputs.RunnerName
-	cfg.Runner.Token = inputs.Token
-	cfg.Runner.Labels = inputs.CustomLabels
-	_, err := register.New(cli).Register(ctx, cfg.Runner)
-	return err
+	reg := &config.Registration{
+		Name:    inputs.RunnerName,
+		Token:   inputs.Token,
+		Address: inputs.InstanceAddr,
+		Labels:  inputs.CustomLabels,
+	}
+
+	labels := make([]string, len(reg.Labels))
+	for i, v := range reg.Labels {
+		l, _, _, _ := runtime.ParseLabel(v)
+		labels[i] = l
+	}
+	// register new runner.
+	resp, err := cli.Register(ctx, connect.NewRequest(&runnerv1.RegisterRequest{
+		Name:        reg.Name,
+		Token:       reg.Token,
+		AgentLabels: labels,
+	}))
+	if err != nil {
+		log.WithError(err).Error("poller: cannot register new runner")
+		return err
+	}
+
+	reg.ID = resp.Msg.Runner.Id
+	reg.UUID = resp.Msg.Runner.Uuid
+	reg.Name = resp.Msg.Runner.Name
+	reg.Token = resp.Msg.Runner.Token
+
+	if err := config.SaveRegistration(cfg.Runner.File, reg); err != nil {
+		return fmt.Errorf("failed to save runner config: %w", err)
+	}
+	return nil
 }
diff --git a/cmd/register_test.go b/cmd/register_test.go
deleted file mode 100644
index 0179a97..0000000
--- a/cmd/register_test.go
+++ /dev/null
@@ -1,10 +0,0 @@
-package cmd
-
-import "testing"
-
-func TestValidateLabels(t *testing.T) {
-	labels := []string{"ubuntu-latest:docker://node:16-buster", "self-hosted"}
-	if err := validateLabels(labels); err != nil {
-		t.Errorf("validateLabels() error = %v", err)
-	}
-}
diff --git a/config/config.example.yaml b/config/config.example.yaml
new file mode 100644
index 0000000..1f05f68
--- /dev/null
+++ b/config/config.example.yaml
@@ -0,0 +1,42 @@
+# Example configuration file, it's safe to copy this as the default config file without any modification.
+
+log:
+  # The level of logging, can be trace, debug, info, warn, error, fatal
+  level: info
+
+runner:
+  # Where to store the registration result.
+  file: .runner
+  # Execute how many tasks concurrently at the same time.
+  capacity: 1
+  # Extra environment variables to run jobs.
+  envs:
+    A_TEST_ENV_NAME_1: a_test_env_value_1
+    A_TEST_ENV_NAME_2: a_test_env_value_2
+  # Extra environment variables to run jobs from a file.
+  # It will be ignored if it's empty or the file doesn't exist.
+  env_file: .env
+  # The timeout for a job to be finished.
+  # Please note that the Gitea instance also has a timeout (3h by default) for the job.
+  # So the job could be stopped by the Gitea instance if it's timeout is shorter than this.
+  timeout: 3h
+  # Whether skip verifying the TLS certificate of the Gitea instance.
+  insecure: false
+
+cache:
+  # Enable cache server to use actions/cache.
+  enabled: true
+  # The directory to store the cache data.
+  # If it's empty, the cache data will be stored in $HOME/.cache/actcache.
+  dir: ""
+  # The host of the cache server.
+  # It's not for the address to listen, but the address to connect from job containers.
+  # So 0.0.0.0 is a bad choice, leave it empty to detect automatically.
+  host: ""
+  # The port of the cache server.
+  # 0 means to use a random available port.
+  port: 0
+
+container:
+  # Which network to use for the job containers.
+  network: bridge
diff --git a/config/config.go b/config/config.go
index 6f93c9b..40fef9a 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,117 +1,92 @@
 package config
 
 import (
-	"encoding/json"
-	"io"
+	"fmt"
 	"os"
-	"runtime"
-	"strconv"
-
-	"codeberg.org/forgejo/runner/core"
+	"path/filepath"
+	"time"
 
 	"github.com/joho/godotenv"
-	"github.com/kelseyhightower/envconfig"
+	"gopkg.in/yaml.v3"
 )
 
