zabbix-php-fpm/README.md

PHP-FPM Zabbix Template with Auto Discovery and Multiple Pools

Main features

• Supports auto discovery of PHP-FPM pools (LLD) and automatic detection of sockets used by pools
• Supports multiple PHP-FPM pools
• Supports multiple PHP versions, i.e. you can use PHP 7.2 and PHP 7.3 on the same server and we will detect them all
• Easy configuration
• Supports ISPConfig
• Script is in pure bash: no need to install Perl, PHP, Go or other languages.

Provided Items

We capture only useful data from host and PHP-FPM status page:

• Number of CPUs

• For each pool:

  • Accepted Connections Per Second - the number of requests accepted by the pool
  • Active Processes - the number of active processes
  • Idle Processes - the number of idle processes
  • Max Children Reached – the number of times, the process limit has been reached, when pm tries to start more children (works only for pm dynamic and ondemand)
  • CPU Utilization - CPU load for all processes of the pool in %
  • CPU Average Utilization - CPU load for all processes of the pool in % normalized by number of CPUs
  • Listen Queue - the number of requests in the queue of pending connections
  • Max Listen Queue - the maximum number of requests in the queue of pending connections since FPM has started
  • Listen Queue Length - the size of the socket queue of pending connections
  • Queue Utilization - queue usage in %
  • Memory Used - how much RAM used by the pool in bytes
  • Memory Utilization - how much RAM used by the pool in %
  • Process Manager - dynamic, ondemand or static, see PHP manual.
  • Slow Requests - the number of requests that exceeded your request_slowlog_timeout value.
  • Start Since - number of seconds since FPM has started
  • Start Time - the date and time FPM has started

History storage period is from 1 hour to 1 day (depends on specific item), trend storage period is 365 days that's optimal for environments with multiple websites. Data is captured every minute. These timings can be adjusted in template or per host if needed.

Provided Triggers

• Too many connections on pool
• PHP-FPM uses too much memory
• PHP-FPM manager changed
• PHP-FPM uses queue
• PHP-FPM detected slow request

Provided Graphs

Connections

Displays the following data:

• Accepted connections per second
• CPU average utilization in %
• Memory utilization in %
• Queue utilization in %

CPU

Displays the following data:

• CPU average utilization in %
• Accepted connections per second

Memory

Displays the following data:

• Memory used in bytes
• CPU average utilization in %
• Memory utilization in %
• Queue utilization in %

Process

Displays the following data:

• Active processes
• Idle processes
• Accepted connections per second

Queue

Displays the following data:

• Listen Queue

Max Children Reached

Displays the following data:

• Max Children Reached
• Accepted connections per second

Installation

1. On Zabbix agents

Perform the following operations on all servers with Zabbix and PHP-FPM from which you want to capture the data.

1.1. Install Prerequisites

Install required packages.

For apt-get based environments (Debian, Ubuntu, etc.):

apt-get update
apt-get -y install grep gawk lsof jq libfcgi0ldbl

Additionally, for Debian Jessie 8.x and earlier (or for equivalent Ubuntu version):

apt-get -y install libfcgi0ldbl

Additionally, for Debian Stretch 9.x and later (or for equivalent Ubuntu version):

apt-get -y install libfcgi-bin

For yum based environments (CentOS):

yum check-update
yum install grep gawk lsof jq fcgi

1.2. Install Zabbix PHP-FPM template

Download the latest version of the template:

wget https://github.com/rvalitov/zabbix-php-fpm/archive/master.zip -O /tmp/zabbix-php-fpm.zip

Unzip the archive:

unzip /tmp/zabbix-php-fpm.zip -d /tmp

Copy the required files to the Zabbix agent configuration directory:

cp /tmp/zabbix-php-fpm-master/zabbix/userparameter_php_fpm.conf /etc/zabbix/zabbix_agentd.d/
cp /tmp/zabbix-php-fpm-master/zabbix/zabbix_php_fpm_discovery.sh /etc/zabbix/
cp /tmp/zabbix-php-fpm-master/zabbix/zabbix_php_fpm_status.sh /etc/zabbix/

Configure access rights:

chmod +x /etc/zabbix/zabbix_php_fpm_discovery.sh
chmod +x /etc/zabbix/zabbix_php_fpm_status.sh

1.3. Root previliges

Automatic detection of pools requires root previliges. You can achieve it using one of the methods below.

1.3.1 Root previliges for Zabbix Agent

This method sets root previliges for Zabbix Agent, i.e. the Zabbix Agent will run under root user, as a result all user scripts will also have the root access rights.

