func (daemon *Daemon) checkLocaldns() error {
resolvConf, err := resolvconf.Get()
if err != nil {
return err
}
if len(daemon.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
log.Printf("Local (127.0.0.1) DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v\n", DefaultDns)
daemon.config.Dns = DefaultDns
}
return nil
}
func (runtime *Runtime) checkLocaldns() error {
resolvConf, err := utils.GetResolvConf()
if err != nil {
return err
}
if len(runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
log.Printf("Local (127.0.0.1) DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v\n", DefaultDns)
runtime.config.Dns = DefaultDns
}
return nil
}
func postContainersCreate(srv *Server, version float64, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
config := &Config{}
out := &APIRun{}
if err := json.NewDecoder(r.Body).Decode(config); err != nil {
return err
}
resolvConf, err := utils.GetResolvConf()
if err != nil {
return err
}
if len(config.Dns) == 0 && len(srv.runtime.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
out.Warnings = append(out.Warnings, fmt.Sprintf("Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns))
config.Dns = defaultDns
}
id, err := srv.ContainerCreate(config)
if err != nil {
return err
}
out.ID = id
if config.Memory > 0 && !srv.runtime.capabilities.MemoryLimit {
log.Println("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.")
out.Warnings = append(out.Warnings, "Your kernel does not support memory limit capabilities. Limitation discarded.")
}
if config.Memory > 0 && !srv.runtime.capabilities.SwapLimit {
log.Println("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.")
out.Warnings = append(out.Warnings, "Your kernel does not support memory swap capabilities. Limitation discarded.")
}
if !srv.runtime.capabilities.IPv4Forwarding {
log.Println("Warning: IPv4 forwarding is disabled.")
out.Warnings = append(out.Warnings, "IPv4 forwarding is disabled.")
}
b, err := json.Marshal(out)
if err != nil {
return err
}
w.WriteHeader(http.StatusCreated)
writeJSON(w, b)
return nil
}
func (runtime *Runtime) setupContainerDns(container *Container, config *runconfig.Config) error {
resolvConf, err := utils.GetResolvConf()
if err != nil {
return err
}
if len(config.Dns) == 0 && len(runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
runtime.config.Dns = DefaultDns
}
// If custom dns exists, then create a resolv.conf for the container
if len(config.Dns) > 0 || len(runtime.config.Dns) > 0 || len(config.DnsSearch) > 0 || len(runtime.config.DnsSearch) > 0 {
var (
dns = utils.GetNameservers(resolvConf)
dnsSearch = utils.GetSearchDomains(resolvConf)
)
if len(config.Dns) > 0 {
dns = config.Dns
} else if len(runtime.config.Dns) > 0 {
dns = runtime.config.Dns
}
if len(config.DnsSearch) > 0 {
dnsSearch = config.DnsSearch
} else if len(runtime.config.DnsSearch) > 0 {
dnsSearch = runtime.config.DnsSearch
}
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
f, err := os.Create(container.ResolvConfPath)
if err != nil {
return err
}
defer f.Close()
for _, dns := range dns {
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
return err
}
}
if len(dnsSearch) > 0 {
if _, err := f.Write([]byte("search " + strings.Join(dnsSearch, " ") + "\n")); err != nil {
return err
}
}
} else {
container.ResolvConfPath = "/etc/resolv.conf"
}
return nil
}
func postContainersCreate(srv *Server, version float64, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
if err := parseForm(r); err != nil {
return nil
}
out := &APIRun{}
job := srv.Eng.Job("create", r.Form.Get("name"))
if err := job.DecodeEnv(r.Body); err != nil {
return err
}
resolvConf, err := utils.GetResolvConf()
if err != nil {
return err
}
if !job.GetenvBool("NetworkDisabled") && len(job.Getenv("Dns")) == 0 && len(srv.runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
out.Warnings = append(out.Warnings, fmt.Sprintf("Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns))
job.SetenvList("Dns", defaultDns)
}
// Read container ID from the first line of stdout
job.StdoutParseString(&out.ID)
// Read warnings from stderr
job.StderrParseLines(&out.Warnings, 0)
if err := job.Run(); err != nil {
return err
}
if job.GetenvInt("Memory") > 0 && !srv.runtime.capabilities.MemoryLimit {
log.Println("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.")
out.Warnings = append(out.Warnings, "Your kernel does not support memory limit capabilities. Limitation discarded.")
