What is Mod_ISAPI? Configuration File Path? Ideal VALUES FOR /etc/httpd/conf/conf.d/lsapi.conf | Web Hosting | Domain Registration | Wordpress Hosting | SSL Certificates

What is Mod_ISAPI? Configuration File Path? Ideal VALUES FOR /etc/httpd/conf/conf.d/lsapi.conf

General Mod_ISAPI Errors and Resolutions:

Error 1: Reached max children process limit

The apache error log shows:

Reached max children process limit: 80, extra: 0, current: 80, please increase LSAPI_CHILDREN.


Solution:

I increased it here:
/etc/httpd/conf/conf.d/lsapi.conf

and restarted apache (service httpd rtstart) so the error was removed.



Error 2(Error receiving response header (lsphp is killed?):


[Wed Oct 28 10:04:49.506913 2015] [lsapi:error] [pid 796150] [client 217.165.79.204:4274] [host www.domain.com] Error receiving response header (lsphp is killed?): ReceiveResponseHeader: receive pkg hdr failed: ReceiveLSHeader: nothing to read from backend socket, referer: http://www.domain.com/

Solution:

Fixed. I've updated mod_lsapi to the latest version and changed some of its parameters in config /etc/httpd/conf/conf.d/lsapi.conf (lsapi_backend_max_process_time- from 300 to 3600, lsapi_terminate_backends_on_exit -to Off). Now site works (please see attachment).



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Apache mod_lsapi

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[beta]

Apache mod_lsapi is a module based on LiteSpeed Technologies API for PHP, Ruby and Python. It offers excellent PHP performance, low memory footprint coupled with great security and support for opcode caching.

How it works

mod_lsapi is a part of Apache;
Apache passes handling for PHP request to mod_lsapi;
mod_lsapi uses liblsapi to transfers request lsphp daemon;
lsphp processes request and return data to mod_lsapi;
Each user has lsphp processes in separate CageFS/LVE;
If there is no requests for lsapi_backend_pgrp_max_idle seconds, lsphp process is terminated;
If no lsphp processes available when new request comes, new lsphp process is created;
lsphp can process lsapi_backend_children requests simultaneously.


mod_lsapidiagrammNEW

What is lsphp

lsphp - PHP + LSAPI. What is LSAPI? LiteSpeed Server Application Programming Interface (LSAPI) is designed specifically for seamless, optimized communication between LiteSpeed Web Server and third party web applications. Now this protocol is available for Apache 2.2/2.4.

Using LSAPI, we have seen higher performance than Apache with mod_php, easier installation than php-fpm and easier integration with any control panel. LSAPI means faster and more stable dynamic web pages.

Requirements

CageFS (installed and initialized)
Alt-PHP
Apache with SuExecuUserGroup directive for each user's VirtualHost,
mod_ruid2 disabled
apache itk disabled

Configuration Options

Options
Description
Level
php_value, php_admin_value, php_flag, php_admin_flag
mod_php emulation
httpd.conf, virtualhost, htaccess
lsapi_backend_connect_timeout
number of usec to wait while lsPHP starts (if not started on request)
httpd.conf
lsapi_backend_connect_tries
number of retries to connects to lsPHP daemon
httpd.conf
lsapi_terminate_backends_on_exit
httpd.conf, On - stop lsphp services on apache restart, Off - leave live started lsphp services on apache restart (for php+opcache). The lsphp will not restart, even if Apache gets restarted.
httpd.conf
lsapi_backend_children
sets env variable LSAPI_CHILDREN
# lsphp also try to read PHP_LSAPI_CHILDREN var
# Required and should be >0 in order to enter into self-managed mode
# min value is 1; max value is 10000. if var value is more, 10000 will be used.
httpd.conf
lsapi_backend_max_process_time
env variable LSAPI_MAX_PROCESS_TIME
# Optional. Default value is 3600
# Timeout to kill runaway processes
httpd.conf
lsapi_backend_pgrp_max_idle
sets evn variable LSAPI_PGRP_MAX_IDLE, in seconds
controls how long an control process will wait for
# a new request before it exits.
# Optional, default value is 0 -> infinite
# export LSAPI_PGRP_MAX_IDLE=0

httpd.conf
lsapi_debug
enable debugging for mod_lsapi, acceptable values: on/off
httpd.conf
lsapi_socket_path

Path to back end lsphp sockets. By default /tmp/lshttpd

httpd.conf
lsapi_phprc
Sets PHPRC env variaable
httpd.conf, virtualhost
lsapi_user_group
Set user & group for requests

httpd.conf, virtualhost, directory

lsapi_uid_gid

Set user id & group id for requests

httpd.conf, virtualhost, directory
lsapi_use_default_uid

Use default apache UID/GID if no uid/gid set. Values: On/Off. If Off, and no UID/GID set, error 503 will be returned. Default - Off


httpd.conf
lsapi_target_perm
check target PHP script permissions. If set to On, lsapi will check that script is owned by the same user, as user under which it is being executed. Return 503 error if they don't match. Default: Off
httpd.conf
lsapi_selfstarter
Use or not separate process for staring lsphp. By default is - On. For apache prefork can be used parameter Off (because of low level virtual memory usage by apache prefork), but for event and worker should be - On (because high level of virtual memory usage by event and worker).  Acceptable values: on/off.