-type (
-	// Config provides the system configuration.
-	Config struct {
-		Debug    bool `envconfig:"GITEA_DEBUG"`
-		Trace    bool `envconfig:"GITEA_TRACE"`
-		Client   Client
-		Runner   Runner
-		Platform Platform
-	}
-
-	Client struct {
-		Address  string `ignored:"true"`
-		Insecure bool
-	}
-
+type Config struct {
+	Log struct {
+		Level string `yaml:"level"`
+	} `yaml:"log"`
 	Runner struct {
-		UUID     string            `ignored:"true"`
-		Name     string            `envconfig:"GITEA_RUNNER_NAME"`
-		Token    string            `ignored:"true"`
-		Capacity int               `envconfig:"GITEA_RUNNER_CAPACITY" default:"1"`
-		File     string            `envconfig:"FORGEJO_RUNNER_FILE" default:".runner"`
-		Environ  map[string]string `envconfig:"GITEA_RUNNER_ENVIRON"`
-		EnvFile  string            `envconfig:"GITEA_RUNNER_ENV_FILE"`
-		Labels   []string          `envconfig:"GITEA_RUNNER_LABELS"`
+		File     string            `yaml:"file"`
+		Capacity int               `yaml:"capacity"`
+		Envs     map[string]string `yaml:"envs"`
+		EnvFile  string            `yaml:"env_file"`
+		Timeout  time.Duration     `yaml:"timeout"`
+		Insecure bool              `yaml:"insecure"`
+	} `yaml:"runner"`
+	Cache struct {
+		Enabled *bool  `yaml:"enabled"` // pointer to distinguish between false and not set, and it will be true if not set
+		Dir     string `yaml:"dir"`
+		Host    string `yaml:"host"`
+		Port    uint16 `yaml:"port"`
+	} `yaml:"cache"`
+	Container struct {
+		Network string `yaml:"network"`
 	}
+}
 
-	Platform struct {
-		OS   string `envconfig:"GITEA_PLATFORM_OS"`
-		Arch string `envconfig:"GITEA_PLATFORM_ARCH"`
-	}
-)
-
-// FromEnviron returns the settings from the environment.
-func FromEnviron() (Config, error) {
-	cfg := Config{}
-	if err := envconfig.Process("", &cfg); err != nil {
-		return cfg, err
-	}
-
-	// check runner config exist
-	f, err := os.Stat(cfg.Runner.File)
-	if err == nil && !f.IsDir() {
-		jsonFile, _ := os.Open(cfg.Runner.File)
-		defer jsonFile.Close()
-		byteValue, _ := io.ReadAll(jsonFile)
-		var runner core.Runner
-		if err := json.Unmarshal(byteValue, &runner); err != nil {
-			return cfg, err
-		}
-		if runner.UUID != "" {
-			cfg.Runner.UUID = runner.UUID
-		}
-		if runner.Name != "" {
-			cfg.Runner.Name = runner.Name
-		}
-		if runner.Token != "" {
-			cfg.Runner.Token = runner.Token
-		}
-		if len(runner.Labels) != 0 {
-			cfg.Runner.Labels = runner.Labels
-		}
-		if runner.Address != "" {
-			cfg.Client.Address = runner.Address
-		}
-		if runner.Insecure != "" {
-			cfg.Client.Insecure, _ = strconv.ParseBool(runner.Insecure)
-		}
-	} else if err != nil {
-		return cfg, err
-	}
-
-	// runner config
-	if cfg.Runner.Environ == nil {
-		cfg.Runner.Environ = map[string]string{
-			"GITHUB_API_URL":    cfg.Client.Address + "/api/v1",
-			"GITHUB_SERVER_URL": cfg.Client.Address,
-		}
-	}
-	if cfg.Runner.Name == "" {
-		cfg.Runner.Name, _ = os.Hostname()
-	}
-
-	// platform config
-	if cfg.Platform.OS == "" {
-		cfg.Platform.OS = runtime.GOOS
-	}
-	if cfg.Platform.Arch == "" {
-		cfg.Platform.Arch = runtime.GOARCH
-	}
-
-	if file := cfg.Runner.EnvFile; file != "" {
-		envs, err := godotenv.Read(file)
+// LoadDefault returns the default configuration.
+// If file is not empty, it will be used to load the configuration.
+func LoadDefault(file string) (*Config, error) {
+	cfg := &Config{}
+	if file != "" {
+		f, err := os.Open(file)
 		if err != nil {
-			return cfg, err
+			return nil, err
 		}
-		for k, v := range envs {
-			cfg.Runner.Environ[k] = v
+		defer f.Close()
+		decoder := yaml.NewDecoder(f)
+		if err := decoder.Decode(&cfg); err != nil {
+			return nil, err
 		}
 	}
+	compatibleWithOldEnvs(file != "", cfg)
+
+	if cfg.Runner.EnvFile != "" {
+		if stat, err := os.Stat(cfg.Runner.EnvFile); err == nil && !stat.IsDir() {
+			envs, err := godotenv.Read(cfg.Runner.EnvFile)
+			if err != nil {
+				return nil, fmt.Errorf("read env file %q: %w", cfg.Runner.EnvFile, err)
+			}
+			for k, v := range envs {
+				cfg.Runner.Envs[k] = v
+			}
+		}
+	}
+
+	if cfg.Log.Level == "" {
+		cfg.Log.Level = "info"
+	}
+	if cfg.Runner.File == "" {
+		cfg.Runner.File = ".runner"
+	}
+	if cfg.Runner.Capacity <= 0 {
+		cfg.Runner.Capacity = 1
+	}
+	if cfg.Runner.Timeout <= 0 {
+		cfg.Runner.Timeout = 3 * time.Hour
+	}
+	if cfg.Cache.Enabled == nil {
+		b := true
+		cfg.Cache.Enabled = &b
+	}
+	if *cfg.Cache.Enabled {
+		if cfg.Cache.Dir == "" {
+			home, _ := os.UserHomeDir()
+			cfg.Cache.Dir = filepath.Join(home, ".cache", "actcache")
+		}
+	}
+	if cfg.Container.Network == "" {
+		cfg.Container.Network = "bridge"
+	}
 
