[cli] Add windows service commands (#26442)

Adds a new `windows` command which is available when running on
a Windows hosts. The command includes two new subcommands:

* `service install`
* `service uninstall`

The `service install` command will install the called binary into
the Windows program files directory, create a new Windows service,
setup configuration and data directories, and register the service
with the Window eventlog. If the service and/or binary already
exist, the service will be stopped, service and eventlog updated
if needed, binary replaced, and the service started again.

The `service uninstall` command will stop the service, remove the
Windows service, and deregister the service with the eventlog. It
will not remove the configuration/data directory nor will it remove
the installed binary.

.changelog/26441.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+agent: Allow agent logging to the Windows Event Log
+```

.changelog/26442.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+cli: Add commands for installing and uninstalling Windows system service
+```

command/commands.go

@@ -5,7 +5,9 @@ package command
 
 import (
 	"fmt"
+	"maps"
 	"os"
+	"runtime"
 
 	"github.com/hashicorp/cli"
 	"github.com/hashicorp/nomad/command/agent"
@@ -1339,6 +1341,31 @@ func Commands(metaPtr *Meta, agentUi cli.Ui) map[string]cli.CommandFactory {
 		},
 	}
 
+	if runtime.GOOS == "windows" {
+		maps.Copy(all, map[string]cli.CommandFactory{
+			"windows": func() (cli.Command, error) {
+				return &WindowsCommand{
+					Meta: meta,
+				}, nil
+			},
+			"windows service": func() (cli.Command, error) {
+				return &WindowsServiceCommand{
+					Meta: meta,
+				}, nil
+			},
+			"windows service install": func() (cli.Command, error) {
+				return &WindowsServiceInstallCommand{
+					Meta: meta,
+				}, nil
+			},
+			"windows service uninstall": func() (cli.Command, error) {
+				return &WindowsServiceUninstallCommand{
+					Meta: meta,
+				}, nil
+			},
+		})
+	}
+
 	deprecated := map[string]cli.CommandFactory{
 		"client-config": func() (cli.Command, error) {
 			return &DeprecatedCommand{

command/windows.go

@@ -0,0 +1,35 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package command
+
+import (
+	"strings"
+
+	"github.com/hashicorp/cli"
+)
+
+type WindowsCommand struct {
+	Meta
+}
+
+func (c *WindowsCommand) Help() string {
+	helpText := `
+Usage: nomad windows <subcommand> [options]
+
+  This command groups subcommands for managing Nomad as a system service on Windows.
+
+  Service::
+
+      $ nomad windows service
+
+  Refer to the individual subcommand help for detailed usage information.
+`
+	return strings.TrimSpace(helpText)
+}
+
+func (c *WindowsCommand) Name() string { return "windows" }
+
+func (c *WindowsCommand) Synopsis() string { return "Manage Nomad as a system service on Windows" }
+
+func (c *WindowsCommand) Run(_ []string) int { return cli.RunResultHelp }

command/windows_service.go

@@ -0,0 +1,41 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package command
+
+import (
+	"strings"
+
+	"github.com/hashicorp/cli"
+)
+
+type WindowsServiceCommand struct {
+	Meta
+}
+
+func (c *WindowsServiceCommand) Help() string {
+	helpText := `
+Usage: nomad windows service <subcommand> [options]
+
+  This command groups subcommands for managing Nomad as a system service on Windows.
+
+  Install:
+
+      $ nomad windows service install
+
+  Uninstall:
+
+      $ nomad windows service uninstall
+
+  Refer to the individual subcommand help for detailed usage information.
+`
+	return strings.TrimSpace(helpText)
+}
+
+func (c *WindowsServiceCommand) Name() string { return "windows service" }
+
+func (c *WindowsServiceCommand) Synopsis() string {
+	return "Manage nomad as a system service on Windows"
+}
+
+func (c *WindowsServiceCommand) Run(_ []string) int { return cli.RunResultHelp }

