Synology usage series 10 – Truncate and backup Openvpn log file


My OpenVPN server crashed everyday :'(. I have no idea why it crashed, I tried to read the log but I figured out that the log grown to 2GB whenever it crahsed XX( The log files is just too hugh to inspect.

I guess the root cause is the file size of the log file crashed the server. Luckily I have enabled incoming SSH access to fix this remotely.

So I just wrote couple lines in a shell script and made a scheduled job to truncate and backup the log file to prevent further issue.

Update Aug 4 2009

Yes it is indeed the root cause crashing the OpenVPN server. The script here works and prevent the VPN server crash again.


1. Login as root. Create a shell script /opt/etc/openvpn/jail/log/archivelog


#!/opt/bin/bash

logpath='/opt/etc/openvpn/jail/log'
datestamp=`date '+%Y%m%d%H%M%S'`

tar cvf $logpath/openvpn.log.$datestamp.tar $logpath/openvpn.log
gzip $logpath/openvpn.log.$datestamp.tar
echo '' > $logpath/openvpn.log

2. Make the script executable

# chmod 700 /opt/etc/openvpn/jail/log/archivelog

3. Add an entry in /etc/crontab, add a job to execute the archivelog script per hour


#minute hour    mday    month   wday    who     command
30      *       *       *       *       root    /opt/bin/bash /opt/etc/openvpn/jail/log/archivelog

4. restart cron


# /usr/syno/etc/rc.d/S04crond.sh stop
# /usr/syno/etc/rc.d/S04crond.sh start





One thought


  1. Pingback: » Synology DS207+ usage series 7 – Setup OpenVPN server (Routed mode) on DS207+ , Windows OpenVPN Client and DS101j OpenVPN client Blog of Ray

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