package container
import (
"errors"
"fmt"
"net"
"strconv"
"strings"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
enginecontainer "github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/api/types/filters"
enginemount "github.com/docker/docker/api/types/mount"
"github.com/docker/docker/api/types/network"
volumetypes "github.com/docker/docker/api/types/volume"
clustertypes "github.com/docker/docker/daemon/cluster/provider"
"github.com/docker/docker/reference"
"github.com/docker/go-connections/nat"
"github.com/docker/swarmkit/agent/exec"
"github.com/docker/swarmkit/api"
"github.com/docker/swarmkit/protobuf/ptypes"
"github.com/docker/swarmkit/template"
)
const (
// Explicitly use the kernel's default setting for CPU quota of 100ms.
// https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt
cpuQuotaPeriod = 100 * time.Millisecond
// systemLabelPrefix represents the reserved namespace for system labels.
systemLabelPrefix = "com.docker.swarm"
)
// containerConfig converts task properties into docker container compatible
// components.
type containerConfig struct {
task *api.Task
networksAttachments map[string]*api.NetworkAttachment
}
// newContainerConfig returns a validated container config. No methods should
// return an error if this function returns without error.
func newContainerConfig(t *api.Task) (*containerConfig, error) {
var c containerConfig
return &c, c.setTask(t)
}
func (c *containerConfig) setTask(t *api.Task) error {
if t.Spec.GetContainer() == nil && t.Spec.GetAttachment() == nil {
return exec.ErrRuntimeUnsupported
}
container := t.Spec.GetContainer()
if container != nil {
if container.Image == "" {
return ErrImageRequired
}
if err := validateMounts(container.Mounts); err != nil {
return err
}
}
// index the networks by name
c.networksAttachments = make(map[string]*api.NetworkAttachment, len(t.Networks))
for _, attachment := range t.Networks {
c.networksAttachments[attachment.Network.Spec.Annotations.Name] = attachment
}
c.task = t
if t.Spec.GetContainer() != nil {
preparedSpec, err := template.ExpandContainerSpec(t)
if err != nil {
return err
}
c.task.Spec.Runtime = &api.TaskSpec_Container{
Container: preparedSpec,
}
}
return nil
}
func (c *containerConfig) id() string {
attachment := c.task.Spec.GetAttachment()
if attachment == nil {
return ""
}
return attachment.ContainerID
}
func (c *containerConfig) taskID() string {
return c.task.ID
}
func (c *containerConfig) endpoint() *api.Endpoint {
return c.task.Endpoint
}
func (c *containerConfig) spec() *api.ContainerSpec {
return c.task.Spec.GetContainer()
}
func (c *containerConfig) nameOrID() string {
if c.task.Spec.GetContainer() != nil {
return c.name()
}
return c.id()
}
func (c *containerConfig) name() string {
if c.task.Annotations.Name != "" {
// if set, use the container Annotations.Name field, set in the orchestrator.
return c.task.Annotations.Name
}
slot := fmt.Sprint(c.task.Slot)
if slot == "" || c.task.Slot == 0 {
slot = c.task.NodeID
}
// fallback to service.slot.id.
return fmt.Sprintf("%s.%s.%s", c.task.ServiceAnnotations.Name, slot, c.task.ID)
}
func (c *containerConfig) image() string {
raw := c.spec().Image
ref, err := reference.ParseNamed(raw)
if err != nil {
return raw
}
return reference.WithDefaultTag(ref).String()
}
func (c *containerConfig) portBindings() nat.PortMap {
portBindings := nat.PortMap{}
if c.task.Endpoint == nil {
return portBindings
}
for _, portConfig := range c.task.Endpoint.Ports {
if portConfig.PublishMode != api.PublishModeHost {
continue
}
port := nat.Port(fmt.Sprintf("%d/%s", portConfig.TargetPort, strings.ToLower(portConfig.Protocol.String())))
binding := []nat.PortBinding{
{},
}
if portConfig.PublishedPort != 0 {
binding[0].HostPort = strconv.Itoa(int(portConfig.PublishedPort))
}
portBindings[port] = binding
}
return portBindings
}
func (c *containerConfig) exposedPorts() map[nat.Port]struct{} {
exposedPorts := make(map[nat.Port]struct{})
if c.task.Endpoint == nil {
return exposedPorts
}
for _, portConfig := range c.task.Endpoint.Ports {
if portConfig.PublishMode != api.PublishModeHost {
continue
}
port := nat.Port(fmt.Sprintf("%d/%s", portConfig.TargetPort, strings.ToLower(portConfig.Protocol.String())))
exposedPorts[port] = struct{}{}
}
return exposedPorts
}
func (c *containerConfig) config() *enginecontainer.Config {
config := &enginecontainer.Config{
Labels: c.labels(),
Tty: c.spec().TTY,
OpenStdin: c.spec().OpenStdin,
User: c.spec().User,
Env: c.spec().Env,
Hostname: c.spec().Hostname,
WorkingDir: c.spec().Dir,
Image: c.image(),
ExposedPorts: c.exposedPorts(),
Healthcheck: c.healthcheck(),
}
if len(c.spec().Command) > 0 {
// If Command is provided, we replace the whole invocation with Command
// by replacing Entrypoint and specifying Cmd. Args is ignored in this
// case.
