600 lines
20 KiB
Go
600 lines
20 KiB
Go
package docker
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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"strconv"
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"strings"
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"text/template"
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"time"
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"github.com/cenkalti/backoff/v4"
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"github.com/docker/cli/cli/connhelper"
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dockertypes "github.com/docker/docker/api/types"
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dockercontainertypes "github.com/docker/docker/api/types/container"
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eventtypes "github.com/docker/docker/api/types/events"
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"github.com/docker/docker/api/types/filters"
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swarmtypes "github.com/docker/docker/api/types/swarm"
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"github.com/docker/docker/api/types/versions"
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"github.com/docker/docker/client"
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"github.com/docker/go-connections/nat"
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"github.com/docker/go-connections/sockets"
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ptypes "github.com/traefik/paerser/types"
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"github.com/traefik/traefik/v2/pkg/config/dynamic"
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"github.com/traefik/traefik/v2/pkg/job"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/provider"
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"github.com/traefik/traefik/v2/pkg/safe"
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"github.com/traefik/traefik/v2/pkg/types"
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"github.com/traefik/traefik/v2/pkg/version"
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)
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const (
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// DockerAPIVersion is a constant holding the version of the Provider API traefik will use.
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DockerAPIVersion = "1.24"
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// SwarmAPIVersion is a constant holding the version of the Provider API traefik will use.
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SwarmAPIVersion = "1.24"
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)
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// DefaultTemplateRule The default template for the default rule.
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const DefaultTemplateRule = "Host(`{{ normalize .Name }}`)"
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var _ provider.Provider = (*Provider)(nil)
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// Provider holds configurations of the provider.
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type Provider struct {
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Constraints string `description:"Constraints is an expression that Traefik matches against the container's labels to determine whether to create any route for that container." json:"constraints,omitempty" toml:"constraints,omitempty" yaml:"constraints,omitempty" export:"true"`
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Watch bool `description:"Watch Docker Swarm events." json:"watch,omitempty" toml:"watch,omitempty" yaml:"watch,omitempty" export:"true"`
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Endpoint string `description:"Docker server endpoint. Can be a tcp or a unix socket endpoint." json:"endpoint,omitempty" toml:"endpoint,omitempty" yaml:"endpoint,omitempty"`
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DefaultRule string `description:"Default rule." json:"defaultRule,omitempty" toml:"defaultRule,omitempty" yaml:"defaultRule,omitempty"`
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TLS *types.ClientTLS `description:"Enable Docker TLS support." json:"tls,omitempty" toml:"tls,omitempty" yaml:"tls,omitempty" export:"true"`
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ExposedByDefault bool `description:"Expose containers by default." json:"exposedByDefault,omitempty" toml:"exposedByDefault,omitempty" yaml:"exposedByDefault,omitempty" export:"true"`
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UseBindPortIP bool `description:"Use the ip address from the bound port, rather than from the inner network." json:"useBindPortIP,omitempty" toml:"useBindPortIP,omitempty" yaml:"useBindPortIP,omitempty" export:"true"`
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SwarmMode bool `description:"Use Docker on Swarm Mode." json:"swarmMode,omitempty" toml:"swarmMode,omitempty" yaml:"swarmMode,omitempty" export:"true"`
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Network string `description:"Default Docker network used." json:"network,omitempty" toml:"network,omitempty" yaml:"network,omitempty" export:"true"`
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SwarmModeRefreshSeconds ptypes.Duration `description:"Polling interval for swarm mode." json:"swarmModeRefreshSeconds,omitempty" toml:"swarmModeRefreshSeconds,omitempty" yaml:"swarmModeRefreshSeconds,omitempty" export:"true"`
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HTTPClientTimeout ptypes.Duration `description:"Client timeout for HTTP connections." json:"httpClientTimeout,omitempty" toml:"httpClientTimeout,omitempty" yaml:"httpClientTimeout,omitempty" export:"true"`
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AllowEmptyServices bool `description:"Disregards the Docker containers health checks with respect to the creation or removal of the corresponding services." json:"allowEmptyServices,omitempty" toml:"allowEmptyServices,omitempty" yaml:"allowEmptyServices,omitempty" export:"true"`
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defaultRuleTpl *template.Template
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}
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// SetDefaults sets the default values.
