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Posts tagged as logrotate

Auto-upgrade for Debian based systems

A reliable auto-updater for home use. It can be executed e.g. at boot from /etc/rc.local to keep apt based systems up-to-date. Some output will be logged to /var/log/safe-upgrade.log, in case of upgraded or held packages as well as errors a report will be sent to root@localhost.

Update August, 2020: Command line option "--full" for Dist-Upgrade.

#!/bin/sh
#
# safe-upgrade.sh
#
# automated "safe-upgrade" for apt-based distributions with logging
# to /var/log/safe-upgrade.log and a mail to root@localhost in case
# of upgraded packages or problems
# optional command line parameter "--full" will run a dist-upgrade

pingtest=debian.org
hostname=`hostname`
logfile=/var/log/safe-upgrade.log
mailto=root@localhost

if [ X"$@" = X"--full" ] ; then
        task=dist-upgrade
else
        task=upgrade
fi

sleep 15
echo ----- `date` ----- >> "$logfile"
ping -c 1 "$pingtest" > /dev/null 2>> "$logfile" ||\
    {
        echo "System upgrade cancelled: No internet connection." |\
        tee -a "$logfile" |\
        mailx -s "$hostname"\ update\ \*\*\*ERROR\*\*\* "$mailto"
        exit 0
    }
DEBIAN_FRONTEND=noninteractive
apt-get -q=2 update 2>&1 |\
    tee -a "$logfile" |\
    mailx -E -s "$hostname"\ update\ \*\*\*ERROR\*\*\* "$mailto"
apt-get "$task" -y -q 2>&1 |\
    grep -ve "^(\{0,1\}Reading" \
         -e "^Building" \
         -e "^Calculating" |\
    tee -a "$logfile" |\
    grep -ve "^0 upgraded.*0 not upgraded\.$" |\
    mailx -E -s "$hostname"\ upgrade\ log "$mailto" &&
echo ----- DONE ----- >> "$logfile"
exit 0

To tame the daily growing log file, add the following lines to /etc/logrotate.conf or into an own file in /etc/logrotate.d/. This will keep compressed archives of the last three months' log files.

### File: /etc/logrotate.conf

/var/log/safe-upgrade.log {
    monthly
    create
    rotate 3
}

If you want the script to be executed by cron, it is necessary to set the $PATH variable - in the script itself, or in the crontab. This example runs every three hours at 45':

### File: root crontab, open to edit with "crontab -e"

# m h  dom mon dow   command
45 */3 * * * PATH='/usr/sbin:/usr/bin:/sbin:/bin' /path/to/safe-upgrade.sh