IPTables Firewall Configuration in RHEL5
Firewall are two types hardware firewall and software firewall. The important work of firewall is to monitor and control the incoming and outgoing packets.
IPtables is an important firewall in linux. TCP wrapper and SELinux is also a firewall.
Package: iptables
Service: iptables
Operations
There are 3 operations iptables can do
Accept
Allow the packet
Drop
Drop the packet and don't send error message to sender.
Reject
Drop the packet and send error message to sender.
Options
i - incoming interface
O - outgoing interface
A - append (e
Web Server Configuration in Redhat
Web server is a computer, which deliver web pages. Every web server will have atleast one static IP address and one domain name. When we request a website, for example (www.abc.com), this domain stored in a web server and web server have a static IP. Static IP of web server is stored in DNS, so our browser goes to web server by help of DNS record to fetch the webpage.
Here we are going to see how to configuration of web server in RHEL5
Before going to configure web server, make sure that following are done correctly
Hostname
Domainname
IP address
DNS configuration
Package:
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What is the difference between include() and require() in php
include() and require() function does the same process of calling a php or html or js file.
When the included file (i.e., calling a file) is missing in its actual directory, then require() function will returns FATAL ERROR and include() function will return WARNING.
Read: what is the use of include() and require() in php
include_once() function will include a file only when that file is not included before. This function is the recommended for including files, because including a file more than once will arise ERROR
require_once() function performs the same operation performed by
what is difference between mysql_fetch_array(), mysql_fetch_row(), mysql_fetch_assoc() and mysql_fetch_object() in php
what is the use of include() and require() in php
include() and require() are used to call the php files, this functions are used when a file is needed by more than one or two php files
For including file, code reuse
For example:
index.php
[code type=html]
<html>
<head>
<title>Tobbynews</title>
</head>
<body>
<?php
echo “welcome”;
?>
</body>
</html>
[/code]
This html codes are used in almost all php files, so we have to include this code in separate file and call that files where we wanted
[code type=html]
<html>
<head>
&l
LVM Configuration in RHEL5
partition, which has been created is fixed in size. LVM (Logical Volume Manager) configuration is used to extend the partition.
Create partition
#fdisk -l
#fdisk /dev/sda
:n // n means new partition creation
:l // l means logical partition
+500M
:t ( toggle 't' convert one partition to another)
LVM conversion code: 8e // for linux LVM
:w // save
#partprobe | sync
creating physical volume, PV- Physical Volume
Here sda8 is the partition, which is create by above step
#pvcreate /dev/sda8
Creating volume group, VG - Volume Group
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Multiple DNS Configuration in Redhat
