With FPM you can run several pools of processes with different setting.
These are settings that can be tweaked per pool.
-
listen
string
-
The address on which to accept FastCGI requests. Valid syntaxes are:
'ip.add.re.ss:port', 'port', '/path/to/unix/socket'. This option is
mandatory for each pool.
-
listen.backlog
int
-
Set listen(2) backlog. A value of '-1' means unlimited. Default value:
-1.
-
listen.allowed_clients
string
-
List of IPv4 addresses of FastCGI clients which are allowed to
connect. Equivalent to the FCGI_WEB_SERVER_ADDRS environment variable in the
original PHP FastCGI (5.2.2+). Makes sense only with a tcp listening socket.
Each address must be separated by a comma. If this value is left blank,
connections will be accepted from any ip address. Default value: any.
IPv6 addresses are allowed since PHP 5.5.20 and 5.6.4.
-
listen.owner
string
-
Set permissions for unix socket, if one is used. In Linux, read/write
permissions must be set in order to allow connections from a web
server. Many BSD-derived systems allow connections regardless of permissions.
Default values: user and group are set as the running user, mode is set to 0660.
-
listen.group
string
-
See listen.owner.
-
listen.mode
string
-
See listen.owner.
-
listen.acl_users
string
-
When POSIX Access Control Lists are supported you can set them using this option.
When set, listen.owner and listen.group
are ignored. Value is a comma separated list of user names. Since PHP 5.6.5.
-
listen.acl_groups
string
-
See listen.acl_users.
Value is a comma separated list of group names. Since PHP 5.6.5.
-
user
string
-
Unix user of FPM processes. This option is mandatory.
-
group
string
-
Unix group of FPM processes. If not set, the default user's group is
used.
-
pm
string
-
Choose how the process manager will control the number of child
processes. Possible values: static, ondemand,
dynamic.
This option is mandatory.
static - the number of child processes is fixed (pm.max_children).
ondemand - the processes spawn on demand (when requested,
as opposed to dynamic, where pm.start_servers are started
when the service is started.
dynamic - the number of child processes is set dynamically based on the
following directives: pm.max_children, pm.start_servers,
pm.min_spare_servers, pm.max_spare_servers.
-
pm.max_children
int
-
The number of child processes to be created when pm is set to
static and the maximum number of child processes to be created
when pm is set to dynamic. This
option is mandatory.
This option sets the limit on the number of simultaneous requests that
will be served. Equivalent to the ApacheMaxClients directive with
mpm_prefork and to the PHP_FCGI_CHILDREN environment variable in the
original PHP FastCGI.
-
pm.start_servers
int
-
The number of child processes created on startup.
Used only when pm is set to dynamic.
Default Value: min_spare_servers + (max_spare_servers -
min_spare_servers) / 2.
-
pm.min_spare_servers
int
-
The desired minimum number of idle server processes. Used only when
pm is set to dynamic. Also
mandatory in this case.
-
pm.max_spare_servers
int
-
The desired maximum number of idle server processes. Used only when
pm is set to dynamic. Also
mandatory in this case.
-
pm.max_requests
int
-
The number of requests each child process should execute before
respawning. This can be useful to work around memory leaks in 3rd party
libraries. For endless request processing specify '0'. Equivalent to
PHP_FCGI_MAX_REQUESTS. Default value: 0.
-
pm.status_path
string
-
The URI to view the FPM status page. If this value is not set, no URI
will be recognized as a status page. Default value: none.
-
ping.path
string
-
The ping URI to call the monitoring page of FPM. If this value is not
set, no URI will be recognized as a ping page. This could be used to test
from outside that FPM is alive and responding. Please note that the value must
start with a leading slash (/).
-
ping.response
string
-
This directive may be used to customize the response to a ping
request. The response is formatted as text/plain with a 200 response code.
Default value: pong.
-
request_terminate_timeout
mixed
-
The timeout for serving a single request after which the worker
process will be killed. This option should be used when the 'max_execution_time'
ini option does not stop script execution for some reason. A value of '0' means
'Off'. Available units: s(econds)(default), m(inutes), h(ours), or d(ays).
Default value: 0.
-
request_slowlog_timeout
mixed
-
The timeout for serving a single request after which a PHP backtrace
will be dumped to the 'slowlog' file. A value of '0' means 'Off'.
Available units: s(econds)(default), m(inutes), h(ours), or d(ays).
Default value: 0.
-
slowlog
string
-
The log file for slow requests. Default value:
#INSTALL_PREFIX#/log/php-fpm.log.slow.
-
rlimit_files
int
-
Set open file descriptor rlimit for child processes in this pool. Default value: system defined value.
-
rlimit_core
int
-
Set max core size rlimit for child processes in this pool. Possible Values: 'unlimited' or an integer greater or equal to 0.
Default value: system defined value.
-
chroot
string
-
Chroot to this directory at the start. This value must be defined as
an absolute path. When this value is not set, chroot is not used.
-
chdir
string
-
Chdir to this directory at the start. This value must be an absolute
path. Default value: current directory or / when chroot.
-
catch_workers_output
boolean
-
Redirect worker stdout and stderr into main error log. If not set,
stdout and stderr will be redirected to /dev/null according to FastCGI specs.
Default value: no.
-
clear_env
boolean
-
Clear environment in FPM workers.
Prevents arbitrary environment variables from reaching FPM worker processes
by clearing the environment in workers before env vars specified in this
pool configuration are added. Since PHP 5.4.27, 5.5.11, and 5.6.0.
Default value: Yes.
-
security.limit_extensions
string
-
Limits the extensions of the main script FPM will allow to parse.
This can prevent configuration mistakes on the web server side.
You should only limit FPM to .php extensions to prevent malicious
users to use other extensions to execute php code.
Default value: .php.
It's possible to pass additional environment variables and update PHP settings of a certain pool.
To do this, you need to add the following options to the pool configuration file.