php fpm restart nginx ubuntu enable status page, monitor etc

php-fpm7.4 -t

 

root@localhost:~# php-fpm7.4 -t
[30-Jul-2021 17:05:34] NOTICE: configuration file /etc/php/7.4/fpm/php-fpm.conf test is successful

root@murali:~# php-fpm8.1 -t
[18-Jul-2023 04:29:08] NOTICE: configuration file /etc/php/8.1/fpm/php-fpm.conf test is successful

service php7.4-fpm restart

service php7.4-fpm reload

root@localhost:~# service php7.4-fpm reload
root@localhost:~#

or

systemctl restart php7.4-fpm

systemctl reload php7.4-fpm

systemctl start php7.4-fpm

systemctl stop php7.4-fpm

or

systemd restart php7.4-fpm

systemd reload php7.4-fpm

systemd start php7.4-fpm

systemd stop php7.4-fpm

Prerequisites:

#1: understand php – fpm pool configuration

nano /etc/php/7.3/fpm/pool.d/www.conf

uncoment

pm.status /status

check for syntax errors & restart php fpm

sudo php7.3-fpm -t && sudo systemctl restart php7.3-fpm

$ sudo nano /etc/nginx/conf.d/default.conf

location ~ ^/(status|ping)$ {

        allow 127.0.0.1;

        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

        fastcgi_index index.php;

        include fastcgi_params;

        #fastcgi_pass 127.0.0.1:9000;

        fastcgi_pass   unix:/var/run/php7.3-fpm.sock;

}

$ sudo systemctl restart nginx

nginx -s reload

or

domain/status

pool:                 www
process manager:      dynamic
start time:           02/Apr/2021:19:16:20 +0000
start since:          1589136
accepted conn:        189184
listen queue:         0
max listen queue:     19
listen queue len:     65536
idle processes:       15
active processes:     1
total processes:      16
max active processes: 31
max children reached: 0
slow requests:        0

************************
pid:                  28970
state:                Idle
start time:           17/Apr/2021:05:04:18 +0000
start since:          344258
requests:             2510
request duration:     108062
request method:       POST
request URI:          /wp-admin/admin-ajax.php
content length:       6490
user:                 -
script:               /var/www/html/rajuginni.com/wp-admin/admin-ajax.php
last request cpu:     74.03
last request memory:  2097152

************************
pid:                  28874
state:                Idle
start time:           17/Apr/2021:04:51:08 +0000
start since:          345048
requests:             2541
request duration:     114807
request method:       GET
request URI:          /index.php
content length:       0
user:                 -
script:               /var/www/html/raju/index.php
last request cpu:     60.97
last request memory:  2097152

************************
pid:                  2205
state:                Idle
start time:           20/Apr/2021:11:57:32 +0000
start since:          60264
requests:             425
request duration:     355489
request method:       POST
request URI:          /wp-cron.php?doing_wp_cron=1618980078.5080909729003906250000
content length:       0
user:                 -
script:               /var/www/html/sarkariresultz.in/wp-cron.php
last request cpu:     61.89
last request memory:  12582912

************************
pid:                  28951
state:                Idle
start time:           17/Apr/2021:05:03:05 +0000
start since:          344331
requests:             2522
request duration:     130015
request method:       POST
request URI:          /wp-admin/admin-ajax.php
content length:       67
user:                 -
script:               /var/www/html/rajuginni.com/wp-admin/admin-ajax.php
last request cpu:     69.22
last request memory:  2097152

************************
pid:                  28964
state:                Idle
start time:           17/Apr/2021:05:04:16 +0000
start since:          344260
requests:             2512
request duration:     384968
request method:       GET
request URI:          /index.php
content length:       0
user:                 -
script:               /var/www/html/sarkariresultz.in/index.php
last request cpu:     77.93
last request memory:  31457280

************************
pid:                  28975
state:                Idle
start time:           17/Apr/2021:05:04:23 +0000
start since:          344253
requests:             2502
request duration:     5912
request method:       GET
request URI:          /index.php
content length:       0
user:                 -
script:               /var/www/html/jojowealth.com/index.php
last request cpu:     169.15
last request memory:  2097152


