traefik/pkg/provider/docker/config.go

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package docker
import (
"context"
"errors"
"fmt"
"net"
"strings"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
"github.com/containous/traefik/v2/pkg/config/label"
"github.com/containous/traefik/v2/pkg/log"
"github.com/containous/traefik/v2/pkg/provider"
"github.com/containous/traefik/v2/pkg/provider/constraints"
"github.com/docker/go-connections/nat"
)
func (p *Provider) buildConfiguration(ctx context.Context, containersInspected []dockerData) *dynamic.Configuration {
configurations := make(map[string]*dynamic.Configuration)
for _, container := range containersInspected {
containerName := getServiceName(container) + "-" + container.ID
ctxContainer := log.With(ctx, log.Str("container", containerName))
if !p.keepContainer(ctxContainer, container) {
continue
}
logger := log.FromContext(ctxContainer)
confFromLabel, err := label.DecodeConfiguration(container.Labels)
if err != nil {
logger.Error(err)
continue
}
if len(confFromLabel.TCP.Routers) > 0 || len(confFromLabel.TCP.Services) > 0 {
err := p.buildTCPServiceConfiguration(ctxContainer, container, confFromLabel.TCP)
if err != nil {
logger.Error(err)
continue
}
provider.BuildTCPRouterConfiguration(ctxContainer, confFromLabel.TCP)
if len(confFromLabel.HTTP.Routers) == 0 &&
len(confFromLabel.HTTP.Middlewares) == 0 &&
len(confFromLabel.HTTP.Services) == 0 {
configurations[containerName] = confFromLabel
continue
}
}
err = p.buildServiceConfiguration(ctxContainer, container, confFromLabel.HTTP)
if err != nil {
logger.Error(err)
continue
}
serviceName := getServiceName(container)
model := struct {
Name string
Labels map[string]string
}{
Name: serviceName,
Labels: container.Labels,
}
provider.BuildRouterConfiguration(ctx, confFromLabel.HTTP, serviceName, p.defaultRuleTpl, model)
configurations[containerName] = confFromLabel
}
return provider.Merge(ctx, configurations)
}
func (p *Provider) buildTCPServiceConfiguration(ctx context.Context, container dockerData, configuration *dynamic.TCPConfiguration) error {
serviceName := getServiceName(container)
if len(configuration.Services) == 0 {
configuration.Services = make(map[string]*dynamic.TCPService)
lb := &dynamic.TCPServersLoadBalancer{}
lb.SetDefaults()
configuration.Services[serviceName] = &dynamic.TCPService{
LoadBalancer: lb,
}
}
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for name, service := range configuration.Services {
ctxSvc := log.With(ctx, log.Str(log.ServiceName, name))
err := p.addServerTCP(ctxSvc, container, service.LoadBalancer)
if err != nil {
return err
}
}
return nil
}
func (p *Provider) buildServiceConfiguration(ctx context.Context, container dockerData, configuration *dynamic.HTTPConfiguration) error {
serviceName := getServiceName(container)
if len(configuration.Services) == 0 {
configuration.Services = make(map[string]*dynamic.Service)
lb := &dynamic.ServersLoadBalancer{}
lb.SetDefaults()
configuration.Services[serviceName] = &dynamic.Service{
LoadBalancer: lb,
}
}
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for name, service := range configuration.Services {
ctxSvc := log.With(ctx, log.Str(log.ServiceName, name))
err := p.addServer(ctxSvc, container, service.LoadBalancer)
if err != nil {
return err
}
}
return nil
}
func (p *Provider) keepContainer(ctx context.Context, container dockerData) bool {
logger := log.FromContext(ctx)
if !container.ExtraConf.Enable {
logger.Debug("Filtering disabled container")
return false
}
matches, err := constraints.Match(container.Labels, p.Constraints)
if err != nil {
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logger.Errorf("Error matching constraints expression: %v", err)
return false
}
if !matches {
logger.Debugf("Container pruned by constraint expression: %q", p.Constraints)
return false
}
if container.Health != "" && container.Health != "healthy" {
logger.Debug("Filtering unhealthy or starting container")
return false
}
return true
}
func (p *Provider) addServerTCP(ctx context.Context, container dockerData, loadBalancer *dynamic.TCPServersLoadBalancer) error {
serverPort := ""
if loadBalancer != nil && len(loadBalancer.Servers) > 0 {
serverPort = loadBalancer.Servers[0].Port
}
ip, port, err := p.getIPPort(ctx, container, serverPort)
if err != nil {
return err
}
if len(loadBalancer.Servers) == 0 {
server := dynamic.TCPServer{}
loadBalancer.Servers = []dynamic.TCPServer{server}
}
if serverPort != "" {
port = serverPort
loadBalancer.Servers[0].Port = ""
}
if port == "" {
return errors.New("port is missing")
}
loadBalancer.Servers[0].Address = net.JoinHostPort(ip, port)
return nil
}
