diff --git a/Dockerfile b/Dockerfile
index b0e304d200..f5f32c4ed3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -49,11 +49,6 @@ RUN apt-get update && apt-get install -y \
 	&& make PREFIX=/build/ install-criu
 
 FROM base AS registry
-# Install two versions of the registry. The first is an older version that
-# only supports schema1 manifests. The second is a newer version that supports
-# both. This allows integration-cli tests to cover push/pull with both schema1
-# and schema2 manifests.
-ENV REGISTRY_COMMIT_SCHEMA1 ec87e9b6971d831f0eff752ddb54fb64693e51cd
 ENV REGISTRY_COMMIT 47a064d4195a9b56133891bbb13620c3ac83a827
 RUN set -x \
 	&& export GOPATH="$(mktemp -d)" \
@@ -61,13 +56,6 @@ RUN set -x \
 	&& (cd "$GOPATH/src/github.com/docker/distribution" && git checkout -q "$REGISTRY_COMMIT") \
 	&& GOPATH="$GOPATH/src/github.com/docker/distribution/Godeps/_workspace:$GOPATH" \
 		go build -buildmode=pie -o /build/registry-v2 github.com/docker/distribution/cmd/registry \
-	&& case $(dpkg --print-architecture) in \
-		amd64|ppc64*|s390x) \
-		(cd "$GOPATH/src/github.com/docker/distribution" && git checkout -q "$REGISTRY_COMMIT_SCHEMA1"); \
-		GOPATH="$GOPATH/src/github.com/docker/distribution/Godeps/_workspace:$GOPATH"; \
-			go build -buildmode=pie -o /build/registry-v2-schema1 github.com/docker/distribution/cmd/registry; \
-		;; \
-	   esac \
 	&& rm -rf "$GOPATH"
 
 
diff --git a/cmd/dockerd/config.go b/cmd/dockerd/config.go
index bf64108ef4..317315414f 100644
--- a/cmd/dockerd/config.go
+++ b/cmd/dockerd/config.go
@@ -12,8 +12,6 @@ import (
 const (
 	// defaultShutdownTimeout is the default shutdown timeout for the daemon
 	defaultShutdownTimeout = 15
-	// defaultTrustKeyFile is the default filename for the trust key
-	defaultTrustKeyFile = "key.json"
 )
 
 // installCommonConfigFlags adds flags to the pflag.FlagSet to configure the daemon
@@ -83,13 +81,6 @@ func installCommonConfigFlags(conf *config.Config, flags *pflag.FlagSet) error {
 
 	flags.IntVar(&conf.NetworkControlPlaneMTU, "network-control-plane-mtu", config.DefaultNetworkMtu, "Network Control plane MTU")
 
-	// "--deprecated-key-path" is to allow configuration of the key used
-	// for the daemon ID and the deprecated image signing. It was never
-	// exposed as a command line option but is added here to allow
-	// overriding the default path in configuration.
-	flags.Var(opts.NewQuotedString(&conf.TrustKeyPath), "deprecated-key-path", "Path to key file for ID and image signing")
-	flags.MarkHidden("deprecated-key-path")
-
 	conf.MaxConcurrentDownloads = &maxConcurrentDownloads
 	conf.MaxConcurrentUploads = &maxConcurrentUploads
 	return nil
@@ -103,10 +94,4 @@ func installRegistryServiceFlags(options *registry.ServiceOptions, flags *pflag.
 	flags.Var(ana, "allow-nondistributable-artifacts", "Allow push of nondistributable artifacts to registry")
 	flags.Var(mirrors, "registry-mirror", "Preferred Docker registry mirror")
 	flags.Var(insecureRegistries, "insecure-registry", "Enable insecure registry communication")
-
-	if runtime.GOOS != "windows" {
-		// TODO: Remove this flag after 3 release cycles (18.03)
-		flags.BoolVar(&options.V2Only, "disable-legacy-registry", true, "Disable contacting legacy registries")
-		flags.MarkHidden("disable-legacy-registry")
-	}
 }
diff --git a/cmd/dockerd/daemon.go b/cmd/dockerd/daemon.go
index 6f99207ca1..cdb0c2ac95 100644
--- a/cmd/dockerd/daemon.go
+++ b/cmd/dockerd/daemon.go
@@ -432,14 +432,6 @@ func loadDaemonCliConfig(opts *daemonOptions) (*config.Config, error) {
 		conf.CommonTLSOptions.KeyFile = opts.TLSOptions.KeyFile
 	}
 
-	if conf.TrustKeyPath == "" {
-		daemonConfDir, err := getDaemonConfDir(conf.Root)
-		if err != nil {
-			return nil, err
-		}
-		conf.TrustKeyPath = filepath.Join(daemonConfDir, defaultTrustKeyFile)
-	}
-
 	if flags.Changed("graph") && flags.Changed("data-root") {
 		return nil, errors.New(`cannot specify both "--graph" and "--data-root" option`)
 	}
@@ -462,17 +454,6 @@ func loadDaemonCliConfig(opts *daemonOptions) (*config.Config, error) {
 		return nil, err
 	}
 
-	if runtime.GOOS != "windows" {
-		if flags.Changed("disable-legacy-registry") {
-			// TODO: Remove this error after 3 release cycles (18.03)
-			return nil, errors.New("ERROR: The '--disable-legacy-registry' flag has been removed. Interacting with legacy (v1) registries is no longer supported")
-		}
-		if !conf.V2Only {
-			// TODO: Remove this error after 3 release cycles (18.03)
-			return nil, errors.New("ERROR: The 'disable-legacy-registry' configuration option has been removed. Interacting with legacy (v1) registries is no longer supported")
-		}
-	}
-
 	if flags.Changed("graph") {
 		logrus.Warnf(`The "-g / --graph" flag is deprecated. Please use "--data-root" instead`)
 	}
diff --git a/cmd/dockerd/daemon_unix.go b/cmd/dockerd/daemon_unix.go
index f6ada580aa..5626477e74 100644
--- a/cmd/dockerd/daemon_unix.go
+++ b/cmd/dockerd/daemon_unix.go
@@ -55,10 +55,6 @@ func setDefaultUmask() error {
 	return nil
 }
 