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func (p *Provider) SetDefaults() {
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p.Watch = true
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p.ExposedByDefault = true
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p.Endpoint = "unix:///var/run/docker.sock"
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p.SwarmMode = false
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p.SwarmModeRefreshSeconds = ptypes.Duration(15 * time.Second)
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p.DefaultRule = DefaultTemplateRule
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}
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// Init the provider.
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func (p *Provider) Init() error {
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defaultRuleTpl, err := provider.MakeDefaultRuleTemplate(p.DefaultRule, nil)
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if err != nil {
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return fmt.Errorf("error while parsing default rule: %w", err)
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}
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p.defaultRuleTpl = defaultRuleTpl
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return nil
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}
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// dockerData holds the need data to the provider.
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type dockerData struct {
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ID string
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ServiceName string
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Name string
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Labels map[string]string // List of labels set to container or service
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NetworkSettings networkSettings
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Health string
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Node *dockertypes.ContainerNode
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ExtraConf configuration
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}
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// NetworkSettings holds the networks data to the provider.
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type networkSettings struct {
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NetworkMode dockercontainertypes.NetworkMode
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Ports nat.PortMap
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Networks map[string]*networkData
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}
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// Network holds the network data to the provider.
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type networkData struct {
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Name string
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Addr string
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Port int
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Protocol string
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ID string
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}
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func (p *Provider) createClient() (client.APIClient, error) {
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opts, err := p.getClientOpts()
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if err != nil {
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return nil, err
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}
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httpHeaders := map[string]string{
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"User-Agent": "Traefik " + version.Version,
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}
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opts = append(opts, client.WithHTTPHeaders(httpHeaders))
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apiVersion := DockerAPIVersion
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if p.SwarmMode {
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apiVersion = SwarmAPIVersion
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}
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opts = append(opts, client.WithVersion(apiVersion))
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return client.NewClientWithOpts(opts...)
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}
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func (p *Provider) getClientOpts() ([]client.Opt, error) {
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helper, err := connhelper.GetConnectionHelper(p.Endpoint)
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if err != nil {
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return nil, err
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}
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// SSH
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if helper != nil {
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// https://github.com/docker/cli/blob/ebca1413117a3fcb81c89d6be226dcec74e5289f/cli/context/docker/load.go#L112-L123
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httpClient := &http.Client{
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Transport: &http.Transport{
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DialContext: helper.Dialer,
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},
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}
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return []client.Opt{
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client.WithHTTPClient(httpClient),
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client.WithTimeout(time.Duration(p.HTTPClientTimeout)),
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client.WithHost(helper.Host), // To avoid 400 Bad Request: malformed Host header daemon error
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client.WithDialContext(helper.Dialer),
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}, nil
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}
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opts := []client.Opt{
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client.WithHost(p.Endpoint),
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client.WithTimeout(time.Duration(p.HTTPClientTimeout)),
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}
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if p.TLS != nil {
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ctx := log.With(context.Background(), log.Str(log.ProviderName, "docker"))
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conf, err := p.TLS.CreateTLSConfig(ctx)
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if err != nil {
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return nil, fmt.Errorf("unable to create client TLS configuration: %w", err)
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}
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hostURL, err := client.ParseHostURL(p.Endpoint)
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if err != nil {
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return nil, err
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}
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tr := &http.Transport{
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TLSClientConfig: conf,
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}
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if err := sockets.ConfigureTransport(tr, hostURL.Scheme, hostURL.Host); err != nil {
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return nil, err
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}
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opts = append(opts, client.WithHTTPClient(&http.Client{Transport: tr, Timeout: time.Duration(p.HTTPClientTimeout)}))
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}
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return opts, nil
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}
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// Provide allows the docker provider to provide configurations to traefik using the given configuration channel.
