Small fixes and improvments

docs/toml.md

@@ -1453,3 +1453,72 @@ Træfɪk needs the following policy to read ECS information:
     ]
 }
 ```
+
+# Rancher backend
+
+Træfɪk can be configured to use Rancher as a backend configuration:
+
+
+```toml
+################################################################
+# Rancher configuration backend
+################################################################
+
+# Enable Rancher configuration backend
+#
+# Optional
+#
+[rancher]
+
+# Default domain used.
+# Can be overridden by setting the "traefik.domain" label on an service.
+#
+# Required
+#
+domain = "rancher.localhost"
+
+# Enable watch Rancher changes
+#
+# Optional
+# Default: true
+#
+Watch = true
+
+# Expose Rancher services by default in traefik
+#
+# Optional
+# Default: true
+#
+ExposedByDefault = false
+
+# Endpoint to use when connecting to Rancher
+#
+# Optional
+# Endpoint = "http://rancherserver.example.com"
+
+# AccessKey to use when connecting to Rancher
+#
+# Optional
+# AccessKey = "XXXXXXXXX"
+
+# SecretKey to use when connecting to Rancher
+#
+# Optional
+# SecretKey = "XXXXXXXXXXX"
+
+```
+
+If you're deploying traefik as a service within rancher, you can alternatively set these labels on the service to let it only fetch data of its current environment. The settings `endpoint`, `accesskey` and `secretkey` can be omitted then.
+
+- `io.rancher.container.create_agent=true`
+- `io.rancher.container.agent.role=environment`
+
+Labels can be used on task containers to override default behaviour:
+
+- `traefik.protocol=https`: override the default `http` protocol
+- `traefik.weight=10`: assign this weight to the container
+- `traefik.enable=false`: disable this container in Træfɪk
+- `traefik.frontend.rule=Host:test.traefik.io`: override the default frontend rule (Default: `Host:{containerName}.{domain}`).
+- `traefik.frontend.passHostHeader=true`: forward client `Host` header to the backend.
+- `traefik.frontend.priority=10`: override default frontend priority
+- `traefik.frontend.entryPoints=http,https`: assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`.

examples/compose-rancher.yml

@@ -0,0 +1,10 @@
+traefik:
+  image: traefik
+  command: --web --rancher --rancher.domain=rancher.localhost --logLevel=DEBUG
+    labels:
+      io.rancher.container.agent.role: environment
+      io.rancher.container.create_agent: 'true'
+  ports:
+    - "80:80"
+    - "443:443"
+    - "8080:8080"

provider/rancher.go

@@ -4,6 +4,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+	"text/template"
+	"time"
+
 	"github.com/BurntSushi/ty/fun"
 	"github.com/cenk/backoff"
 	"github.com/containous/traefik/job"
@@ -11,11 +18,6 @@ import (
 	"github.com/containous/traefik/safe"
 	"github.com/containous/traefik/types"
 	rancher "github.com/rancher/go-rancher/client"
-	"math"
-	"strconv"
-	"strings"
-	"text/template"
-	"time"
 )
 
 const (
@@ -72,7 +74,7 @@ func (provider *Rancher) getFrontendRule(service rancherData) string {
 	if label, err := getServiceLabel(service, "traefik.frontend.rule"); err == nil {
 		return label
 	}
-	return "Host:" + strings.ToLower(strings.Replace(service.Name, "/", "_", -1)) + "." + provider.Domain
+	return "Host:" + strings.ToLower(strings.Replace(service.Name, "/", ".", -1)) + "." + provider.Domain
 }
 
 func (provider *Rancher) getFrontendName(service rancherData) string {
@@ -193,13 +195,26 @@ func getServiceLabel(service rancherData, label string) (string, error) {
 }
 
 func (provider *Rancher) createClient() (*rancher.RancherClient, error) {
+
+	rancherURL := getenv("CATTLE_URL", provider.Endpoint)
+	accessKey := getenv("CATTLE_ACCESS_KEY", provider.AccessKey)
+	secretKey := getenv("CATTLE_SECRET_KEY", provider.SecretKey)
+
 	return rancher.NewRancherClient(&rancher.ClientOpts{
-		Url:       provider.Endpoint,
-		AccessKey: provider.AccessKey,
-		SecretKey: provider.SecretKey,
+		Url:       rancherURL,
+		AccessKey: accessKey,
+		SecretKey: secretKey,
 	})
 }
 
+func getenv(key, fallback string) string {
+	value := os.Getenv(key)
+	if len(value) == 0 {
+		return fallback
+	}
+	return value
+}
+
 // Provide allows the provider to provide configurations to traefik
 // using the given configuration channel.
