7

the debug.log file is getting pretty big on bitcoind. how do you limit the size of the file? im on ubuntu 12

6

You can use logrotate.
Create a file named bitcoin-debug in /etc/logrotate.d.

This is the contents:

/home/bitcoin/.bitcoin/debug.log
{
        rotate 5
        copytruncate
        daily
        missingok
        notifempty
        compress
        delaycompress
        sharedscripts
}

Replace /home/bitcoin/.bitcoin/debug.log with the actual path to your debug.log file.

The full logrotate manpage is here: http://manpages.ubuntu.com/manpages/jaunty/man8/logrotate.8.html

UPDATE: In ubuntu the logrotate daemon manages many different log files. In the /etc/logrotate.d folder, each file contains instructions for the logrotate deamon. Adding this file tells logrotate that you want to copy and then truncate the debug.log once a day. The other options tell it to compress the old logs after a day and to keep only 5 older logs.

I originally found out about logrotate from this thread: https://bitcointalk.org/index.php?topic=130533.0

  • i dont get how this works. can you explain. thanks! – Patoshi パトシ Dec 17 '13 at 17:46
  • do i need to do anything to kick off the daemon, or does it automatically start doing it? – tofutim Apr 5 '18 at 20:25
  • logrotate runs by default in ubuntu so you don't need to do anything other than adding files to the /etc/logrotate.d folder. – hsmiths May 12 '18 at 18:52
7

Add -shrinkdebuglog to the options you use to start bitcoin, or add shrinkdebuglog=1 to your bitcoin.conf.

Every startup, if the log is larger than 1MB, it will shrink it to 200KB.

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