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Editor to share with you how to use memory to check more than the set value to kill the php-fpm process. I hope you will learn a lot after reading this article. Let's discuss it together.

The company bought a source code before, but the engineer who wrote the source code did not consider it comprehensively at that time, and there was a problem in designing the database table structure. When the company's data reached hundreds of thousands of levels, the website was basically unable to run. The reason is that the query does not use the index, resulting in a large number of slow database queries, and there are many php-fpm processes running on the server at the same time. Almost ran out of server cpu and memory.

When the problem is located, the table structure is redesigned and the corresponding fields are indexed. After adding the index, there are still occasional cases where cpu and memory are running out. In this case, I wrote a shell script to monitor the server's memory usage, and once the default value is reached, kill all php-fpm processes and relieve the pressure on the server.

First, we need to get the memory usage of the server. Through free, you can get the total memory size and how much memory is used.

# free total used free shared buff/cache availableMem: 7999972 5432684 152496 2480 2414792 2284544Swap: 0 0 0

What we need is the Mem line, the total and the used item. We can get the memory usage of the current system through the grep and awk commands.

Free | grep-I mem | awk'{naughty _ 3 _ blank _ 2; printf ("% .0f", n * 100)}'

After you get the memory usage, compare it with the default value. When it is greater than the default value, all php-fpm processes in the system are killed. So the next job is to find out all the php-fpm processes in the system and how to kill them.

To get all the php-fpm processes on the system, you can use the ps command, and then filter with grep.

Ps aux | grep php-fpm | grep-v grep | grep-v masterwww 21210 0.00.1 157852 8596? S 19:33 0:00 php-fpm: pool wwwwww 21211 0.0 0.1 157852 8596? S 19:33 0:00 php-fpm: pool www...

All the php-fpm processes are obtained through the above command, and then we iterate through the information and kill the php-fpm process through the kill process number.

The complete shell script is shown below:

#! / bin/bash# memory check, more than 70%, kill all php-fpm processes MEM_LIM=70used=$ (free | grep-I mem | awk'{nemesis _ 3b _ blank _ 2X _ printf ("% .0f", nasty 100)}') if ((used > MEM_LIM)); then pids= `ps aux | grep php-fpm | grep-v grep | grep-v master | awk'{print $2} '`for pid in $pids do kill-9$ pid donefi

The above script is very simple, clear command. Here is a summary of what knowledge points are used by the script:

Free command to get memory utilization

The ps command gets all php-fpm processes

Kill command kills the process

Shell programming condition branch and loop structure

After reading this article, I believe you have a certain understanding of how to use memory to check more than the set value to kill the php-fpm process. If you want to know more about it, welcome to follow the industry information channel. Thank you for reading!

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