// IP returns the IP address of the Docker machine
func IP(name string) (string, error) {
output, _, err := localcmd.New(dockerMachineBinary()).Args("ip", name).Output()
if err != nil {
return "", ErrDockerMachineExec("ip", err)
}
return strings.TrimSpace(output), nil
}
// Start starts up an existing Docker machine
func Start(name string) error {
err := localcmd.New(dockerMachineBinary()).Args("start", name).Run()
if err != nil {
return ErrDockerMachineExec("start", err)
}
return nil
}
// determineMachineProcs determines a reasonable default for machine processors
// TODO: implement linux & windows
func determineMachineProcessors() int {
if runtime.GOOS == "darwin" {
output, _, err := localcmd.New("sysctl").Args("-n", "hw.ncpus").Output()
if err == nil {
ncpus, aerr := strconv.Atoi(strings.TrimSpace(output))
if aerr == nil {
return ncpus // use all cpus
}
}
}
return defaultMachineProcessors
}
// determineMachineMemory determines a reasonable default for machine memory
// TODO: implement linux & windows
func determineMachineMemory() int {
if runtime.GOOS == "darwin" {
output, _, err := localcmd.New("sysctl").Args("-n", "hw.memsize").Output()
if err == nil {
mem, perr := strconv.ParseInt(strings.TrimSpace(output), 10, 64)
if perr == nil {
return int(mem / (1024 * 1024 * 2)) // half of available megs
}
}
}
return defaultMachineMemory
}
// Client returns a Docker client for the given Docker machine
func Client(name string) (*docker.Client, error) {
output, _, err := localcmd.New(dockerMachineBinary()).Args("env", name).Output()
if err != nil {
return nil, ErrDockerMachineExec("env", err)
}
scanner := bufio.NewScanner(bytes.NewBufferString(output))
var (
dockerHost, certPath string
tlsVerify bool
)
prefix := "export "
if runtime.GOOS == "windows" {
prefix = "SET "
}
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, prefix) {
line = strings.TrimPrefix(line, prefix)
parts := strings.SplitN(line, "=", 2)
if len(parts) != 2 {
continue
}
switch strings.ToUpper(parts[0]) {
case "DOCKER_HOST":
dockerHost = strings.Trim(parts[1], "\"")
case "DOCKER_CERT_PATH":
certPath = strings.Trim(parts[1], "\"")
case "DOCKER_TLS_VERIFY":
tlsVerify = len(parts[1]) > 0
}
}
}
var client *docker.Client
if tlsVerify {
cert := filepath.Join(certPath, "cert.pem")
key := filepath.Join(certPath, "key.pem")
ca := filepath.Join(certPath, "ca.pem")
client, err = docker.NewVersionedTLSClient(dockerHost, cert, key, ca, "")
} else {
client, err = docker.NewVersionedClient(dockerHost, "")
}
if err != nil {
return nil, errors.NewError("could not get Docker client for machine %s", name).WithCause(err)
}
client.SkipServerVersionCheck = true
return client, nil
}
// Create creates a new Docker machine
func (b *Builder) Create() error {
if Exists(b.name) {
return ErrDockerMachineExists
}
if IsAvailable() {
return ErrDockerMachineNotAvailable
}
mem := b.memory
if mem == 0 {
mem = determineMachineMemory()
}
proc := b.processors
if proc == 0 {
proc = determineMachineProcessors()
}
return localcmd.New(dockerMachineBinary()).Args(
"create",
"--driver", "virtualbox",
"--virtualbox-cpu-count", strconv.Itoa(proc),
"--virtualbox-memory", strconv.Itoa(mem),
"--engine-insecure-registry", "172.30.0.0/16",
b.name).Run()
}
// Exists returns true if a Docker machine exists
func Exists(name string) bool {
err := localcmd.New(dockerMachineBinary()).Args("inspect", name).Run()
return err == nil
}
// IsRunning returns true if a Docker machine is running
func IsRunning(name string) bool {
err := localcmd.New(dockerMachineBinary()).Args("ip", name).Run()
return err == nil
}
// Client returns a Docker client for the given Docker machine
func Client(name string) (*docker.Client, *dockerclient.Client, error) {
output, _, err := localcmd.New(dockerMachineBinary()).Args("env", name).Output()
if err != nil {
return nil, nil, ErrDockerMachineExec("env", err)
}
scanner := bufio.NewScanner(bytes.NewBufferString(output))
var (
dockerHost, certPath string
tlsVerify bool
)
prefix := "export "
if runtime.GOOS == "windows" {
prefix = "SET "
}
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, prefix) {
line = strings.TrimPrefix(line, prefix)
parts := strings.SplitN(line, "=", 2)
if len(parts) != 2 {
continue
}
switch strings.ToUpper(parts[0]) {
case "DOCKER_HOST":
dockerHost = strings.Trim(parts[1], "\"")
case "DOCKER_CERT_PATH":
certPath = strings.Trim(parts[1], "\"")
case "DOCKER_TLS_VERIFY":
tlsVerify = len(parts[1]) > 0
}
}
}
var client *docker.Client
if len(certPath) > 0 {
cert := filepath.Join(certPath, "cert.pem")
key := filepath.Join(certPath, "key.pem")
ca := filepath.Join(certPath, "ca.pem")
client, err = docker.NewVersionedTLSClient(dockerHost, cert, key, ca, "")
} else {
client, err = docker.NewVersionedClient(dockerHost, "")
}
if err != nil {
return nil, nil, errors.NewError("could not get Docker client for machine %s", name).WithCause(err)
}
client.SkipServerVersionCheck = true
var httpClient *http.Client
if len(certPath) > 0 {
tlscOptions := tlsconfig.Options{
CAFile: filepath.Join(certPath, "ca.pem"),
CertFile: filepath.Join(certPath, "cert.pem"),
KeyFile: filepath.Join(certPath, "key.pem"),
InsecureSkipVerify: !tlsVerify,
}
tlsc, tlsErr := tlsconfig.Client(tlscOptions)
if tlsErr != nil {
return nil, nil, errors.NewError("could not create TLS config client for machine %s", name).WithCause(tlsErr)
}
httpClient = &http.Client{
Transport: net.SetTransportDefaults(&http.Transport{
TLSClientConfig: tlsc,
}),
}
}
engineAPIClient, err := dockerclient.NewClient(dockerHost, "", httpClient, nil)
if err != nil {
return nil, nil, errors.NewError("cannot create Docker engine API client").WithCause(err)
}
return client, engineAPIClient, nil
}