Wednesday, June 25, 2014

Image Gallery - Network Room Fun

By: Unknown On 1:04 PM

Tuesday, June 24, 2014

How to Configure Name Based Web Server in Linux

Red Hat® Certified Engineer (RHCE®) is a Red Hat Certified System Administrator (RHCSA) who possesses additional skills, knowledge, and abilities required of a senior system administrator responsible for Red Hat Enterprise Linux® systems.

An RHCE is capable of:

    Configuring static routes, packet filtering, and network address translation.
    Setting kernel runtime parameters.
    Configuring an Internet Small Computer System Interface (iSCSI) initiator.
    Producing and delivering reports on system utilization.
    Using shell scripting to automate system maintenance tasks.
    Configuring system logging, including remote logging.
    Configuring a system to provide networking services, including HTTP/HTTPS, File Transfer        Protocol(FTP), network file system (NFS), server message block (SMB), Simple Mail Transfer Protocol (SMTP), secure shell (SSH) and Network Time Protocol (NTP).

How to create multiple virtual host using name based virtual host.

First install web server in system

root@linuxstorage:~#yum install https* -y

configure the httpd configuration file

root@linuxstorage:~# vi /etc/httpd/conf/httpd.conf

to enable Name Based virtual host change line by removing symbol in front of line

#NameVirtualHost *:80
     to

NameVirtualHost xx.xx.xx.xx(Domain ip ):80

copy last 7 line of sample and paste it below, then edit it as given below

#<VirtualHost *:80>
#    ServerAdmin webmaster@dummy-host.example.com
#    DocumentRoot /www/docs/dummy-host.example.com
#    ServerName dummy-host.example.com
#    ErrorLog logs/dummy-host.example.com-error_log
#    CustomLog logs/dummy-host.example.com-access_log common
#</VirtualHost>

change like this

<VirtualHost xx.xx.xx.xx:80>
    ServerAdmin webmaster@linuxstorages.com
    DocumentRoot /var/www/html/sample1
    ServerName sample1.com
    ErrorLog logs/sample1.com-error_log
    CustomLog logs/sample1.com-access_log common
</VirtualHost>
<VirtualHost xx.xx.xx.xx:80>
    ServerAdmin webmaster@linuxstorages.com
    DocumentRoot /var/www/html/sample2
    ServerName sample2.com
    ErrorLog logs/sample2.com-error_log
    CustomLog logs/sample2.com-access_log common
</VirtualHost>

:wq!

Both sample1.com and sample2.com domains will have same ip address. Like this we can create more sites using single ip address with help of name based virtual host.

Both virtual host have different document root.

Now we can move file to particular document root.

    root@linuxstorage:~#cd /var/www/html/sample1

    root@linuxstorage:~#vi index.html

    test1

    :wq!

    root@linuxstorage:~#cd /var/www/html/sample2

    root@linuxstorage:~#vi index.html

    test2

    :wq!

root@linuxstorage:~#httpd -s

check the configuration status with help of above command and now restart the web server service

root@linuxstorage:~#service httpd restart

check the domain names in URL or elinks command.

    root@linuxstorage:~#elinks http://sample1.com
    test1

    or

    root@linuxstorage:~#elinks http://sample2.com
    test2

By: Unknown On 5:23 PM

Image Gallery - RHEL 7

By: Unknown On 2:45 PM

Image Gallery - Linux

By: Unknown On 2:38 PM

Monday, June 23, 2014

Opera For Linux is Finally as Beta

Opera for Linux is finally here, but only as a beta

Opera has finally released a version of its popular browser for Linux. The Developer version of Opera 24 brings familiar Windows and Mac features to the open source platform and users can get it from the experimental Developer channel. Opera 24 will be an alternative to Chrome and Firefox, which are the two most used browsers on Linux.

Opera claims to have repurposed the browser based on the Blink rendering engine, that the company adopted when Google, along with Opera, ditched WebKit. “We’ve had many questions about Opera on Linux from our users,” says Zhenis Beisekov, Product Manager of Desktop Products at Opera Software. “We focused on rebuilding the entire browser, adding a new engine and the same features you can find in the Windows and Mac versions. Now, you can finally get a web experience completely re-thought for the Linux platform.”
With this Developer version, Linux users will get their first taste of Opera features such as the quintessential Speed Dial, Stash and Discover features. The Speed Dial is essentially your home page on the browser and gives you an overview of your bookmarks, folders, and recent history. Stash lets users collect webpages and arrange them in categories. Think of it like Pinterest within the browser, designed to help you plan your work, travel or home life with collections of links. Discover is essentially an RSS reader, which gathers articles based on your interests and specified topics.
For now, Opera for Linux is only available in a Developer or beta version, while a stable version has been planned for the future.

By: Unknown On 6:26 PM

Saturday, June 21, 2014

How to Configure a WebServer in Linux

Implement a webserver

CMD:

Install web server packages using yum command

root@linuxstorages:~#yum install httpd* -y

Configure the web server configuration in below path

root@linuxstorages:~#vim /etc/httpd/conf/httpd.conf

Copy the last 7 line and paste in last. Then change all dummy into your hostname

Change document root is /var/www/html

:wq!