command/windows_service_install.go

@@ -0,0 +1,365 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package command
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/hashicorp/nomad/helper/winsvc"
+	"github.com/posener/complete"
+)
+
+type windowsInstallOpts struct {
+	configDir, dataDir, installDir, binaryPath string
+	reinstall                                  bool
+}
+
+type WindowsServiceInstallCommand struct {
+	Meta
+	serviceManagerFn  func() (winsvc.WindowsServiceManager, error)
+	privilegedCheckFn func() bool
+	winPaths          winsvc.WindowsPaths
+}
+
+func (c *WindowsServiceInstallCommand) Synopsis() string {
+	return "Install the Nomad Windows system service"
+}
+
+func (c *WindowsServiceInstallCommand) AutocompleteFlags() complete.Flags {
+	return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetDefault),
+		complete.Flags{
+			"-config-dir":  complete.PredictDirs("*"),
+			"-data-dir":    complete.PredictDirs("*"),
+			"-install-dir": complete.PredictDirs("*"),
+			"-reinstall":   complete.PredictNothing,
+		})
+}
+
+func (c *WindowsServiceInstallCommand) Name() string { return "windows service install" }
+
+func (c *WindowsServiceInstallCommand) Help() string {
+	helpText := `
+Usage: nomad windows service install [options]
+
+  This command installs Nomad as a Windows system service.
+
+General Options:
+
+` + generalOptionsUsage(usageOptsDefault) + `
+
+Service Install Options:
+
+  -config-dir <dir>
+    Directory to hold the Nomad agent configuration. Defaults
+    to "{{.ProgramFiles}}\HashiCorp\nomad\bin"
+
+  -data-dir <dir>
+    Directory to hold the Nomad agent state. Defaults
+    to "{{.ProgramData}}\HashiCorp\nomad\data"
+
+  -install-dir <dir>
+    Directory to install the Nomad binary. Defaults
+    to "{{.ProgramData}}\HashiCorp\nomad\config"
+
+  -reinstall
+    Allow the nomad Windows service to be stopped during install.
+`
+	return strings.TrimSpace(helpText)
+}
+
+func (c *WindowsServiceInstallCommand) Run(args []string) int {
+	opts := &windowsInstallOpts{}
+
+	flags := c.Meta.FlagSet(c.Name(), FlagSetDefault)
+	flags.Usage = func() { c.Ui.Output(c.Help()) }
+	flags.StringVar(&opts.configDir, "config-dir", "", "")
+	flags.StringVar(&opts.dataDir, "data-dir", "", "")
+	flags.StringVar(&opts.installDir, "install-dir", "", "")
+	flags.BoolVar(&opts.reinstall, "reinstall", false, "")
+
+	if err := flags.Parse(args); err != nil {
+		return 1
+	}
+
+	if args = flags.Args(); len(args) > 0 {
+		c.Ui.Error("This command takes no arguments")
+		c.Ui.Error(commandErrorText(c))
+		return 1
+	}
+
+	// Set helper functions to defaults if unset
+	if c.winPaths == nil {
+		c.winPaths = winsvc.NewWindowsPaths()
+	}
+	if c.serviceManagerFn == nil {
+		c.serviceManagerFn = winsvc.NewWindowsServiceManager
+	}
+	if c.privilegedCheckFn == nil {
+		c.privilegedCheckFn = winsvc.IsPrivilegedProcess
+	}
+
+	// Check that command is being run with elevated permissions
+	if !c.privilegedCheckFn() {
+		c.Ui.Error("Service install must be run with Administator privileges")
+		return 1
+	}
+
+	c.Ui.Output("Installing nomad as a Windows service...")
+
+	m, err := c.serviceManagerFn()
+	if err != nil {
+		c.Ui.Error(fmt.Sprintf("Could not connect to Windows service manager - %s", err))
+		return 1
+	}
+	defer m.Close()
+
+	if err := c.performInstall(m, opts); err != nil {
+		c.Ui.Error(fmt.Sprintf("Service install failed: %s", err))
+		return 1
+	}
+
+	c.Ui.Info("Successfully installed nomad Windows service")
+	return 0
+}
+
+func (c *WindowsServiceInstallCommand) performInstall(m winsvc.WindowsServiceManager, opts *windowsInstallOpts) error {
+	// Check if the nomad service has already been
+	// registered. If so the service needs to be
+	// stopped before proceeding with the install.
+	exists, err := m.IsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME)
+	if err != nil {
+		return fmt.Errorf("unable to check for existing service - %w", err)
+	}
+
+	if exists {
+		nmdSvc, err := m.GetService(winsvc.WINDOWS_SERVICE_NAME)
+		if err != nil {
+			return fmt.Errorf("could not get existing service to stop - %w", err)
+		}
+
+		// If the service is running and the reinstall
+		// option was not set, return an error
+		running, err := nmdSvc.IsRunning()
+		if err != nil {
+			return fmt.Errorf("unable to determine service state - %w", err)
+		}
+		if running && !opts.reinstall {
+			return fmt.Errorf("service is already running. Please run the\ncommand again with -reinstall to stop the service and install.")
+		}
+
+		if running {
+			c.Ui.Output("  Stopping existing nomad service")
+			if err := nmdSvc.Stop(); err != nil {
+				return fmt.Errorf("unable to stop existing service - %w", err)
+			}
+		}
+	}
+
+	// Install the nomad binary into the system
+	if err = c.binaryInstall(opts); err != nil {
+		return fmt.Errorf("binary install failed - %w", err)
+	}
+
+	c.Ui.Output(fmt.Sprintf("  Nomad binary installed to: %s", opts.binaryPath))
+
+	// Create a configuration directory and add
+	// a basic configuration file if no configuration
+	// currently exists
+	if err = c.configInstall(opts); err != nil {
+		return fmt.Errorf("configuration install failed - %w", err)
+	}
+
+	c.Ui.Output(fmt.Sprintf("  Nomad configuration directory: %s", opts.configDir))
+	c.Ui.Output(fmt.Sprintf("  Nomad agent data directory: %s", opts.configDir))
+
+	// Now let's install that service
+	if err := c.serviceInstall(m, opts); err != nil {
+		return fmt.Errorf("service install failed - %w", err)
+	}
+
+	return nil
+}
+
+func (c *WindowsServiceInstallCommand) serviceInstall(m winsvc.WindowsServiceManager, opts *windowsInstallOpts) error {
+	var err error
