HTTP ERROR 500

Problem accessing /service/home/admin@domainname/Notebook. Reason:

    system failure: wiki formatter failure

Sounds like you don’t have Documents enabled,You can use following steps to enable it.

All you need to do is re-initalize the notebook template for the renamed wiki user (wiki@domain.com)

1. login to the zimbra server.
2. Shell into the zimbra account (su – zimbra)
3. run zmprov in wiki@domain.com
4. look for the following output: Initializing folders

Regards

Alex P.

Hello,

If you having trouble compiling any application manually using “configure” , here simple fix for this error.

Error ::

checking whether we are using the GNU C++ compiler... no
checking whether g++ accepts -g... no
checking how to run the C++ preprocessor... /lib/cpp
configure: error: C++ preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.

Solution::

• Centos/Fedora/RHEL

  yum install gcc gcc-cpp gcc-c++

• Ubuntu/Debain

  apt-get install gcc gcc-cpp gcc-c++

Regards

AlexP

mysql_pconnect() will maintain a persistent connection to the database. Whenever your script calls the connect to database function, it first searches already existing connections to the database and if exists it will use the same connection to connect to the database, if not it will open a new connection to the database. ie. Connection is Persistent

where as mysql_connect() function will establish a new connection whenever a connection to database needed, and after executing the script, this function disconnects the connection. ie. connection is not a persistent one.

mysql_pconnect() function is used where your site has a Heavy Traffic and where as mysql_connect() function is used when there is moderate/less traffic to your site.

Regard’s

Alex P

System Administrator.

memcached is a high-performance memory object caching system intended to speed up dynamic web applications by alleviating database load.

memcached is meant to work in concert with something like the MySQL query cache, not replace it. The two implementations excel at vastly different things: memcached is an object cache, while MySQL provides a query cache.

memcached is extremely fast. It uses libevent, which provides a mechanism to execute a callback function when a specific event occurs on a file descriptor, to scale to any number of open connections. On a modern Linux system memcached utilizes epoll, is completely non-blocking for network I/O, ensures memory never gets fragmented, and uses its own slab allocator and hash table to achieve 0(1) virtual memory allocation.

How it install it on Linux server ?

• Install dependency software (Libevent)

#curl -O http://monkey.org/~provos/libevent-1.4.9-stable.tar.gz
#tar -xzvf libevent-1.4.9-stable.tar.gz
#cd libevent*
#./configure
#make
#make install

• Now let’s download the newest Memcached source

#curl -O http://www.danga.com/memcached/dist/memcached-1.3.0.tar.gz
#tar zxf memcached-1.3.0.tar.gz
#cd memcached-1.3.0
#./configure
#make
#make install

• Then add /usr/local/lib to LD_LIBRARY_PATH in your .bash_profile

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
export LD_LIBRARY_PATH

How it Works

First, you start up the memcached daemon on as many spare machines as you have. The daemon has no configuration file, just a few command line options, only 3 or 4 of which you’ll likely use:

Run Memcached as a daemon (d = daemon, m = memory, u = user, l = IP to listen to, p = port)

#memcached -d -m 1024 -u root -l 127.0.0.1 -p 11211 –u nobody

This starts memcached as a daemon (-d) on the IP address and port specified with -l and -p, respectively, running as the user nobody (-u), allocating 1024  for object storage (-m). You should adjust the amount of storage to suit your needs; many memcached installs run with 4 GB. Once you are comfortable with your startup options, add the appropriate command to your startup scripts.

Create a /etc/init.d/memcached file and add above line to start memcached when the server boots

With memcached installed and running, it’s time to get PHP talking to the object cache. While multiple PHP API exists, the one in the PECL repository is recommended. If you are running a newer version of PHP, installation is as simple as:

# pecl install memcache

Or you can use following steps to install PECL memcache manually.

#cd /usr/local/src
#curl -O http://pecl.php.net/get/memcache
#tar zxvf memcache*
#cd memcache-*
#phpize
#./configure
#make && make install

Now we have to make sure PHP loads the newly built memcache.so library by adding the following line to php.ini:

extension=memcache.so

Now restart Apache:

Service httpd restart

Once it sucussfully install you can create phpinfo() on your webserver should now confirm that memcache is installed.

Regards
AlexP

Svn(subversion) is used to maintain current and historical versions of files such as source code, web pages, and documentation. Its goal is to be a mostly-compatible successor to the widely used Concurrent Versions System (CVS).

It is very easy to install subversion client on linux OS using yum. You can us following command to install subversion client.

root@server [~]# yum install subversion

while installing subversion if you are getting following error  then it seem sot be perl-URI package is not installed on your server so you will have to install first before installing subversion client.

