Add log file close and reopen on receipt of SIGUSR1

server/server_signals.go

@@ -0,0 +1,38 @@
+// +build !windows
+
+package server
+
+import (
+	"os/signal"
+	"syscall"
+
+	"github.com/containous/traefik/log"
+)
+
+func (server *Server) configureSignals() {
+	signal.Notify(server.signals, syscall.SIGINT, syscall.SIGTERM, syscall.SIGUSR1)
+}
+
+func (server *Server) listenSignals() {
+	for {
+		sig := <-server.signals
+		switch sig {
+		case syscall.SIGUSR1:
+			log.Infof("Closing and re-opening log files for rotation: %+v", sig)
+
+			if server.accessLoggerMiddleware != nil {
+				if err := server.accessLoggerMiddleware.Rotate(); err != nil {
+					log.Errorf("Error rotating access log: %s", err)
+				}
+			}
+
+			if err := log.RotateFile(); err != nil {
+				log.Errorf("Error rotating error log: %s", err)
+			}
+		default:
+			log.Infof("I have to go... %+v", sig)
+			log.Info("Stopping server")
+			server.Stop()
+		}
+	}
+}