+	var srvc winsvc.WindowsService
+	cmd := fmt.Sprintf("%s agent -config %s", opts.binaryPath, opts.configDir)
+
+	exists, err := m.IsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME)
+	if err != nil {
+		return fmt.Errorf("service registration check failed - %w", err)
+	}
+
+	// If the service already exists, open it and update. Otherwise
+	// create a new service.
+	if exists {
+		srvc, err = m.GetService(winsvc.WINDOWS_SERVICE_NAME)
+		if err != nil {
+			return fmt.Errorf("unable to get existing service - %w", err)
+		}
+		defer srvc.Close()
+		if err := srvc.Configure(winsvc.WindowsServiceConfiguration{
+			StartType:      winsvc.StartAutomatic,
+			DisplayName:    winsvc.WINDOWS_SERVICE_DISPLAY_NAME,
+			Description:    winsvc.WINDOWS_SERVICE_DESCRIPTION,
+			BinaryPathName: cmd,
+		}); err != nil {
+			return fmt.Errorf("unable to configure service - %w", err)
+		}
+	} else {
+		srvc, err = m.CreateService(winsvc.WINDOWS_SERVICE_NAME, opts.binaryPath,
+			winsvc.WindowsServiceConfiguration{
+				StartType:      winsvc.StartAutomatic,
+				DisplayName:    winsvc.WINDOWS_SERVICE_DISPLAY_NAME,
+				Description:    winsvc.WINDOWS_SERVICE_DESCRIPTION,
+				BinaryPathName: cmd,
+			},
+		)
+		if err != nil {
+			return fmt.Errorf("unable to create service - %w", err)
+		}
+		defer srvc.Close()
+	}
+
+	// Enable the service in the Windows eventlog
+	if err := srvc.EnableEventlog(); err != nil {
+		return fmt.Errorf("could not configure eventlog - %w", err)
+	}
+
+	// Ensure the service is stopped
+	if err := srvc.Stop(); err != nil {
+		return fmt.Errorf("could not stop service - %w", err)
+	}
+
+	// Start the service so the new binary is in use
+	if err := srvc.Start(); err != nil {
+		return fmt.Errorf("could not start service - %w", err)
+	}
+
+	return nil
+}
+
+func (c *WindowsServiceInstallCommand) configInstall(opts *windowsInstallOpts) error {
+	// If the config or data directory are unset, default them
+	if opts.configDir == "" {
+		opts.configDir = filepath.Join(winsvc.WINDOWS_INSTALL_APPDATA_DIRECTORY, "config")
+	}
+	if opts.dataDir == "" {
+		opts.dataDir = filepath.Join(winsvc.WINDOWS_INSTALL_APPDATA_DIRECTORY, "data")
+	}
+
+	var err error
+	if opts.configDir, err = c.winPaths.Expand(opts.configDir); err != nil {
+		return fmt.Errorf("cannot generate configuration path - %s", err)
+	}
+	if opts.dataDir, err = c.winPaths.Expand(opts.dataDir); err != nil {
+		return fmt.Errorf("cannot generate data path - %s", err)
+	}
+
+	// Ensure directories exist
+	if err = c.winPaths.CreateDirectory(opts.configDir, true); err != nil {
+		return fmt.Errorf("cannot create configuration directory - %s", err)
+	}
+
+	if err = c.winPaths.CreateDirectory(opts.dataDir, true); err != nil {
+		return fmt.Errorf("cannot create data directory - %s", err)
+	}
+
+	// Check if any configuration files exist
+	matches, _ := filepath.Glob(filepath.Join(opts.configDir, "*"))
+	if len(matches) < 1 {
+		f, err := os.Create(filepath.Join(opts.configDir, "config.hcl"))
+		if err != nil {
+			return fmt.Errorf("could not create default configuration file - %s", err)
+		}
+		fmt.Fprintf(f, strings.TrimSpace(`
+# Full configuration options can be found at https://developer.hashicorp.com/nomad/docs/configuration
+
+data_dir  = "%s"
+bind_addr = "0.0.0.0"
+
+server {
+  # license_path is required for Nomad Enterprise as of Nomad v1.1.1+
+  #license_path = "%s\license.hclic"
+  enabled          = true
+  bootstrap_expect = 1
+}
+
+client {
+  enabled = true
+  servers = ["127.0.0.1"]
+}
+
+log_level = "WARN"
+eventlog {
+  enabled = true
+  level   = "ERROR"
+}
+`), strings.ReplaceAll(opts.dataDir, `\`, `\\`), strings.ReplaceAll(opts.configDir, `\`, `\\`))
+		f.Close()
+		c.Ui.Output(fmt.Sprintf("  Added initial configuration file: %s", f.Name()))
+	}
+
+	return nil
+}
+
+func (c *WindowsServiceInstallCommand) binaryInstall(opts *windowsInstallOpts) error {
+	// Get the path to the currently executing nomad. This
+	// will be installed for the service to call.
+	exePath, err := os.Executable()
+	if err != nil {
+		return fmt.Errorf("cannot detect current nomad path - %s", err)
+	}
+
+	// Build the needed paths
+	if opts.installDir == "" {
+		opts.installDir = winsvc.WINDOWS_INSTALL_BIN_DIRECTORY
+	}
+	opts.installDir, err = c.winPaths.Expand(opts.installDir)
+	if err != nil {
+		return fmt.Errorf("cannot generate binary install path - %s", err)
+	}
+	opts.binaryPath = filepath.Join(opts.installDir, "nomad.exe")
+
+	// Ensure the install directory exists
+	if err = c.winPaths.CreateDirectory(opts.installDir, false); err != nil {
+		return fmt.Errorf("could not create binary install directory - %s", err)
+	}
+
+	// Create a new copy of the current binary to install
+	exeFile, err := os.Open(exePath)
+	if err != nil {
+		return fmt.Errorf("cannot open current nomad path for install - %s", err)
+	}
+	defer exeFile.Close()
+
+	// Copy into a temporary file which can then be moved
+	// into the correct location.
+	dstFile, err := os.CreateTemp(os.TempDir(), "nomad*")
+	if err != nil {
+		return fmt.Errorf("cannot create copy - %s", err)
+	}
+	defer dstFile.Close()
+
+	if _, err = io.Copy(dstFile, exeFile); err != nil {
+		return fmt.Errorf("cannot write nomad binary for install - %s", err)
+	}
+	dstFile.Close()
+
+	// With a copy ready to be moved into place, ensure that
+	// the path is clear then move the file.
+	if err = os.RemoveAll(opts.binaryPath); err != nil {
+		return fmt.Errorf("cannot remove existing nomad binary install - %s", err)
+	}
+
+	if err = os.Rename(dstFile.Name(), opts.binaryPath); err != nil {
+		return fmt.Errorf("cannot install new nomad binary - %s", err)
+	}
+
+	return nil
+}

command/windows_service_install_test.go

@@ -0,0 +1,391 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package command
+
+import (
+	"bytes"
+	"errors"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"text/template"
+
+	"github.com/hashicorp/cli"
+	"github.com/hashicorp/nomad/helper/winsvc"
+	"github.com/shoenig/test/must"
+)
+
+func TestWindowsServiceInstallCommand_Run(t *testing.T) {
+	t.Parallel()
+
+	freshInstallFn := func(m *winsvc.MockWindowsServiceManager) {
+		srv := m.NewMockWindowsService()
+		m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+		m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+		m.ExpectCreateService(winsvc.WINDOWS_SERVICE_NAME, "nomad.exe",
+			winsvc.WindowsServiceConfiguration{}, srv, nil)
+		srv.ExpectEnableEventlog(nil)
+		srv.ExpectStop(nil)
+		srv.ExpectStart(nil)
+	}
+	upgradeInstallFn := func(m *winsvc.MockWindowsServiceManager) {
+		srv := m.NewMockWindowsService()
+		m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+		m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+		m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+		m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+		srv.ExpectIsRunning(false, nil)
+		srv.ExpectConfigure(winsvc.WindowsServiceConfiguration{}, nil)
+		srv.ExpectEnableEventlog(nil)
+		srv.ExpectStop(nil)
+		srv.ExpectStart(nil)
+	}
+
+	testCases := []struct {
+		desc        string
+		args        []string
+		privilegeFn func() bool
+		setup       func(string, *winsvc.MockWindowsServiceManager)
+		after       func(string)
+		output      string
+		errOutput   string
+		status      int
+	}{
+		{
+			desc: "fresh install success",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				freshInstallFn(m)
+			},
+			output: "Success",
+			status: 0,
+		},
+		{
+			desc: "fresh install writes config",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				freshInstallFn(m)
+			},
+			after: func(dir string) {
+				must.FileExists(t, filepath.Join(dir, "programdata/HashiCorp/nomad/config/config.hcl"))
+			},
+			output: "initial configuration file",
+		},
+		{
+			desc: "fresh install binary file",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				freshInstallFn(m)
+			},
+			after: func(dir string) {
+				must.FileExists(t, filepath.Join(dir, "programfiles/HashiCorp/nomad/bin/nomad.exe"))
+			},
+			output: "binary installed",
+		},
+		{
+			desc: "fresh install configuration already exists",
+			setup: func(dir string, m *winsvc.MockWindowsServiceManager) {
+				cdir := filepath.Join(dir, "programdata/HashiCorp/nomad/config")
+				err := os.MkdirAll(cdir, 0o755)
+				must.NoError(t, err)
+				f, err := os.Create(filepath.Join(cdir, "custom.hcl"))
+				must.NoError(t, err)
+				f.Close()
+				freshInstallFn(m)
+			},
+			after: func(dir string) {
+				must.FileNotExists(t, filepath.Join(dir, "programdata/HashiCorp/nomad/config/config.hcl"))
+			},
+		},
+		{
+			desc: "fresh install binary already exists",
+			setup: func(dir string, m *winsvc.MockWindowsServiceManager) {
+				cdir := filepath.Join(dir, "programfiles/HashiCorp/nomad/bin")
+				err := os.MkdirAll(cdir, 0o755)
+				must.NoError(t, err)
+				// create empty binary file
+				f, err := os.Create(filepath.Join(cdir, "nomad.exe"))
+				must.NoError(t, err)
+				f.Close()
+				freshInstallFn(m)
+			},
+			after: func(dir string) {
+				s, err := os.Stat(filepath.Join(dir, "programfiles/HashiCorp/nomad/bin/nomad.exe"))
+				must.NoError(t, err)
+				// ensure binary file is not empty
+				must.NonZero(t, s.Size())
+			},
+		},
+		{
+			desc: "upgrade install success",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				upgradeInstallFn(m)
+			},
+			output: "Success",
+			status: 0,
+		},
+		{
+			desc:      "with arguments",
+			args:      []string{"any", "value"},
+			errOutput: "takes no arguments",
+			status:    1,
+		},
+		{
+			desc: "with -install-dir",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				freshInstallFn(m)
+			},
+			args: []string{"-install-dir", "{{.ProgramFiles}}/custom/bin"},
+			after: func(dir string) {
+				_, err := os.Stat(filepath.Join(dir, "programfiles/custom/bin/nomad.exe"))
+				must.NoError(t, err)
+			},
+		},
+		{
+			desc: "with -config-dir",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				freshInstallFn(m)
+			},
+			args: []string{"-config-dir", "{{.ProgramData}}/custom/nomad-configuration"},
+			after: func(dir string) {
+				_, err := os.Stat(filepath.Join(dir, "programdata/custom/nomad-configuration"))
+				must.NoError(t, err)
+			},
+		},
+		{
+			desc: "with -data-dir",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				freshInstallFn(m)
+			},
+			args: []string{"-data-dir", "{{.ProgramData}}/custom/nomad-data"},
+			after: func(dir string) {
+				_, err := os.Stat(filepath.Join(dir, "programdata/custom/nomad-data"))
+				must.NoError(t, err)
+			},
+		},
+		{
+			desc: "service registered check failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, errors.New("lookup failure"))
+			},
+			errOutput: "unable to check for existing service",
+			status:    1,
+		},
+		{
+			desc: "service registered check failure during service install",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, errors.New("lookup failure"))
+			},
+			errOutput: "registration check failed",
+			status:    1,
+		},
+		{
+			desc: "get existing service to stop failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, nil, errors.New("service get failure"))
+			},
+			errOutput: "could not get existing service",
+			status:    1,
+		},
+		{
+			desc: "stop existing service failure",
+			args: []string{"-reinstall"},
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectIsRunning(true, nil)
+				srv.ExpectStop(errors.New("cannot stop"))
+			},
+			errOutput: "unable to stop existing service",
+			status:    1,
+		},
+		{
+			desc: "get existing service to configure failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectIsRunning(false, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, nil, errors.New("service get failure"))
+			},
+			errOutput: "unable to get existing service",
+			status:    1,
+		},
+		{
+			desc: "configure service failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				srv.ExpectIsRunning(false, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectConfigure(winsvc.WindowsServiceConfiguration{}, errors.New("configure failure"))
+			},
+			errOutput: "unable to configure service",
+			status:    1,
+		},
+		{
+			desc: "create service failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectCreateService(winsvc.WINDOWS_SERVICE_NAME, "nomad.exe", winsvc.WindowsServiceConfiguration{}, nil, errors.New("create service failure"))
+			},
+			errOutput: "unable to create service",
+			status:    1,
+		},
+		{
+			desc: "eventlog setup failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectCreateService(winsvc.WINDOWS_SERVICE_NAME, "nomad.exe", winsvc.WindowsServiceConfiguration{}, srv, nil)
+				srv.ExpectEnableEventlog(errors.New("eventlog configure failure"))
+			},
+			errOutput: "could not configure eventlog",
+			status:    1,
+		},
+		{
+			desc: "service stop pre-start failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectCreateService(winsvc.WINDOWS_SERVICE_NAME, "nomad.exe", winsvc.WindowsServiceConfiguration{}, srv, nil)
+				srv.ExpectEnableEventlog(nil)
+				srv.ExpectStop(errors.New("service stop failure"))
+			},
+			errOutput: "could not stop service",
+			status:    1,
+		},
+		{
+			desc: "service start failure",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+				m.ExpectCreateService(winsvc.WINDOWS_SERVICE_NAME, "nomad.exe", winsvc.WindowsServiceConfiguration{}, srv, nil)
+				srv.ExpectEnableEventlog(nil)
+				srv.ExpectStop(nil)
+				srv.ExpectStart(errors.New("service start failure"))
+			},
+			errOutput: "could not start service",
+			status:    1,
+		},
+		{
+			desc: "upgrade without -reinstall and service running",
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectIsRunning(true, nil)
+			},
+			errOutput: "again with -reinstall",
+			status:    1,
+		},
+		{
+			desc: "upgrade with -reinstall and service running",
+			args: []string{"-reinstall"},
+			setup: func(_ string, m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectIsRunning(true, nil)
+				srv.ExpectStop(nil)
+				srv.ExpectConfigure(winsvc.WindowsServiceConfiguration{}, nil)
+				srv.ExpectEnableEventlog(nil)
+				srv.ExpectStop(nil)
+				srv.ExpectStart(nil)
+			},
+		},
+		{
+			desc:        "not running as administator",
+			privilegeFn: func() bool { return false },
+			errOutput:   "must be run with Administator privileges",
+			status:      1,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			t.Parallel()
+			testDir := t.TempDir()
+
+			ui := cli.NewMockUi()
+			mgr := winsvc.NewMockWindowsServiceManager(t)
+			if tc.setup != nil {
+				tc.setup(testDir, mgr)
+			}
+
+			pfn := tc.privilegeFn
+			if pfn == nil {
+				pfn = func() bool { return true }
+			}
+
+			cmd := &WindowsServiceInstallCommand{
+				Meta: Meta{Ui: ui},
+				serviceManagerFn: func() (winsvc.WindowsServiceManager, error) {
+					return mgr, nil
+				},
+				winPaths:          createWinPaths(testDir),
+				privilegedCheckFn: pfn,
+			}
+			result := cmd.Run(tc.args)
+
+			out := ui.OutputWriter.String()
+			outErr := ui.ErrorWriter.String()
+			must.Eq(t, result, tc.status)
+			if tc.output != "" {
+				must.StrContains(t, out, tc.output)
+			}
+			if tc.errOutput != "" {
+				must.StrContains(t, outErr, tc.errOutput)
+			}
+			if tc.after != nil {
+				tc.after(testDir)
+			}
+
+			mgr.AssertExpectations()
+		})
+	}
+}
+
+func createWinPaths(rootDir string) winsvc.WindowsPaths {
+	return &testWindowsPaths{
+		SystemRoot:   filepath.Join(rootDir, "systemroot"),
+		SystemDrive:  rootDir,
+		ProgramData:  filepath.Join(rootDir, "programdata"),
+		ProgramFiles: filepath.Join(rootDir, "programfiles"),
+	}
+}
+
+type testWindowsPaths struct {
+	SystemRoot   string
+	SystemDrive  string
+	ProgramData  string
+	ProgramFiles string
+}
+
+func (t *testWindowsPaths) Expand(path string) (string, error) {
+	tmpl, err := template.New("expansion").Option("missingkey=error").Parse(path)
+	if err != nil {
+		return "", err
+	}
+	result := new(bytes.Buffer)
+	if err := tmpl.Execute(result, t); err != nil {
+		return "", err
+	}
+
+	return strings.ReplaceAll(result.String(), `\`, "/"), nil
+}
+
+func (t *testWindowsPaths) CreateDirectory(path string, _ bool) error {
+	return os.MkdirAll(path, 0o755)
+}

