etcdmain: fix logging flag documentation

Documentation/configuration.md

@@ -149,6 +149,17 @@ The security flags help to [build a secure etcd cluster][security].
 + Path to the peer server TLS trusted CA file.
 + default: none
 
+### Logging Flags
+
+##### -debug
++ Drop the default log level to DEBUG for all subpackages.
++ default: false (INFO for all packages)
+
+##### -log-package-levels
++ Set individual etcd subpackages to specific log levels. An example being `etcdserver=WARNING,security=DEBUG` 
++ default: none (INFO for all packages)
+
+
 ### Unsafe Flags
 
 Please be CAUTIOUS when using unsafe flags because it will break the guarantees given by the consensus protocol.

etcdmain/config.go

@@ -96,8 +96,8 @@ type config struct {
 	clientTLSInfo, peerTLSInfo transport.TLSInfo
 
 	// logging
-	debug   bool
+	debug        bool
-	logPkgs string
+	logPkgLevels string
 
 	// unsafe
 	forceNewCluster bool
@@ -185,7 +185,7 @@ func NewConfig() *config {
 
 	// logging
 	fs.BoolVar(&cfg.debug, "debug", false, "Enable debug output to the logs.")
-	fs.StringVar(&cfg.logPkgs, "log-packages", "", "Specify a particular log level for each etcd package.")
+	fs.StringVar(&cfg.logPkgLevels, "log-package-levels", "", "Specify a particular log level for each etcd package.")
 
 	// unsafe
 	fs.BoolVar(&cfg.forceNewCluster, "force-new-cluster", false, "Force to create a new one member cluster")

etcdmain/etcd.go

@@ -399,9 +399,9 @@ func setupLogging(cfg *config) {
 	if cfg.debug {
 		capnslog.SetGlobalLogLevel(capnslog.DEBUG)
 	}
-	if cfg.logPkgs != "" {
+	if cfg.logPkgLevels != "" {
 		repoLog := capnslog.MustRepoLogger("github.com/coreos/etcd")
-		settings, err := repoLog.ParseLogLevelConfig(cfg.logPkgs)
+		settings, err := repoLog.ParseLogLevelConfig(cfg.logPkgLevels)
 		if err != nil {
 			log.Warningf("Couldn't parse log level string: %s, continuing with default levels", err.Error())
 			return

etcdmain/help.go

@@ -96,6 +96,12 @@ security flags:
 	--peer-trusted-ca-file ''
 		path to the peer server TLS trusted CA file.
 
+logging flags
+
+	--debug 'false'
+		enable debug-level logging for etcd.
+	--log-package-levels ''
+		set individual packages to various log levels (eg: 'etcdmain=CRITICAL,etcdserver=DEBUG')
 
 unsafe flags: