wp media regenerate for adding missing image formats & limiting virtual memory and cpu core usage #wpcli #bash #imageregeneration

wp-regenerate-w-limited-resources.sh

# use wp cli to regenerate missing image formats while limiting RAM and CPU usage so server does not die on you during the ride
# check whether virtual memory has been set for this bash session
ulimit -v 2097152 
# check whether virtual memory has been set for this bash session
ulimit -v 
# install cpu limit application on debian / ubuntu
sudo apt install cpulimit
# run command to regenerate missing thumbnails with virtual memory and only half a cpu core
cpulimit -l 50 -- wp media regenerate --yes --only-missing  

If issues arise and you cannot stop wp cli, log out and in , check for wp

ps aux |grep wp

Then use kill -9 process-id. Process ID is the number in the second column

also had chmod issues so had to

sudo chown -R www-data:www-data /var/www/site.com/public_html/
sudo find /var/www/site.com/public_html/ -type d -exec chmod g+s {} \;

for user ubuntu in group www-data to be able to run command to generate the thumbnails without running into chmod issues