command/windows_service_uninstall.go

@@ -0,0 +1,121 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/hashicorp/nomad/helper/winsvc"
+	"github.com/posener/complete"
+)
+
+type WindowsServiceUninstallCommand struct {
+	Meta
+	serviceManagerFn  func() (winsvc.WindowsServiceManager, error)
+	privilegedCheckFn func() bool
+}
+
+func (c *WindowsServiceUninstallCommand) AutoCompleteFlags() complete.Flags {
+	return c.Meta.AutocompleteFlags(FlagSetDefault)
+}
+
+func (c *WindowsServiceUninstallCommand) Synopsis() string {
+	return "Uninstall the nomad Windows system service"
+}
+
+func (c *WindowsServiceUninstallCommand) Name() string { return "windows service uninstall" }
+
+func (c *WindowsServiceUninstallCommand) Help() string {
+	helpText := `
+Usage: nomad windows service uninstall [options]
+
+  This command uninstalls nomad as a Windows system service.
+
+General Options:
+
+` + generalOptionsUsage(usageOptsDefault)
+	return strings.TrimSpace(helpText)
+}
+
+func (c *WindowsServiceUninstallCommand) Run(args []string) int {
+	flags := c.Meta.FlagSet(c.Name(), FlagSetDefault)
+	flags.Usage = func() { c.Ui.Output(c.Help()) }
+
+	if err := flags.Parse(args); err != nil {
+		return 1
+	}
+
+	if args = flags.Args(); len(args) > 0 {
+		c.Ui.Error("This command takes no arguments")
+		c.Ui.Error(commandErrorText(c))
+		return 1
+	}
+
+	// Set helper functions to default if unset
+	if c.serviceManagerFn == nil {
+		c.serviceManagerFn = winsvc.NewWindowsServiceManager
+	}
+	if c.privilegedCheckFn == nil {
+		c.privilegedCheckFn = winsvc.IsPrivilegedProcess
+	}
+
+	// Check that command is being run with elevated permissions
+	if !c.privilegedCheckFn() {
+		c.Ui.Error("Service uninstall must be run with Administator privileges")
+		return 1
+	}
+
+	c.Ui.Output("Uninstalling nomad Windows service...")
+
+	m, err := c.serviceManagerFn()
+	if err != nil {
+		c.Ui.Error(fmt.Sprintf("Could not connect to Windows service manager - %s", err))
+		return 1
+	}
+	defer m.Close()
+
+	if err := c.performUninstall(m); err != nil {
+		c.Ui.Error(fmt.Sprintf("Service uninstall failed: %s", err))
+		return 1
+	}
+
+	c.Ui.Info("Successfully uninstalled nomad Windows service")
+	return 0
+}
+
+func (c *WindowsServiceUninstallCommand) performUninstall(m winsvc.WindowsServiceManager) error {
+	// Check that the nomad service is currently registered
+	exists, err := m.IsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME)
+	if err != nil {
+		return fmt.Errorf("unable to check for existing service - %w", err)
+	}
+
+	if !exists {
+		return nil
+	}
+
+	// Grab the service and ensure the service is stopped
+	srvc, err := m.GetService(winsvc.WINDOWS_SERVICE_NAME)
+	if err != nil {
+		return fmt.Errorf("could not get existing service - %w", err)
+	}
+	defer srvc.Close()
+
+	if err := srvc.Stop(); err != nil {
+		return fmt.Errorf("unable to stop service - %w", err)
+	}
+
+	// Remove the service from the event log
+	if err := srvc.DisableEventlog(); err != nil {
+		return fmt.Errorf("could not remove eventlog configuration - %w", err)
+	}
+
+	// Finally, delete the service
+	if err := srvc.Delete(); err != nil {
+		return fmt.Errorf("could not delete service - %w", err)
+	}
+
+	return nil
+}

