Git browser: sbin-tm/

#!/bin/sh

# 2021-04-11

PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin

interval=120
counter=0

while true;
do
        load=$(uptime | awk '{a=$(NF-2);sub(/,$/,"",a); print int(a+.5)}')
	echo -n $load
	echo -n ' - '

        if [ 10 -le $load ]
        then
		tm_http_categories_throttle.sh high
	else
		tm_http_categories_throttle.sh low
	fi

	if [ 30 -le $load ]
        then
		service httpd  stop
		service mysqld stop 
		service mysqld start
		service httpd  start
		echo -n 'restarted DB at '
		echo $(date)
		counter=$(($counter + 1))

                # long interval 
                sleep $interval
	else
		counter=0
		# tm_http_categories_throttle.sh low
        fi

	# if the load has been heavy for a while
	if test $counter -ge 3
	then
		tm_http_categories_throttle.sh high
		sleep $(($interval * 5))
	fi

        sleep 60
done

#!/bin/sh

# 2020-04-07
# updated 2021-04-23
# monitor CPU load and throttle via .htaccess if too high
# hysteresis is managed by not running the script frequently

PATH=/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin:

# implement alternative .htaccess settings at this load or higher
threshold=10
mode=${1}

# settings files: target, archive for normal, archive for high load
htaccess=/var/www/html/.htaccess
normal="${htaccess}.normal"
highload="${htaccess}.highload"

# verify that the source files exist
test -f ${normal}   || test -r ${normal}   || exit 1
test -f ${highload} || test -r ${highload} || exit 1

# exit on error
set -e

if [ ${mode} == 'high' ]
then
	cp ${highload} ${htaccess}
        echo -n 'Triggered: protected mode enabled at '
        echo $(date)
#	service httpd restart
	exit
elif [ ${mode} == 'low' ]
then
	cp ${normal} ${htaccess}
#        echo -n 'Triggered: normal mode enabled at '
#        echo $(date)
#	service httpd restart
	exit
fi

# scrape the current load average from top
load=$(top -b -n 1 | awk -F '[ ,]+' '{print int($12+.5);exit}')

# deal with it
if [ ${load} -ge ${threshold} ]; then
        cp ${highload} ${htaccess}
	echo -n 'Dealt with: protected mode enabled at '
	echo $(date)
else 
        cp ${normal} ${htaccess}
	echo -n 'Dealt with: normal mode enabled at '
        echo $(date)
fi

# service httpd restart

exit 0