Scratch pad
This page is to keep items I will organize on the page later or ideas.
Analyse and calculate php-fpm runner settings https://megamorf.gitlab.io/2021/03/08/analyse-and-calculate-php-fpm-runner-settings/
Get average memory of the php-fpm process
ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
Get memory of all php-fpm processes
ps -eo size,pid,user,command --sort -size | awk '{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | grep php-fpm
How many cores does server have.
echo Cores = $(( $(lscpu | awk '/^Socket/{ print $2 }') * $(lscpu | awk '/^Core/{ print $4 }') ))
php-fpm settings
https://thisinterestsme.com/php-fpm-settings/
Top 10 processes uisng memory
ps auxw|head -1;ps auxw|sort -rn -k4|head -10
Get 20 Highest mem users.
echo [PID] [MEM] [PATH] && ps aux | awk '{print $2, $4, $11}' | sort -k2rn | head -n 20
Get highest cpu users.
ps -eo pcpu,pid,user,args | sort -k 1 -r | head -20
Apache tuning.
https://hostadvice.com/how-to/how-to-tune-and-optimize-performance-of-apache/
Estimate the Thrashing Point
https://www.liquidweb.com/kb/apache-performance-tuning-swap-memory/
ps aux | grep 'httpd' | awk '{print $6/1024;}' | awk '{sum += $1;} END {print sum " MB total mem usage";}'
ps aux | grep 'httpd' | awk '{print $6/1024;}' | awk '{avg += ($1 - avg) / NR;} END {print avg " MB avg mem usage";}'
Useful shell script commands.
https://www.lancaster.ac.uk/staff/tipper/writing/luui/html/unix-intro012.html
https://www.redhat.com/sysadmin/one-line-linux-commands
Make multiple directories in one command.
mkdir -p -v /home/josevnz/tmp/{dir1,anotherdir,similardir}
Make backup via encrypted transfer:
tar --create --directory /home/josevnz/tmp/ --file - *| \
ssh raspberrypi "tar --directory /home/josevnz \
--verbose --list --file -"
Find 10 largest directories.
du -sk /var/log/* | sort -r -n | head -10
Colorize Grep
grep -i --color=auto