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func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error {
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pool.GoCtx(func(routineCtx context.Context) {
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ctxLog := log.With(routineCtx, log.Str(log.ProviderName, "docker"))
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logger := log.FromContext(ctxLog)
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operation := func() error {
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var err error
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ctx, cancel := context.WithCancel(ctxLog)
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defer cancel()
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ctx = log.With(ctx, log.Str(log.ProviderName, "docker"))
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dockerClient, err := p.createClient()
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if err != nil {
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logger.Errorf("Failed to create a client for docker, error: %s", err)
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return err
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}
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defer dockerClient.Close()
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serverVersion, err := dockerClient.ServerVersion(ctx)
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if err != nil {
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logger.Errorf("Failed to retrieve information of the docker client and server host: %s", err)
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return err
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}
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logger.Debugf("Provider connection established with docker %s (API %s)", serverVersion.Version, serverVersion.APIVersion)
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var dockerDataList []dockerData
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if p.SwarmMode {
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dockerDataList, err = p.listServices(ctx, dockerClient)
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if err != nil {
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logger.Errorf("Failed to list services for docker swarm mode, error %s", err)
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return err
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}
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} else {
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dockerDataList, err = p.listContainers(ctx, dockerClient)
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if err != nil {
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logger.Errorf("Failed to list containers for docker, error %s", err)
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return err
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}
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}
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configuration := p.buildConfiguration(ctxLog, dockerDataList)
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configurationChan <- dynamic.Message{
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ProviderName: "docker",
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Configuration: configuration,
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}
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if p.Watch {
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if p.SwarmMode {
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errChan := make(chan error)
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// TODO: This need to be change. Linked to Swarm events docker/docker#23827
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ticker := time.NewTicker(time.Duration(p.SwarmModeRefreshSeconds))
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pool.GoCtx(func(ctx context.Context) {
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ctx = log.With(ctx, log.Str(log.ProviderName, "docker"))
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logger := log.FromContext(ctx)
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defer close(errChan)
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for {
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select {
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case <-ticker.C:
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services, err := p.listServices(ctx, dockerClient)
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if err != nil {
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logger.Errorf("Failed to list services for docker swarm mode, error %s", err)
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errChan <- err
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return
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}
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configuration := p.buildConfiguration(ctx, services)
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if configuration != nil {
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configurationChan <- dynamic.Message{
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ProviderName: "docker",
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Configuration: configuration,
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}
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}
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case <-ctx.Done():
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ticker.Stop()
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return
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}
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}
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})
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if err, ok := <-errChan; ok {
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return err
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}
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// channel closed
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} else {
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f := filters.NewArgs()
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f.Add("type", "container")
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options := dockertypes.EventsOptions{
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Filters: f,
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}
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startStopHandle := func(m eventtypes.Message) {
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logger.Debugf("Provider event received %+v", m)
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containers, err := p.listContainers(ctx, dockerClient)
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if err != nil {
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logger.Errorf("Failed to list containers for docker, error %s", err)
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// Call cancel to get out of the monitor
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return
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}
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configuration := p.buildConfiguration(ctx, containers)
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if configuration != nil {
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message := dynamic.Message{
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ProviderName: "docker",
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Configuration: configuration,
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}
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select {
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case configurationChan <- message:
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case <-ctx.Done():
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}
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}
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}
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eventsc, errc := dockerClient.Events(ctx, options)
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for {
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select {
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case event := <-eventsc:
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if event.Action == "start" ||
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event.Action == "die" ||
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strings.HasPrefix(event.Action, "health_status") {
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startStopHandle(event)
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}
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case err := <-errc:
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if errors.Is(err, io.EOF) {
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logger.Debug("Provider event stream closed")
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}
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return err
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case <-ctx.Done():
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return nil
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}
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}
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}
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}
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return nil
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}
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notify := func(err error, time time.Duration) {
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logger.Errorf("Provider connection error %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), backoff.WithContext(job.NewBackOff(backoff.NewExponentialBackOff()), ctxLog), notify)
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if err != nil {
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logger.Errorf("Cannot connect to docker server %+v", err)
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}
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})
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return nil
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}
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func (p *Provider) listContainers(ctx context.Context, dockerClient client.ContainerAPIClient) ([]dockerData, error) {
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containerList, err := dockerClient.ContainerList(ctx, dockertypes.ContainerListOptions{})
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if err != nil {
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return nil, err
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}
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var inspectedContainers []dockerData
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// get inspect containers
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for _, container := range containerList {
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dData := inspectContainers(ctx, dockerClient, container.ID)
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if len(dData.Name) == 0 {
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continue
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}
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extraConf, err := p.getConfiguration(dData)
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if err != nil {
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log.FromContext(ctx).Errorf("Skip container %s: %v", getServiceName(dData), err)
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continue
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}
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dData.ExtraConf = extraConf
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inspectedContainers = append(inspectedContainers, dData)
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}
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return inspectedContainers, nil
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}
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func inspectContainers(ctx context.Context, dockerClient client.ContainerAPIClient, containerID string) dockerData {
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containerInspected, err := dockerClient.ContainerInspect(ctx, containerID)
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if err != nil {
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log.FromContext(ctx).Warnf("Failed to inspect container %s, error: %s", containerID, err)
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return dockerData{}
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}
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// This condition is here to avoid to have empty IP https://github.com/traefik/traefik/issues/2459
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// We register only container which are running
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if containerInspected.ContainerJSONBase != nil && containerInspected.ContainerJSONBase.State != nil && containerInspected.ContainerJSONBase.State.Running {
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return parseContainer(containerInspected)
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}
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return dockerData{}
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}
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func parseContainer(container dockertypes.ContainerJSON) dockerData {
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dData := dockerData{
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NetworkSettings: networkSettings{},
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}
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if container.ContainerJSONBase != nil {
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dData.ID = container.ContainerJSONBase.ID
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dData.Name = container.ContainerJSONBase.Name
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dData.ServiceName = dData.Name // Default ServiceName to be the container's Name.