 	return cfg, nil
 }
diff --git a/config/deprecated.go b/config/deprecated.go
new file mode 100644
index 0000000..b5051aa
--- /dev/null
+++ b/config/deprecated.go
@@ -0,0 +1,62 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// Deprecated: could be removed in the future. TODO: remove it when Gitea 1.20.0 is released.
+// Be compatible with old envs.
+func compatibleWithOldEnvs(fileUsed bool, cfg *Config) {
+	handleEnv := func(key string) (string, bool) {
+		if v, ok := os.LookupEnv(key); ok {
+			if fileUsed {
+				log.Warnf("env %s has been ignored because config file is used", key)
+				return "", false
+			}
+			log.Warnf("env %s will be deprecated, please use config file instead", key)
+			return v, true
+		}
+		return "", false
+	}
+
+	if v, ok := handleEnv("GITEA_DEBUG"); ok {
+		if b, _ := strconv.ParseBool(v); b {
+			cfg.Log.Level = "debug"
+		}
+	}
+	if v, ok := handleEnv("GITEA_TRACE"); ok {
+		if b, _ := strconv.ParseBool(v); b {
+			cfg.Log.Level = "trace"
+		}
+	}
+	if v, ok := handleEnv("GITEA_RUNNER_CAPACITY"); ok {
+		if i, _ := strconv.Atoi(v); i > 0 {
+			cfg.Runner.Capacity = i
+		}
+	}
+	if v, ok := handleEnv("GITEA_RUNNER_FILE"); ok {
+		cfg.Runner.File = v
+	}
+	if v, ok := handleEnv("GITEA_RUNNER_ENVIRON"); ok {
+		splits := strings.Split(v, ",")
+		if cfg.Runner.Envs == nil {
+			cfg.Runner.Envs = map[string]string{}
+		}
+		for _, split := range splits {
+			kv := strings.SplitN(split, ":", 2)
+			if len(kv) == 2 && kv[0] != "" {
+				cfg.Runner.Envs[kv[0]] = kv[1]
+			}
+		}
+	}
+	if v, ok := handleEnv("GITEA_RUNNER_ENV_FILE"); ok {
+		cfg.Runner.EnvFile = v
+	}
+}
diff --git a/config/embed.go b/config/embed.go
new file mode 100644
index 0000000..cf445cf
--- /dev/null
+++ b/config/embed.go
@@ -0,0 +1,9 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package config
+
+import _ "embed"
+
+//go:embed config.example.yaml
+var Example []byte
diff --git a/config/registration.go b/config/registration.go
new file mode 100644
index 0000000..be66b4f
--- /dev/null
+++ b/config/registration.go
@@ -0,0 +1,54 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package config
+
+import (
+	"encoding/json"
+	"os"
+)
+
+const registrationWarning = "This file is automatically generated by act-runner. Do not edit it manually unless you know what you are doing. Removing this file will cause act runner to re-register as a new runner."
+
+// Registration is the registration information for a runner
+type Registration struct {
+	Warning string `json:"WARNING"` // Warning message to display, it's always the registrationWarning constant
+
+	ID      int64    `json:"id"`
+	UUID    string   `json:"uuid"`
+	Name    string   `json:"name"`
+	Token   string   `json:"token"`
+	Address string   `json:"address"`
+	Labels  []string `json:"labels"`
+}
+
+func LoadRegistration(file string) (*Registration, error) {
+	f, err := os.Open(file)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	var reg Registration
+	if err := json.NewDecoder(f).Decode(&reg); err != nil {
