What to do if there are too many php fpm processes in CentOS 7

Solution to too many php fpm processes: first check the total number of php processes; then list the top 50 processes that consume the most memory; then optimize "php-fpm" by modifying the configuration file; finally restart the server. Can.

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Solve the problem of too many php-fpm processes in CentOS 7 Many problems lead to large consumption of server memory resources

What is php-fpm:

php-fpm is the FastCGI process manager, which is used to control the memory and processes of php.

Operating environment:

CentOS 7

Problem check:

First check the total number of php processes:

pstree|grep php-fpm

Echo:

|-php-fpm---20*[php-fpm]

According to the echo information, there are 20 php-fpm processes during the query.

You can also use the following command to list the top 50 processes that consume the most memory:

ps auxw|head -1;ps auxw|sort -rn -k4|head -50

Solution process:

Next we optimize php-fpm by modifying the configuration file , to achieve the purpose of reducing memory usage.

My php-fpm configuration file is in the .../server/php/etc/ directory, enter this directory.

Back up the original configuration file first:

cp php-fpm.conf php-fpm.conf.bak

Note: After using vim to open the configuration file, press the Esc key, then enter "/", and then enter "xxx" to search for "xxx" String.

The specific configuration parameters are as follows:

pm.max_children = 100改为：pm.max_children = 25
pm.start_servers = 20改为pm.start_servers = 5
pm.min_spare_servers = 5改为pm.min_spare_servers = 2
pm.max_spare_servers = 35改为pm.max_spare_servers = 10

Restart the server:

reboot

After restarting, you can find that the memory usage is lower than before.

Note:

Explanation of the role of parameters in php-fpm.conf:

pm.max_children: The number of php-fpm processes opened in static mode.

pm.start_servers: The number of starting php-fpm processes in dynamic mode.

pm.min_spare_servers: The minimum number of php-fpm processes in dynamic mode.

pm.max_spare_servers: The maximum number of php-fpm processes in dynamic mode.

When making the above settings, I set the execution mode of php-fpm to dynamic:

pm = dynamic

php-fpm has two execution modes:

One is Static and the other is Dynamic. If set to static, only the pm.max_children parameter will take effect. If set to dynamic, the three parameters pm.start_servers, pm.min_spare_servers and pm.max_spare_servers will take effect. After setting it to dynamic, when php-fpm starts, it will start the corresponding number of processes according to the parameter setting of pm.start_servers. After that, the number of processes of php-fpm will be maintained between the number specified by pm.min_spare_servers and pm.max_spare_servers.

How to choose to use the static or dynamic execution mode of php-fpm:

The dynamic php-fpm execution mode allows php-fpm to release redundant processes, thus saving memory resources.

The static php-fpm execution method does not allow php-fpm to release more than processes, which avoids frequently starting or stopping the php-fpm process, thereby reducing the server's response time in some cases.

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