Ok My site is working fine but when the number of visitors increases it breaks suddenly.To find out why it breaks I have been observing the behaviour of my server using the ‘htop’ command.
Using ‘htop’ I noticed that whenever the second value in the figure,
code Tasks 136 , 100 , 2 running
reaches 166 my site breaks,I get something like " 502 Gateway error" .The problem seems to be not coming from RAM because the RAM usage is just 4 to 5 GB but I have 16GB RAM.And also the CPU usage never reaches 100%.So where is the problem coming from? can anyone help me please!
My Server is information:
16GB RAM, 320 GB storage , 6 CPU
My NGinx configuration is :
worker_processes 6;
worker_connections 2000;
My PHP fpm configuration is :
pm = ondemand
pm.max_children = 100
pm.start_servers = 18
pm.min_spare_servers = 9
pm.max_spare_servers = 18
pm.process_idle_timeout = 10s;
pm.max_requests = 500
Am I missing something,I also use WP Super cache!!
Any help will be grateful,thank you in advance.
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I had the same issue and solved it by adding a SWAP to my droplet following “How To Add Swap Space on Ubuntu 20.04”
It’s happening because your max_connections is being reached. Run these commands and copy/paste the output here:
On the last command, you might need to run it like this:
Increase max_children to 150 and restart fpm. Also, check the php-fpm error log. It should have further clues on why it’s failing.