make the location of the log file configurable

.gitignore

@@ -45,3 +45,6 @@ autom4te.cache/
 config.log
 config.status
 Makefile
+
+# log file
+influxdb.log

Makefile.in

@@ -235,6 +235,11 @@ define sample_config
 # seed-servers =
 datadir     = "/opt/influxdb/shared/data/db"
 
+[logging]
+# logging level can be one of "debug", "info", "warn" or "error"
+# level  = "info"
+file   = "/opt/influxdb/shared/log.txt"
+
 # Configure the admin server
 [admin]
 # port   = 8083

config.toml.sample

@@ -7,6 +7,11 @@
 # seed-servers =
 # datadir     = "/tmp/influxdb/development/db"
 
+[logging]
+# logging level can be one of "debug", "info", "warn" or "error"
+# level  = "info"
+# file   = "influxdb.log"
+
 # Configure the admin server
 [admin]
 # port   = 8083

src/configuration/configuration.go

@@ -21,6 +21,8 @@ type Configuration struct {
 	RaftDir        string
 	ProtobufPort   int
 	Hostname       string
+	LogFile        string
+	LogLevel       string
 }
 
 func LoadConfiguration(fileName string) *Configuration {
@@ -42,6 +44,8 @@ func parseTomlConfiguration(filename string) (*Configuration, error) {
 	seedServers := configSet.String("seed-servers", "")
 	dataDir := configSet.String("datadir", "/tmp/influxdb/development/db")
 	protobufPort := configSet.Int("protobuf.port", 8099)
+	logFile := configSet.String("logging.file", "influxdb.log")
+	logLevel := configSet.String("logging.level", "info")
 
 	if err := configSet.Parse(filename); err != nil {
 		return nil, err
@@ -55,6 +59,8 @@ func parseTomlConfiguration(filename string) (*Configuration, error) {
 		RaftDir:        *raftDir,
 		ProtobufPort:   *protobufPort,
 		DataDir:        *dataDir,
+		LogFile:        *logFile,
+		LogLevel:       *logLevel,
 	}
 
 	servers := strings.Split(*seedServers, ",")

src/daemon/influxd.go

@@ -67,7 +67,7 @@ func startProfiler(filename *string) error {
 	return nil
 }
 
-func setupLogging(loggingLevel string) {
+func setupLogging(loggingLevel, logFile string) {
 	level := log.DEBUG
 	switch loggingLevel {
 	case "info":
@@ -81,6 +81,15 @@ func setupLogging(loggingLevel string) {
 	for _, filter := range log.Global {
 		filter.Level = level
 	}
+
+	flw := log.NewFileLogWriter(logFile, false)
+	flw.SetFormat("[%D %T] [%L] (%S) %M")
+	flw.SetRotate(true)
+	flw.SetRotateSize(0)
+	flw.SetRotateLines(0)
+	flw.SetRotateDaily(true)
+	log.AddFilter("file", level, flw)
+	log.Info("Redirectoring logging to %s", logFile)
 }
 
 func main() {
@@ -95,13 +104,12 @@ func main() {
 
 	startProfiler(cpuProfiler)
 
-	setupLogging("debug")
-
 	if wantsVersion != nil && *wantsVersion {
 		fmt.Printf("InfluxDB v%s (git: %s)\n", version, gitSha)
 		return
 	}
 	config := configuration.LoadConfiguration(*fileName)
+	setupLogging(config.LogLevel, config.LogFile)
 
 	if pidFile != nil && *pidFile != "" {
 		pid := strconv.Itoa(os.Getpid())