コード例 #1
0
ファイル: raw_exec.go プロジェクト: MansM/nomad
func (d *RawExecDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
	var driverConfig ExecDriverConfig
	if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
		return nil, err
	}
	// Get the tasks local directory.
	taskName := d.DriverContext.taskName
	taskDir, ok := ctx.AllocDir.TaskDirs[taskName]
	if !ok {
		return nil, fmt.Errorf("Could not find task directory for task: %v", d.DriverContext.taskName)
	}

	// Get the command to be ran
	command := driverConfig.Command
	if command == "" {
		return nil, fmt.Errorf("missing command for Raw Exec driver")
	}

	// Check if an artificat is specified and attempt to download it
	source, ok := task.Config["artifact_source"]
	if ok && source != "" {
		// Proceed to download an artifact to be executed.
		_, err := getter.GetArtifact(
			filepath.Join(taskDir, allocdir.TaskLocal),
			driverConfig.ArtifactSource,
			driverConfig.Checksum,
			d.logger,
		)
		if err != nil {
			return nil, err
		}
	}

	// Setup the command
	execCtx := executor.NewExecutorContext(d.taskEnv)
	cmd := executor.NewBasicExecutor(execCtx)
	executor.SetCommand(cmd, command, driverConfig.Args)
	if err := cmd.Limit(task.Resources); err != nil {
		return nil, fmt.Errorf("failed to constrain resources: %s", err)
	}

	// Populate environment variables
	cmd.Command().Env = d.taskEnv.EnvList()

	if err := cmd.ConfigureTaskDir(d.taskName, ctx.AllocDir); err != nil {
		return nil, fmt.Errorf("failed to configure task directory: %v", err)
	}

	if err := cmd.Start(); err != nil {
		return nil, fmt.Errorf("failed to start command: %v", err)
	}

	// Return a driver handle
	h := &execHandle{
		cmd:         cmd,
		killTimeout: d.DriverContext.KillTimeout(task),
		logger:      d.logger,
		doneCh:      make(chan struct{}),
		waitCh:      make(chan *cstructs.WaitResult, 1),
	}
	go h.run()
	return h, nil
}
コード例 #2
0
ファイル: qemu.go プロジェクト: bastiaanb/nomad
// Run an existing Qemu image. Start() will pull down an existing, valid Qemu
// image and save it to the Drivers Allocation Dir
func (d *QemuDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
	var driverConfig QemuDriverConfig
	if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
		return nil, err
	}

	if len(driverConfig.PortMap) > 1 {
		return nil, fmt.Errorf("Only one port_map block is allowed in the qemu driver config")
	}

	// Get the image source
	source, ok := task.Config["artifact_source"]
	if !ok || source == "" {
		return nil, fmt.Errorf("Missing source image Qemu driver")
	}

	// Qemu defaults to 128M of RAM for a given VM. Instead, we force users to
	// supply a memory size in the tasks resources
	if task.Resources == nil || task.Resources.MemoryMB == 0 {
		return nil, fmt.Errorf("Missing required Task Resource: Memory")
	}

	// Get the tasks local directory.
	taskDir, ok := ctx.AllocDir.TaskDirs[d.DriverContext.taskName]
	if !ok {
		return nil, fmt.Errorf("Could not find task directory for task: %v", d.DriverContext.taskName)
	}

	// Proceed to download an artifact to be executed.
	vmPath, err := getter.GetArtifact(
		filepath.Join(taskDir, allocdir.TaskLocal),
		driverConfig.ArtifactSource,
		driverConfig.Checksum,
		d.logger,
	)
	if err != nil {
		return nil, err
	}

	vmID := filepath.Base(vmPath)

	// Parse configuration arguments
	// Create the base arguments
	accelerator := "tcg"
	if driverConfig.Accelerator != "" {
		accelerator = driverConfig.Accelerator
	}
	// TODO: Check a lower bounds, e.g. the default 128 of Qemu
	mem := fmt.Sprintf("%dM", task.Resources.MemoryMB)

	args := []string{
		"qemu-system-x86_64",
		"-machine", "type=pc,accel=" + accelerator,
		"-name", vmID,
		"-m", mem,
		"-drive", "file=" + vmPath,
		"-nodefconfig",
		"-nodefaults",
		"-nographic",
	}