-func getDaemonConfDir(_ string) (string, error) {
-	return getDefaultDaemonConfigDir()
-}
-
 func (cli *DaemonCli) getPlatformContainerdDaemonOpts() ([]supervisor.DaemonOpt, error) {
 	opts := []supervisor.DaemonOpt{
 		supervisor.WithOOMScore(cli.Config.OOMScoreAdjust),
diff --git a/cmd/dockerd/daemon_windows.go b/cmd/dockerd/daemon_windows.go
index f4d213da96..7cd96c356e 100644
--- a/cmd/dockerd/daemon_windows.go
+++ b/cmd/dockerd/daemon_windows.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"net"
 	"os"
-	"path/filepath"
 
 	"github.com/docker/docker/daemon/config"
 	"github.com/docker/docker/libcontainerd/supervisor"
@@ -21,10 +20,6 @@ func setDefaultUmask() error {
 	return nil
 }
 
-func getDaemonConfDir(root string) (string, error) {
-	return filepath.Join(root, `\config`), nil
-}
-
 // preNotifySystem sends a message to the host when the API is active, but before the daemon is
 func preNotifySystem() {
 	// start the service now to prevent timeouts waiting for daemon to start
diff --git a/daemon/config/config.go b/daemon/config/config.go
index 1b1dc9ca16..75430ed4b8 100644
--- a/daemon/config/config.go
+++ b/daemon/config/config.go
@@ -8,7 +8,6 @@ import (
 	"io/ioutil"
 	"os"
 	"reflect"
-	"runtime"
 	"strings"
 	"sync"
 
@@ -135,12 +134,6 @@ type CommonConfig struct {
 	SocketGroup           string                    `json:"group,omitempty"`
 	CorsHeaders           string                    `json:"api-cors-header,omitempty"`
 
-	// TrustKeyPath is used to generate the daemon ID and for signing schema 1 manifests
-	// when pushing to a registry which does not support schema 2. This field is marked as
-	// deprecated because schema 1 manifests are deprecated in favor of schema 2 and the
-	// daemon ID will use a dedicated identifier not shared with exported signatures.
-	TrustKeyPath string `json:"deprecated-key-path,omitempty"`
-
 	// LiveRestoreEnabled determines whether we should keep containers
 	// alive upon daemon shutdown/start
 	LiveRestoreEnabled bool `json:"live-restore,omitempty"`
@@ -247,9 +240,6 @@ func New() *Config {
 	config.LogConfig.Config = make(map[string]string)
 	config.ClusterOpts = make(map[string]string)
 
-	if runtime.GOOS != "linux" {
-		config.V2Only = true
-	}
 	return &config
 }
 
diff --git a/daemon/daemon.go b/daemon/daemon.go
index d0e2f8578e..a41c2a8e4d 100644
--- a/daemon/daemon.go
+++ b/daemon/daemon.go
@@ -953,7 +953,7 @@ func NewDaemon(ctx context.Context, config *config.Config, pluginStore *plugin.S
 		return nil, err
 	}
 
-	trustKey, err := loadOrCreateTrustKey(config.TrustKeyPath)
+	uuid, err := loadOrCreateUUID(filepath.Join(config.Root, "engine_uuid"))
 	if err != nil {
 		return nil, err
 	}
@@ -998,7 +998,7 @@ func NewDaemon(ctx context.Context, config *config.Config, pluginStore *plugin.S
 		return nil, errors.New("Devices cgroup isn't mounted")
 	}
 
-	d.ID = trustKey.PublicKey().KeyID()
+	d.ID = uuid
 	d.repository = daemonRepo
 	d.containers = container.NewMemoryStore()
 	if d.containersReplica, err = container.NewViewDB(); err != nil {
@@ -1029,7 +1029,6 @@ func NewDaemon(ctx context.Context, config *config.Config, pluginStore *plugin.S
 		MaxConcurrentUploads:      *config.MaxConcurrentUploads,
 		ReferenceStore:            rs,
 		RegistryService:           registryService,
-		TrustKey:                  trustKey,
 	})
 
 	go d.execCommandGC()
diff --git a/daemon/images/image_push.go b/daemon/images/image_push.go
index 4c7be8d2e9..c397b1cd52 100644
--- a/daemon/images/image_push.go
+++ b/daemon/images/image_push.go
@@ -54,7 +54,6 @@ func (i *ImageService) PushImage(ctx context.Context, image, tag string, metaHea
 		},
 		ConfigMediaType: schema2.MediaTypeImageConfig,
 		LayerStores:     distribution.NewLayerProvidersFromStores(i.layerStores),
-		TrustKey:        i.trustKey,
 		UploadManager:   i.uploadManager,
 	}
 
diff --git a/daemon/images/service.go b/daemon/images/service.go
index e8df5cb649..9034e5f37c 100644
--- a/daemon/images/service.go
+++ b/daemon/images/service.go
@@ -14,7 +14,6 @@ import (
 	"github.com/docker/docker/layer"
 	dockerreference "github.com/docker/docker/reference"
 	"github.com/docker/docker/registry"
-	"github.com/docker/libtrust"
 	"github.com/opencontainers/go-digest"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -40,7 +39,6 @@ type ImageServiceConfig struct {
 	MaxConcurrentUploads      int
 	ReferenceStore            dockerreference.Store
 	RegistryService           registry.Service
-	TrustKey                  libtrust.PrivateKey
 }
 
