How to logging?

Support
1

I start syncthing via rc.local, with this:

nice -n 19 ionice -c3 su -l syncthing -c "/home/syncthing/bin/syncthing" &

But what’s about logging?

I can redirect stdout and stderr into a file, maybe in /var/log/syncthing But then, the file will get bigger and bigger, isn’t it?

So i make currently this:

nice -n 19 ionice -c3 su -l syncthing -c "/home/syncthing/bin/syncthing" >> "/var/log/syncthing_$(date +"%Y%m")" 2>&1 &

So i will get one log file for one month…

Any better idea? Should syncthing implement a own file logging feature with a log-rotate?

2

You could pipe to logger and let whatever syslog system is in place do the rotation.

3

Can you give a example?

4

Sure. This is a start script I use with svrun on one of my machines;

#!/bin/sh

export HOME=/home/jb
export STNORESTART=1
setuidgid jb /home/jb/bin/syncthing 2>&1 | logger -t syncthing

When this runs, log output gets sent to regular syslog and can be handled by whatever syslog mechanisms you have in place.

jb@syncer:~$ sudo tail -f /var/log/syslog
May 21 14:06:15 syncer syncthing: [LGFPD] 14:06:15 INFO: syncthing v0.8.7-18-ge9eacfa (go1.2.2 linux-amd64) jb@jborg-mbp 2014-05-19 22:59:19 UTC
May 21 14:06:15 syncer syncthing: [LGFPD] 14:06:15 INFO: My ID: LGFPDIT7SKNNJVJZA4FC7QNCRKCE753K72BW5QD2FOZ7FRFEP57Q
May 21 14:06:15 syncer syncthing: [LGFPD] 14:06:15 INFO: Starting web GUI on http://0.0.0.0:8080/
May 21 14:06:15 syncer syncthing: [LGFPD] 14:06:15 INFO: Populating repository index
May 21 14:06:21 syncer syncthing: [LGFPD] 14:06:21 INFO: No UPnP IGD device found, no port mapping created (read udp4 0.0.0.0:46581: i/o timeout)
May 21 14:06:21 syncer syncthing: [LGFPD] 14:06:21 INFO: Sending local discovery announcements

We get a double timestamp, one from syncthing and one from syslog. Could have a flag to disable that in case the log data is timestamped externally but I haven’t been sufficiently annoyed by it yet.

2 Likes
5

I will try, thanks!

And yes, a flag for no timestamps would be good!

6

Hello there and on Windows?

7

Hello, Is there a way to get logger to log only certain information. Syncthing has log level in tags: INFO, OK etc.

do you know if there is a way, to force logger to get only WARNING message etc.

8

If you are on unix, you can pipe it through grep I guess.

1 Like
9

Is there a way to pipe to “logger -t syncthing” in a init.d deamon script, that will work correctly both when used with “service start/stop” as well as when syncthing is restarting due to configuration change? I’m on debian (raspberry) and Ubuntu 14.4. Havent been able to make it work so far.

10

look at this https://github.com/jedie/syncthing/wiki/Syncthing-in-Synology-DSM

I’ve achieved this by creating script in middle of start-stop-startus app and syncthing. This way daemon restarts also logger.

11

Thanks, I updated the script to my raspberry pi raspian setup, and inserted a missing function (daemon_status), please see below, this has now been tested both with service start/stop/status, syncthing restart from GUI after config update, syncthing version auto update and rebooting. Hope it will help someone: /etc/init.d script (named “syncthing”):

#!/bin/sh 
### BEGIN INIT INFO
# Provides: syncthing
# Required-Start: $local_fs $remote_fs
# Required-Stop: $local_fs $remote_fs
# Should-Start: $network
# Should-Stop: $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: daemonized version of syncthing.
# Description: Starts the syncthing daemon for user root
### END INIT INFO

# Package
PACKAGE="syncthing"
DNAME="Syncthing"

# Others
INSTALL_DIR="/usr/local/bin"
PATH="${INSTALL_DIR}:${PATH}"
USER="root"

SYNCTHING="${INSTALL_DIR}/syncthing.sh" 
SYNCTHINGAPP="${INSTALL_DIR}/syncthing"

daemon_status () 
{
   start-stop-daemon --start --test --exec ${SYNCTHINGAPP} >/dev/null 2>&1
    if [ $? -eq 0 ]; then 
        return 1 
    else 
        return 0 
    fi
}

start_daemon ()
{
    start-stop-daemon -b -o -c ${USER} -S -u ${USER} -x ${SYNCTHING} 
}


stop_daemon ()
{
    start-stop-daemon -o -c ${USER} -K -u ${USER} -x ${SYNCTHINGAPP}
}


case $1 in
    start)
        if daemon_status; then
            echo ${DNAME} is already running
        else
            echo Starting ${DNAME} ...
            start_daemon
        fi
        ;;
    stop)
        if daemon_status; then
            echo Stopping ${DNAME} ...
            stop_daemon
        else
            echo ${DNAME} is not running
        fi
        ;;
    status)
        if daemon_status; then
            echo ${DNAME} is running
            exit 0
        else
            echo ${DNAME} is not running
            exit 1
        fi
        ;;
    log)
        exit 1
        ;;
    *)
        exit 1
        ;;
esac

I have then created the following helping script to start syncthing and pipe output the the syslog daemon using the “logger” command. Script called “syncthing.sh” placed with syncthing binary:

#!/bin/sh
/usr/local/bin/syncthing 2>&1 | logger -t syncthing
1 Like
12