Which Linux distribution we choose Centos or Fedora

There are many different versions of Linux, and unlike other commercial operating systems that are controlled, distributed and supported by only one company, the core of Linux is free to distribute and use. This creates a situation in which numerous companies, organizations and individuals have developed their own specific version of the Linux operating system. When these versions are made publically available for use, they are known as “distributions”.

Centos 6.3 Screen resolution - GUI not fit for default resolution and we not able to change it. No other option available in screen display settings

Centos screen resolution - GUI not fit for default resolution and no other option was in screen display settings.

Remove xorg.conf file having resolution setting. Follow below steps:

1. Go to /etc/x11/ 
2. Remove xorg.conf file
3. Reboot System

When system starts and comes to gui. Now go to screen display settings. All other options for screen resolution will be visible now. We can set it now.

 

Set selinux to allow Apache and Samba on the same folder

First off, you can view the context of something with ls using ls -Z

[root@servername www]# ls -dZ /var/www/html

drwxr-xr-x  root root system_u:object_r:httpd_sys_content_t /var/www/html

Second, there are two options for giving Samba and Apache access to the same directory.
The simple way is to just allow samba read/write access everywhere with:

PHP files not working after LAMP (linux, PHP, Mysql, Installation) Add entries in IPtable for port 80 and 443

After successfully installing PHP, Mysql, Apache if still you are not able to execute php files. You need to check firewall settings on server. Check entries in iptable and allow access to port 80 and 443

open /etc/sysconfig/iptables

Add below lines :
# Allow traffic on port 80 (HTTP traffic)
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
#Allow traffic on 443 (HTTPS traffic)
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT

 Save and restart apache.

Try to run now your php files in browser it will work.

How to configue screen resolution after centos/linux installation if no option to change resolution

Sometimes after Centos installation screen resolution creates issue as you will not be able to view full window and configuration options tabs will be hidden.

The simplest way to sortout this issue is delete xorg.conf file.

Follow belwo steps :

1. Navigate /etc/XII/ directory
2. Remove or rename xorg.conf configuration file
3. Restart the system (Type init 6 in terminal)

After restart system will automatically open configuration screen for set screen resolution.. You can select according to your choice.