 // NewImageService returns a new ImageService from a configuration
@@ -56,7 +54,6 @@ func NewImageService(config ImageServiceConfig) *ImageService {
 		layerStores:               config.LayerStores,
 		referenceStore:            config.ReferenceStore,
 		registryService:           config.RegistryService,
-		trustKey:                  config.TrustKey,
 		uploadManager:             xfer.NewLayerUploadManager(config.MaxConcurrentUploads),
 	}
 }
@@ -72,7 +69,6 @@ type ImageService struct {
 	pruneRunning              int32
 	referenceStore            dockerreference.Store
 	registryService           registry.Service
-	trustKey                  libtrust.PrivateKey
 	uploadManager             *xfer.LayerUploadManager
 }
 
diff --git a/daemon/trustkey.go b/daemon/trustkey.go
deleted file mode 100644
index 4d72c932f1..0000000000
--- a/daemon/trustkey.go
+++ /dev/null
@@ -1,57 +0,0 @@
-package daemon // import "github.com/docker/docker/daemon"
-
-import (
-	"encoding/json"
-	"encoding/pem"
-	"fmt"
-	"os"
-	"path/filepath"
-
-	"github.com/docker/docker/pkg/ioutils"
-	"github.com/docker/docker/pkg/system"
-	"github.com/docker/libtrust"
-)
-
-// LoadOrCreateTrustKey attempts to load the libtrust key at the given path,
-// otherwise generates a new one
-// TODO: this should use more of libtrust.LoadOrCreateTrustKey which may need
-// a refactor or this function to be moved into libtrust
-func loadOrCreateTrustKey(trustKeyPath string) (libtrust.PrivateKey, error) {
-	err := system.MkdirAll(filepath.Dir(trustKeyPath), 0755, "")
-	if err != nil {
-		return nil, err
-	}
-	trustKey, err := libtrust.LoadKeyFile(trustKeyPath)
-	if err == libtrust.ErrKeyFileDoesNotExist {
-		trustKey, err = libtrust.GenerateECP256PrivateKey()
-		if err != nil {
-			return nil, fmt.Errorf("Error generating key: %s", err)
-		}
-		encodedKey, err := serializePrivateKey(trustKey, filepath.Ext(trustKeyPath))
-		if err != nil {
-			return nil, fmt.Errorf("Error serializing key: %s", err)
-		}
-		if err := ioutils.AtomicWriteFile(trustKeyPath, encodedKey, os.FileMode(0600)); err != nil {
-			return nil, fmt.Errorf("Error saving key file: %s", err)
-		}
-	} else if err != nil {
-		return nil, fmt.Errorf("Error loading key file %s: %s", trustKeyPath, err)
-	}
-	return trustKey, nil
-}
-
-func serializePrivateKey(key libtrust.PrivateKey, ext string) (encoded []byte, err error) {
-	if ext == ".json" || ext == ".jwk" {
-		encoded, err = json.Marshal(key)
-		if err != nil {
-			return nil, fmt.Errorf("unable to encode private key JWK: %s", err)
-		}
-	} else {
-		pemBlock, err := key.PEMBlock()
-		if err != nil {
-			return nil, fmt.Errorf("unable to encode private key PEM: %s", err)
-		}
-		encoded = pem.EncodeToMemory(pemBlock)
-	}
-	return
-}
diff --git a/daemon/trustkey_test.go b/daemon/trustkey_test.go
deleted file mode 100644
index e49e76aa3e..0000000000
--- a/daemon/trustkey_test.go
+++ /dev/null
@@ -1,71 +0,0 @@
-package daemon // import "github.com/docker/docker/daemon"
-
-import (
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"testing"
-
-	"gotest.tools/assert"
-	is "gotest.tools/assert/cmp"
-	"gotest.tools/fs"
-)
-
-// LoadOrCreateTrustKey
-func TestLoadOrCreateTrustKeyInvalidKeyFile(t *testing.T) {
-	tmpKeyFolderPath, err := ioutil.TempDir("", "api-trustkey-test")
-	assert.NilError(t, err)
-	defer os.RemoveAll(tmpKeyFolderPath)
-
-	tmpKeyFile, err := ioutil.TempFile(tmpKeyFolderPath, "keyfile")
-	assert.NilError(t, err)
-
-	_, err = loadOrCreateTrustKey(tmpKeyFile.Name())
-	assert.Check(t, is.ErrorContains(err, "Error loading key file"))
-}
-
-func TestLoadOrCreateTrustKeyCreateKeyWhenFileDoesNotExist(t *testing.T) {
-	tmpKeyFolderPath := fs.NewDir(t, "api-trustkey-test")
-	defer tmpKeyFolderPath.Remove()
-
-	// Without the need to create the folder hierarchy
-	tmpKeyFile := tmpKeyFolderPath.Join("keyfile")
-
-	key, err := loadOrCreateTrustKey(tmpKeyFile)
-	assert.NilError(t, err)
-	assert.Check(t, key != nil)
-
-	_, err = os.Stat(tmpKeyFile)
-	assert.NilError(t, err, "key file doesn't exist")
-}
-
-func TestLoadOrCreateTrustKeyCreateKeyWhenDirectoryDoesNotExist(t *testing.T) {
-	tmpKeyFolderPath := fs.NewDir(t, "api-trustkey-test")
-	defer tmpKeyFolderPath.Remove()
-	tmpKeyFile := tmpKeyFolderPath.Join("folder/hierarchy/keyfile")
-
-	key, err := loadOrCreateTrustKey(tmpKeyFile)
-	assert.NilError(t, err)
-	assert.Check(t, key != nil)
-
-	_, err = os.Stat(tmpKeyFile)
-	assert.NilError(t, err, "key file doesn't exist")
-}
-
-func TestLoadOrCreateTrustKeyCreateKeyNoPath(t *testing.T) {
-	defer os.Remove("keyfile")
-	key, err := loadOrCreateTrustKey("keyfile")
-	assert.NilError(t, err)
-	assert.Check(t, key != nil)
-
-	_, err = os.Stat("keyfile")
-	assert.NilError(t, err, "key file doesn't exist")
-}
-
-func TestLoadOrCreateTrustKeyLoadValidKey(t *testing.T) {
-	tmpKeyFile := filepath.Join("testdata", "keyfile")
-	key, err := loadOrCreateTrustKey(tmpKeyFile)
-	assert.NilError(t, err)
-	expected := "AWX2:I27X:WQFX:IOMK:CNAK:O7PW:VYNB:ZLKC:CVAE:YJP2:SI4A:XXAY"
-	assert.Check(t, is.Contains(key.String(), expected))
-}
diff --git a/daemon/uuid.go b/daemon/uuid.go
new file mode 100644
index 0000000000..fc68981095
--- /dev/null
+++ b/daemon/uuid.go
@@ -0,0 +1,28 @@
+package daemon // import "github.com/docker/docker/daemon"
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/docker/docker/pkg/ioutils"
+	"github.com/pborman/uuid"
+)
+
+func loadOrCreateUUID(path string) (string, error) {
+	err := os.MkdirAll(filepath.Dir(path), 0755)
+	if err != nil {
+		return "", err
+	}
+	id, err := ioutil.ReadFile(path)
+	if os.IsNotExist(err) {
+		id = []byte(uuid.New())
+		if err := ioutils.AtomicWriteFile(path, id, os.FileMode(0600)); err != nil {
+			return "", fmt.Errorf("Error saving uuid file: %s", err)
+		}
+	} else if err != nil {
+		return "", fmt.Errorf("Error loading uuid file %s: %s", path, err)
+	}
+	return string(id), nil
+}
diff --git a/distribution/config.go b/distribution/config.go
index 438051c296..e9631d1b8c 100644
--- a/distribution/config.go
+++ b/distribution/config.go
@@ -18,7 +18,6 @@ import (
 	"github.com/docker/docker/pkg/system"
 	refstore "github.com/docker/docker/reference"
 	"github.com/docker/docker/registry"
-	"github.com/docker/libtrust"
 	"github.com/opencontainers/go-digest"
 	specs "github.com/opencontainers/image-spec/specs-go/v1"
 )
@@ -73,9 +72,6 @@ type ImagePushConfig struct {
 	ConfigMediaType string
 	// LayerStores (indexed by operating system) manages layers.
 	LayerStores map[string]PushLayerProvider
-	// TrustKey is the private key for legacy signatures. This is typically
-	// an ephemeral key, since these signatures are no longer verified.
-	TrustKey libtrust.PrivateKey
 	// UploadManager dispatches uploads.
 	UploadManager *xfer.LayerUploadManager
 }
diff --git a/distribution/push_v2.go b/distribution/push_v2.go
index 9dc3e7a2a6..5281677734 100644
--- a/distribution/push_v2.go
+++ b/distribution/push_v2.go
@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"runtime"
 	"sort"
 	"strings"
 	"sync"
@@ -181,26 +180,8 @@ func (p *v2Pusher) pushV2Tag(ctx context.Context, ref reference.NamedTagged, id
 