Please follow the following steps to install perl-URI package

You’ll login via SSH as root and run this command:

root@server [~]# yum install subversion

and then you may get this error:

Error: Missing Dependency: perl(URI) >= 1.17 is needed by package subversion

Here’s what you do next (copy/paste):

root@server [~]# wget  ftp://ftp.pbone.net/mirror/archive.fedoraproject.org/
fedora/linux/releases/7/Everything/i386/os/Fedora/
perl-URI-1.35-3.noarch.rpm 

root@server [~]# rpm -i perl-URI-1.35-3.noarch.rpm

root@server [~]# yum install subversion

Installed: subversion.x86_64 0:1.4.2-4.el5 subversion.i386 0:1.4.2-4.el5

Dependency Installed: neon.x86_64 0:0.25.5-10.el5 neon.i386 0:0.25.5-10.el5

Complete!

That’s it subversion client is successfully installed on your server you can check it using following command.

root@server [~]#svn --version
svn, version 1.1.4 (r13838)
compiled Aug 21 2005, 20:56:55

Copyright (C) 2000-2004 CollabNet.
Subversion is open source software, see http://subversion.tigris.org/
This product includes software developed by CollabNet (http://www.Collab.Net/).

The following repository access (RA) modules are available:

* ra_dav : Module for accessing a repository via WebDAV (DeltaV) protocol.
- handles 'http' schema
- handles 'https' schema
* ra_local : Module for accessing a repository on local disk.
- handles 'file' schema
* ra_svn : Module for accessing a repository using the svn network protocol.
- handles 'svn' schema

Regards

Alex P

How can you do that ?

After installing suhosin, remove all functions from disable_functions in php.ini and add in php.ini suhosin.executor.func.blacklist = “exec,passthru,shell_exec” and all the functions that you want to disable globally.

After that for each domain in the virtual host section you can add suhosin.executor.func.blacklist again but without the function that you need to enable. And so you will enable that function only for one domain.

Example:

<VirtualHost 127.0.0.1>
………..
………..
<IfModule mod_php4.c>
php_admin_value open_basedir “/usr/lib/php”
</IfModule>
<IfModule mod_php5.c>
php_admin_value open_basedir “/usr/lib/php”
php_admin_value suhosin.executor.func.blacklist = “passthru,shell_exec”
</IfModule>
…….
……
</VirtualHost>

In this example exec has been enabled for the VirtualHost. This way it will be better as you do not neet to modify all the virtual hosts only the ones that you need to enable one or more functions.

Regard’s

Alex P

What is mod_ruby?

mod_ruby embeds the Ruby interpreter into the Apache web server, allowing Ruby CGI scripts to be executed natively. These scripts will start up much faster than without mod_ruby.

1) Install eRuby

# wget http://www.modruby.net/archive/eruby-1.0.5.tar.gz
# tar -xzvf eruby-1.0.5.tar.gz
# cd eruby-1.0.5/
# ./configure.rb –with-charset=euc-jp –enable-shared
# make; make install

2) Install mod_ruby

i)Download latest mod_ruby tar file
# wget http://www.modruby.net/archive/mod_ruby-1.2.6.tar.gz
# tar -xzvf mod_ruby-1.2.6.tar.gz
# cd mod_ruby-1.2.6/
#  ./configure.rb –enable-eruby –with-apxs=/usr/local/apache/bin/apxs
# make; make install

ii)Edit apache configuration file ( httd.conf) and add following code

LoadModule ruby_module libexec/mod_ruby.so
ClearModuleList
AddModule mod_ruby.c
AddHandler cgi-script .rb
<IfModule mod_mime.c>

# for Ruby/eRuby
<IfModule mod_ruby.c>
# for Apache::RubyRun
RubyRequire apache/ruby-run
# for Apache::ERubyRun
RubyRequire apache/eruby-run
# for development
# RubyRequire auto-reload
# for add library
#RubyAddPath /usr/local/lib/ruby
# exec *.rbx as ruby scripts.
<Files *.rbx>
SetHandler ruby-object
RubyHandler Apache::RubyRun.instance
</Files>
# handle *.rhtml as eruby files.
<Files *.rhtml>
SetHandler ruby-object
RubyHandler Apache::ERubyRun.instance
</Files>
</IfModule>
</IfModule>

iii) Restart apache service on server

Regards

Alex P

Hello,

I was facing same error with one of my shared server last couple of week, apache was broke on server and getting following error in apache error logs file.

[emerg] (28)No space left on device: Couldn't create accept lock

[notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)

[notice] Digest: generating secret for digest authentication ...

[notice] Digest: done

[warn] pid file /etc/httpd/run/httpd.pid overwritten -- Unclean shutdown of previous Apache run?

[emerg] (28)No space left on device: Couldn't create accept lock

I checked disk space, or quota limit but everything was fine. I through it seem to apache semaphore problem

Apache can create the “accept lock” is with a semaphore. A semaphore is an inter-process communication tool that is used by Apache to communicate with it’s child processes. This error message may mean that Apache couldn’t create a new semaphore.