command/windows_service_uninstall_test.go

@@ -0,0 +1,146 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package command
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/hashicorp/cli"
+	"github.com/hashicorp/nomad/helper/winsvc"
+	"github.com/shoenig/test/must"
+)
+
+func TestWindowsServiceUninstallCommand_Run(t *testing.T) {
+	testCases := []struct {
+		desc        string
+		args        []string
+		privilegeFn func() bool
+		setup       func(*winsvc.MockWindowsServiceManager)
+		output      string
+		errOutput   string
+		status      int
+	}{
+		{
+			desc: "service installed",
+			setup: func(m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectStop(nil)
+				srv.ExpectDisableEventlog(nil)
+				srv.ExpectDelete(nil)
+			},
+			output: "uninstalled nomad",
+		},
+		{
+			desc: "service not installed",
+			setup: func(m *winsvc.MockWindowsServiceManager) {
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, nil)
+			},
+			output: "uninstalled nomad",
+		},
+		{
+			desc: "service registration check failure",
+			setup: func(m *winsvc.MockWindowsServiceManager) {
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, false, errors.New("registered check failure"))
+			},
+			errOutput: "unable to check for existing service",
+			status:    1,
+		},
+		{
+			desc: "get service failure",
+			setup: func(m *winsvc.MockWindowsServiceManager) {
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, nil, errors.New("get service failure"))
+			},
+			errOutput: "could not get existing service",
+			status:    1,
+		},
+		{
+			desc: "service stop failure",
+			setup: func(m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectStop(errors.New("service stop failure"))
+			},
+			errOutput: "unable to stop service",
+			status:    1,
+		},
+		{
+			desc: "disable eventlog failure",
+			setup: func(m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectStop(nil)
+				srv.ExpectDisableEventlog(errors.New("disable eventlog failure"))
+			},
+			errOutput: "could not remove eventlog configuration",
+			status:    1,
+		},
+		{
+			desc: "delete service failure",
+			setup: func(m *winsvc.MockWindowsServiceManager) {
+				srv := m.NewMockWindowsService()
+				m.ExpectIsServiceRegistered(winsvc.WINDOWS_SERVICE_NAME, true, nil)
+				m.ExpectGetService(winsvc.WINDOWS_SERVICE_NAME, srv, nil)
+				srv.ExpectStop(nil)
+				srv.ExpectDisableEventlog(nil)
+				srv.ExpectDelete(errors.New("service delete failure"))
+			},
+			errOutput: "could not delete service",
+			status:    1,
+		},
+		{
+			desc:      "with arguments",
+			args:      []string{"any", "value"},
+			errOutput: "command takes no arguments",
+			status:    1,
+		},
+		{
+			desc:        "not running as administator",
+			privilegeFn: func() bool { return false },
+			errOutput:   "must be run with Administator privileges",
+			status:      1,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			ui := cli.NewMockUi()
+			mgr := winsvc.NewMockWindowsServiceManager(t)
+			if tc.setup != nil {
+				tc.setup(mgr)
+			}
+
+			pfn := tc.privilegeFn
+			if pfn == nil {
+				pfn = func() bool { return true }
+			}
+
+			cmd := &WindowsServiceUninstallCommand{
+				Meta: Meta{Ui: ui},
+				serviceManagerFn: func() (winsvc.WindowsServiceManager, error) {
+					return mgr, nil
+				},
+				privilegedCheckFn: pfn,
+			}
+			result := cmd.Run(tc.args)
+
+			out := ui.OutputWriter.String()
+			outErr := ui.ErrorWriter.String()
+			must.Eq(t, result, tc.status)
+			if tc.output != "" {
+				must.StrContains(t, out, tc.output)
+			}
+			if tc.errOutput != "" {
+				must.StrContains(t, outErr, tc.errOutput)
+			}
+
+			mgr.AssertExpectations()
+		})
+	}
+}

