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Support cluster-external Kubernetes client. (#1159)

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Detect whether in-cluster or cluster-external Kubernetes client should
be used based on the KUBERNETES_SERVICE_{HOST,PORT} environment
variables.

Adds bearer token and CA certificate file path parameters.
This commit is contained in:
Timo Reimann 2017-03-07 13:09:11 +01:00 • committed by GitHub
parent 3611818eda
commit 920b5bb15d
5 changed files with 122 additions and 34 deletions
Download patch file Download diff file Expand all files Collapse all files

20
provider/kubernetes.go
View file

@ -1,6 +1,8 @@
package provider
import (
"fmt"
"os"
"reflect"
"strconv"
"strings"
@ -30,7 +32,9 @@ const (
// Kubernetes holds configurations of the Kubernetes provider.
type Kubernetes struct {
BaseProvider `mapstructure:",squash"`
Endpoint string `description:"Kubernetes server endpoint"`
Endpoint string `description:"Kubernetes server endpoint (required for external cluster client)"`
Token string `description:"Kubernetes bearer token (not needed for in-cluster client)"`
CertAuthFilePath string `description:"Kubernetes certificate authority file path (not needed for in-cluster client)"`
DisablePassHostHeaders bool `description:"Kubernetes disable PassHost Headers"`
Namespaces k8s.Namespaces `description:"Kubernetes namespaces"`
LabelSelector string `description:"Kubernetes api label selector to use"`
@ -38,12 +42,18 @@ type Kubernetes struct {
}
func (provider *Kubernetes) newK8sClient() (k8s.Client, error) {
withEndpoint := ""
if provider.Endpoint != "" {
log.Infof("Creating in cluster Kubernetes client with endpoint %v", provider.Endpoint)
return k8s.NewInClusterClientWithEndpoint(provider.Endpoint)
withEndpoint = fmt.Sprintf(" with endpoint %v", provider.Endpoint)
}
log.Info("Creating in cluster Kubernetes client")
return k8s.NewInClusterClient()
if os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "" {
log.Infof("Creating in-cluster Kubernetes client%s\n", withEndpoint)
return k8s.NewInClusterClient(provider.Endpoint)
}
log.Infof("Creating cluster-external Kubernetes client%s\n", withEndpoint)
return k8s.NewExternalClusterClient(provider.Endpoint, provider.Token, provider.CertAuthFilePath)
}
// Provide allows the provider to provide configurations to traefik