Check to see how many semaphores are currently in use. If Apache is running correctly, you should see something like this:

# ipcs -s

If Apache is stopped, and you still see these semaphores, then you can safely kill them by running this command for each semaphore id (in the second column)

$ ipcrm -s <semid>

To destroy all semaphores, you can run this from the command line (with “apache” being the apache-user:

for semid in `ipcs -s | grep apachec | cut -f2 -d" "`; do ipcrm -s $semid; done

OR

ipcs -s | grep apache | perl -e ‘while (<STDIN>) { @a=split(/\s+/); print `ipcrm sem $a[1]`}’

OR

ipcs -s | grep nobody | perl -e ‘while () { @a=split(/\s+/); print `ipcrm sem $a[1]`}’
ipcs -m | grep nobody | perl -e ‘while () { @a=split(/\s+/); print `ipcrm -m $a[1]`}’

OR
for i in `ipcs -s | awk ‘/httpd/ {print $2}’`; do (ipcrm -s $i); done

How to increase semaphore limit

To view the current parameters:

ipcs -l

To change these parameters, modify the file /etc/sysctl.conf and add the following lines:

kernel.msgmni = 1024

kernel.sem = 250 256000 32 1024

Then load these settings with the command:

sysctl -p

Regards

StacyM

System Administrator

PHP Fatal error: [ionCube Loader] The Loader must appear as the first entry in the php.ini file in Unknown on line 0
Here solution of this problem
1) Please go to cd /etc/php.d/ directory, edit ioncube.ini file and comment following line

#zend_extension=/usr/lib/php4/ ioncube_loader_lin_4.3.so

2) Now open php.ini file and add following code

zend_extension_manager.optimizer=/usr/local/Zend/lib/Optimizer-3.0.1
zend_extension_manager.optimizer_ts=/usr/local/Zend/lib/Optimizer_TS-3.0.1
zend_optimizer.version=3.0.1
zend_extension=/usr/local/ioncube/ioncube_loader_lin_4.3.so
zend_extension=/usr/local/Zend/lib/ZendExtensionManager.so
zend_extension_ts=/usr/local/Zend/lib/ZendExtensionManager_TS.so

(Note : Depend of php veriosn please change ioncube_loader_lin_4.X.so file )
Problem fixed
Enjoy ……………………:)

Regards
Alex P
System Administrator.

What is Clientexec?

Clientexec is a robust client management software use for managing hosting clients, as well as many other types of clients, that offers the ability for monthly billing. CE Clientexec) also offers an area for your clients to create support tickets, and allows you to respond to the tickets as well. CE integrates with Paypal, Authorize.net, and many other 3rd party online payment processors. Here is the procedure on how to install ClientExec

You will have to buy the license for that from here You will get the licencekey from them. Depending upon your server configuration you will have to download exect clientExec from here.

Detail of CE
For example if you have following configuration

- PHP versions between 4.3.0 and 5.0.5
- MySQL versions till 4.1

then you can download the CE ( clientExec Files from here)

wget http://download.powervps.com/clientexec/Clientexec.2.7.3.Ion.zip
wget http://downloads.ioncube.com/loader_downloads/ioncube_loaders_lin_x86-64.tar.gz

Now To install ClientExec:

- The first step is to create a database. (You need to create a mySQL database, database username, and database password.)

- Upload the entire contents of the zip file to your server in BINARY mode.

- Apply any patches as needed.

- Change CHMOD permissions on the config.php file to 666.

- Also modify the config file as per your database configuration.

- Point your browser to http://domain.com/install.php

- After the installation is complete, delete or move the install.php file

That is it. You should have a clean install and ready to go.

READ the CHANGELOG.txt file

1) First step in any upgrade is to backup your database. You can do so using an application like phpmyadmin which is commonly found with your hosting control panel utilities.

NOTE: We can not stress this step enough. We can not help you easily with any issues to your data unless you have a backup before any upgrade.

2) Unzip the contents of your compressed ClientExec file.

3) FTP to your server, which contains the domain of your ClientExec installation.

4) Remove all of your files except for:
config.php
license.php – If upgrading from 2.2.x you do not need to keep your license file
uploads/files – Do not remove this folder if you have files in your files manager

5) Upload all the content files from the ClientExec zip file. Ensure that you do not overwrite
config.php or license.php

6) Visit http://yourceurl/install.php and click on Upgrade. Follow the steps until completion.

7) If you are getting any error o the above URL then please check that you have change the file permission to 666 and Delete install.php.

Upgrading Notes:

-If you see the install option available when you run the install.php script then you need to check your config.php and ensure that you didn’t overwrite by mistake.
-If you are upgrading from beta 2.2.x then you do not need to keep your license.php file prior to running the upgrade.
-After you have upgraded your version of CE you can now delete your license.php file.
-After you have upgraded your version of CE make sure you remove your install.php file.
-If after upgrading you find that you have unauthorized version installed message do not stress, just follow the instructions below on obtaining a new license.
-After each upgrade go to admin->settings->3rd party invoices to ensure all plugins are synched properly

You can have detail info for clientexec at following URLS:

http://www.clientexec.com/manual

http://www.clientexec.com/kb

http://www.ce-talk.com/

Regards

Alex P