 func (provider *Rancher) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
@@ -207,6 +222,12 @@ func (provider *Rancher) Provide(configurationChan chan<- types.ConfigMessage, p
 	safe.Go(func() {
 		operation := func() error {
 			rancherClient, err := provider.createClient()
+
+			if err != nil {
+				log.Errorf("Failed to create a client for rancher, error: %s", err)
+				return err
+			}
+
 			ctx := context.Background()
 			var environments = listRancherEnvironments(rancherClient)
 			var services = listRancherServices(rancherClient)
@@ -214,11 +235,6 @@ func (provider *Rancher) Provide(configurationChan chan<- types.ConfigMessage, p
 
 			var rancherData = parseRancherData(environments, services, container)
 
-			if err != nil {
-				log.Errorf("Failed to create a client for rancher, error: %s", err)
-				return err
-			}
-
 			configuration := provider.loadRancherConfig(rancherData)
 			configurationChan <- types.ConfigMessage{
 				ProviderName:  "rancher",

provider/rancher_test.go

@@ -87,6 +87,12 @@ func TestRancherGetFrontendRule(t *testing.T) {
 			},
 			expected: "Host:foo.rancher.localhost",
 		},
+		{
+			service: rancherData{
+				Name: "foo/bar",
+			},
+			expected: "Host:foo.bar.rancher.localhost",
+		},
 		{
 			service: rancherData{
 				Name: "test-service",
@@ -388,7 +394,7 @@ func TestRancherLoadRancherConfig(t *testing.T) {
 		{
 			services: []rancherData{
 				{
-					Name: "test-service",
+					Name: "test/service",
 					Labels: map[string]string{
 						"traefik.port": "80",
 					},
@@ -405,7 +411,7 @@ func TestRancherLoadRancherConfig(t *testing.T) {
 
 					Routes: map[string]types.Route{
 						"route-frontend-Host-test-service-rancher-localhost": {
-							Rule: "Host:test-service.rancher.localhost",
+							Rule: "Host:test.service.rancher.localhost",
 						},
 					},
 				},

traefik.sample.toml

@@ -935,6 +935,52 @@
 #
 # filename = "ecs.tmpl"
 
+################################################################
+# Rancher configuration backend
+################################################################
+
+# Enable Rancher configuration backend
+#
+# Optional
+#
+[rancher]
+
+# Default domain used.
+# Can be overridden by setting the "traefik.domain" label on an service.
+#
+# Required
+#
+domain = "rancher.localhost"
+
+# Enable watch Rancher changes
+#
+# Optional
+# Default: true
+#
+Watch = true
+
+# Expose Rancher services by default in traefik
+#
+# Optional
+# Default: true
+#
+ExposedByDefault = false
+
+# Endpoint to use when connecting to Rancher
+#
+# Optional
+# Endpoint = "http://rancherserver.example.com"
+
+# AccessKey to use when connecting to Rancher
+#
+# Optional
+# AccessKey = "XXXXXXXXX"
+
+# SecretKey to use when connecting to Rancher
+#
+# Optional
+# SecretKey = "XXXXXXXXXXX"
+
 
 ################################################################
 # Sample rules