systemd: suppress logging each message twice when run via systemd (rh #751275)

diff --git a/data/NetworkManager.service.in b/data/NetworkManager.service.in
index bb169fb..1198c1b 100644 (file)
--- a/data/NetworkManager.service.in
+++ b/data/NetworkManager.service.in
@@ -8,6 +8,10 @@ Before=network.target
 Type=dbus
 BusName=org.freedesktop.NetworkManager
 ExecStart=@sbindir@/NetworkManager --no-daemon
+# Suppress stderr to eliminate duplicated messages in syslog. NM calls openlog()
+# with LOG_PERROR when run in foreground. But systemd redirects stderr to
+# syslog by default, which results in logging each message twice.
+StandardError=null
 
 [Install]
 WantedBy=multi-user.target