+		return nil, err
+	}
+
+	reg.Warning = ""
+
+	return &reg, nil
+}
+
+func SaveRegistration(file string, reg *Registration) error {
+	f, err := os.Create(file)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	reg.Warning = registrationWarning
+
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	return enc.Encode(reg)
+}
diff --git a/core/runner.go b/core/runner.go
deleted file mode 100644
index 2975ca5..0000000
--- a/core/runner.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package core
-
-const (
-	UUIDHeader    = "x-runner-uuid"
-	TokenHeader   = "x-runner-token"
-	VersionHeader = "x-runner-version"
-)
-
-// Runner struct
-type Runner struct {
-	ID       int64    `json:"id"`
-	UUID     string   `json:"uuid"`
-	Name     string   `json:"name"`
-	Token    string   `json:"token"`
-	Address  string   `json:"address"`
-	Insecure string   `json:"insecure"`
-	Labels   []string `json:"labels"`
-}
diff --git a/go.mod b/go.mod
index 2aafba1..92f7b29 100644
--- a/go.mod
+++ b/go.mod
@@ -11,7 +11,6 @@ require (
 	github.com/go-chi/chi/v5 v5.0.8
 	github.com/go-chi/render v1.0.2
 	github.com/joho/godotenv v1.5.1
-	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/mattn/go-isatty v0.0.17
 	github.com/nektos/act v0.0.0
 	github.com/sirupsen/logrus v1.9.0
@@ -19,6 +18,7 @@ require (
 	golang.org/x/sync v0.1.0
 	golang.org/x/term v0.6.0
 	google.golang.org/protobuf v1.28.1
+	gopkg.in/yaml.v3 v3.0.1
 	modernc.org/sqlite v1.14.2
 	xorm.io/builder v0.3.11-0.20220531020008-1bd24a7dc978
 	xorm.io/xorm v1.3.2
@@ -91,7 +91,6 @@ require (
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 	lukechampine.com/uint128 v1.1.1 // indirect
 	modernc.org/cc/v3 v3.35.18 // indirect
 	modernc.org/ccgo/v3 v3.12.82 // indirect
diff --git a/go.sum b/go.sum
index 5436f69..dcf76d8 100644
--- a/go.sum
+++ b/go.sum
@@ -302,8 +302,6 @@ github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4d
 github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNUXsshfwJMBgNA0RU6/i7WVaAegv3PtuIHPMs=
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
-github.com/kelseyhightower/envconfig v1.4.0 h1:Im6hONhd3pLkfDFsbRgu68RDNkGF1r3dvMUtDTo2cv8=
-github.com/kelseyhightower/envconfig v1.4.0/go.mod h1:cccZRl6mQpaq41TPp5QxidR+Sa3axMbJDNb//FQX6Gg=
 github.com/kevinburke/ssh_config v0.0.0-20201106050909-4977a11b4351/go.mod h1:CT57kijsi8u/K/BOFA39wgDQJ9CxiF4nAY/ojJ6r6mM=
 github.com/kevinburke/ssh_config v1.2.0 h1:x584FjTGwHzMwvHx18PXxbBVzfnxogHaAReU4gf13a4=
 github.com/kevinburke/ssh_config v1.2.0/go.mod h1:CT57kijsi8u/K/BOFA39wgDQJ9CxiF4nAY/ojJ6r6mM=
diff --git a/poller/poller.go b/poller/poller.go
index 1600dc4..9825551 100644
--- a/poller/poller.go
+++ b/poller/poller.go
@@ -7,22 +7,23 @@ import (
 	"time"
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
-	"codeberg.org/forgejo/runner/client"
-
 	"github.com/bufbuild/connect-go"
 	log "github.com/sirupsen/logrus"
+
+	"codeberg.org/forgejo/runner/client"
+	"codeberg.org/forgejo/runner/config"
 )
 
