MAMP 3 is by far the best option for running a local web server with easy access to PHP, MySQL, and a range of dynamic DNS options.
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The moment I upgraded to PHP 5.4, my Wordpress sites and servers were flooded with error messages. Thankfully, the crew at Atomicorp are maintaining a legacy PHP 5.3 repository that you can use to easily downgrade your PHP installation. This guide will show you how to use the Nucleus repository to safely and easily downgrade your PHP version back to 5.3.
APC is an opcode cache that can significantly speed up your PHP applications. When dealing with Plesk web servers with multiple users and websites, APC PHP cache might be required in order to achieve reliable server performance.
Tuning Plesk servers for optimal Apache PHP / FCGI performance can be a nightmare. Here is a great guide on getting you started. Special thanks to the LinuxDriver blog for some of these great tips.
This should go without saying: make sure to backup your configuration files before trying any new settings!
Step 1: Modify fcgid.cpnf
nano /etc/httpd/conf.d/fcgid.conf
LoadModule fcgid_module modules/mod_fcgid.so
AddHandler fcgid-script fcg fcgi fpl
FcgidIPCDir /var/run/mod_fcgid/sock
FcgidProcessTableFile /var/run/mod_fcgid/fcgid_shm
FcgidInitialEnv RAILS_ENV production
FcgidIdleTimeout 3600
FcgidIdleScanInterval 480
FcgidBusyTimeout 1800
FcgidBusyScanInterval 480
FcgidZombieScanInterval 12
FcgidErrorScanInterval 12
FcgidProcessLifeTime 0
# Change the rate at which new FastCGI processes are spawned under load. Higher=faster
FcgidSpawnScoreUpLimit 10
# Higher number = spawning more FastCGI processes decreases the spawn rate (controls runaway
FcgidSpawnScore 1
# Higher number = terminating FastCGI processes decreases the spawn rate (controls runaway)
FcgidTerminationScore 2
# Increase the FastCGI max request length for large file uploads (needed for some sites)
FcgidMaxRequestLen 1073741824
FcgidMaxRequestsPerProcess 100000
#FcgidMinProcessesPerClass 3
FcgidMaxProcessesPerClass 4
FcgidMaxProcesses 16
FcgidIOTimeout 1800
Modifying your PHP.conf
Next, let's edit our php.conf
nano /etc/httpd/conf.d/php.conf
AddHandler php-script .php
AddType text/html .php
DirectoryIndex index.php
Step 3: SWTune – Optional
Now we are going to create a special SWTune.conf configuration file. I've had mixed success with this, so please experiment with this. I believe this will be more effective on lower resource systems. You may choose to skip this step.
nano /etc/httpd/conf.d/swtune.conf
HostnameLookups off
KeepAlive Off
StartServers 1
ServerLimit 2
MinSpareThreads 32
MaxSpareThreads 96
ThreadLimit 64
ThreadsPerChild 32
ThreadStackSize 2097152
MaxClients 64
MaxRequestsPerChild 0
Step 4: CPU and Memory configuration
Finally, this next shell command will determine the best configuration settings based on your processors and amount of memory.
num_cpus=$(awk '/^processor/{count++}END{print count}' /proc/cpuinfo)
sed -i 's%[#]*HTTPD=.*%HTTPD=/usr/sbin/httpd.worker%g' /etc/sysconfig/httpd
sed -i 's%HTTPD_BINs.*%HTTPD_BIN /usr/sbin/httpd.worker%g' /etc/psa/psa.conf
sed -i "s/(ServerLimits*).*/1$(( $num_cpus * 2 ))/" /etc/httpd/conf.d/swtune.conf
sed -i "s/(MaxClientss*).*/1$(( ( $num_cpus * 2 ) * 32 ))/" /etc/httpd/conf.d/swtune.conf
service psa stopall
service psa restart
Notes:- The earlier mentioned sequences or patterns will adapt the host limitations and Optimum Customers in respect to the CPU quantity.
I spent some time trying to figure out how to fix the Suexec Policy Violation error under Plesk in Centos.