}
if job.GetenvInt("Memory") > 0 && !srv.runtime.capabilities.SwapLimit {
log.Println("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.")
out.Warnings = append(out.Warnings, "Your kernel does not support memory swap capabilities. Limitation discarded.")
}
if !job.GetenvBool("NetworkDisabled") && srv.runtime.capabilities.IPv4ForwardingDisabled {
log.Println("Warning: IPv4 forwarding is disabled.")
out.Warnings = append(out.Warnings, "IPv4 forwarding is disabled.")
}
return writeJSON(w, http.StatusCreated, out)
}
// Create creates a new container from the given configuration with a given name.
func (runtime *Runtime) Create(config *Config, name string) (*Container, []string, error) {
// Lookup image
img, err := runtime.repositories.LookupImage(config.Image)
if err != nil {
return nil, nil, err
}
checkDeprecatedExpose := func(config *Config) bool {
if config != nil {
if config.PortSpecs != nil {
for _, p := range config.PortSpecs {
if strings.Contains(p, ":") {
return true
}
}
}
}
return false
}
warnings := []string{}
if checkDeprecatedExpose(img.Config) || checkDeprecatedExpose(config) {
warnings = append(warnings, "The mapping to public ports on your host has been deprecated. Use -p to publish the ports.")
}
if img.Config != nil {
if err := MergeConfig(config, img.Config); err != nil {
return nil, nil, err
}
}
if len(config.Entrypoint) != 0 && config.Cmd == nil {
config.Cmd = []string{}
} else if config.Cmd == nil || len(config.Cmd) == 0 {
return nil, nil, fmt.Errorf("No command specified")
}
sysInitPath := utils.DockerInitPath()
if sysInitPath == "" {
return nil, nil, fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See http://docs.docker.io/en/latest/contributing/devenvironment for official build instructions.")
}
// Generate id
id := GenerateID()
if name == "" {
name, err = generateRandomName(runtime)
if err != nil {
name = utils.TruncateID(id)
}
}
if name[0] != '/' {
name = "/" + name
}
// Set the enitity in the graph using the default name specified
if _, err := runtime.containerGraph.Set(name, id); err != nil {
if strings.HasSuffix(err.Error(), "name are not unique") {
return nil, nil, fmt.Errorf("Conflict, %s already exists.", name)
}
return nil, nil, err
}
// Generate default hostname
// FIXME: the lxc template no longer needs to set a default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
var args []string
var entrypoint string
if len(config.Entrypoint) != 0 {
entrypoint = config.Entrypoint[0]
args = append(config.Entrypoint[1:], config.Cmd...)
} else {
entrypoint = config.Cmd[0]
args = config.Cmd[1:]
}
container := &Container{
// FIXME: we should generate the ID here instead of receiving it as an argument
ID: id,
Created: time.Now(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
Image: img.ID, // Always use the resolved image id
NetworkSettings: &NetworkSettings{},
// FIXME: do we need to store this in the container?
SysInitPath: sysInitPath,
Name: name,
}
container.root = runtime.containerRoot(container.ID)
// Step 1: create the container directory.
