zabbix-php-fpm/README.md

# PHP-FPM Zabbix Template with Auto Discovery and Multiple Pools

![Zabbix version logo](https://img.shields.io/badge/Zabbix-v4.2+-green.svg?style=flat) ![PHP](https://img.shields.io/badge/PHP-5.6.x+-blue.svg?style=flat) ![PHP7](https://img.shields.io/badge/PHP7-supported-green.svg?style=flat) ![LLD](https://img.shields.io/badge/LLD-yes-green.svg?style=flat) ![ISPConfig](https://img.shields.io/badge/ISPConfig-supported-green.svg?style=flat)

![Banner](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/repository-open-graph-template.png)

## Main features

- Provides auto discovery of PHP-FPM pools (LLD)
- Detects pools that [listen](https://www.php.net/manual/en/install.fpm.configuration.php#listen) via socket and via TCP
- Supported types of PHP [process manager](https://www.php.net/manual/en/install.fpm.configuration.php#pm):
	- [x] dynamic
	- [x] static
	- [ ] ondemand - has some problems, because of its working logic, see issue [#11](https://github.com/rvalitov/zabbix-php-fpm/issues/11) 
- 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](https://www.ispconfig.org/)
- Script is in pure `bash`: no need to install `Perl`, `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](https://www.php.net/manual/en/install.fpm.configuration.php#pm).
    - **Slow Requests** - the number of requests that exceeded your [`request_slowlog_timeout`](https://www.php.net/manual/en/install.fpm.configuration.php#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
![Zabbix PHP-FPM connections graph](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/demo-connections.png)

Displays the following data:

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

#### CPU
![Zabbix PHP-FPM CPU utilization graph](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/demo-cpu.png)

Displays the following data:

- CPU average utilization in %
- Accepted connections per second

#### Memory
![Zabbix PHP-FPM RAM utilization graph](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/demo-memory.png)

Displays the following data:

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

#### Process
![Zabbix PHP-FPM CPU utilization graph](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/demo-process.png)

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.):

```bash
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):

```bash
apt-get -y install libfcgi0ldbl
```

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

```bash
apt-get -y install libfcgi-bin
```

##### For `yum` based environments (CentOS):

```bash
yum check-update
yum install grep gawk lsof jq fcgi
```

#### 1.2. Install Zabbix PHP-FPM template
Download the latest version of the template:

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

Unzip the archive:

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

Copy the required files to the Zabbix agent configuration directory:

```console
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:

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

#### 1.3. Root privileges
Automatic detection of pools requires root privileges. You can achieve it using one of the methods below.

##### 1.3.1 Root privileges for Zabbix Agent
This method sets root privileges 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 privileges to the PHP-FPM auto discovery script only
If you don't want to run Zabbix Agent as root, then you can configure the privileges only to our script. In this case you need to have `sudo` installed:

```console
apt-get install sudo
```

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

```console
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.

Now edit the file `userparameter_php_fpm.conf`. Find the line:

```
UserParameter=php-fpm.discover,/etc/zabbix/zabbix_php_fpm_discovery.sh
```

Add `sudo` there, so the line should be:

```
UserParameter=php-fpm.discover,sudo /etc/zabbix/zabbix_php_fpm_discovery.sh
```

That's all. 

#### 1.4. Linux Tuning (optional)
Usually PHP-FPM [backlog option](https://www.php.net/manual/en/install.fpm.configuration.php#listen-backlog) 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`:

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

Let's increase it to 1024:

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

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

```console
sysctl -p
```

#### 1.5. Adjust ISPConfig
This step is required only if you use [ISPConfig](https://www.ispconfig.org/).
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](https://www.ispconfig.org/blog/ispconfig-3-1-14p2-released-important-security-bugfix/), 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:

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

Set correct access rights:

```console
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":

![ISPConfig resync interface](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/ispconfig-resync.jpg)

### 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:

```console
service php7.3-fpm restart
```

#### 1.7. Clean up
Delete temporary files:

```console
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"`:
![Zabbix template import interface](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/zabbix-import.jpg)

Upload file `/zabbix/zabbix_php_fpm_template.xml` from the [archive](https://github.com/rvalitov/zabbix-php-fpm/archive/master.zip).

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

```console
root@server:/etc/zabbix#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 (you may want to use [online JSON tool](https://jsonformatter.curiousconcept.com/) for pretty formatting of the response):

```json
{
   "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"
      }
   ]
}
```

For further investigation you can run the script above with `debug` option to get more details, example:
```console
root@server:/etc/zabbix#bash /etc/zabbix/zabbix_php_fpm_discovery.sh debug
Debug mode enabled
Success: found socket /var/lib/php7.3-fpm/web1.sock for pool web1, raw process info: php-fpm7. 5094 web1 11u unix 0x00000000dd9ea858 0t0 104495372 /var/lib/php7.3-fpm/web1.sock type=STREAM
Success: found socket /var/lib/php7.3-fpm/web4.sock for pool web4, raw process info: php-fpm7. 5096 web4 11u unix 0x00000000562748dd 0t0 104495374 /var/lib/php7.3-fpm/web4.sock type=STREAM
Success: found socket /run/php/php7.3-fpm.sock for pool www, raw process info: php-fpm7. 5098 www-data 11u unix 0x00000000ef5ef2fb 0t0 104495376 /run/php/php7.3-fpm.sock type=STREAM
Resulting JSON data for Zabbix:
{"data":[{"{#POOLNAME}":"web1","{#POOLSOCKET}":"/var/lib/php7.3-fpm/web1.sock"},{"{#POOLNAME}":"web4","{#POOLSOCKET}":"/var/lib/php7.3-fpm/web4.sock"},{"{#POOLNAME}":"www","{#POOLSOCKET}":"/run/php/php7.3-fpm.sock"}]}
```

Any warning or error messages will be displayed here. 

**Note:** having a warning messages does not necessarily mean that you have a error here, because different OS may provide data about processes differently. So, if you don't see any error messages here, then the script works fine.

The script can 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 you can manually check that they do really exist and are running, for example, using command:

```console
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:

![Zabbix template import error details](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/zabbix-import-error.jpg)

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

## Test with `zabbix_get`
Please, use the [`zabbix_get`](https://www.zabbix.com/documentation/4.4/manual/concepts/get) utility from your Zabbix Server to test that you can get the data from the Zabbix Agent (host):

```console
zabbix_get -s 127.0.0.1 -p 10050 -k php-fpm.discover
zabbix_get -s 127.0.0.1 -p 10050 -k php-fpm.discover.status[POOL_URL,POOL_PATH]
``` 
In the above example we use the following values:

- `127.0.0.1` is the IP address of the host where the Zabbix Agent is installed and where the PHP-FPM is running
- `10050` is the port of the Zabbix Agent
- `POOL_URL` is the socket of the pool or IP and port combination, example: `/var/lib/php7.3-fpm/web1.sock` or `127.0.0.1:9000`
- `POOL_PATH` is the status path of PHP-FPM that you set in [`pm.status_path`](https://github.com/rvalitov/zabbix-php-fpm#16-adjust-php-fpm-pools-configuration), the default value is `/php-fpm-status`.

The commands above should return valid JSON data. If any error happens then it will be displayed. 

# 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](https://github.com/rvalitov/zabbix-php-fpm/issues/5).
 Not tested with other versions of Zabbix: if it works, please let me know.