Add support for sensu-backend service environment variables (#3335)

Fixes #2680

Signed-off-by: Trey Dockendorf <[email protected]>

Author: treydock

CHANGELOG.md

@@ -11,6 +11,7 @@ Versioning](http://semver.org/spec/v2.0.0.html).
 - Added the `APIKey` resource and HTTP API support for POST, GET, and DELETE.
 - Added sensuctl commands to manage the `APIKey` resource.
 - Added support for api keys to be used in api authentication.
+- Added support for sensu-backend service environment variables
 
 ## [5.14.1] - 2019-10-16
 

backend/cmd/start.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"strings"
 	"syscall"
 
 	corev2 "github.com/sensu/sensu-go/api/core/v2"
@@ -412,6 +413,10 @@ func StartCommand(initialize initializeFunc) *cobra.Command {
 	viper.RegisterAlias(deprecatedFlagEtcdNodeName, flagEtcdNodeName)
 	viper.RegisterAlias(deprecatedFlagEtcdPeerURLs, flagEtcdPeerURLs)
 
+	viper.SetEnvPrefix("sensu_backend")
+	viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
+	viper.AutomaticEnv()
+
 	// Use our custom template for the start command
 	cobra.AddTemplateFunc("categoryFlags", categoryFlags)
 	cmd.SetUsageTemplate(startUsageTemplate)