func (d *JavaDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
var driverConfig JavaDriverConfig
if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
return nil, err
}
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.
path, err := getter.GetArtifact(
taskDir,
driverConfig.ArtifactSource,
driverConfig.Checksum,
d.logger,
)
if err != nil {
return nil, err
}
jarName := filepath.Base(path)
args := []string{}
// Look for jvm options
if len(driverConfig.JvmOpts) != 0 {
d.logger.Printf("[DEBUG] driver.java: found JVM options: %s", driverConfig.JvmOpts)
args = append(args, driverConfig.JvmOpts...)
}
// Build the argument list.
args = append(args, "-jar", jarName)
if len(driverConfig.Args) != 0 {
args = append(args, driverConfig.Args...)
}
// Setup the command
// Assumes Java is in the $PATH, but could probably be detected
execCtx := executor.NewExecutorContext(d.taskEnv)
cmd := executor.Command(execCtx, "java", args...)
// Populate environment variables
cmd.Command().Env = d.taskEnv.EnvList()
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)
}
if err := cmd.Start(); err != nil {
return nil, fmt.Errorf("failed to start source: %v", err)
}
// Return a driver handle
h := &javaHandle{
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
}
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 err := validateCommand(command, "args"); err != nil {
return nil, err
}
// 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(
taskDir,
driverConfig.ArtifactSource,
driverConfig.Checksum,
d.logger,
)
if err != nil {
return nil, err
}
}
bin, err := discover.NomadExecutable()
if err != nil {
return nil, fmt.Errorf("unable to find the nomad binary: %v", err)
}
pluginLogFile := filepath.Join(taskDir, fmt.Sprintf("%s-executor.out", task.Name))
pluginConfig := &plugin.ClientConfig{
Cmd: exec.Command(bin, "executor", pluginLogFile),
}
exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
if err != nil {
return nil, err
}
executorCtx := &executor.ExecutorContext{
TaskEnv: d.taskEnv,
AllocDir: ctx.AllocDir,
TaskName: task.Name,
TaskResources: task.Resources,
LogConfig: task.LogConfig,
}
ps, err := exec.LaunchCmd(&executor.ExecCommand{Cmd: command, Args: driverConfig.Args}, executorCtx)
if err != nil {
pluginClient.Kill()
return nil, fmt.Errorf("error starting process via the plugin: %v", err)
}
d.logger.Printf("[DEBUG] driver.raw_exec: started process with pid: %v", ps.Pid)
// Return a driver handle
h := &rawExecHandle{
pluginClient: pluginClient,
executor: exec,
userPid: ps.Pid,
killTimeout: d.DriverContext.KillTimeout(task),
allocDir: ctx.AllocDir,
version: d.config.Version,
logger: d.logger,
doneCh: make(chan struct{}),
waitCh: make(chan *cstructs.WaitResult, 1),
}
go h.run()
return h, nil
}
// 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
}
func (r *TaskRunner) run() {
// Predeclare things so we an jump to the RESTART
var handleEmpty bool
for {
// Download the task's artifacts
if !r.artifactsDownloaded && len(r.task.Artifacts) > 0 {
r.setState(structs.TaskStatePending, structs.NewTaskEvent(structs.TaskDownloadingArtifacts))
taskDir, ok := r.ctx.AllocDir.TaskDirs[r.task.Name]
if !ok {
err := fmt.Errorf("task directory couldn't be found")
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskDriverFailure).SetDriverError(err))
r.logger.Printf("[ERR] client: task directory for alloc %q task %q couldn't be found", r.alloc.ID, r.task.Name)
r.restartTracker.SetStartError(err)
goto RESTART
}
for _, artifact := range r.task.Artifacts {
if err := getter.GetArtifact(r.taskEnv, artifact, taskDir, r.logger); err != nil {
r.setState(structs.TaskStateDead,
structs.NewTaskEvent(structs.TaskArtifactDownloadFailed).SetDownloadError(err))
r.restartTracker.SetStartError(cstructs.NewRecoverableError(err, true))
goto RESTART
}
}
r.artifactsDownloaded = true
}
// Start the task if not yet started or it is being forced. This logic
// is necessary because in the case of a restore the handle already
// exists.