config.Entrypoint = append(config.Entrypoint, c.spec().Command...)
config.Cmd = append(config.Cmd, c.spec().Args...)
} else if len(c.spec().Args) > 0 {
// In this case, we assume the image has an Entrypoint and Args
// specifies the arguments for that entrypoint.
config.Cmd = c.spec().Args
}
return config
}
func (c *containerConfig) labels() map[string]string {
var (
system = map[string]string{
"task": "", // mark as cluster task
"task.id": c.task.ID,
"task.name": c.name(),
"node.id": c.task.NodeID,
"service.id": c.task.ServiceID,
"service.name": c.task.ServiceAnnotations.Name,
}
labels = make(map[string]string)
)
// base labels are those defined in the spec.
for k, v := range c.spec().Labels {
labels[k] = v
}
// we then apply the overrides from the task, which may be set via the
// orchestrator.
for k, v := range c.task.Annotations.Labels {
labels[k] = v
}
// finally, we apply the system labels, which override all labels.
for k, v := range system {
labels[strings.Join([]string{systemLabelPrefix, k}, ".")] = v
}
return labels
}
func (c *containerConfig) mounts() []enginemount.Mount {
var r []enginemount.Mount
for _, mount := range c.spec().Mounts {
r = append(r, convertMount(mount))
}
return r
}
func convertMount(m api.Mount) enginemount.Mount {
mount := enginemount.Mount{
Source: m.Source,
Target: m.Target,
ReadOnly: m.ReadOnly,
}
switch m.Type {
case api.MountTypeBind:
mount.Type = enginemount.TypeBind
case api.MountTypeVolume:
mount.Type = enginemount.TypeVolume
case api.MountTypeTmpfs:
mount.Type = enginemount.TypeTmpfs
}
if m.BindOptions != nil {
mount.BindOptions = &enginemount.BindOptions{}
switch m.BindOptions.Propagation {
case api.MountPropagationRPrivate:
mount.BindOptions.Propagation = enginemount.PropagationRPrivate
case api.MountPropagationPrivate:
mount.BindOptions.Propagation = enginemount.PropagationPrivate
case api.MountPropagationRSlave:
mount.BindOptions.Propagation = enginemount.PropagationRSlave
case api.MountPropagationSlave:
mount.BindOptions.Propagation = enginemount.PropagationSlave
case api.MountPropagationRShared:
mount.BindOptions.Propagation = enginemount.PropagationRShared
case api.MountPropagationShared:
mount.BindOptions.Propagation = enginemount.PropagationShared
}
}
if m.VolumeOptions != nil {
mount.VolumeOptions = &enginemount.VolumeOptions{
NoCopy: m.VolumeOptions.NoCopy,
}
if m.VolumeOptions.Labels != nil {
mount.VolumeOptions.Labels = make(map[string]string, len(m.VolumeOptions.Labels))
for k, v := range m.VolumeOptions.Labels {
mount.VolumeOptions.Labels[k] = v
}
}
if m.VolumeOptions.DriverConfig != nil {
mount.VolumeOptions.DriverConfig = &enginemount.Driver{
Name: m.VolumeOptions.DriverConfig.Name,
}
if m.VolumeOptions.DriverConfig.Options != nil {
mount.VolumeOptions.DriverConfig.Options = make(map[string]string, len(m.VolumeOptions.DriverConfig.Options))
for k, v := range m.VolumeOptions.DriverConfig.Options {