 var ErrDataLock = errors.New("Data Lock Error")
 
-func New(cli client.Client, dispatch func(context.Context, *runnerv1.Task) error, workerNum int) *Poller {
+func New(cli client.Client, dispatch func(context.Context, *runnerv1.Task) error, cfg *config.Config) *Poller {
 	return &Poller{
 		Client:       cli,
 		Dispatch:     dispatch,
 		routineGroup: newRoutineGroup(),
 		metric:       &metric{},
-		workerNum:    workerNum,
 		ready:        make(chan struct{}, 1),
+		cfg:          cfg,
 	}
 }
 
@@ -34,13 +35,13 @@ type Poller struct {
 	routineGroup *routineGroup
 	metric       *metric
 	ready        chan struct{}
-	workerNum    int
+	cfg          *config.Config
 }
 
 func (p *Poller) schedule() {
 	p.Lock()
 	defer p.Unlock()
-	if int(p.metric.BusyWorkers()) >= p.workerNum {
+	if int(p.metric.BusyWorkers()) >= p.cfg.Runner.Capacity {
 		return
 	}
 
@@ -54,6 +55,40 @@ func (p *Poller) Wait() {
 	p.routineGroup.Wait()
 }
 
+func (p *Poller) handle(ctx context.Context, l *log.Entry) {
+	defer func() {
+		if r := recover(); r != nil {
+			l.Errorf("handle task panic: %+v", r)
+		}
+	}()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+			task, err := p.pollTask(ctx)
+			if task == nil || err != nil {
+				if err != nil {
+					l.Errorf("can't find the task: %v", err.Error())
+				}
+				time.Sleep(5 * time.Second)
+				break
+			}
+
+			p.metric.IncBusyWorker()
+			p.routineGroup.Run(func() {
+				defer p.schedule()
+				defer p.metric.DecBusyWorker()
+				if err := p.dispatchTask(ctx, task); err != nil {
+					l.Errorf("execute task: %v", err.Error())
+				}
+			})
+			return
+		}
+	}
+}
+
 func (p *Poller) Poll(ctx context.Context) error {
 	l := log.WithField("func", "Poll")
 
@@ -67,32 +102,7 @@ func (p *Poller) Poll(ctx context.Context) error {
 		case <-ctx.Done():
 			return nil
 		}
-	LOOP:
-		for {
-			select {
-			case <-ctx.Done():
-				break LOOP
-			default:
-				task, err := p.pollTask(ctx)
-				if task == nil || err != nil {
-					if err != nil {
-						l.Errorf("can't find the task: %v", err.Error())
-					}
-					time.Sleep(5 * time.Second)
-					break
-				}
-
-				p.metric.IncBusyWorker()
-				p.routineGroup.Run(func() {
-					defer p.schedule()
-					defer p.metric.DecBusyWorker()
-					if err := p.dispatchTask(ctx, task); err != nil {
-						l.Errorf("execute task: %v", err.Error())
-					}
-				})
-				break LOOP
-			}
-		}
+		p.handle(ctx, l)
 	}
 }
 
@@ -139,7 +149,7 @@ func (p *Poller) dispatchTask(ctx context.Context, task *runnerv1.Task) error {
 		}
 	}()
 
-	runCtx, cancel := context.WithTimeout(ctx, time.Hour)
+	runCtx, cancel := context.WithTimeout(ctx, p.cfg.Runner.Timeout)
 	defer cancel()
 