httpd.conf
lsapi_poll_timeout
By deafult - 0 (infinity). For preventing long running processes which can use EP (limit number of entry processes). In seconds - time to wait response from lsphp daemon.

httpd.conf
lsapi_mutex_mech
Default value is “default” (experimental option yet, for checking problem with semaphores). Values: default, fcntl, flock, posixmem, pthread, sysvsem.
httpd.conf
lsapi_backend_coredump
env variable LSAPI_ALLOW_CORE_DUMP (On or Off). Pass LSAPI_ALLOW_CORE_DUMP to lsphp or not. If it will be passed - core dump on lsphp crash will be created.
# Off by default
# By default a LSAPI application will not leave a core dump file when crashed. If you want to have # LSAPI PHP dump a core file, you should set this environment variable. If set, regardless the # value has been set to, core files will be created under the directory that the PHP script in.
LSAPI_ALLOW_CORE_DUMP
httpd.conf
lsapi_mod_php_behaviour
On/Off - disable php_* directives, default On.
httpd.conf, virtualhost, htaccess
lsapi_with_connection_pool
On/Off - disable enable connect pool, default Off
httpd.conf

Example configuration

LoadModule lsapi_module modules/mod_lsapi.so
 
<IfModule lsapi_module>
  AddType application/x-httpd-lsphp .php
  lsapi_backend_connect_timeout 100000
  lsapi_backend_connect_tries 10
  lsapi_backend_children 20
  lsapi_backend_pgrp_max_idle 30
  lsapi_backend_max_process_time 300
  lsapi_debug Off
</IfModule>

Secret File

When installed, liblsapi will automatically create secret file used by mod_lsapi to communicate with backend:
/etc/sysconfig/modlsapi.secret
owner root:root
perms: 400
for making security pass PHPRC and UID|GID on start lsphp
Algorithm of creating:
/bin/dd if=/dev/random of=/etc/sysconfig/modlsapi.secret bs=16 count=1


Command Line Tools (cPanel only)

Use the following syntax to manage MODLSAPI istall utility:
/usr/bin/switch_mod_lsapi [OPTIONS]
Options:
--setup - setup mod_lsapi configurations for apache
--uninstall - uninstall mod_lsapi from apache
--enable-domain - enable mod_lsapi for individual domain
--disable-domain - disable mod_lsapi for individual domain
--enable-global - sets up mod_lsapi as a default way to serve PHP, making it enabled for all domains. Once that mode is enabled, you cannot disable mod_lsapi for individual domain
--disable-global - disable mod_lsapi  as a default way to serve PHP, disabling mod_lsapi for all domains, including those selected previously using --enable-domain
--build-native-lsphp - build native lsphp for cPanel

This tool:
at the moment, works only with cPanel
creates native lsphp (if it doesn't exist) by doing: cp /opt/alt/php54/usr/bin/lsphp /usr/local/bin/
creates /tmp/lshttpd and adds it to /etc/cagefs/cagefs.mp
Removes config template for mod_ruid2
Configures Apache handler application/x-httpd-lsphp
Switch domain to lsphp or enable global lsphp
For cPanel can build native lsphp

What commands are available for different control panels:


No CP
cPanel
DirectAdmin
Plesk
InterWorx
ISPManager
install
+
+
+(no need in manual calling)
+
+
+
uninstall
+
+
-
+
+
+
enable-domain
-
+
-
-
-
-
disable-domain
-
+
-
-
-
-
enable-global
-
+
+/- (custombuild)
-
-
-
disable-global
-
+
-
-
-
-
build-native-lsphp
-
+
+/- (custombuild)
-
-
-

Different PHP versions (without PHP Selector)

mod_lsapi allows to use different handlers for different php versions. For example, a file with extension .php53 can be handled by php5.3 and a file with extension .php55 handled by php5.5 without PHP Selector.
Here is an extra config file which allows to set handlers and php binaries for these handlers - /etc/container/php.handler. Example of this file:

# cat /etc/container/php.handler
application/x-lsphp53 /opt/alt/php53/usr/bin/lsphp
application/x-lsphp55 /opt/alt/php55/usr/bin/lsphp

Default handler for lsphp is - application/x-httpd-lsphp, if I set in .htaccess such options:

AddType application/x-httpd-lsphp .php5 .php4 .php .php3 .php2 .phtml
AddType application/x-lsphp53 .php53

File index.php53 will be processed by php 5.3, but index.php processed by php standard, placed at /usr/local/bin/lsphp.

mod_lsapi as suPHP replacement (cPanel)

mod_lsapi is a drop in replacement for suPHP. No configuration changes need to be done. To switch from suPHP to mod_lsapi:

Switch the whole server (disables suPHP, all domains will be serviced by mod_lsapi):

/usr/bin/switch_mod_lsapi --enable-global

Switch individual domains:

/usr/bin/switch_mod_lsapi --enable-domain test.example.tst - enablesmod_lsapi [only for domain test.example.tst]

Manually add mod_lsapi for a particular domain: - add to .htaccess file for the domain:
AddType application/x-httpd-lsphp .php5 .php4 .php .php3 .php2 .phtml

Note: This will work only after /usr/bin/switch_mod_lsapi --setup had been called.


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