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dData.Node = container.ContainerJSONBase.Node
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if container.ContainerJSONBase.HostConfig != nil {
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dData.NetworkSettings.NetworkMode = container.ContainerJSONBase.HostConfig.NetworkMode
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}
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if container.State != nil && container.State.Health != nil {
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dData.Health = container.State.Health.Status
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}
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}
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if container.Config != nil && container.Config.Labels != nil {
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dData.Labels = container.Config.Labels
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}
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if container.NetworkSettings != nil {
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if container.NetworkSettings.Ports != nil {
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dData.NetworkSettings.Ports = container.NetworkSettings.Ports
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}
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if container.NetworkSettings.Networks != nil {
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dData.NetworkSettings.Networks = make(map[string]*networkData)
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for name, containerNetwork := range container.NetworkSettings.Networks {
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addr := containerNetwork.IPAddress
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if addr == "" {
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addr = containerNetwork.GlobalIPv6Address
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}
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dData.NetworkSettings.Networks[name] = &networkData{
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ID: containerNetwork.NetworkID,
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Name: name,
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Addr: addr,
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}
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}
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}
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}
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return dData
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}
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func (p *Provider) listServices(ctx context.Context, dockerClient client.APIClient) ([]dockerData, error) {
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logger := log.FromContext(ctx)
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serviceList, err := dockerClient.ServiceList(ctx, dockertypes.ServiceListOptions{})
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if err != nil {
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return nil, err
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}
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serverVersion, err := dockerClient.ServerVersion(ctx)
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if err != nil {
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return nil, err
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}
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networkListArgs := filters.NewArgs()
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// https://docs.docker.com/engine/api/v1.29/#tag/Network (Docker 17.06)
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if versions.GreaterThanOrEqualTo(serverVersion.APIVersion, "1.29") {
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networkListArgs.Add("scope", "swarm")
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} else {
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networkListArgs.Add("driver", "overlay")
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}
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networkList, err := dockerClient.NetworkList(ctx, dockertypes.NetworkListOptions{Filters: networkListArgs})
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if err != nil {
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logger.Debugf("Failed to network inspect on client for docker, error: %s", err)
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return nil, err
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}
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networkMap := make(map[string]*dockertypes.NetworkResource)
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for _, network := range networkList {
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networkToAdd := network
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networkMap[network.ID] = &networkToAdd
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}
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var dockerDataList []dockerData
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var dockerDataListTasks []dockerData
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for _, service := range serviceList {
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dData, err := p.parseService(ctx, service, networkMap)
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if err != nil {
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logger.Errorf("Skip container %s: %v", getServiceName(dData), err)
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continue
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}
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if dData.ExtraConf.Docker.LBSwarm {
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if len(dData.NetworkSettings.Networks) > 0 {
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dockerDataList = append(dockerDataList, dData)
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}
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} else {
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isGlobalSvc := service.Spec.Mode.Global != nil
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dockerDataListTasks, err = listTasks(ctx, dockerClient, service.ID, dData, networkMap, isGlobalSvc)
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if err != nil {
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logger.Warn(err)
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} else {
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dockerDataList = append(dockerDataList, dockerDataListTasks...)