 	putOptions := []distribution.ManifestServiceOption{distribution.WithTag(ref.Tag())}
 	if _, err = manSvc.Put(ctx, manifest, putOptions...); err != nil {
-		if runtime.GOOS == "windows" || p.config.TrustKey == nil || p.config.RequireSchema2 {
-			logrus.Warnf("failed to upload schema2 manifest: %v", err)
-			return err
-		}
-
-		logrus.Warnf("failed to upload schema2 manifest: %v - falling back to schema1", err)
-
-		manifestRef, err := reference.WithTag(p.repo.Named(), ref.Tag())
-		if err != nil {
-			return err
-		}
-		builder = schema1.NewConfigManifestBuilder(p.repo.Blobs(ctx), p.config.TrustKey, manifestRef, imgConfig)
-		manifest, err = manifestFromBuilder(ctx, builder, descriptors)
-		if err != nil {
-			return err
-		}
-
-		if _, err = manSvc.Put(ctx, manifest, putOptions...); err != nil {
-			return err
-		}
+		logrus.Warnf("failed to upload schema2 manifest: %v", err)
+		return err
 	}
 
 	var canonicalManifest []byte
diff --git a/integration-cli/check_test.go b/integration-cli/check_test.go
index 0abf18154a..21945a331d 100644
--- a/integration-cli/check_test.go
+++ b/integration-cli/check_test.go
@@ -141,39 +141,6 @@ func (s *DockerRegistrySuite) TearDownTest(c *check.C) {
 	s.ds.TearDownTest(c)
 }
 
-func init() {
-	check.Suite(&DockerSchema1RegistrySuite{
-		ds: &DockerSuite{},
-	})
-}
-
-type DockerSchema1RegistrySuite struct {
-	ds  *DockerSuite
-	reg *registry.V2
-	d   *daemon.Daemon
-}
-
-func (s *DockerSchema1RegistrySuite) OnTimeout(c *check.C) {
-	s.d.DumpStackAndQuit()
-}
-
-func (s *DockerSchema1RegistrySuite) SetUpTest(c *check.C) {
-	testRequires(c, DaemonIsLinux, RegistryHosting, NotArm64, testEnv.IsLocalDaemon)
-	s.reg = registry.NewV2(c, registry.Schema1)
-	s.reg.WaitReady(c)
-	s.d = daemon.New(c, dockerBinary, dockerdBinary, testdaemon.WithEnvironment(testEnv.Execution))
-}
-
-func (s *DockerSchema1RegistrySuite) TearDownTest(c *check.C) {
-	if s.reg != nil {
-		s.reg.Close()
-	}
-	if s.d != nil {
-		s.d.Stop(c)
-	}
-	s.ds.TearDownTest(c)
-}
-
 func init() {
 	check.Suite(&DockerRegistryAuthHtpasswdSuite{
 		ds: &DockerSuite{},
diff --git a/integration-cli/docker_cli_by_digest_test.go b/integration-cli/docker_cli_by_digest_test.go
index 006cf11e1a..8db9f871bd 100644
--- a/integration-cli/docker_cli_by_digest_test.go
+++ b/integration-cli/docker_cli_by_digest_test.go
@@ -3,12 +3,9 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"os"
-	"path/filepath"
 	"regexp"
 	"strings"
 