Change directory to document root of web server

root@linuxstorages:~#cd /var/www/html

Connect FTP server using lftp command

root@linuxstorages:~#lftp server id

>cd /var/www/ftp

>get data.html

>bye

get - download file from server to local

bye - exit ftp server connection

Rename data.html to index.html

root@linuxstorages:~#mv data.html index.html

Enter ip address details in host file

root@linuxstorages:~#vim /etc/hosts

Add   ipaddress    hostname(fully)    hostname(half)

xx.xx.xx.xx    user.linuxstorages.com user.linuxstorages

:wq!

Check status of web server configuration file after configuring

         root@linuxstorages:~#httpd -t
         syntax ok

        root@linuxstorages:~#service httpd restart

        root@linuxstorages:~#chkconfig httpd on

Check the URL using elinks command in terminal

root@linuxstorages:~#elinks user.linuxstorages.com

By: Unknown On 10:00 AM

Friday, June 20, 2014

RHEL 7 Features

Red Hat has launched Red Hat Enterprise Linux 7 beta which will introduce a variety of new virtualization, cloud, networking, file system, and live update features.

Celebrating the launch of Red Hat Enterprise Linux 7! Check out the features: http://red.ht/overviewrhel7 #RHEL7 #RedHat

File systems have continued to be a major focus of development in within RHEL. XFS is currently the default file system in RHEL 7, allowing support file systems as large as 500TB. But scalability enhancements to ext4 file systems allow them to be 16TB to 50TB standalone with block sizes of up to 1MB.

This simplifies and speeds up block allocation and defragmentation. Emerging file system Btrfs is available as a technology preview within Red Hat Enterprise Linux 7.

Networking is now faster (with 40Gb Ethernet link support), more responsive, and includes TCP Fast Open and Early Retransmit for TCP.

By: Unknown On 8:39 AM

Thursday, June 19, 2014

Linux Basic Commands Video Part1

This video explains some of the most used Linux commands and their basic usage which will be more helpful for beginners. All these commands should be entered at the command prompt and you must press the ENTER button to execute the desired command. Please note that all Linux commands are case sensitive.

By: Unknown On 4:25 PM

Wednesday, June 18, 2014

Email Forwarding In Linux

Configure an email alias for your MTA such that mail sent to admin is received by the local user sowmya

CMD:

root@linuxstorages:~#vim /etc/aliases

admin: sowmya

:wq!

Reload the configuration file by using newaliases command

root@linuxstorages:~#newaliases

By: Unknown On 10:00 AM

Monday, June 16, 2014

How to configure NFS Server In Linux

Export your /central directory via NFS to the linuxstorages.com domain only.

CMD:

Install NFS packages using yum command

root@linuxstorages:~# yum install nfs* -y

Edit the nfs configuration file

root@linuxstorages:~#vim /etc/exports

/central *.linuxstorages.com(rw,sync)

:wq(save file)

Restart nfs service after configuring the configuration file.

root@linuxstorages:~#service nfs restart

root@linuxstorages:~#chkconfig nfs on

Use exportfs command to check configuration is working fine

root@linuxstorages:~#exportfs

By: Unknown On 7:58 PM

Friday, June 13, 2014

How to Mount Windows NTFS Partition in Linux

First you need to enable EPEL (Extra Packages for Enterprise Linux) Repository. You may refer the article on how to enable EPEL Repository under RHEL, CentOS and Fedora systems.

To mount any NTFS based filesystem, you need to install a tool called NTFS3G. Before heading up for installation let’s understand NTGS3G.

What is NTFS3G

NTFS3G is an open source cross-platform, stable, GPL licensed, POSIX, NTFS R/W driver used in Linux. It provides safe handling of Windows NTFS file systems viz create, remove, rename, move files, directories, hard links, etc.

Once EPEL is installed and enabled, let’s install ntfs-3g package using the below command with root user.

root@linuxstorages:~# yum -y install ntfs-3g

Fuse Install

Next, install and load FUSE driver to mount detected devices with below command. FUSE module is included in the kernel itself in version 2.6.18-164 or newer.

root@linuxstorages:~# yum install fuse

root@linuxstorages:~# modprobe fuse

Identify NTFS Partition

Once fuse module is loaded, type below command to find out NTFS Partitions in Linux.

root@linuxstorages:~# fdisk -l

Device Boot Start End Blocks Id System
/dev/sdb1 1 21270 7816688 b W95 FAT32

Mount NTFS partition

First create a mount point to mount the NTFS partition.

root@linuxstorages:~# mkdir /mnt/nts

Simply run the following command to mount the partition. Replace sda1 with your actual partition found.

root@linuxstorages:~# mount -t ntfs-3g /dev/sda1 /mnt/nts

Once it’s mounted on /mnt/ntfs, you may use regular Linux ls -l command to list the content of mounted filesystem.

