write log to file for tail

etc/systemd/system/mnml.service

@@ -7,8 +7,9 @@ ExecStart=/usr/local/mnml/bin/mnml
 KillMode=process
 Restart=on-failure
 RestartPreventExitStatus=255
+
+#StandardOutput=file:/var/log/mnml/mnml.log
 StandardOutput=null
-StandardError=null
 
 [Install]
 WantedBy=multi-user.target

server/src/lib.rs

@@ -72,6 +72,7 @@ pub fn setup_logger() -> Result<(), fern::InitError> {
 
     let syslog = fern::Dispatch::new()
         .level(log::LevelFilter::Info)
+        .chain(fern::log_file("/var/log/mnml/mnml.log")?)
         .chain(syslog::unix(formatter).unwrap());
 
     let colors_line = ColoredLevelConfig::new()