PHP-FPM log to syslog

gistfile1.txt

/etc/php5/fpm/php-fpm.conf

    error_log = syslog
    syslog.ident = php-fpm

This will log to syslog PHP-FPM stuff that usually gets logged to /var/log/php5-fpm.log and is not that interesting:

    ... php-fpm[3537]: [NOTICE] fpm is running, pid 3537
    ... php-fpm[3537]: [NOTICE] ready to handle connections
    ... php-fpm[3537]: [NOTICE] Finishing ...
    ... php-fpm[3537]: [NOTICE] exiting, bye-bye!
    ... php-fpm[3573]: [NOTICE] fpm is running, pid 3573
    ... php-fpm[3573]: [NOTICE] ready to handle connections
    ... php-fpm[3573]: [NOTICE] Finishing ...
    ... php-fpm[3573]: [NOTICE] exiting, bye-bye!
    ... php-fpm[3607]: [NOTICE] fpm is running, pid 3607
    ... php-fpm[3607]: [NOTICE] ready to handle connections

What we want is to log all of the errors (and warnings and notices) to syslog.

For CLI scripts we do that by creating /etc/php5/cli/conf.d/99-custom.ini with:
    
    error_log = syslog

PHP scripts ran from CLI will now log to syslog but will use "php" as syslog ident.

By setting "error_log = syslog" in /etc/php5/fpm/conf.d/99-custom.ini errors that happen during processing of php scripts via PHP-FPM will end up in syslog but the ident will be "ool <NAME-OF-THE-POOL>". So if you use a pool named www you will get messages into syslog with an ident of "ool www".

To change the syslog ident you have to run:

    openlog('desired-ident', LOG_ODELAY, LOG_USER)

somewhere in the beginning of your scripts. The other option is to auto prepend the file with the following content:

```php
    <?php
        openlog('desired-ident', LOG_ODELAY, LOG_USER)
```

Save it under /etc/php5/fpm/syslog_prepend.php and at the end of your pool definition (eg. /etc/php5/fpm/pool.d/www.conf) add:

    php_admin_value[auto_prepend_file] = /etc/php5/fpm/syslog_prepend.php

This way this file will be automatically prepended to every request that comed to PHP-FPM.

Links:

    * https://bugs.php.net/bug.php?id=67764
    * http://php.net/manual/en/errorfunc.configuration.php#116235
    * http://stackoverflow.com/a/22580875