Edit Zabbix agent configuration file /etc/zabbix/zabbix_agentd.conf, find AllowRoot option and enable it:

### Option: AllowRoot
#       Allow the agent to run as 'root'. If disabled and the agent is started by 'root', the agent
#       will try to switch to the user specified by the User configuration option instead.
#       Has no effect if started under a regular user.
#       0 - do not allow
#       1 - allow
#
# Mandatory: no
# Default:
# AllowRoot=0
AllowRoot=1

1.3.2 Grant previliges to the PHP-FPM autodiscovery script only

If you don't want to run Zabbix Agent as root, then you can configure the previliges only to our script. In this case you need to have sudo installed:

apt-get install sudo

Now edit the /etc/sudoers file by running command:

visudo

Add the following line to this file:

zabbix ALL = NOPASSWD: /etc/zabbix/zabbix_php_fpm_discovery.sh

Here we specified zabbix as the user under which the Zabbix Agent is run. This is the default name, but if you have a custom installation with different name, then please, change it accordingly. Save and exit the editor. Your modifications will be applied.

1.4. Linux Tuning (optional)

Usually PHP-FPM backlog option is limited by Linux kernel settings and equals to 128 by default. In most cases you want to increase this value (latest PHP use 511 by default). The main option that limits the PHP-FPM backlog option is net.core.somaxconn. See the current setting, usually it's 128:

cat /proc/sys/net/core/somaxconn
128

Let's increase it to 1024:

echo "net.core.somaxconn=1024" >> /etc/sysctl.conf

Now we can cause the settings to be loaded by running:

sysctl -p

1.5. Adjust ISPConfig

This step is required only if you use ISPConfig. ISPConfig does not enable PHP-FPM status page by default. We will enable it by adding a custom PHP-FPM configuration template. This file is an original configuration file from ISPConfig v.3.1.14p2, it only enables the status page by adding the following line:

pm.status_path = /php-fpm-status

Copy the configuration file into ISPConfig custom configuration directory:

cp /tmp/zabbix-php-fpm/ispconfig/php_fpm_pool.conf.master /usr/local/ispconfig/server/conf-custom/

Set correct access rights:

chmod +x /usr/local/ispconfig/server/conf-custom/php_fpm_pool.conf.master

Now resync the websites using ISPConfig control panel: go to "Tools"->"Sync Tools"->"Resync". Check "Websites" only and click "Start":

1.6 Adjust PHP-FPM pools configuration

This step is required if you don't use ISPConfig. In this case you need to enable the PHP-FPM status page for all of your pools manually. Each pool must have the same status path, recommended value is /php-fpm-status. Please, edit all the pools configuration files (for example for PHP 7.3 they are located in directory /etc/php/7.3/fpm/pool.d) by adding the following line:

pm.status_path = /php-fpm-status

You can set another path here if needed. Finally, restart the PHP-FPM, for example:

service php7.3-fpm restart

1.7. Clean up

Delete temporary files:

rm /tmp/zabbix-php-fpm.zip
rm -rf /tmp/zabbix-php-fpm-master/

2. On Zabbix Server

2.1. Import Zabbix PHP-FPM template

In Zabbix frontend go to "Configuration"->"Templates"->"Import":

Upload file /zabbix/zabbix_php_fpm_template.xml from the archive.

2.2. Add the template to your hosts

Add template "Template App PHP-FPM" to the desired hosts. If you use a custom status path, then configure it in the macros section of the host by adding value:

{$PHP_FPM_STATUS_URL}=your status path

The setup is finished, just wait a couple of minutes till Zabbix discovers all your pools and captures the data.

Testing and Troubleshooting

Check autodiscovery

First test that autodiscovery of PHP-FPM pools works on your machine. Run the following command:

bash /etc/zabbix/zabbix_php_fpm_discovery.sh

Important: please make sure that you use bash in the command above, not sh or other alternatives, otherwise you may get a script syntax error message.

The output should be a valid JSON with a list of pools and their sockets, something like below:

{
   "data":[
      {
         "{#POOLNAME}":"web1",
         "{#POOLSOCKET}":"/var/lib/php7.3-fpm/web1.sock"
      },
      {
         "{#POOLNAME}":"web4",
         "{#POOLSOCKET}":"/var/lib/php7.3-fpm/web4.sock"
      },
      {
         "{#POOLNAME}":"www",
         "{#POOLSOCKET}":"127.0.0.1:9000"
      }
   ]
}

If this script does not display the list, then it will show you the list of utilities that are missing on your system and must be installed. We require the following utilities to be installed:

• awk
• ps
• grep
• sort
• head
• lsof
• jq

If some pools are missing, then check that they do really exist and are running, for example, using command:

ps aux | grep "php-fpm"

In the list you should see your pool. If it's not there, then it means it's not running (not functional).

How to troubleshoot template import failure

To view the import errors, please click the "Details" section in the Zabbix GUI. It should be on the same import page near the error message:

Then check the Zabbix server log, for Debian/Ubuntu it's located at /var/log/zabbix/zabbix_server.log.

Compatibility

Tested with:

• PHP 7.3
• Zabbix 4.2.5
• ISPConfig v.3.1.14p2

Should work with PHP 5.6.x and later, Zabbix 4.2.x and later. Currently the template does not work with Zabbix 4.0.x, see issue. Not tested with other versions of Zabbix: if it works, please let me know.