Posts tagged logrotate

linux logrotate
posted on 2014-11-28 17:42:24

To avoid overflowing harddisks, use logrotate. It consists of two parts.

config file

First, a config entry either in /etc/logrotate.conf, or in a dedicated file in /etc/logrotate.d/<filename>. (This works since logrotate.d is refeferenced from logrotate.conf.)

Here's an example from mysql:

/var/log/mysql.log /var/log/mysql/mysql.log /var/log/mysql/mysql-slow.log /var/log/mysql/error.log {
    daily
    rotate 7
    missingok
    create 640 mysql adm
    compress
    sharedscripts
    postrotate
        test -x /usr/bin/mysqladmin || exit 0
        # If this fails, check debian.conf! 
        MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"
        if [ -z "`$MYADMIN ping 2>/dev/null`" ]; then
            # Really no mysqld or rather a missing debian-sys-maint user?
            # If this occurs and is not a error please report a bug.
            #if ps cax | grep -q mysqld; then
            if killall -q -s0 -umysql mysqld; then
                exit 1
            fi 
        else
            $MYADMIN flush-logs
        fi
    endscript
}

In the first line the files to be rotated are specified, in the body all options are stated. This is also an example for a 'script' to run after the rotation (this is what the postrotate section is for).

Usually these are fine:

rotate 7
daily
missingok
notifempty
delaycompress

In case you get an error along the lines of '... has insecure permissions. ... . Set the "su" directive...' simply specify the user/group like this:

# like this
su mysql adm

# this is just here for illustration
rotate 7
daily
missingok
notifempty
delaycompress

cronjob

To run the logrotate regularily, a cron has to be installed.

I.e. in /etc/cron.d/my_cronjob_for_logrotate:

1 23 * * * root /usr/sbin/logrotate -f /etc/logrotate.conf > /dev/null 2>&1

apache: logrotate or rotatelogs?

The apache web server can take care of the logs himself, too. This is easiest done through an option in the vhost config. See here. That way you do not need to set up external logrotating afterwards.

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