// This doubles as a barrier to avoid race conditions.
if err := os.Mkdir(container.root, 0700); err != nil {
return nil, nil, err
}
resolvConf, err := utils.GetResolvConf()
if err != nil {
return nil, nil, err
}
if len(config.Dns) == 0 && len(runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
//"WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns
runtime.config.Dns = defaultDns
}
// If custom dns exists, then create a resolv.conf for the container
if len(config.Dns) > 0 || len(runtime.config.Dns) > 0 {
var dns []string
if len(config.Dns) > 0 {
dns = config.Dns
} else {
dns = runtime.config.Dns
}
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
f, err := os.Create(container.ResolvConfPath)
if err != nil {
return nil, nil, err
}
defer f.Close()
for _, dns := range dns {
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
return nil, nil, err
}
}
} else {
container.ResolvConfPath = "/etc/resolv.conf"
}
// Step 2: save the container json
if err := container.ToDisk(); err != nil {
return nil, nil, err
}
// Step 3: if hostname, build hostname and hosts files
container.HostnamePath = path.Join(container.root, "hostname")
ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
hostsContent := []byte(`
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`)
container.HostsPath = path.Join(container.root, "hosts")
if container.Config.Domainname != "" {
hostsContent = append([]byte(fmt.Sprintf("::1\t\t%s.%s %s\n", container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...)
hostsContent = append([]byte(fmt.Sprintf("127.0.0.1\t%s.%s %s\n", container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...)
} else {
hostsContent = append([]byte(fmt.Sprintf("::1\t\t%s\n", container.Config.Hostname)), hostsContent...)
hostsContent = append([]byte(fmt.Sprintf("127.0.0.1\t%s\n", container.Config.Hostname)), hostsContent...)
}
ioutil.WriteFile(container.HostsPath, hostsContent, 0644)
// Step 4: register the container
if err := runtime.Register(container); err != nil {
return nil, nil, err
}
return container, warnings, nil
}
// Create creates a new container from the given configuration with a given name.
func (runtime *Runtime) Create(config *runconfig.Config, name string) (*Container, []string, error) {
// Lookup image
img, err := runtime.repositories.LookupImage(config.Image)
if err != nil {
return nil, nil, err
}
// We add 2 layers to the depth because the container's rw and
// init layer add to the restriction
depth, err := img.Depth()
if err != nil {
return nil, nil, err
}
if depth+2 >= MaxImageDepth {
return nil, nil, fmt.Errorf("Cannot create container with more than %d parents", MaxImageDepth)
}
checkDeprecatedExpose := func(config *runconfig.Config) bool {
if config != nil {
if config.PortSpecs != nil {
for _, p := range config.PortSpecs {
if strings.Contains(p, ":") {
return true
}
}
}
}
return false
}
warnings := []string{}
if checkDeprecatedExpose(img.Config) || checkDeprecatedExpose(config) {
warnings = append(warnings, "The mapping to public ports on your host via Dockerfile EXPOSE (host:port:port) has been deprecated. Use -p to publish the ports.")
}
if img.Config != nil {
if err := runconfig.Merge(config, img.Config); err != nil {
return nil, nil, err
}
}
if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
return nil, nil, fmt.Errorf("No command specified")
}
// Generate id
id := GenerateID()
if name == "" {
name, err = generateRandomName(runtime)
if err != nil {
name = utils.TruncateID(id)
}
} else {
if !validContainerNamePattern.MatchString(name) {
return nil, nil, fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
}
}
if name[0] != '/' {
name = "/" + name
}
// Set the enitity in the graph using the default name specified
if _, err := runtime.containerGraph.Set(name, id); err != nil {
if !graphdb.IsNonUniqueNameError(err) {
return nil, nil, err
}
conflictingContainer, err := runtime.GetByName(name)
if err != nil {
if strings.Contains(err.Error(), "Could not find entity") {
return nil, nil, err
}
// Remove name and continue starting the container
if err := runtime.containerGraph.Delete(name); err != nil {
return nil, nil, err
}
} else {
nameAsKnownByUser := strings.TrimPrefix(name, "/")
return nil, nil, fmt.Errorf(
"Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", nameAsKnownByUser,
utils.TruncateID(conflictingContainer.ID), nameAsKnownByUser)
}
}
// Generate default hostname
// FIXME: the lxc template no longer needs to set a default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
var args []string
var entrypoint string
if len(config.Entrypoint) != 0 {
entrypoint = config.Entrypoint[0]
args = append(config.Entrypoint[1:], config.Cmd...)