r.handleLock.Lock()
handleEmpty = r.handle == nil
r.handleLock.Unlock()
if handleEmpty {
startErr := r.startTask()
r.restartTracker.SetStartError(startErr)
if startErr != nil {
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskDriverFailure).SetDriverError(startErr))
goto RESTART
}
}
// Mark the task as started
r.setState(structs.TaskStateRunning, structs.NewTaskEvent(structs.TaskStarted))
// Wait for updates
WAIT:
for {
select {
case waitRes := <-r.handle.WaitCh():
if waitRes == nil {
panic("nil wait")
}
// Log whether the task was successful or not.
r.restartTracker.SetWaitResult(waitRes)
r.setState(structs.TaskStateDead, r.waitErrorToEvent(waitRes))
if !waitRes.Successful() {
r.logger.Printf("[INFO] client: task %q for alloc %q failed: %v", r.task.Name, r.alloc.ID, waitRes)
} else {
r.logger.Printf("[INFO] client: task %q for alloc %q completed successfully", r.task.Name, r.alloc.ID)
}
break WAIT
case update := <-r.updateCh:
if err := r.handleUpdate(update); err != nil {
r.logger.Printf("[ERR] client: update to task %q failed: %v", r.task.Name, err)
}
case <-r.destroyCh:
// Kill the task using an exponential backoff in-case of failures.
destroySuccess, err := r.handleDestroy()
if !destroySuccess {
// We couldn't successfully destroy the resource created.
r.logger.Printf("[ERR] client: failed to kill task %q. Resources may have been leaked: %v", r.task.Name, err)
}
// Store that the task has been destroyed and any associated error.
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskKilled).SetKillError(err))
return
}
}
RESTART:
state, when := r.restartTracker.GetState()
r.restartTracker.SetStartError(nil).SetWaitResult(nil)
reason := r.restartTracker.GetReason()
switch state {
case structs.TaskNotRestarting, structs.TaskTerminated:
r.logger.Printf("[INFO] client: Not restarting task: %v for alloc: %v ", r.task.Name, r.alloc.ID)
if state == structs.TaskNotRestarting {
r.setState(structs.TaskStateDead,
structs.NewTaskEvent(structs.TaskNotRestarting).
SetRestartReason(reason))
}
return
case structs.TaskRestarting:
r.logger.Printf("[INFO] client: Restarting task %q for alloc %q in %v", r.task.Name, r.alloc.ID, when)
r.setState(structs.TaskStatePending,
structs.NewTaskEvent(structs.TaskRestarting).
SetRestartDelay(when).
SetRestartReason(reason))
default:
r.logger.Printf("[ERR] client: restart tracker returned unknown state: %q", state)
return
}
// Sleep but watch for destroy events.
select {
case <-time.After(when):
case <-r.destroyCh:
}
// Destroyed while we were waiting to restart, so abort.
r.destroyLock.Lock()
destroyed := r.destroy
r.destroyLock.Unlock()
if destroyed {
r.logger.Printf("[DEBUG] client: Not restarting task: %v because it's destroyed by user", r.task.Name)
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskKilled))
return
}
// Clear the handle so a new driver will be created.
r.handleLock.Lock()
r.handle = nil
r.handleLock.Unlock()
}
}
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
}
// prestart handles life-cycle tasks that occur before the task has started.