 	return p.Dispatch(runCtx, task)
diff --git a/register/register.go b/register/register.go
deleted file mode 100644
index 4458174..0000000
--- a/register/register.go
+++ /dev/null
@@ -1,63 +0,0 @@
-package register
-
-import (
-	"context"
-	"encoding/json"
-	"os"
-	"strconv"
-	"strings"
-
-	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
-	"codeberg.org/forgejo/runner/client"
-	"codeberg.org/forgejo/runner/config"
-	"codeberg.org/forgejo/runner/core"
-
-	"github.com/bufbuild/connect-go"
-	log "github.com/sirupsen/logrus"
-)
-
-func New(cli client.Client) *Register {
-	return &Register{
-		Client: cli,
-	}
-}
-
-type Register struct {
-	Client client.Client
-}
-
-func (p *Register) Register(ctx context.Context, cfg config.Runner) (*core.Runner, error) {
-	labels := make([]string, len(cfg.Labels))
-	for i, v := range cfg.Labels {
-		labels[i] = strings.SplitN(v, ":", 2)[0]
-	}
-	// register new runner.
-	resp, err := p.Client.Register(ctx, connect.NewRequest(&runnerv1.RegisterRequest{
-		Name:        cfg.Name,
-		Token:       cfg.Token,
-		AgentLabels: labels,
-	}))
-	if err != nil {
-		log.WithError(err).Error("poller: cannot register new runner")
-		return nil, err
-	}
-
-	data := &core.Runner{
-		ID:       resp.Msg.Runner.Id,
-		UUID:     resp.Msg.Runner.Uuid,
-		Name:     resp.Msg.Runner.Name,
-		Token:    resp.Msg.Runner.Token,
-		Address:  p.Client.Address(),
-		Insecure: strconv.FormatBool(p.Client.Insecure()),
-		Labels:   cfg.Labels,
-	}
-
-	file, err := json.MarshalIndent(data, "", "  ")
-	if err != nil {
-		log.WithError(err).Error("poller: cannot marshal the json input")
-		return data, err
-	}
-
-	// store runner config in .runner file
-	return data, os.WriteFile(cfg.File, file, 0o644)
-}
diff --git a/runtime/label.go b/runtime/label.go
new file mode 100644
index 0000000..c7aa001
--- /dev/null
+++ b/runtime/label.go
@@ -0,0 +1,26 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package runtime
+
+import (
+	"fmt"
+	"strings"
+)
+
+func ParseLabel(str string) (label, schema, arg string, err error) {
+	splits := strings.SplitN(str, ":", 3)
+	label = splits[0]
+	schema = "host"
+	arg = ""
+	if len(splits) >= 2 {
+		schema = splits[1]
+	}
+	if len(splits) >= 3 {
+		arg = splits[2]
+	}
+	if schema != "host" && schema != "docker" {
+		return "", "", "", fmt.Errorf("unsupported schema: %s", schema)
+	}
+	return
+}
diff --git a/runtime/label_test.go b/runtime/label_test.go
new file mode 100644
index 0000000..f17c372
--- /dev/null
+++ b/runtime/label_test.go
@@ -0,0 +1,63 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package runtime
+
+import "testing"
+
+func TestParseLabel(t *testing.T) {
+	tests := []struct {
+		args       string
+		wantLabel  string
+		wantSchema string
+		wantArg    string
+		wantErr    bool
+	}{
+		{
+			args:       "ubuntu:docker://node:18",
+			wantLabel:  "ubuntu",
+			wantSchema: "docker",
+			wantArg:    "//node:18",
+			wantErr:    false,
+		},
+		{
+			args:       "ubuntu:host",
+			wantLabel:  "ubuntu",
+			wantSchema: "host",
+			wantArg:    "",
+			wantErr:    false,
+		},
+		{
+			args:       "ubuntu",
+			wantLabel:  "ubuntu",
+			wantSchema: "host",
+			wantArg:    "",
+			wantErr:    false,
+		},
+		{
+			args:       "ubuntu:vm:ubuntu-18.04",
+			wantLabel:  "",
+			wantSchema: "",
+			wantArg:    "",
+			wantErr:    true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.args, func(t *testing.T) {
+			gotLabel, gotSchema, gotArg, err := ParseLabel(tt.args)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("parseLabel() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if gotLabel != tt.wantLabel {
+				t.Errorf("parseLabel() gotLabel = %v, want %v", gotLabel, tt.wantLabel)
+			}
+			if gotSchema != tt.wantSchema {
+				t.Errorf("parseLabel() gotSchema = %v, want %v", gotSchema, tt.wantSchema)
+			}
+			if gotArg != tt.wantArg {
+				t.Errorf("parseLabel() gotArg = %v, want %v", gotArg, tt.wantArg)
+			}
+		})
+	}
+}
diff --git a/runtime/reporter.go b/runtime/reporter.go
index 544852a..51d5e59 100644
--- a/runtime/reporter.go
+++ b/runtime/reporter.go
@@ -99,7 +99,7 @@ func (r *Reporter) Fire(entry *log.Entry) error {
 
 	var step *runnerv1.StepState
 	if v, ok := entry.Data["stepNumber"]; ok {
-		if v, ok := v.(int); ok {
+		if v, ok := v.(int); ok && len(r.state.Steps) > v {
 			step = r.state.Steps[v]
 		}
 	}
diff --git a/runtime/runtime.go b/runtime/runtime.go
index c5a9118..068dd4f 100644
--- a/runtime/runtime.go
+++ b/runtime/runtime.go
@@ -7,6 +7,7 @@ import (
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
 	"codeberg.org/forgejo/runner/artifactcache"
 	"codeberg.org/forgejo/runner/client"
+	log "github.com/sirupsen/logrus"
 )
 