mount.VolumeOptions.DriverConfig.Options[k] = v
}
}
}
}
if m.TmpfsOptions != nil {
mount.TmpfsOptions = &enginemount.TmpfsOptions{
SizeBytes: m.TmpfsOptions.SizeBytes,
Mode: m.TmpfsOptions.Mode,
}
}
return mount
}
func (c *containerConfig) healthcheck() *enginecontainer.HealthConfig {
hcSpec := c.spec().Healthcheck
if hcSpec == nil {
return nil
}
interval, _ := ptypes.Duration(hcSpec.Interval)
timeout, _ := ptypes.Duration(hcSpec.Timeout)
return &enginecontainer.HealthConfig{
Test: hcSpec.Test,
Interval: interval,
Timeout: timeout,
Retries: int(hcSpec.Retries),
}
}
func (c *containerConfig) hostConfig() *enginecontainer.HostConfig {
hc := &enginecontainer.HostConfig{
Resources: c.resources(),
GroupAdd: c.spec().Groups,
PortBindings: c.portBindings(),
Mounts: c.mounts(),
}
if c.spec().DNSConfig != nil {
hc.DNS = c.spec().DNSConfig.Nameservers
hc.DNSSearch = c.spec().DNSConfig.Search
hc.DNSOptions = c.spec().DNSConfig.Options
}
// The format of extra hosts on swarmkit is specified in:
// http://man7.org/linux/man-pages/man5/hosts.5.html
// IP_address canonical_hostname [aliases...]
// However, the format of ExtraHosts in HostConfig is
// <host>:<ip>
// We need to do the conversion here
// (Alias is ignored for now)
for _, entry := range c.spec().Hosts {
parts := strings.Fields(entry)
if len(parts) > 1 {
hc.ExtraHosts = append(hc.ExtraHosts, fmt.Sprintf("%s:%s", parts[1], parts[0]))
}
}
if c.task.LogDriver != nil {
hc.LogConfig = enginecontainer.LogConfig{
Type: c.task.LogDriver.Name,
Config: c.task.LogDriver.Options,
}
}
return hc
}
// This handles the case of volumes that are defined inside a service Mount
func (c *containerConfig) volumeCreateRequest(mount *api.Mount) *volumetypes.VolumesCreateBody {
var (
driverName string
driverOpts map[string]string
labels map[string]string
)
if mount.VolumeOptions != nil && mount.VolumeOptions.DriverConfig != nil {
driverName = mount.VolumeOptions.DriverConfig.Name
driverOpts = mount.VolumeOptions.DriverConfig.Options
labels = mount.VolumeOptions.Labels
}
if mount.VolumeOptions != nil {
return &volumetypes.VolumesCreateBody{
Name: mount.Source,
Driver: driverName,
DriverOpts: driverOpts,
Labels: labels,
}
}
return nil
}
func (c *containerConfig) resources() enginecontainer.Resources {
resources := enginecontainer.Resources{}
// If no limits are specified let the engine use its defaults.
//
// TODO(aluzzardi): We might want to set some limits anyway otherwise
// "unlimited" tasks will step over the reservation of other tasks.
r := c.task.Spec.Resources
if r == nil || r.Limits == nil {
return resources
}
if r.Limits.MemoryBytes > 0 {
resources.Memory = r.Limits.MemoryBytes
}
if r.Limits.NanoCPUs > 0 {
// CPU Period must be set in microseconds.
resources.CPUPeriod = int64(cpuQuotaPeriod / time.Microsecond)
resources.CPUQuota = r.Limits.NanoCPUs * resources.CPUPeriod / 1e9
}
return resources
}
// Docker daemon supports just 1 network during container create.