func (r *TaskRunner) prestart(resultCh chan bool) {
if r.task.Vault != nil {
// Wait for the token
r.logger.Printf("[DEBUG] client: waiting for Vault token for task %v in alloc %q", r.task.Name, r.alloc.ID)
tokenCh := r.vaultFuture.Wait()
select {
case <-tokenCh:
case <-r.waitCh:
resultCh <- false
return
}
r.logger.Printf("[DEBUG] client: retrieved Vault token for task %v in alloc %q", r.task.Name, r.alloc.ID)
}
if err := r.setTaskEnv(); err != nil {
r.setState(
structs.TaskStateDead,
structs.NewTaskEvent(structs.TaskSetupFailure).SetSetupError(err).SetFailsTask())
resultCh <- false
return
}
for {
// Download the task's artifacts
if !r.artifactsDownloaded && len(r.task.Artifacts) > 0 {
r.setState(structs.TaskStatePending, structs.NewTaskEvent(structs.TaskDownloadingArtifacts))
for _, artifact := range r.task.Artifacts {
if err := getter.GetArtifact(r.getTaskEnv(), artifact, r.taskDir); err != nil {
wrapped := fmt.Errorf("failed to download artifact %q: %v", artifact.GetterSource, err)
r.setState(structs.TaskStatePending,
structs.NewTaskEvent(structs.TaskArtifactDownloadFailed).SetDownloadError(wrapped))
r.restartTracker.SetStartError(structs.NewRecoverableError(wrapped, true))
goto RESTART
}
}
r.artifactsDownloaded = true
}
// We don't have to wait for any template
if len(r.task.Templates) == 0 {
// Send the start signal
select {
case r.startCh <- struct{}{}:
default:
}
resultCh <- true
return
}
// Build the template manager
if r.templateManager == nil {
var err error
r.templateManager, err = NewTaskTemplateManager(r, r.task.Templates,
r.config, r.vaultFuture.Get(), r.taskDir, r.getTaskEnv())
if err != nil {
err := fmt.Errorf("failed to build task's template manager: %v", err)
r.setState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskSetupFailure).SetSetupError(err).SetFailsTask())
r.logger.Printf("[ERR] client: alloc %q, task %q %v", r.alloc.ID, r.task.Name, err)
resultCh <- false
return
}
}
// Block for consul-template
// TODO Hooks should register themselves as blocking and then we can
// perioidcally enumerate what we are still blocked on
select {
case <-r.unblockCh:
// Send the start signal
select {
case r.startCh <- struct{}{}:
default:
}
resultCh <- true
return
case <-r.waitCh:
// The run loop has exited so exit too
resultCh <- false
return
}
RESTART:
restart := r.shouldRestart()
if !restart {
resultCh <- false
return
}
}
}
func (d *JavaDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
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.
path, err := getter.GetArtifact(
filepath.Join(taskDir, allocdir.TaskLocal),
task.Config["artifact_source"],
task.Config["checksum"],
d.logger,
)
if err != nil {
return nil, err
}
jarName := filepath.Base(path)
// Get the environment variables.
envVars := TaskEnvironmentVariables(ctx, task)
args := []string{}
// Look for jvm options
jvm_options, ok := task.Config["jvm_options"]
if ok && jvm_options != "" {
d.logger.Printf("[DEBUG] driver.java: found JVM options: %s", jvm_options)
args = append(args, jvm_options)
}
// Build the argument list.
args = append(args, "-jar", filepath.Join(allocdir.TaskLocal, jarName))
if argRaw, ok := task.Config["args"]; ok {
args = append(args, argRaw)
}
// Setup the command
// Assumes Java is in the $PATH, but could probably be detected
cmd := executor.Command("java", args...)
// Populate environment variables
cmd.Command().Env = envVars.List()
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)
}
if err := cmd.Start(); err != nil {
return nil, fmt.Errorf("failed to start source: %v", err)
}
// Return a driver handle
h := &javaHandle{
cmd: cmd,
doneCh: make(chan struct{}),
waitCh: make(chan error, 1),
}
go h.run()
return h, nil
}
func (d *JavaDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
var driverConfig JavaDriverConfig
if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
return nil, err
}
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.
path, err := getter.GetArtifact(
taskDir,
driverConfig.ArtifactSource,
driverConfig.Checksum,
d.logger,
)
if err != nil {
return nil, err
}
jarName := filepath.Base(path)
args := []string{}
// Look for jvm options
if len(driverConfig.JvmOpts) != 0 {
d.logger.Printf("[DEBUG] driver.java: found JVM options: %s", driverConfig.JvmOpts)
args = append(args, driverConfig.JvmOpts...)