-	"github.com/docker/distribution/manifest/schema1"
 	"github.com/docker/distribution/manifest/schema2"
 	"github.com/docker/docker/api/types"
 	"github.com/docker/docker/integration-cli/checker"
@@ -80,10 +77,6 @@ func (s *DockerRegistrySuite) TestPullByTagDisplaysDigest(c *check.C) {
 	testPullByTagDisplaysDigest(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPullByTagDisplaysDigest(c *check.C) {
-	testPullByTagDisplaysDigest(c)
-}
-
 func testPullByDigest(c *check.C) {
 	testRequires(c, DaemonIsLinux)
 	pushDigest, err := setupImage(c)
@@ -106,10 +99,6 @@ func (s *DockerRegistrySuite) TestPullByDigest(c *check.C) {
 	testPullByDigest(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPullByDigest(c *check.C) {
-	testPullByDigest(c)
-}
-
 func testPullByDigestNoFallback(c *check.C) {
 	testRequires(c, DaemonIsLinux)
 	// pull from the registry using the <name>@<digest> reference
@@ -123,10 +112,6 @@ func (s *DockerRegistrySuite) TestPullByDigestNoFallback(c *check.C) {
 	testPullByDigestNoFallback(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPullByDigestNoFallback(c *check.C) {
-	testPullByDigestNoFallback(c)
-}
-
 func (s *DockerRegistrySuite) TestCreateByDigest(c *check.C) {
 	pushDigest, err := setupImage(c)
 	c.Assert(err, checker.IsNil, check.Commentf("error setting up image"))
@@ -563,131 +548,3 @@ func (s *DockerRegistrySuite) TestPullFailsWithAlteredManifest(c *check.C) {
 	expectedErrorMsg := fmt.Sprintf("manifest verification failed for digest %s", manifestDigest)
 	c.Assert(out, checker.Contains, expectedErrorMsg)
 }
-
-// TestPullFailsWithAlteredManifest tests that a `docker pull` fails when
-// we have modified a manifest blob and its digest cannot be verified.
-// This is the schema1 version of the test.
-func (s *DockerSchema1RegistrySuite) TestPullFailsWithAlteredManifest(c *check.C) {
-	testRequires(c, DaemonIsLinux)
-	manifestDigest, err := setupImage(c)
-	c.Assert(err, checker.IsNil, check.Commentf("error setting up image"))
-
-	// Load the target manifest blob.
-	manifestBlob := s.reg.ReadBlobContents(c, manifestDigest)
-
-	var imgManifest schema1.Manifest
-	err = json.Unmarshal(manifestBlob, &imgManifest)
-	c.Assert(err, checker.IsNil, check.Commentf("unable to decode image manifest from blob"))
-
-	// Change a layer in the manifest.
-	imgManifest.FSLayers[0] = schema1.FSLayer{
-		BlobSum: digest.Digest("sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"),
-	}
-
-	// Move the existing data file aside, so that we can replace it with a
-	// malicious blob of data. NOTE: we defer the returned undo func.
-	undo := s.reg.TempMoveBlobData(c, manifestDigest)
-	defer undo()
-
-	alteredManifestBlob, err := json.MarshalIndent(imgManifest, "", "   ")
-	c.Assert(err, checker.IsNil, check.Commentf("unable to encode altered image manifest to JSON"))
-
-	s.reg.WriteBlobContents(c, manifestDigest, alteredManifestBlob)
-
-	// Now try pulling that image by digest. We should get an error about
-	// digest verification for the manifest digest.
-
-	// Pull from the registry using the <name>@<digest> reference.
-	imageReference := fmt.Sprintf("%s@%s", repoName, manifestDigest)
-	out, exitStatus, _ := dockerCmdWithError("pull", imageReference)
-	c.Assert(exitStatus, checker.Not(check.Equals), 0)
-
-	expectedErrorMsg := fmt.Sprintf("image verification failed for digest %s", manifestDigest)
-	c.Assert(out, checker.Contains, expectedErrorMsg)
-}
-
-// TestPullFailsWithAlteredLayer tests that a `docker pull` fails when
-// we have modified a layer blob and its digest cannot be verified.
-// This is the schema2 version of the test.
-func (s *DockerRegistrySuite) TestPullFailsWithAlteredLayer(c *check.C) {
-	testRequires(c, DaemonIsLinux)
-	manifestDigest, err := setupImage(c)
-	c.Assert(err, checker.IsNil)
-
-	// Load the target manifest blob.
-	manifestBlob := s.reg.ReadBlobContents(c, manifestDigest)
-
-	var imgManifest schema2.Manifest
-	err = json.Unmarshal(manifestBlob, &imgManifest)
-	c.Assert(err, checker.IsNil)
-
-	// Next, get the digest of one of the layers from the manifest.
-	targetLayerDigest := imgManifest.Layers[0].Digest
-
-	// Move the existing data file aside, so that we can replace it with a
-	// malicious blob of data. NOTE: we defer the returned undo func.
-	undo := s.reg.TempMoveBlobData(c, targetLayerDigest)
-	defer undo()
-
-	// Now make a fake data blob in this directory.
-	s.reg.WriteBlobContents(c, targetLayerDigest, []byte("This is not the data you are looking for."))
-
-	// Now try pulling that image by digest. We should get an error about
-	// digest verification for the target layer digest.
-
-	// Remove distribution cache to force a re-pull of the blobs
-	if err := os.RemoveAll(filepath.Join(testEnv.DaemonInfo.DockerRootDir, "image", s.d.StorageDriver(), "distribution")); err != nil {
-		c.Fatalf("error clearing distribution cache: %v", err)
-	}
-
-	// Pull from the registry using the <name>@<digest> reference.
-	imageReference := fmt.Sprintf("%s@%s", repoName, manifestDigest)
-	out, exitStatus, _ := dockerCmdWithError("pull", imageReference)
-	c.Assert(exitStatus, checker.Not(check.Equals), 0, check.Commentf("expected a non-zero exit status"))
-
-	expectedErrorMsg := fmt.Sprintf("filesystem layer verification failed for digest %s", targetLayerDigest)
-	c.Assert(out, checker.Contains, expectedErrorMsg, check.Commentf("expected error message in output: %s", out))
-}
-
-// TestPullFailsWithAlteredLayer tests that a `docker pull` fails when
-// we have modified a layer blob and its digest cannot be verified.
-// This is the schema1 version of the test.
-func (s *DockerSchema1RegistrySuite) TestPullFailsWithAlteredLayer(c *check.C) {
-	testRequires(c, DaemonIsLinux)
-	manifestDigest, err := setupImage(c)
-	c.Assert(err, checker.IsNil)
-
-	// Load the target manifest blob.
-	manifestBlob := s.reg.ReadBlobContents(c, manifestDigest)
-
-	var imgManifest schema1.Manifest
-	err = json.Unmarshal(manifestBlob, &imgManifest)
-	c.Assert(err, checker.IsNil)
-
-	// Next, get the digest of one of the layers from the manifest.
-	targetLayerDigest := imgManifest.FSLayers[0].BlobSum
-
-	// Move the existing data file aside, so that we can replace it with a
-	// malicious blob of data. NOTE: we defer the returned undo func.
-	undo := s.reg.TempMoveBlobData(c, targetLayerDigest)
-	defer undo()
-
-	// Now make a fake data blob in this directory.
-	s.reg.WriteBlobContents(c, targetLayerDigest, []byte("This is not the data you are looking for."))
-
-	// Now try pulling that image by digest. We should get an error about
-	// digest verification for the target layer digest.
-
-	// Remove distribution cache to force a re-pull of the blobs
-	if err := os.RemoveAll(filepath.Join(testEnv.DaemonInfo.DockerRootDir, "image", s.d.StorageDriver(), "distribution")); err != nil {
-		c.Fatalf("error clearing distribution cache: %v", err)
-	}
-
-	// Pull from the registry using the <name>@<digest> reference.
-	imageReference := fmt.Sprintf("%s@%s", repoName, manifestDigest)
-	out, exitStatus, _ := dockerCmdWithError("pull", imageReference)
-	c.Assert(exitStatus, checker.Not(check.Equals), 0, check.Commentf("expected a non-zero exit status"))
-
-	expectedErrorMsg := fmt.Sprintf("filesystem layer verification failed for digest %s", targetLayerDigest)
-	c.Assert(out, checker.Contains, expectedErrorMsg, check.Commentf("expected error message in output: %s", out))
-}
diff --git a/integration-cli/docker_cli_daemon_test.go b/integration-cli/docker_cli_daemon_test.go
index c9f79aa3ad..a3d38b1c09 100644
--- a/integration-cli/docker_cli_daemon_test.go
+++ b/integration-cli/docker_cli_daemon_test.go
@@ -35,7 +35,6 @@ import (
 	"github.com/docker/docker/pkg/mount"
 	"github.com/docker/go-units"
 	"github.com/docker/libnetwork/iptables"
-	"github.com/docker/libtrust"
 	"github.com/go-check/check"
 	"github.com/kr/pty"
 	"golang.org/x/sys/unix"
@@ -551,23 +550,6 @@ func (s *DockerDaemonSuite) TestDaemonAllocatesListeningPort(c *check.C) {
 	}
 }
 