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}
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}
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}
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return dockerDataList, err
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}
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func (p *Provider) parseService(ctx context.Context, service swarmtypes.Service, networkMap map[string]*dockertypes.NetworkResource) (dockerData, error) {
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logger := log.FromContext(ctx)
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dData := dockerData{
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ID: service.ID,
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ServiceName: service.Spec.Annotations.Name,
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Name: service.Spec.Annotations.Name,
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Labels: service.Spec.Annotations.Labels,
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NetworkSettings: networkSettings{},
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}
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extraConf, err := p.getConfiguration(dData)
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if err != nil {
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return dockerData{}, err
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}
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dData.ExtraConf = extraConf
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if service.Spec.EndpointSpec != nil {
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if service.Spec.EndpointSpec.Mode == swarmtypes.ResolutionModeDNSRR {
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if dData.ExtraConf.Docker.LBSwarm {
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logger.Warnf("Ignored %s endpoint-mode not supported, service name: %s. Fallback to Traefik load balancing", swarmtypes.ResolutionModeDNSRR, service.Spec.Annotations.Name)
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}
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} else if service.Spec.EndpointSpec.Mode == swarmtypes.ResolutionModeVIP {
|
|
dData.NetworkSettings.Networks = make(map[string]*networkData)
|
|
for _, virtualIP := range service.Endpoint.VirtualIPs {
|
|
networkService := networkMap[virtualIP.NetworkID]
|
|
if networkService != nil {
|
|
if len(virtualIP.Addr) > 0 {
|
|
ip, _, _ := net.ParseCIDR(virtualIP.Addr)
|
|
network := &networkData{
|
|
Name: networkService.Name,
|
|
ID: virtualIP.NetworkID,
|
|
Addr: ip.String(),
|
|
}
|
|
dData.NetworkSettings.Networks[network.Name] = network
|
|
} else {
|
|
logger.Debugf("No virtual IPs found in network %s", virtualIP.NetworkID)
|
|
}
|
|
} else {
|
|
logger.Debugf("Network not found, id: %s", virtualIP.NetworkID)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return dData, nil
|
|
}
|
|
|
|
func listTasks(ctx context.Context, dockerClient client.APIClient, serviceID string,
|
|
serviceDockerData dockerData, networkMap map[string]*dockertypes.NetworkResource, isGlobalSvc bool,
|
|
) ([]dockerData, error) {
|
|
serviceIDFilter := filters.NewArgs()
|
|
serviceIDFilter.Add("service", serviceID)
|
|
serviceIDFilter.Add("desired-state", "running")
|
|
|
|
taskList, err := dockerClient.TaskList(ctx, dockertypes.TaskListOptions{Filters: serviceIDFilter})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var dockerDataList []dockerData
|
|
for _, task := range taskList {
|
|
if task.Status.State != swarmtypes.TaskStateRunning {
|
|
continue
|
|
}
|
|
dData := parseTasks(ctx, task, serviceDockerData, networkMap, isGlobalSvc)
|
|
if len(dData.NetworkSettings.Networks) > 0 {
|
|
dockerDataList = append(dockerDataList, dData)
|
|
}
|
|
}
|
|
return dockerDataList, err
|
|
}
|
|
|
|
func parseTasks(ctx context.Context, task swarmtypes.Task, serviceDockerData dockerData,
|
|
networkMap map[string]*dockertypes.NetworkResource, isGlobalSvc bool,
|
|
) dockerData {
|
|
dData := dockerData{
|
|
ID: task.ID,
|
|
ServiceName: serviceDockerData.Name,
|
|
Name: serviceDockerData.Name + "." + strconv.Itoa(task.Slot),
|
|
Labels: serviceDockerData.Labels,
|
|
ExtraConf: serviceDockerData.ExtraConf,
|
|
NetworkSettings: networkSettings{},
|
|
}
|
|
|
|
if isGlobalSvc {
|
|
dData.Name = serviceDockerData.Name + "." + task.ID
|
|
}
|
|
|
|
if task.NetworksAttachments != nil {
|
|
dData.NetworkSettings.Networks = make(map[string]*networkData)
|
|
for _, virtualIP := range task.NetworksAttachments {
|
|
if networkService, present := networkMap[virtualIP.Network.ID]; present {
|
|
if len(virtualIP.Addresses) > 0 {
|
|
// Not sure about this next loop - when would a task have multiple IP's for the same network?
|
|
for _, addr := range virtualIP.Addresses {
|
|
ip, _, _ := net.ParseCIDR(addr)
|
|
network := &networkData{
|
|
ID: virtualIP.Network.ID,
|
|
Name: networkService.Name,
|
|
Addr: ip.String(),
|
|
}
|
|
dData.NetworkSettings.Networks[network.Name] = network
|
|
}
|
|
} else {
|
|
log.FromContext(ctx).Debugf("No IP addresses found for network %s", virtualIP.Network.ID)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return dData
|
|
}
|