************************
pid:                  28859
state:                Running
start time:           17/Apr/2021:04:50:59 +0000
start since:          345057
requests:             2540
request duration:     3227
request method:       GET
request URI:          /status?full
content length:       0
user:                 -
script:               -
last request cpu:     0.00
last request memory:  0

json,xml options available to pull the data

pool	www
process manager	dynamic
start time	14/Jul/2020:16:12:35 +0000
start since	43224     // number of seconds since the process has started.
accepted conn	3384    // accepted request from nginx
listen queue	current ques
max listen queue	maximum queue still server start  requests in the queue of pending connections
listen queue len	maximum length 65536 .. sysctl conf has to modify
idle processes	2
active processes	1
total processes	3
max active processes	3    // max active processes still the server started
max children reached	0  // how many times its reached max process increase (php fpm pool configuration)
slow requests	0   // you have enable first also available at /var/log/phpslow

request duration – in microseconds (1000th of milli second)
request method – GET, POST,
request URI – request URI with the query string.
content length – content length of the request (only with POST).
user – user (PHP_AUTH_USER) (or ‘-‘ if not set).
script – main script called (or ‘-‘ if not set).
last request cpu – %cpu the last request consumed (note that it’s always 0 if the process is not in Idle state).
last request memory – max amount of memory the last request consumed

php -fpm is a single thread application just like nginx and redis but mysql multi threaded.

maximum number of requests queued for processed until server restart.

how many times php-fpm reached its limit.

if reached you can increase child process limits.

by cost memory.

total 5 severs.

3 process reached per seconds.(3 concurrent request per second)

most of wp pages served by fastcgi cache nginx. or cloudflare proxy.

mysql connections per seconds should higher than php-fpm max children per second.

also monitor  nginx connections per second With nginx stub status module (not in core)

edit www.conf

threshold should be 1sec

slow query log path

uncomment all

restart or reload php fpm

then you see slow queries in php fpm status page.

Sudo service php-fpm restart

sudo service php7.4-fpm restart

sudo service php8.0-fpm restart

systemctl restart php7.4-fpm

CGI and FastCGI are two protocols not specific to PHP:

CGI scripts is a way how to run a server side script (not only PHP!) when a HTTP request arrives. In this setup, the web server launches a new CGI process for every incoming request, causing significant performance overhead.

FastCGI is a “better CGI” – to address the limitations of CGI, the FastCGI runs as a server (TCP or UNIX), so that resources can be reused across requests.

PHP-FPM is PHP’s FastCGI implementation – works with apache  enable mod_fastcgi and disable mod_php.

PHP-FPM has a very useful built-in status page. You can access it over web and also write scripts to monitor your PHP-FPM sites health remotely.

just check status of php -fpm status

sudo service php7.4-fpm status

root@-s-4vcpu-8gb-blr1-01:~# sudo service php7.4-fpm status
● php7.4-fpm.service – The PHP 7.4 FastCGI Process Manager
Loaded: loaded (/lib/systemd/system/php7.4-fpm.service; enabled; vendor prese
Active: active (running) since Fri 2021-04-02 19:16:20 UTC; 2 weeks 4 days ag
Docs: man:php-fpm7.4(8)
Process: 28325 ExecStopPost=/usr/lib/php/php-fpm-socket-helper remove /run/php
Process: 28369 ExecStartPost=/usr/lib/php/php-fpm-socket-helper install /run/p
Main PID: 28327 (php-fpm7.4)
Status: “Processes active: 0, idle: 16, Requests: 189467, slow: 0, Traffic: 0
Tasks: 17 (limit: 4915)
CGroup: /system.slice/php7.4-fpm.service
├─ 1338 php-fpm: pool www
├─ 2202 php-fpm: pool www
├─ 2205 php-fpm: pool www
├─ 2206 php-fpm: pool www
├─28327 php-fpm: master process (/etc/php/7.4/fpm/php-fpm.conf)
├─28859 php-fpm: pool www
├─28868 php-fpm: pool www
├─28869 php-fpm: pool www
├─28874 php-fpm: pool www
├─28881 php-fpm: pool www
├─28951 php-fpm: pool www
├─28964 php-fpm: pool www
├─28970 php-fpm: pool www
lines 1-23

sudo service php-fpm status (not works because you need version) so use grep command

root@-s-4vcpu-8gb-blr1-01:~# ps aux | grep php
www-data 1338 0.1 5.5 918960 454568 ? S Apr17 6:35 php-fpm: pool www
www-data 2202 0.1 4.9 906464 401556 ? S Apr20 1:22 php-fpm: pool www