VMWare Player is a free software available from VMWare Inc. enabling the creation of guest OS within an existing OS Notes for a beginner ... * VMWare Player and VMWare Server are available for free * A .vmdk file is the virtual hard drive for the guest OS * A .nvram file stores the BIOS settings of the virtual machine * A .vmx file stores the configuration settings for the virtual machine. All you need is a text editor to edit the VMWare configuration settings. * A .vmsd file stores information about VMWare snapshots. (more…)

Difference between which command and whereis command in Linux For e.g. lets find where "samba" is located in a CentOS server $ which samba which command searches the list of programs listed down through the PATH settings $ whereis samba whereis command also searches for programs that are not present in the PATH setting

Samba facilitates file sharing across linux, windows systems for beginners First create a folder in your Windows system, right click the folder and share the folder for network access. Let say that you have created a folder for share as "xpshare" and that the name of your windows machine is "windowsxp" (right click "My Computer" and select properties. Under the tab "Computer Name" you can note the name of the machine) (more…)

Apache errors and the approach to solve it Premature end of script headers 500 Internal Server Error The specified CGI application misbehaved by not returning a complete set of HTTP headers. Some troubleshooting tips: i) Check /var/log/apache2/error.log (in ubuntu, check the respective apache error log location for the messages) ii) Check if the content type of the page is correctly set for the html content output. print "Content-type: text/html\n\n"; iii) Check if a valid permission has been given for the file to get executed. The file need permission 755 for it to be executed on the server. iv) Check if the configuration path, inclusion path are set correctly in the referenced programs

Apache Permission Denied Error can be caused due to one of many configuration mistakes listed below Check the apache configuration settings i) The first is the reference to folder where cgi or perl files will reside and its execute permission settings

 <ScriptAlias /cgi-bin/ /usr/local/cgi-bin/>
 <Directory "/usr/local/cgi-bin">
     AllowOverride None
     Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
     Order allow,deny
     Allow from all
 </Directory>

ii) The second is the proper add handlers that are set for the file execution

AddHandler cgi-script .cgi .pl
<Files ~ "\.pl$">
    Options +ExecCGI
</Files>
<Files ~ "\.cgi$">
   Options +ExecCGI
</Files>

Check the apache error log for any messages (/var/log/apache2/error.log).

Step 1: $ sudo apt-get install postfix Postfix configuration screen throws you with the following options to choose from i) No changes (no changes to configuration settings) ii) Internet site (Mail sent and received using SMTP) iii) Internet with smarthost (Mail sent to another machine called smarthost) iV) Satellite system (All mail sent to another machine for delivery) v) Local only (No network based mail system. Only applied to this local machine) (more…)