	// Check the Resources required Networks to add port mappings. If no resources
	// are required, we assume the VM is a purely compute job and does not require
	// the outside world to be able to reach it. VMs ran without port mappings can
	// still reach out to the world, but without port mappings it is effectively
	// firewalled
	protocols := []string{"udp", "tcp"}
	if len(task.Resources.Networks) > 0 && len(driverConfig.PortMap) == 1 {
		// Loop through the port map and construct the hostfwd string, to map
		// reserved ports to the ports listenting in the VM
		// Ex: hostfwd=tcp::22000-:22,hostfwd=tcp::80-:8080
		var forwarding []string
		taskPorts := task.Resources.Networks[0].MapLabelToValues(nil)
		for label, guest := range driverConfig.PortMap[0] {
			host, ok := taskPorts[label]
			if !ok {
				return nil, fmt.Errorf("Unknown port label %q", label)
			}

			for _, p := range protocols {
				forwarding = append(forwarding, fmt.Sprintf("hostfwd=%s::%d-:%d", p, host, guest))
			}
		}

		if len(forwarding) != 0 {
			args = append(args,
				"-netdev",
				fmt.Sprintf("user,id=user.0,%s", strings.Join(forwarding, ",")),
				"-device", "virtio-net,netdev=user.0",
			)
		}
	}

	// If using KVM, add optimization args
	if accelerator == "kvm" {
		args = append(args,
			"-enable-kvm",
			"-cpu", "host",
			// Do we have cores information available to the Driver?
			// "-smp", fmt.Sprintf("%d", cores),
		)
	}

	// Setup the command
	cmd := executor.NewBasicExecutor()
	executor.SetCommand(cmd, args[0], args[1:])
	if err := cmd.Limit(task.Resources); err != nil {
		return nil, fmt.Errorf("failed to constrain resources: %s", err)
	}

	if err := cmd.ConfigureTaskDir(d.taskName, ctx.AllocDir); err != nil {
		return nil, fmt.Errorf("failed to configure task directory: %v", err)
	}

	d.logger.Printf("[DEBUG] Starting QemuVM command: %q", strings.Join(args, " "))
	if err := cmd.Start(); err != nil {
		return nil, fmt.Errorf("failed to start command: %v", err)
	}
	d.logger.Printf("[INFO] Started new QemuVM: %s", vmID)

	// Create and Return Handle
	h := &qemuHandle{
		cmd:         cmd,
		killTimeout: d.DriverContext.KillTimeout(task),
		logger:      d.logger,
		doneCh:      make(chan struct{}),
		waitCh:      make(chan *cstructs.WaitResult, 1),
	}

	go h.run()
	return h, nil
}
コード例 #3
0
ファイル: raw_exec.go プロジェクト: rowhit/nomad
func (d *RawExecDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
	// Get the tasks local directory.
	taskName := d.DriverContext.taskName
	taskDir, ok := ctx.AllocDir.TaskDirs[taskName]
	if !ok {
		return nil, fmt.Errorf("Could not find task directory for task: %v", d.DriverContext.taskName)
	}

	// Get the command to be ran
	command, ok := task.Config["command"]
	if !ok || command == "" {
		return nil, fmt.Errorf("missing command for Raw Exec driver")
	}

	// Check if an artificat is specified and attempt to download it
	source, ok := task.Config["artifact_source"]
	if ok && source != "" {
		// Proceed to download an artifact to be executed.
		_, err := getter.GetArtifact(
			filepath.Join(taskDir, allocdir.TaskLocal),
			task.Config["artifact_source"],
			task.Config["checksum"],
			d.logger,
		)
		if err != nil {
			return nil, err
		}
	}

	// Get the environment variables.
	envVars := TaskEnvironmentVariables(ctx, task)

	// Look for arguments
	var args []string
	if argRaw, ok := task.Config["args"]; ok {
		args = append(args, argRaw)
	}

	// Setup the command
	cmd := executor.NewBasicExecutor()
	executor.SetCommand(cmd, command, args)
	if err := cmd.Limit(task.Resources); err != nil {
		return nil, fmt.Errorf("failed to constrain resources: %s", err)
	}

	// Populate environment variables
	cmd.Command().Env = envVars.List()

	if err := cmd.ConfigureTaskDir(d.taskName, ctx.AllocDir); err != nil {
		return nil, fmt.Errorf("failed to configure task directory: %v", err)
	}

	if err := cmd.Start(); err != nil {
		return nil, fmt.Errorf("failed to start command: %v", err)
	}

	// Return a driver handle
	h := &execHandle{
		cmd:    cmd,
		doneCh: make(chan struct{}),
		waitCh: make(chan error, 1),
	}
	go h.run()
	return h, nil
}