helper/winsvc/mock_windows_service.go

@@ -0,0 +1,320 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: BUSL-1.1
+
+package winsvc
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/shoenig/test/must"
+)
+
+func NewMockWindowsServiceManager(t *testing.T) *MockWindowsServiceManager {
+	t.Helper()
+
+	m := &MockWindowsServiceManager{t: t}
+	return m
+}
+
+func NewMockWindowsService(t *testing.T) *MockWindowsService {
+	t.Helper()
+
+	m := &MockWindowsService{t: t}
+	return m
+}
+
+type MockWindowsServiceManager struct {
+	services             []*MockWindowsService
+	isServiceRegistereds []isServiceRegistered
+	getServices          []getService
+	createServices       []createService
+	t                    *testing.T
+}
+
+type isServiceRegistered struct {
+	name   string
+	result bool
+	err    error
+}
+
+type getService struct {
+	name   string
+	result WindowsService
+	err    error
+}
+
+type createService struct {
+	name, binaryPath string
+	config           WindowsServiceConfiguration
+	result           WindowsService
+	err              error
+}
+
+func (m *MockWindowsServiceManager) NewMockWindowsService() *MockWindowsService {
+	w := NewMockWindowsService(m.t)
+	m.services = append(m.services, w)
+	return w
+}
+
+func (m *MockWindowsServiceManager) ExpectIsServiceRegistered(name string, result bool, err error) {
+	m.isServiceRegistereds = append(m.isServiceRegistereds, isServiceRegistered{name, result, err})
+}
+
+func (m *MockWindowsServiceManager) ExpectGetService(name string, result WindowsService, err error) {
+	m.getServices = append(m.getServices, getService{name, result, err})
+}
+
+func (m *MockWindowsServiceManager) ExpectCreateService(name, binaryPath string, config WindowsServiceConfiguration, result WindowsService, err error) {
+	m.createServices = append(m.createServices, createService{name, binaryPath, config, result, err})
+}
+
+func (m *MockWindowsServiceManager) IsServiceRegistered(name string) (bool, error) {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.isServiceRegistereds,
+		must.Sprint("Unexpected call to IsServiceRegistered"))
+	call := m.isServiceRegistereds[0]
+	m.isServiceRegistereds = m.isServiceRegistereds[1:]
+	must.Eq(m.t, call.name, name,
+		must.Sprint("IsServiceRegistered received incorrect argument"))
+
+	return call.result, call.err
+}
+
+func (m *MockWindowsServiceManager) GetService(name string) (WindowsService, error) {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.getServices,
+		must.Sprint("Unexpected call to GetService"))
+	call := m.getServices[0]
+	m.getServices = m.getServices[1:]
+	must.Eq(m.t, call.name, name,
+		must.Sprint("GetService received incorrect argument"))
+
+	return call.result, call.err
+}
+
+func (m *MockWindowsServiceManager) CreateService(name, binaryPath string, config WindowsServiceConfiguration) (WindowsService, error) {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.createServices,
+		must.Sprint("Unexpected call to CreateService"))
+	call := m.createServices[0]
+	m.createServices = m.createServices[1:]
+	must.Eq(m.t, call.name, name,
+		must.Sprint("CreateService received incorrect argument"))
+	must.StrContains(m.t, binaryPath, call.binaryPath,
+		must.Sprint("CreateService received incorrect argument"))
+
+	if !reflect.ValueOf(call.config).IsZero() {
+		must.Eq(m.t, call.config, config,
+			must.Sprint("CreateService received incorrect argument"))
+	}
+
+	return call.result, call.err
+}
+
+func (m *MockWindowsServiceManager) Close() error { return nil }
+
+func (m *MockWindowsServiceManager) AssertExpectations() {
+	m.t.Helper()
+	must.SliceEmpty(m.t, m.isServiceRegistereds,
+		must.Sprintf("IsServiceRegistered expecting %d more invocations", len(m.isServiceRegistereds)))
+	must.SliceEmpty(m.t, m.getServices,
+		must.Sprintf("GetService expecting %d more invocations", len(m.getServices)))
+	must.SliceEmpty(m.t, m.createServices,
+		must.Sprintf("CreateService expecting %d more invocations", len(m.createServices)))
+
+	for _, srv := range m.services {
+		srv.AssertExpectations()
+	}
+}
+
+type MockWindowsService struct {
+	names            []string
+	configures       []configure
+	starts           []error
+	stops            []error
+	deletes          []error
+	isRunnings       []iscall
+	isStoppeds       []iscall
+	enableEventlogs  []error
+	disableEventlogs []error
+
+	t *testing.T
+}
+
+type configure struct {
+	config WindowsServiceConfiguration
+	err    error
+}
+
+type iscall struct {
+	result bool
+	err    error
+}
+
+func (m *MockWindowsService) ExpectName(result string) {
+	m.names = append(m.names, result)
+}
+
+func (m *MockWindowsService) ExpectConfigure(config WindowsServiceConfiguration, err error) {
+	m.configures = append(m.configures, configure{config, err})
+}
+
+func (m *MockWindowsService) ExpectStart(err error) {
+	m.starts = append(m.starts, err)
+}
+
+func (m *MockWindowsService) ExpectStop(err error) {
+	m.stops = append(m.stops, err)
+}
+
+func (m *MockWindowsService) ExpectDelete(err error) {
+	m.deletes = append(m.deletes, err)
+}
+
+func (m *MockWindowsService) ExpectIsRunning(result bool, err error) {
+	m.isRunnings = append(m.isRunnings, iscall{result, err})
+}
+
+func (m *MockWindowsService) ExpectIsStopped(result bool, err error) {
+	m.isStoppeds = append(m.isStoppeds, iscall{result, err})
+}
+
+func (m *MockWindowsService) ExpectEnableEventlog(err error) {
+	m.enableEventlogs = append(m.enableEventlogs, err)
+}
+
+func (m *MockWindowsService) ExpectDisableEventlog(err error) {
+	m.disableEventlogs = append(m.disableEventlogs, err)
+}
+
+func (m *MockWindowsService) Name() string {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.names,
+		must.Sprint("Unexpected call to Name"))
+	name := m.names[0]
+	m.names = m.names[1:]
+
+	return name
+}
+
+func (m *MockWindowsService) Configure(config WindowsServiceConfiguration) error {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.configures,
+		must.Sprint("Unexpected call to Configure"))
+	call := m.configures[0]
+	m.configures = m.configures[1:]
+	if !reflect.ValueOf(call.config).IsZero() {
+		must.Eq(m.t, call.config, config,
+			must.Sprint("Configure received incorrect argument"))
+	}
+
+	return call.err
+}
+
+func (m *MockWindowsService) Start() error {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.starts,
+		must.Sprint("Unexpected call to Start"))
+	err := m.starts[0]
+	m.starts = m.starts[1:]
+
+	return err
+}
+
+func (m *MockWindowsService) Stop() error {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.stops,
+		must.Sprint("Unexpected call to Stop"))
+	err := m.stops[0]
+	m.stops = m.stops[1:]
+
+	return err
+}
+
+func (m *MockWindowsService) Delete() error {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.deletes,
+		must.Sprint("Unexpected call to Delete"))
+	err := m.deletes[0]
+	m.deletes = m.deletes[1:]
+
+	return err
+}
+
+func (m *MockWindowsService) IsRunning() (bool, error) {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.isRunnings,
+		must.Sprint("Unexpected call to IsRunning"))
+	call := m.isRunnings[0]
+	m.isRunnings = m.isRunnings[1:]
+
+	return call.result, call.err
+}
+
+func (m *MockWindowsService) IsStopped() (bool, error) {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.isStoppeds,
+		must.Sprint("Unexpected call to IsStopped"))
+	call := m.isStoppeds[0]
+	m.isStoppeds = m.isStoppeds[1:]
+
+	return call.result, call.err
+}
+
+func (m *MockWindowsService) EnableEventlog() error {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.enableEventlogs,
+		must.Sprint("Unexpected call to EnableEventlog"))
+	err := m.enableEventlogs[0]
+	m.enableEventlogs = m.enableEventlogs[1:]
+
+	return err
+}
+
+func (m *MockWindowsService) DisableEventlog() error {
+	m.t.Helper()
+
+	must.SliceNotEmpty(m.t, m.disableEventlogs,
+		must.Sprint("Unexpected call to DisableEventlog"))
+	err := m.disableEventlogs[0]
+	m.disableEventlogs = m.disableEventlogs[1:]
+
+	return err
+}
+
+func (m *MockWindowsService) Close() error { return nil }
+
+func (m *MockWindowsService) AssertExpectations() {
+	m.t.Helper()
+
+	must.SliceEmpty(m.t, m.names,
+		must.Sprintf("Name expecting %d more invocations", len(m.names)))
+	must.SliceEmpty(m.t, m.configures,
+		must.Sprintf("Configure expecting %d more invocations", len(m.configures)))
+	must.SliceEmpty(m.t, m.starts,
+		must.Sprintf("Start expecting %d more invocations", len(m.starts)))
+	must.SliceEmpty(m.t, m.stops,
+		must.Sprintf("Stop expecting %d more invocations", len(m.stops)))
+	must.SliceEmpty(m.t, m.deletes,
+		must.Sprintf("Delete expecting %d more invocations", len(m.deletes)))
+	must.SliceEmpty(m.t, m.isRunnings,
+		must.Sprintf("IsRunning expecting %d more invocations", len(m.isRunnings)))
+	must.SliceEmpty(m.t, m.isStoppeds,
+		must.Sprintf("IsStopped expecting %d more invocations", len(m.isStoppeds)))
+	must.SliceEmpty(m.t, m.enableEventlogs,
+		must.Sprintf("EnableEventlog expecting %d more invocations", len(m.enableEventlogs)))
+	must.SliceEmpty(m.t, m.disableEventlogs,
+		must.Sprintf("DisableEventlog expecting %d more invocations", len(m.disableEventlogs)))
+}

website/content/commands/agent.mdx

@@ -129,6 +129,10 @@ You may, however, may pass the following configuration options as CLI arguments:
 - `-encrypt`: Set the Serf encryption key. See the [Encryption Overview][] for
   more details.
 