} else {
entrypoint = config.Cmd[0]
args = config.Cmd[1:]
}
container := &Container{
// FIXME: we should generate the ID here instead of receiving it as an argument
ID: id,
Created: time.Now().UTC(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
hostConfig: &runconfig.HostConfig{},
Image: img.ID, // Always use the resolved image id
NetworkSettings: &NetworkSettings{},
Name: name,
Driver: runtime.driver.String(),
ExecDriver: runtime.execDriver.Name(),
}
container.root = runtime.containerRoot(container.ID)
// Step 1: create the container directory.
// This doubles as a barrier to avoid race conditions.
if err := os.Mkdir(container.root, 0700); err != nil {
return nil, nil, err
}
initID := fmt.Sprintf("%s-init", container.ID)
if err := runtime.driver.Create(initID, img.ID); err != nil {
return nil, nil, err
}
initPath, err := runtime.driver.Get(initID)
if err != nil {
return nil, nil, err
}
defer runtime.driver.Put(initID)
if err := setupInitLayer(initPath); err != nil {
return nil, nil, err
}
if err := runtime.driver.Create(container.ID, initID); err != nil {
return nil, nil, err
}
resolvConf, err := utils.GetResolvConf()
if err != nil {
return nil, nil, err
}
if len(config.Dns) == 0 && len(runtime.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
//"WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns
runtime.config.Dns = defaultDns
}
// If custom dns exists, then create a resolv.conf for the container
if len(config.Dns) > 0 || len(runtime.config.Dns) > 0 {
var dns []string
if len(config.Dns) > 0 {
dns = config.Dns
} else {
dns = runtime.config.Dns
}
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
f, err := os.Create(container.ResolvConfPath)
if err != nil {
return nil, nil, err
}
defer f.Close()
for _, dns := range dns {
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
return nil, nil, err
}
}
} else {
container.ResolvConfPath = "/etc/resolv.conf"
}
// Step 2: save the container json
if err := container.ToDisk(); err != nil {
return nil, nil, err
}
// Step 3: register the container
if err := runtime.Register(container); err != nil {
return nil, nil, err
}
return container, warnings, nil
}
// Create creates a new container from the given configuration.
func (runtime *Runtime) Create(config *Config) (*Container, error) {
// Lookup image
img, err := runtime.repositories.LookupImage(config.Image)
if err != nil {
return nil, err
}
if img.Config != nil {
MergeConfig(config, img.Config)
}
if len(config.Entrypoint) != 0 && config.Cmd == nil {
config.Cmd = []string{}
} else if config.Cmd == nil || len(config.Cmd) == 0 {
return nil, fmt.Errorf("No command specified")
}
// Generate id
id := GenerateID()
// Generate default hostname
// FIXME: the lxc template no longer needs to set a default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
var args []string
var entrypoint string
if len(config.Entrypoint) != 0 {
entrypoint = config.Entrypoint[0]
args = append(config.Entrypoint[1:], config.Cmd...)
} else {
entrypoint = config.Cmd[0]
args = config.Cmd[1:]
}
container := &Container{
// FIXME: we should generate the ID here instead of receiving it as an argument
ID: id,
Created: time.Now(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
Image: img.ID, // Always use the resolved image id
NetworkSettings: &NetworkSettings{},
// FIXME: do we need to store this in the container?
SysInitPath: sysInitPath,
}
container.root = runtime.containerRoot(container.ID)
// Step 1: create the container directory.
