How do I use a cronjob to truncate all logs on my Centos 7 server to 1 gig max size?

badwolfff
badwolfff used Ask the Experts™
on
I am running a VPS with centos 7 and have several websites sites hosted on it (wordpress, magento, joomla, opencart, corephp). I am looking for a way (cronjob if possible) that can truncate the various error.log and other log files of these sites to a max size of 1 gb each. I am imagining a script that can search for .log files on the server and truncate them at a fixed interval, if it is possible to create such a cronjob (using logrotate?). If not I don't mind setting one cronjob per error.log or whatever.log file if someone here could help me create the cronjob query that can do it.

thanks in advance
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Zephyr ICTCloud Architect

Commented:
Maybe I'm missing the intended goal, but if you use logrotate you can let the logs rotate on the size you want, with the "size" parameter.

From the MAN:
size
Log files are rotated only if they grow bigger then size bytes. If size is followed by k, the size is assumed to be in kilobytes. If the M is used, the size is in megabytes, and if G is used, the size is in gigabytes. So size 100, size 100k, size 100M and size 100Gare all valid.
badwolfff

Author

Commented:
Yes thanks, I had heaed about logrotate but have absolutely no idea about using it.
There are many log files on my server and they are getting bulkier by the day.

How do I run or program or activate this "logrotate"?
Could you help me with the steps as I don't even know where to begin and I certainly don't want to do anything that might bugger up the whole server!
Cloud Architect
Commented:
Logrotate should be in your system, you might find it under /etc/cron.daily/

Logrotate uses this file: /etc/logrotate.conf to rotate logrotate jobs you create.

It should contain something like this:
  weekly
      rotate 4
      create
      dateext
      include /etc/logrotate.d
      /var/log/wtmp {
          monthly
          create 0664 root utmp
              minsize 1M
          rotate 1
      }

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You can use this like it is, or adjust it for your needs.

Let's say you have a log called cpanel.log in /var/log, and we want to truncate it. We add a new conf file under /etc/logrotate.d/cpanel ... Enter something like following in the file:

/var/log/cpanel.log {
    missingok
    notifempty
    compress
    size 1G
    daily
    create 0600 root root
}

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And you can do that for each log

To know what all the different settings mean, I'd like to point you to the MAN

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