 // Runner runs the pipeline.
@@ -17,6 +18,7 @@ type Runner struct {
 	Environ       map[string]string
 	Client        client.Client
 	Labels        []string
+	Network       string
 	CacheHandler  *artifactcache.Handler
 }
 
@@ -26,33 +28,31 @@ func (s *Runner) Run(ctx context.Context, task *runnerv1.Task) error {
 	for k, v := range s.Environ {
 		env[k] = v
 	}
-	env["ACTIONS_CACHE_URL"] = s.CacheHandler.ExternalURL() + "/"
-	return NewTask(s.ForgeInstance, task.Id, s.Client, env, s.platformPicker).Run(ctx, task, s.Machine, s.Version)
+	if s.CacheHandler != nil {
+		env["ACTIONS_CACHE_URL"] = s.CacheHandler.ExternalURL() + "/"
+	}
+	return NewTask(task.Id, s.Client, env, s.Network, s.platformPicker).Run(ctx, task, s.Machine, s.Version)
 }
 
 func (s *Runner) platformPicker(labels []string) string {
-	// "ubuntu-18.04:docker://node:16-buster"
-	// "self-hosted"
-
-	platforms := make(map[string]string, len(labels))
+	platforms := make(map[string]string, len(s.Labels))
 	for _, l := range s.Labels {
-		// "ubuntu-18.04:docker://node:16-buster"
-		splits := strings.SplitN(l, ":", 2)
-		if len(splits) == 1 {
-			// identifier for non docker execution environment
-			platforms[splits[0]] = "-self-hosted"
+		label, schema, arg, err := ParseLabel(l)
+		if err != nil {
+			log.Errorf("invaid label %q: %v", l, err)
 			continue
 		}
-		// ["ubuntu-18.04", "docker://node:16-buster"]
-		k, v := splits[0], splits[1]
 
-		if prefix := "docker://"; !strings.HasPrefix(v, prefix) {
+		switch schema {
+		case "docker":
+			// TODO "//" will be ignored, maybe we should use 'ubuntu-18.04:docker:node:16-buster' instead
+			platforms[label] = strings.TrimPrefix(arg, "//")
+		case "host":
+			platforms[label] = "-self-hosted"
+		default:
+			// It should not happen, because ParseLabel has checked it.
 			continue
-		} else {
-			v = strings.TrimPrefix(v, prefix)
 		}
-		// ubuntu-18.04 => node:16-buster
-		platforms[k] = v
 	}
 
 	for _, label := range labels {
@@ -67,6 +67,8 @@ func (s *Runner) platformPicker(labels []string) string {
 	//   ["with-gpu"] => "linux:with-gpu"
 	//   ["ubuntu-22.04", "with-gpu"] => "ubuntu:22.04_with-gpu"
 
-	// return default
-	return "node:16-bullseye"
+	// return default.
+	// So the runner receives a task with a label that the runner doesn't have,
+	// it happens when the user have edited the label of the runner in the web UI.
+	return "node:16-bullseye" // TODO: it may be not correct, what if the runner is used as host mode only?
 }
diff --git a/runtime/task.go b/runtime/task.go
index bffe098..ece4ad0 100644
--- a/runtime/task.go
+++ b/runtime/task.go
@@ -71,11 +71,11 @@ type Task struct {
 }
 
 // NewTask creates a new task
-func NewTask(forgeInstance string, buildID int64, client client.Client, runnerEnvs map[string]string, picker func([]string) string) *Task {
+func NewTask(buildID int64, client client.Client, runnerEnvs map[string]string, network string, picker func([]string) string) *Task {
 	task := &Task{
 		Input: &TaskInput{
 			envs:                 runnerEnvs,
-			containerNetworkMode: "bridge", // TODO should be configurable
+			containerNetworkMode: network,
 		},
 		BuildID: buildID,