// This doubles as a barrier to avoid race conditions.
if err := os.Mkdir(container.root, 0700); err != nil {
return nil, err
}
resolvConf, err := utils.GetResolvConf()
if err != nil {
return nil, err
}
if len(config.Dns) == 0 && len(runtime.Dns) == 0 && utils.CheckLocalDns(resolvConf) {
//"WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns
runtime.Dns = defaultDns
}
// If custom dns exists, then create a resolv.conf for the container
if len(config.Dns) > 0 || len(runtime.Dns) > 0 {
var dns []string
if len(config.Dns) > 0 {
dns = config.Dns
} else {
dns = runtime.Dns
}
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
f, err := os.Create(container.ResolvConfPath)
if err != nil {
return nil, err
}
defer f.Close()
for _, dns := range dns {
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
return nil, err
}
}
} else {
container.ResolvConfPath = "/etc/resolv.conf"
}
// Step 2: save the container json
if err := container.ToDisk(); err != nil {
return nil, err
}
// Step 3: if hostname, build hostname and hosts files
container.HostnamePath = path.Join(container.root, "hostname")
ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
hostsContent := []byte(`
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
`)
container.HostsPath = path.Join(container.root, "hosts")
if container.Config.Domainname != "" {
hostsContent = append([]byte(fmt.Sprintf("::1\t\t%s.%s %s\n", container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...)
hostsContent = append([]byte(fmt.Sprintf("127.0.0.1\t%s.%s %s\n", container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...)
} else {
hostsContent = append([]byte(fmt.Sprintf("::1\t\t%s\n", container.Config.Hostname)), hostsContent...)
hostsContent = append([]byte(fmt.Sprintf("127.0.0.1\t%s\n", container.Config.Hostname)), hostsContent...)
}
ioutil.WriteFile(container.HostsPath, hostsContent, 0644)
// Step 4: register the container
if err := runtime.Register(container); err != nil {
return nil, err
}
return container, nil
}
func (builder *Builder) Create(config *Config) (*Container, error) {
// Lookup image
img, err := builder.repositories.LookupImage(config.Image)
if err != nil {
return nil, err
}
if img.Config != nil {
MergeConfig(config, img.Config)
}
if config.Cmd == nil || len(config.Cmd) == 0 {
return nil, fmt.Errorf("No command specified")
}
// Generate id
id := GenerateID()
// Generate default hostname
// FIXME: the lxc template no longer needs to set a default hostname
if config.Hostname == "" {
config.Hostname = id[:12]
}
var args []string
var entrypoint string
if len(config.Entrypoint) != 0 {
entrypoint = config.Entrypoint[0]
args = append(config.Entrypoint[1:], config.Cmd...)
} else {
entrypoint = config.Cmd[0]
args = config.Cmd[1:]
}
container := &Container{
// FIXME: we should generate the ID here instead of receiving it as an argument
ID: id,
Created: time.Now(),
Path: entrypoint,
Args: args, //FIXME: de-duplicate from config
Config: config,
Image: img.ID, // Always use the resolved image id
NetworkSettings: &NetworkSettings{},
// FIXME: do we need to store this in the container?
SysInitPath: sysInitPath,
}
container.root = builder.runtime.containerRoot(container.ID)
// Step 1: create the container directory.
// This doubles as a barrier to avoid race conditions.
if err := os.Mkdir(container.root, 0700); err != nil {
return nil, err
}
// create the 'rw' directory in case a container is commited without being started
if err := os.Mkdir(path.Join(container.root, "rw"), 0755); err != nil {
return nil, err
}
if len(config.Dns) == 0 && len(builder.runtime.Dns) == 0 && utils.CheckLocalDns() {
//"WARNING: Docker detected local DNS server on resolv.conf. Using default external servers: %v", defaultDns
builder.runtime.Dns = defaultDns
}
// If custom dns exists, then create a resolv.conf for the container
if len(config.Dns) > 0 || len(builder.runtime.Dns) > 0 {
var dns []string
if len(config.Dns) > 0 {
dns = config.Dns
} else {
dns = builder.runtime.Dns
}
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
f, err := os.Create(container.ResolvConfPath)
if err != nil {
return nil, err
}
defer f.Close()
for _, dns := range dns {
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
return nil, err
}
}
} else {
container.ResolvConfPath = "/etc/resolv.conf"
}
// Step 2: save the container json
if err := container.ToDisk(); err != nil {
return nil, err
}
// Step 3: register the container
if err := builder.runtime.Register(container); err != nil {
return nil, err
}
return container, nil
}