-func (s *DockerDaemonSuite) TestDaemonKeyGeneration(c *check.C) {
-	// TODO: skip or update for Windows daemon
-	os.Remove("/etc/docker/key.json")
-	s.d.Start(c)
-	s.d.Stop(c)
-
-	k, err := libtrust.LoadKeyFile("/etc/docker/key.json")
-	if err != nil {
-		c.Fatalf("Error opening key file")
-	}
-	kid := k.KeyID()
-	// Test Key ID is a valid fingerprint (e.g. QQXN:JY5W:TBXI:MK3X:GX6P:PD5D:F56N:NHCS:LVRZ:JA46:R24J:XEFF)
-	if len(kid) != 59 {
-		c.Fatalf("Bad key ID: %s", kid)
-	}
-}
-
 // GH#11320 - verify that the daemon exits on failure properly
 // Note that this explicitly tests the conflict of {-b,--bridge} and {--bip} options as the means
 // to get a daemon init failure; no other tests for -b/--bip conflict are therefore required
@@ -1195,59 +1177,6 @@ func (s *DockerDaemonSuite) TestDaemonUnixSockCleanedUp(c *check.C) {
 	}
 }
 
-func (s *DockerDaemonSuite) TestDaemonWithWrongkey(c *check.C) {
-	type Config struct {
-		Crv string `json:"crv"`
-		D   string `json:"d"`
-		Kid string `json:"kid"`
-		Kty string `json:"kty"`
-		X   string `json:"x"`
-		Y   string `json:"y"`
-	}
-
-	os.Remove("/etc/docker/key.json")
-	s.d.Start(c)
-	s.d.Stop(c)
-
-	config := &Config{}
-	bytes, err := ioutil.ReadFile("/etc/docker/key.json")
-	if err != nil {
-		c.Fatalf("Error reading key.json file: %s", err)
-	}
-
-	// byte[] to Data-Struct
-	if err := json.Unmarshal(bytes, &config); err != nil {
-		c.Fatalf("Error Unmarshal: %s", err)
-	}
-
-	//replace config.Kid with the fake value
-	config.Kid = "VSAJ:FUYR:X3H2:B2VZ:KZ6U:CJD5:K7BX:ZXHY:UZXT:P4FT:MJWG:HRJ4"
-
-	// NEW Data-Struct to byte[]
-	newBytes, err := json.Marshal(&config)
-	if err != nil {
-		c.Fatalf("Error Marshal: %s", err)
-	}
-
-	// write back
-	if err := ioutil.WriteFile("/etc/docker/key.json", newBytes, 0400); err != nil {
-		c.Fatalf("Error ioutil.WriteFile: %s", err)
-	}
-
-	defer os.Remove("/etc/docker/key.json")
-
-	if err := s.d.StartWithError(); err == nil {
-		c.Fatalf("It should not be successful to start daemon with wrong key: %v", err)
-	}
-
-	content, err := s.d.ReadLogFile()
-	c.Assert(err, checker.IsNil)
-
-	if !strings.Contains(string(content), "Public Key ID does not match") {
-		c.Fatalf("Missing KeyID message from daemon logs: %s", string(content))
-	}
-}
-
 func (s *DockerDaemonSuite) TestDaemonRestartKillWait(c *check.C) {
 	s.d.StartWithBusybox(c)
 
