https://tech.snathan.org/ 2026-05-13T09:31:36+00:00 https://tech.snathan.org/ https://tech.snathan.org/_media/wiki/dokuwiki.svg text/html 2023-11-14T12:32:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/linux/others/journalctl?rev=1699965129&do=diff journalctl Show Logs # All log entries for postfix journalctl _UID=`id -u postfix` --no-pager # Or journalctl _SYSTEMD_UNIT=postfix@-.service journalctl _SYSTEMD_UNIT=ssh.service journalctl -u ssh.service journalctl -u ssh.service -u postfix@-.service text/html 2014-11-15T15:13:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/linux/others/notify_reboot_req?rev=1416064423&do=diff Email notification of reboot This can / should be setup using nagios, but here it is anyway! * Include this in cron.daily. * Change the email address before enabling. #!/bin/sh -e # HOST=`hostname` if [ -f /var/run/reboot-required ]; then #echo "Sytem will reboot in 5 minutes ..." | /usr/bin/wall #sleep 240 #echo "Sytem will reboot in 1 minute ..." | /usr/bin/wall #sleep 60 cat /var/run/reboot-required | mailx -s "Reboot required on $HOST" system@example.com #… text/html 2014-11-15T15:13:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/linux/others/ntp_update?rev=1416064423&do=diff Adjust System Clock by polling Network Time Protocol (NTP) server Create below script /etc/cron.daily/ntpdate Comment out the echo statements to avoid cron spewing out mail daily! #!/bin/bash # # Update time daily # echo "hwclock: Before running ntpdate date: `hwclock -r`" echo "rtclock: Before running ntpdate date: `date`" /usr/sbin/ntpdate ntp.ubuntu.com pool.ntp.org echo "hwclock: After running ntpdate date: `hwclock -r`" echo "rtclock: After running ntpdate date: `date`" echo " " # exit … text/html 2023-10-17T11:31:52+00:00 Anonymous (anonymous@undisclosed.example.com) https://tech.snathan.org/tech/linux/others/pflogsumm_mail_report?rev=1697542312&do=diff pflogsumm Mail reports pflogsumm is a simple yet great mail summary reporting tool. You can install it using aptitude. Features/Tasks and Limitations * Emails report via cron * Keeps 40 days worth of reporting at /var/log/postfixrep * Limitation: Since log rotate does not do a daily rotation, reports will overlap!