}
// Build the argument list.
args = append(args, "-jar", jarName)
if len(driverConfig.Args) != 0 {
args = append(args, driverConfig.Args...)
}
bin, err := discover.NomadExecutable()
if err != nil {
return nil, fmt.Errorf("unable to find the nomad binary: %v", err)
}
pluginLogFile := filepath.Join(taskDir, fmt.Sprintf("%s-executor.out", task.Name))
pluginConfig := &plugin.ClientConfig{
Cmd: exec.Command(bin, "executor", pluginLogFile),
}
exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
if err != nil {
return nil, err
}
executorCtx := &executor.ExecutorContext{
TaskEnv: d.taskEnv,
AllocDir: ctx.AllocDir,
TaskName: task.Name,
TaskResources: task.Resources,
FSIsolation: true,
ResourceLimits: true,
UnprivilegedUser: true,
}
ps, err := exec.LaunchCmd(&executor.ExecCommand{Cmd: "java", Args: args}, executorCtx)
if err != nil {
pluginClient.Kill()
return nil, fmt.Errorf("error starting process via the plugin: %v", err)
}
d.logger.Printf("[DEBUG] driver.java: started process with pid: %v", ps.Pid)
// Return a driver handle
h := &javaHandle{
pluginClient: pluginClient,
executor: exec,
userPid: ps.Pid,
isolationConfig: ps.IsolationConfig,
taskDir: taskDir,
allocDir: ctx.AllocDir,
killTimeout: d.DriverContext.KillTimeout(task),
logger: d.logger,
doneCh: make(chan struct{}),
waitCh: make(chan *cstructs.WaitResult, 1),
}
go h.run()
return h, nil
}
func (d *ExecDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
// Get the command to be ran
command, ok := task.Config["command"]
if !ok || command == "" {
return nil, fmt.Errorf("missing command for exec driver")
}
// Create a location to download the artifact.
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)
}
// 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.Command(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
}
// 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) {
// 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),
task.Config["artifact_source"],
task.Config["checksum"],
d.logger,
)
if err != nil {
return nil, err
}
vmID := filepath.Base(vmPath)
// Parse configuration arguments
// Create the base arguments
accelerator := "tcg"
if acc, ok := task.Config["accelerator"]; ok {
accelerator = acc
}
// 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
if len(task.Resources.Networks) > 0 {
// TODO: Consolidate these into map of host/guest port when we have HCL
// Note: Host port must be open and available
// Get and split guest ports. The guest_ports configuration must match up with
// the Reserved ports in the Task Resources
// Users can supply guest_hosts as a list of posts to map on the guest vm.
// These map 1:1 with the requested Reserved Ports from the hostmachine.
ports := strings.Split(task.Config["guest_ports"], ",")
if len(ports) == 0 {
return nil, fmt.Errorf("[ERR] driver.qemu: Error parsing required Guest Ports")
}
// TODO: support more than a single, default Network
if len(ports) != len(task.Resources.Networks[0].ReservedPorts) {
return nil, fmt.Errorf("[ERR] driver.qemu: Error matching Guest Ports with Reserved ports")
}
// Loop through the reserved ports 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
reservedPorts := task.Resources.Networks[0].ReservedPorts
var forwarding string
for i, p := range ports {
forwarding = fmt.Sprintf("%s,hostfwd=tcp::%s-:%s", forwarding, strconv.Itoa(reservedPorts[i]), p)
}
if "" == forwarding {
return nil, fmt.Errorf("[ERR] driver.qemu: Error constructing port forwarding")
}
args = append(args,
"-netdev",
fmt.Sprintf("user,id=user.0%s", 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.Command(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,
doneCh: make(chan struct{}),
waitCh: make(chan error, 1),
}
go h.run()
return h, nil
}