diff --git a/integration-cli/docker_cli_pull_local_test.go b/integration-cli/docker_cli_pull_local_test.go
index 33d4ae5e7c..f2260dc3ac 100644
--- a/integration-cli/docker_cli_pull_local_test.go
+++ b/integration-cli/docker_cli_pull_local_test.go
@@ -55,10 +55,6 @@ func (s *DockerRegistrySuite) TestPullImageWithAliases(c *check.C) {
 	testPullImageWithAliases(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPullImageWithAliases(c *check.C) {
-	testPullImageWithAliases(c)
-}
-
 // testConcurrentPullWholeRepo pulls the same repo concurrently.
 func testConcurrentPullWholeRepo(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
@@ -111,10 +107,6 @@ func (s *DockerRegistrySuite) testConcurrentPullWholeRepo(c *check.C) {
 	testConcurrentPullWholeRepo(c)
 }
 
-func (s *DockerSchema1RegistrySuite) testConcurrentPullWholeRepo(c *check.C) {
-	testConcurrentPullWholeRepo(c)
-}
-
 // testConcurrentFailingPull tries a concurrent pull that doesn't succeed.
 func testConcurrentFailingPull(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
@@ -142,10 +134,6 @@ func (s *DockerRegistrySuite) testConcurrentFailingPull(c *check.C) {
 	testConcurrentFailingPull(c)
 }
 
-func (s *DockerSchema1RegistrySuite) testConcurrentFailingPull(c *check.C) {
-	testConcurrentFailingPull(c)
-}
-
 // testConcurrentPullMultipleTags pulls multiple tags from the same repo
 // concurrently.
 func testConcurrentPullMultipleTags(c *check.C) {
@@ -198,10 +186,6 @@ func (s *DockerRegistrySuite) TestConcurrentPullMultipleTags(c *check.C) {
 	testConcurrentPullMultipleTags(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestConcurrentPullMultipleTags(c *check.C) {
-	testConcurrentPullMultipleTags(c)
-}
-
 // testPullIDStability verifies that pushing an image and pulling it back
 // preserves the image ID.
 func testPullIDStability(c *check.C) {
@@ -259,10 +243,6 @@ func (s *DockerRegistrySuite) TestPullIDStability(c *check.C) {
 	testPullIDStability(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPullIDStability(c *check.C) {
-	testPullIDStability(c)
-}
-
 // #21213
 func testPullNoLayers(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/scratch", privateRegistryURL)
@@ -279,10 +259,6 @@ func (s *DockerRegistrySuite) TestPullNoLayers(c *check.C) {
 	testPullNoLayers(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPullNoLayers(c *check.C) {
-	testPullNoLayers(c)
-}
-
 func (s *DockerRegistrySuite) TestPullManifestList(c *check.C) {
 	testRequires(c, NotArm)
 	pushDigest, err := setupImage(c)
diff --git a/integration-cli/docker_cli_push_test.go b/integration-cli/docker_cli_push_test.go
index 0f0df1ab24..2ca205c831 100644
--- a/integration-cli/docker_cli_push_test.go
+++ b/integration-cli/docker_cli_push_test.go
@@ -30,10 +30,6 @@ func (s *DockerRegistrySuite) TestPushBusyboxImage(c *check.C) {
 	testPushBusyboxImage(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPushBusyboxImage(c *check.C) {
-	testPushBusyboxImage(c)
-}
-
 // pushing an image without a prefix should throw an error
 func (s *DockerSuite) TestPushUnprefixedRepo(c *check.C) {
 	out, _, err := dockerCmdWithError("push", "busybox")
@@ -53,10 +49,6 @@ func (s *DockerRegistrySuite) TestPushUntagged(c *check.C) {
 	testPushUntagged(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPushUntagged(c *check.C) {
-	testPushUntagged(c)
-}
-
 func testPushBadTag(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox:latest", privateRegistryURL)
 	expected := "does not exist"
@@ -70,10 +62,6 @@ func (s *DockerRegistrySuite) TestPushBadTag(c *check.C) {
 	testPushBadTag(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPushBadTag(c *check.C) {
-	testPushBadTag(c)
-}
-
 func testPushMultipleTags(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
 	repoTag1 := fmt.Sprintf("%v/dockercli/busybox:t1", privateRegistryURL)
@@ -115,10 +103,6 @@ func (s *DockerRegistrySuite) TestPushMultipleTags(c *check.C) {
 	testPushMultipleTags(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPushMultipleTags(c *check.C) {
-	testPushMultipleTags(c)
-}
-
 func testPushEmptyLayer(c *check.C) {
 	repoName := fmt.Sprintf("%v/dockercli/emptylayer", privateRegistryURL)
 	emptyTarball, err := ioutil.TempFile("", "empty_tarball")
@@ -146,10 +130,6 @@ func (s *DockerRegistrySuite) TestPushEmptyLayer(c *check.C) {
 	testPushEmptyLayer(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestPushEmptyLayer(c *check.C) {
-	testPushEmptyLayer(c)
-}
-
 // testConcurrentPush pushes multiple tags to the same repo
 // concurrently.
 func testConcurrentPush(c *check.C) {
@@ -200,10 +180,6 @@ func (s *DockerRegistrySuite) TestConcurrentPush(c *check.C) {
 	testConcurrentPush(c)
 }
 
-func (s *DockerSchema1RegistrySuite) TestConcurrentPush(c *check.C) {
-	testConcurrentPush(c)
-}
-
 func (s *DockerRegistrySuite) TestCrossRepositoryLayerPush(c *check.C) {
 	sourceRepoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
 	// tag the image to upload it to the private registry
@@ -245,39 +221,6 @@ func (s *DockerRegistrySuite) TestCrossRepositoryLayerPush(c *check.C) {
 	c.Assert(out4, check.Equals, "hello world")
 }
 