func (c *containerConfig) createNetworkingConfig() *network.NetworkingConfig {
var networks []*api.NetworkAttachment
if c.task.Spec.GetContainer() != nil || c.task.Spec.GetAttachment() != nil {
networks = c.task.Networks
}
epConfig := make(map[string]*network.EndpointSettings)
if len(networks) > 0 {
epConfig[networks[0].Network.Spec.Annotations.Name] = getEndpointConfig(networks[0])
}
return &network.NetworkingConfig{EndpointsConfig: epConfig}
}
// TODO: Merge this function with createNetworkingConfig after daemon supports multiple networks in container create
func (c *containerConfig) connectNetworkingConfig() *network.NetworkingConfig {
var networks []*api.NetworkAttachment
if c.task.Spec.GetContainer() != nil {
networks = c.task.Networks
}
// First network is used during container create. Other networks are used in "docker network connect"
if len(networks) < 2 {
return nil
}
epConfig := make(map[string]*network.EndpointSettings)
for _, na := range networks[1:] {
epConfig[na.Network.Spec.Annotations.Name] = getEndpointConfig(na)
}
return &network.NetworkingConfig{EndpointsConfig: epConfig}
}
func getEndpointConfig(na *api.NetworkAttachment) *network.EndpointSettings {
var ipv4, ipv6 string
for _, addr := range na.Addresses {
ip, _, err := net.ParseCIDR(addr)
if err != nil {
continue
}
if ip.To4() != nil {
ipv4 = ip.String()
continue
}
if ip.To16() != nil {
ipv6 = ip.String()
}
}
return &network.EndpointSettings{
NetworkID: na.Network.ID,
IPAMConfig: &network.EndpointIPAMConfig{
IPv4Address: ipv4,
IPv6Address: ipv6,
},
}
}
func (c *containerConfig) virtualIP(networkID string) string {
if c.task.Endpoint == nil {
return ""
}
for _, eVip := range c.task.Endpoint.VirtualIPs {
// We only support IPv4 VIPs for now.
if eVip.NetworkID == networkID {
vip, _, err := net.ParseCIDR(eVip.Addr)
if err != nil {
return ""
}
return vip.String()
}
}
return ""
}
func (c *containerConfig) serviceConfig() *clustertypes.ServiceConfig {
if len(c.task.Networks) == 0 {
return nil
}
logrus.Debugf("Creating service config in agent for t = %+v", c.task)
svcCfg := &clustertypes.ServiceConfig{
Name: c.task.ServiceAnnotations.Name,
Aliases: make(map[string][]string),
ID: c.task.ServiceID,
VirtualAddresses: make(map[string]*clustertypes.VirtualAddress),
}
for _, na := range c.task.Networks {
svcCfg.VirtualAddresses[na.Network.ID] = &clustertypes.VirtualAddress{
// We support only IPv4 virtual IP for now.
IPv4: c.virtualIP(na.Network.ID),
}
if len(na.Aliases) > 0 {
svcCfg.Aliases[na.Network.ID] = na.Aliases
}
}
if c.task.Endpoint != nil {
for _, ePort := range c.task.Endpoint.Ports {
if ePort.PublishMode != api.PublishModeIngress {
continue
}
svcCfg.ExposedPorts = append(svcCfg.ExposedPorts, &clustertypes.PortConfig{
Name: ePort.Name,
Protocol: int32(ePort.Protocol),
TargetPort: ePort.TargetPort,
PublishedPort: ePort.PublishedPort,
})
}
}
return svcCfg
}
// networks returns a list of network names attached to the container. The
// returned name can be used to lookup the corresponding network create
// options.
func (c *containerConfig) networks() []string {
var networks []string
for name := range c.networksAttachments {
networks = append(networks, name)
}
return networks
}
func (c *containerConfig) networkCreateRequest(name string) (clustertypes.NetworkCreateRequest, error) {
na, ok := c.networksAttachments[name]
if !ok {
return clustertypes.NetworkCreateRequest{}, errors.New("container: unknown network referenced")
}
options := types.NetworkCreate{
// ID: na.Network.ID,
Driver: na.Network.DriverState.Name,
IPAM: &network.IPAM{
Driver: na.Network.IPAM.Driver.Name,
},
Options: na.Network.DriverState.Options,
Labels: na.Network.Spec.Annotations.Labels,
Internal: na.Network.Spec.Internal,
EnableIPv6: na.Network.Spec.Ipv6Enabled,
CheckDuplicate: true,
}
for _, ic := range na.Network.IPAM.Configs {
c := network.IPAMConfig{
Subnet: ic.Subnet,
IPRange: ic.Range,
Gateway: ic.Gateway,
}
options.IPAM.Config = append(options.IPAM.Config, c)
}
return clustertypes.NetworkCreateRequest{
ID: na.Network.ID,
NetworkCreateRequest: types.NetworkCreateRequest{
Name: name,
NetworkCreate: options,
},
}, nil
}
func (c containerConfig) eventFilter() filters.Args {
filter := filters.NewArgs()
filter.Add("type", events.ContainerEventType)
filter.Add("name", c.name())
filter.Add("label", fmt.Sprintf("%v.task.id=%v", systemLabelPrefix, c.task.ID))
return filter
}