How To Fix Email Service Unavailable Delivery Issues with IPv6 on Amazon Linux

Author: , July 16th, 2021

PROBLEM: Email delivery to Google was failing with a “Service Unavailable” error:

Note that the network address for the destination is shown as IPv6! That is the root cause of the issue: 1. Sendmail is sending mail from the IPv6 address instead of the IPv4 address 2. Google rejects IPv6 senders without proper reverse […]

How To Restart a Hung Top Menu Bar in MacOS

Author: , April 23rd, 2021

Ever get the spinning beachball when trying to access the top menu on your Mac? SOLUTIONS Use the GUI Open the Activity Monitor application Select All Processes from the View menu Click on the SystemUIServer process, then click Force Quit. ~or~ Via CLI In Terminal, execute killall SystemUIServer

How To Enable HTTPS For Grafana Using Existing LetsEncrypt Certificates

Author: , July 15th, 2020

How To Enable Anonymous Access For Grafana

Author: , July 15th, 2020

How To Restart Apache Using cron If the Load Gets Too High

Author: , February 3rd, 2016

There are times when the hackers slam my servers and the load gets too high. I use a very simple bash script as a cron job to monitor the load and take action when it gets too high. The script will stop httpd, sleep for a configurable period of time (currently 3 minutes), then start […]

How To Auto-Restart Apache If the Load Gets Too High

Author: , September 15th, 2015

The script to check and restart apache…works on CentOS – YMMV!

Add to cron * * * * * /root/restart_apache_if_load_hits_threshold.sh >> /var/log/restart_apache_if_load_hits_threshold.log 2>&1