-func (s *DockerSchema1RegistrySuite) TestCrossRepositoryLayerPushNotSupported(c *check.C) {
-	sourceRepoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
-	// tag the image to upload it to the private registry
-	dockerCmd(c, "tag", "busybox", sourceRepoName)
-	// push the image to the registry
-	out1, _, err := dockerCmdWithError("push", sourceRepoName)
-	c.Assert(err, check.IsNil, check.Commentf("pushing the image to the private registry has failed: %s", out1))
-	// ensure that none of the layers were mounted from another repository during push
-	c.Assert(strings.Contains(out1, "Mounted from"), check.Equals, false)
-
-	digest1 := reference.DigestRegexp.FindString(out1)
-	c.Assert(len(digest1), checker.GreaterThan, 0, check.Commentf("no digest found for pushed manifest"))
-
-	destRepoName := fmt.Sprintf("%v/dockercli/crossrepopush", privateRegistryURL)
-	// retag the image to upload the same layers to another repo in the same registry
-	dockerCmd(c, "tag", "busybox", destRepoName)
-	// push the image to the registry
-	out2, _, err := dockerCmdWithError("push", destRepoName)
-	c.Assert(err, check.IsNil, check.Commentf("pushing the image to the private registry has failed: %s", out2))
-	// schema1 registry should not support cross-repo layer mounts, so ensure that this does not happen
-	c.Assert(strings.Contains(out2, "Mounted from"), check.Equals, false)
-
-	digest2 := reference.DigestRegexp.FindString(out2)
-	c.Assert(len(digest2), checker.GreaterThan, 0, check.Commentf("no digest found for pushed manifest"))
-	c.Assert(digest1, check.Not(check.Equals), digest2)
-
-	// ensure that we can pull and run the second pushed repository
-	dockerCmd(c, "rmi", destRepoName)
-	dockerCmd(c, "pull", destRepoName)
-	out3, _ := dockerCmd(c, "run", destRepoName, "echo", "-n", "hello world")
-	c.Assert(out3, check.Equals, "hello world")
-}
-
 func (s *DockerRegistryAuthHtpasswdSuite) TestPushNoCredentialsNoRetry(c *check.C) {
 	repoName := fmt.Sprintf("%s/busybox", privateRegistryURL)
 	dockerCmd(c, "tag", "busybox", repoName)
diff --git a/integration/system/uuid_test.go b/integration/system/uuid_test.go
new file mode 100644
index 0000000000..b93b335ca0
--- /dev/null
+++ b/integration/system/uuid_test.go
@@ -0,0 +1,20 @@
+package system
+
+import (
+	"context"
+	"testing"
+
+	"github.com/pborman/uuid"
+	"gotest.tools/assert"
+)
+
+func TestUUIDGeneration(t *testing.T) {
+	defer setupTest(t)()
+
+	c := testEnv.APIClient()
+	info, err := c.Info(context.Background())
+	assert.NilError(t, err)
+
+	id := uuid.Parse(info.ID)
+	assert.Equal(t, id != nil, true)
+}
diff --git a/internal/test/fixtures/plugin/plugin.go b/internal/test/fixtures/plugin/plugin.go
index 1af6584269..93f5f99fed 100644
--- a/internal/test/fixtures/plugin/plugin.go
+++ b/internal/test/fixtures/plugin/plugin.go
@@ -92,7 +92,7 @@ func CreateInRegistry(ctx context.Context, repo string, auth *types.AuthConfig,
 		return nil, nil
 	}
 
-	regService, err := registry.NewService(registry.ServiceOptions{V2Only: true})
+	regService, err := registry.NewService(registry.ServiceOptions{})
 	if err != nil {
 		return err
 	}
diff --git a/registry/config.go b/registry/config.go
index de5a526b69..6bb9258c9b 100644
--- a/registry/config.go
+++ b/registry/config.go
@@ -19,16 +19,11 @@ type ServiceOptions struct {
 	AllowNondistributableArtifacts []string `json:"allow-nondistributable-artifacts,omitempty"`
 	Mirrors                        []string `json:"registry-mirrors,omitempty"`
 	InsecureRegistries             []string `json:"insecure-registries,omitempty"`
-
-	// V2Only controls access to legacy registries.  If it is set to true via the
-	// command line flag the daemon will not attempt to contact v1 legacy registries
-	V2Only bool `json:"disable-legacy-registry,omitempty"`
 }
 
 // serviceConfig holds daemon configuration for the registry service.
 type serviceConfig struct {
 	registrytypes.ServiceConfig
-	V2Only bool
 }
 
 var (
@@ -76,7 +71,6 @@ func newServiceConfig(options ServiceOptions) (*serviceConfig, error) {
 			// Hack: Bypass setting the mirrors to IndexConfigs since they are going away
 			// and Mirrors are only for the official registry anyways.
 		},
-		V2Only: options.V2Only,
 	}
 	if err := config.LoadAllowNondistributableArtifacts(options.AllowNondistributableArtifacts); err != nil {
 		return nil, err
diff --git a/registry/service.go b/registry/service.go
index b441970ff1..08f5c7a4e1 100644
--- a/registry/service.go
+++ b/registry/service.go
@@ -309,20 +309,5 @@ func (s *DefaultService) LookupPushEndpoints(hostname string) (endpoints []APIEn
 }
 
 func (s *DefaultService) lookupEndpoints(hostname string) (endpoints []APIEndpoint, err error) {
-	endpoints, err = s.lookupV2Endpoints(hostname)
-	if err != nil {
-		return nil, err
-	}
-
-	if s.config.V2Only {
-		return endpoints, nil
-	}
-
-	legacyEndpoints, err := s.lookupV1Endpoints(hostname)
-	if err != nil {
-		return nil, err
-	}
-	endpoints = append(endpoints, legacyEndpoints...)
-
-	return endpoints, nil
+	return s.lookupV2Endpoints(hostname)
 }