func (p *Provider) addServer(ctx context.Context, container dockerData, loadBalancer *dynamic.ServersLoadBalancer) error {
serverPort := getLBServerPort(loadBalancer)
ip, port, err := p.getIPPort(ctx, container, serverPort)
if err != nil {
return err
}
if len(loadBalancer.Servers) == 0 {
server := dynamic.Server{}
server.SetDefaults()
loadBalancer.Servers = []dynamic.Server{server}
}
if serverPort != "" {
port = serverPort
loadBalancer.Servers[0].Port = ""
}
if port == "" {
return errors.New("port is missing")
}
loadBalancer.Servers[0].URL = fmt.Sprintf("%s://%s", loadBalancer.Servers[0].Scheme, net.JoinHostPort(ip, port))
loadBalancer.Servers[0].Scheme = ""
return nil
}
func (p *Provider) getIPPort(ctx context.Context, container dockerData, serverPort string) (string, string, error) {
logger := log.FromContext(ctx)
var ip, port string
usedBound := false
if p.UseBindPortIP {
portBinding, err := p.getPortBinding(container, serverPort)
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switch {
case err != nil:
logger.Infof("Unable to find a binding for container %q, falling back on its internal IP/Port.", container.Name)
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case portBinding.HostIP == "0.0.0.0" || len(portBinding.HostIP) == 0:
logger.Infof("Cannot determine the IP address (got %q) for %q's binding, falling back on its internal IP/Port.", portBinding.HostIP, container.Name)
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default:
ip = portBinding.HostIP
port = portBinding.HostPort
usedBound = true
}
}
if !usedBound {
ip = p.getIPAddress(ctx, container)
port = getPort(container, serverPort)
}
if len(ip) == 0 {
return "", "", fmt.Errorf("unable to find the IP address for the container %q: the server is ignored", container.Name)
}
return ip, port, nil
}
func (p Provider) getIPAddress(ctx context.Context, container dockerData) string {
logger := log.FromContext(ctx)
if container.ExtraConf.Docker.Network != "" {
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settings := container.NetworkSettings
if settings.Networks != nil {
network := settings.Networks[container.ExtraConf.Docker.Network]
if network != nil {
return network.Addr
}
logger.Warnf("Could not find network named '%s' for container '%s'! Maybe you're missing the project's prefix in the label? Defaulting to first available network.", container.ExtraConf.Docker.Network, container.Name)
}
}
if container.NetworkSettings.NetworkMode.IsHost() {
if container.Node != nil && container.Node.IPAddress != "" {
return container.Node.IPAddress
}
return "127.0.0.1"
}
if container.NetworkSettings.NetworkMode.IsContainer() {
dockerClient, err := p.createClient()
if err != nil {
logger.Warnf("Unable to get IP address: %s", err)
return ""
}
connectedContainer := container.NetworkSettings.NetworkMode.ConnectedContainer()
containerInspected, err := dockerClient.ContainerInspect(context.Background(), connectedContainer)
if err != nil {
logger.Warnf("Unable to get IP address for container %s : Failed to inspect container ID %s, error: %s", container.Name, connectedContainer, err)
return ""
}
return p.getIPAddress(ctx, parseContainer(containerInspected))
}
for _, network := range container.NetworkSettings.Networks {
return network.Addr
}
logger.Warn("Unable to find the IP address.")
return ""
}
func (p *Provider) getPortBinding(container dockerData, serverPort string) (*nat.PortBinding, error) {
port := getPort(container, serverPort)
for netPort, portBindings := range container.NetworkSettings.Ports {
if strings.EqualFold(string(netPort), port+"/TCP") || strings.EqualFold(string(netPort), port+"/UDP") {
for _, p := range portBindings {
return &p, nil
}
}
}
return nil, fmt.Errorf("unable to find the external IP:Port for the container %q", container.Name)
}
func getLBServerPort(loadBalancer *dynamic.ServersLoadBalancer) string {
if loadBalancer != nil && len(loadBalancer.Servers) > 0 {
return loadBalancer.Servers[0].Port
}
return ""
}
func getPort(container dockerData, serverPort string) string {
if len(serverPort) > 0 {
return serverPort
}
var ports []nat.Port
for port := range container.NetworkSettings.Ports {
ports = append(ports, port)
}
less := func(i, j nat.Port) bool {
return i.Int() < j.Int()
}
nat.Sort(ports, less)
if len(ports) > 0 {
min := ports[0]
return min.Port()
}
return ""
}
func getServiceName(container dockerData) string {
serviceName := container.ServiceName
if values, err := getStringMultipleStrict(container.Labels, labelDockerComposeProject, labelDockerComposeService); err == nil {
serviceName = values[labelDockerComposeService] + "_" + values[labelDockerComposeProject]
}
return serviceName
}