Archive | Scripting

Using PHP composer.phar With Non-default PHP Install

By admin on August 18, 2015 in PHP

Composer for PHP is an increasingly popular tool for managing packages within a PHP application. Here’s a link for more information:

https://getcomposer.org/

On many of our Plesk servers we have multiple PHP versions install. The default at /usr/bin/php is provided by the Linux distribution and then there are additional version installed at /opt/plesk/php. Plesk lets us easily select the PHP version for each hosted website. But you can run into problems with composer using the wrong PHP version. A typical composer command might be:

php composer.phar install

1	php composer.phar install

php composer.phar update

1	php composer.phar update

To make our alternate PHP version work we need to instead do something like this:

export PATH=/opt/plesk/php/5.6/bin:$PATH; php composer.phar update

1	export PATH=/opt/plesk/php/5.6/bin:$PATH; php composer.phar update

So we override the default PHP by adding our preferred version to the front of the path.

Apache2 With mod_fcgid On CentOS 6.2

By admin on March 23, 2015 in Apache, PHP

Need mod_fcgid on a CentOS 6.2 or similar server? Check out this great how-to:

https://www.howtoforge.com/how-to-set-up-apache2-with-mod_fcgid-and-php5-on-centos-6.2

I especially like the use of suexec.

This howto worked on the first try! There are not many actual working mod_fcgid howtos!

One issue that I did run into is the default MaxRequestLen is 131768 which is way to low so had to add this line:

FcgidMaxRequestLen 20971520

1	FcgidMaxRequestLen 20971520

to /etc/httpd/conf.d/fcgid.conf.

Disable PHP zlib.output_compression

By admin on January 25, 2015 in Apache, PHP

If you need to disable zlib output compression from the .htaccess file, then just add the following line to the top of the file:

php_flag zlib.output_compression off

1	php_flag zlib.output_compression off

Python 2.7 and Python 3.3 on CentOS 6

By admin on May 19, 2014 in Python

Here’s a brilliant article on how to add python 2.7 and 3.3 to a CentOS server which defaults to 2.6 without breaking anything:

http://toomuchdata.com/2014/02/16/how-to-install-python-on-centos/

Especially useful is the last section on creating and using an isolated environment.

maxclients.sh Script For Apache

By admin on May 3, 2014 in Apache, Bash Scripting

This script attempts to look at Apache memory usage and recommend a stable setting for MaxClients.

#!/bin/bash

PROCNAME=httpd
PARENTPIDS=`comm -12 <(ps -C $PROCNAME -o ppid | sort -u) <(ps -C $PROCNAME -o pid | sort -u)`

for ParPID in $PARENTPIDS; do
  SUM=0
  COUNT=0
  for x in `ps f --ppid $ParPID -o rss | tail -n +2`; do
    SUM=$(( $SUM + $x ))
    COUNT=$(( $COUNT + 1 ))
  done

  MEMPP=$(( $SUM / $COUNT / 1024 ))
  FREERAM=$(( `free | tail -2 | head -1 | awk '{print $4}'` / 1024 ))
  APACHERAM=$(( $SUM / 1024 ))
  APACHEMAX=$(( $APACHERAM + $FREERAM ))

  (
  echo
  echo "Info for the following parent apache process:"
  echo "  "`ps f --pid $ParPID -o command | tail -n +2`
  echo
  echo "Current # of apache processes:        $COUNT"
  echo "Average memory per apache process:    $MEMPP MB"
  echo "Free RAM (including cache & buffers): $FREERAM MB"
  echo "RAM currently in use by apache:       $APACHERAM MB"
  echo "Max RAM available to apache:          $APACHEMAX MB"
  echo
  echo "Theoretical maximum MaxClients:  $(( $APACHEMAX / $MEMPP ))"
  echo "Recommended MaxClients:          $(( $APACHEMAX / 10 * 9 / $MEMPP ))"
  echo
  )
done

#!/bin/bash

PROCNAME=httpd

PARENTPIDS=`comm -12 <(ps -C $PROCNAME -o ppid | sort -u) <(ps -C $PROCNAME -o pid | sort -u)`

for ParPID in $PARENTPIDS; do

SUM=0

COUNT=0

for x in `ps f --ppid $ParPID -o rss | tail -n +2`; do

SUM=$(( $SUM + $x ))

COUNT=$(( $COUNT + 1 ))

done

MEMPP=$(( $SUM / $COUNT / 1024 ))

FREERAM=$(( `free | tail -2 | head -1 | awk '{print $4}'` / 1024 ))

APACHERAM=$(( $SUM / 1024 ))

APACHEMAX=$(( $APACHERAM + $FREERAM ))

(

echo

echo "Info for the following parent apache process:"

echo " "`ps f --pid $ParPID -o command | tail -n +2`

echo

echo "Current # of apache processes: $COUNT"

echo "Average memory per apache process: $MEMPP MB"

echo "Free RAM (including cache & buffers): $FREERAM MB"

echo "RAM currently in use by apache: $APACHERAM MB"

echo "Max RAM available to apache: $APACHEMAX MB"

echo

echo "Theoretical maximum MaxClients: $(( $APACHEMAX / $MEMPP ))"

echo "Recommended MaxClients: $(( $APACHEMAX / 10 * 9 / $MEMPP ))"

echo

)

done

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Archive | Scripting

Using PHP composer.phar With Non-default PHP Install

Apache2 With mod_fcgid On CentOS 6.2

Disable PHP zlib.output_compression

Python 2.7 and Python 3.3 on CentOS 6

maxclients.sh Script For Apache