+- `-eventlog`: Equivalent to the [eventlog.enabled][] config option.
+
+- `-eventlog-level`: Equivalent to the [eventlog.level][] config option.
+
 - `-join=<address>`: Address of another agent to join upon starting up. This can
   be specified multiple times to specify multiple agents to join.
 
@@ -231,6 +235,8 @@ You may, however, may pass the following configuration options as CLI arguments:
 [datacenter]: /nomad/docs/configuration#datacenter
 [enabled]: /nomad/docs/configuration/acl#enabled
 [encryption overview]: /nomad/docs/secure/traffic/gossip-encryption
+[eventlog.enabled]: /nomad/docs/configuration#eventlog_enabled
+[eventlog.level]: /nomad/docs/configuration#eventlog_level
 [key_file]: /nomad/docs/configuration/consul#key_file
 [log_include_location]: /nomad/docs/configuration#log_include_location
 [log_json]: /nomad/docs/configuration#log_json

website/content/commands/windows/index.mdx

@@ -0,0 +1,22 @@
+---
+layout: docs
+page_title: 'nomad windows command reference'
+description: |
+  The `nomad windows` command interacts with the Windows host platform. Install or uninstall Nomad as a Windows service.
+---
+
+# `nomad windows` command reference 
+
+Use the `windows` command to interact with Windows host platforms.
+
+## Usage 
+
+Usage: `nomad windows <subcommand> [options]`
+
+Run `nomad windows <subcommand> -h` for help on that subcommand. The following subcommands are available:
+
+- [`windows service install`][install] - Install Nomad as a Windows service
+- [`windows service uninstall`][uninstall] - Uninstall Nomad as a Windows service
+
+[install]: /nomad/commands/windows/service-install
+[uninstall]: /nomad/commands/windows/service-uninstall

website/content/commands/windows/service-install.mdx

@@ -0,0 +1,50 @@
+---
+layout: docs
+page_title: 'nomad windows service install command reference'
+description: |
+  The `nomad windows service install` command installs the Nomad binary
+  and creates a Windows service.
+---
+
+# `nomad windows service install` command reference
+
+The `windows service install` command installs the Nomad binary and
+creates a Windows service.
+
+## Usage
+
+```plaintext
+nomad windows service install
+```
+
+The `windows service install` command installs the `nomad` binary used to
+run this command, creates a data and configuration directory, writes a basic
+Nomad configuration file, creates a Windows service to run Nomad, and
+registers the service with Windows Event Log.
+
+If Nomad has been previously installed using this command, subsequent
+executions will do the following:
+
+1. Stop the service if it is running
+1. Install the currently executing nomad binary
+1. Ensure data and configuration directories exist
+1. Write a configuration file if no configuration files are found
+1. Update the service if needed
+1. Update the Event Log configuration if needed.
+
+## Options
+
+- `-config-dir <dir>`: Directory to hold the Nomad agent configuration.
+  Defaults to "{{.ProgramFiles}}\HashiCorp\nomad\bin"
+
+- `-data-dir <dir>`: Directory to hold the Nomad agent state. Defaults
+  to "{{.ProgramData}}\HashiCorp\nomad\data"
+
+- `-install-dir <dir>`: Directory to install the Nomad binary. Defaults 
+  to "{{.ProgramData}}\HashiCorp\nomad\config"
+
+- `-reinstall`: Allow the nomad Windows service to be stopped during install.
+
+## General options
+
+@include 'general_options.mdx'

website/content/commands/windows/service-uninstall.mdx

@@ -0,0 +1,22 @@
+---
+layout: docs
+page_title: 'nomad windows service uninstall command reference'
+description: |
+  The `nomad windows service uninstall` command removes the Nomad
+  Windows service.
+---
+
+# `nomad windows service uninstall` command reference
+
+The `windows service uninstall` command removes the Nomad Windows service.
+
+## Usage
+
+```plaintext
+nomad windows service uninstall
+```
+
+The `windows service uninstall` command stops the Nomad service if
+it is currently running, deregisters the service with the Windows Event Log,
+and removes the Windows service. This command does not remove the installed
+Nomad binary or the data and configuration directories.

website/content/docs/configuration/index.mdx

@@ -176,6 +176,16 @@ testing.
   This option only works on Unix based systems. The log level inherits from
   the Nomad agent log set in `log_level`
 
+- `eventlog` - This is a nested object that configures the behavior with
+  with Windows Event Log. The following parameters are available:
+
+  - `enabled` - Enable sending Nomad agent logs to the Windows Event Log.
+
+  - `level` -  `(string: "ERROR")` - Specifies the verbosity of logs the Nomad
+    agent outputs. Valid log levels include `ERROR`, `WARN`, or `INFO` in
+    increasing order of verbosity. Level must be of equal or less verbosity as
+    defined for the [`log_level`](#log_level) parameter.
+
 - `http_api_response_headers` `(map<string|string>: nil)` - Specifies
   user-defined headers to add to the HTTP API responses.
 

website/content/docs/deploy/production/windows-service.mdx

@@ -7,9 +7,12 @@ description: |-
 
 # Install Nomad as a Windows service
 
-Nomad can be run as a native Windows service. In order to do this, you will need
-to register the Nomad application with the Windows Service Control Manager using
-[`sc.exe`], configure Nomad to log to a file, and then start the Nomad service.
+You may run Nomad as a native Windows service. Use the [windows service install][]
+command to install Nomad and create the Windows service.
+
+You may also set up the Nomad Windows service manually. Use [`sc.exe`] to register
+the Nomad application with the Windows Service Control Manager, configure Nomad to
+log to a file, and then start the Nomad service.
 
 ~> **Note:** These steps should be run in a PowerShell session with Administrator
 capabilities.
@@ -93,3 +96,4 @@ restart of Nomad service is not sufficient.
 [`sc.exe`]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms682107(v=vs.85).aspx
 [download]: /nomad/downloads
 [logging]: /nomad/docs/configuration#log_file
+[windows service install]: /nomad/docs/commands/windows/service-install

website/data/commands-nav-data.json

@@ -1053,5 +1053,22 @@
         "path": "volume/status"
       }
     ]
+  },
+  {
+    "title": "windows",
+    "routes": [
+      {
+        "title": "Overview",
+        "path": "windows"
+      },
+      {
+        "title": "service install",
+        "path": "windows/service-install"
+      },
+      {
+        "title": "service uninstall",
+        "path": "windows/service-uninstall"
+      }
+    ]
   }
 ]