By: Unknown On 2:23 PM

How to Convert DEB to RPM & RPM to DEB Packages

DEB - A Debian "package", or a Debian archive file, contains the executable files, libraries, and documentation associated with a particular suite of program or set of related programs. Normally, a Debian archive file has a file name that ends in .deb

RPM - Red Hat Package Manager or RPM Package Manager (RPM) is a package management system. The name RPM variously refers to the .rpm file format, files in this format, software packaged in such files, and the package manager itself. RPM was intended primarily for Linux distributions; the file format is the baseline package format of the Linux Standard Base.

1. Convert RPM to DEB

Install alien command on Debian / Ubuntu

Install alien command on Ubuntu as shown below.

# sudo apt-get install alien

Use alien command to convert rpm to deb file

The following example converts the linuxconf-devel rpm file to linuxconf-devel deb file. Once you generate the deb file, you can install it on Ubuntu or Debian.

# alien linuxconf-devel-1.16r10-2.i386.rpm

linuxconf-devel_1.16r10-3_i386.deb generated

Install deb packages using the dpkg command — Debian: How to Install or Remove DEB Packages Using dpkg

2. Convert DEB to RPM

Use alien to convert deb to rpm file

Use alient -r option to convert a deb file to rpm file. The following example converts libsox deb file to libsox
rpm file. Once you generate the rpm file, you can install it on Red Hat, or CentOS.

# sudo alien -r libsox1_14.2.0-1_i386.deb

libsox1-14.2.0-2.i386.rpm generated.

By: Unknown On 2:12 PM

Thursday, June 5, 2014

How To Configure Samba Server In Linux

Share the /central directory via SMB:

CMD:

Install smaba packages using yum

root@linuxstorages:~#yum install samba* -y

Configure samba configuration file

    root@linuxstorages:~#vim /etc/samba/smb.conf
    change workgroup as STAFF in line no 74

                   Add

                   [common]

                    Path = /central

                    Browseable = yes

                    Writeable = yes

                    Host allow = 192.168.0.

                    Valid user = sowmya

    :wq

Create shared directory

root@linuxstorages:~#mkdir /central

Create samba user and password

root@linuxstorages:~#smbpasswd -a sowmya

Use this command if selinux is enabled for selinux permission

root@linuxstorages:~#chcon -Rt samba_share_t /central

Restart samba service and enable in chkconfig

root@linuxstorages:~#service smb restart

root@linuxstorages:~#chkconfig smb on

check the share directory with the ipaddress

root@linuxstorages:~#smbclient //ipaddress/common -U sowmya

By: Unknown On 9:31 PM

Monday, June 2, 2014

How To Configure FTP Access In Linux

Configure FTP access on your system

CMD:

First install FTP packages in your system

root@linuxstorages:~#yum install vsftpd* -y

Edit hosts.deny file for deny particular domain

root@linuxstorages:~#vim /etc/hosts.deny

ADD following line in this file

vsftpd: ALL EXCEPT *.linuxstoraages.com

:wq!

Restart FTP service after change in configuration file

root@linuxstorages:~#service vsftpd restart

Add a ftp service in chkconfig

root@linuxstorages:~#chkconfig vsftpd on

By: Unknown On 7:55 PM

How To Configure SSH Access In Linux

Configure SSH access

CMD:

Install SSH server in your system using yum command

root@linuxstorages:~#yum install open-ssh-server* -y

Block ip which need to in hosts.deny file

root@linuxstorages:~#vim /etc/hosts.deny

ADD following line in this file

sshd: 192.168.1.1/255.255.255.0

:wq! (save file)

Restart the SSH service after changing configuration file

root@linuxstorages:~#service sshd restart

Enable in chkconfig service

root@linuxstorages:~#chkconfig sshd on

By: Unknown On 7:44 PM

Sunday, June 1, 2014

How To Enable Selinux Enforcing In Linux

A Red Hat® Certified Engineer (RHCE®) is a Red Hat Certified System Administrator (RHCSA) who possesses additional skills, knowledge, and abilities required of a senior system administrator responsible for Red Hat Enterprise Linux® systems.

An RHCE is capable of:

    Configuring static routes, packet filtering, and network address translation.
    Setting kernel runtime parameters.
    Configuring an Internet Small Computer System Interface (iSCSI) initiator.
    Producing and delivering reports on system utilization.
    Using shell scripting to automate system maintenance tasks.
    Configuring system logging, including remote logging.
    Configuring a system to provide networking services, including HTTP/HTTPS, File Transfer Protocol        (FTP), network file system (NFS), server message block (SMB), Simple Mail Transfer Protocol (SMTP), secure shell (SSH) and Network Time Protocol (NTP).

Enable SELINUX enforcing mode

CMD:

First check the selinux status by using getenforce commad

root@linuxstorages:~#getenforce
Premissive

Change the selinux status to enforcing in configuration

root@linuxstorages:~#vim /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#       enforcing - SELinux security policy is enforced.
#       permissive - SELinux prints warnings instead of enforcing.
#       disabled - SELinux is fully disabled.
SELINUX=enforcing
# SELINUXTYPE= type of policy in use. Possible values are:
#       targeted - Only targeted network daemons are protected.
#       strict - Full SELinux protection.
SELINUXTYPE=targeted

Restart the system

root@linuxstorages:~#init 6

Now check the status,

root@linuxstorages:~#getenforce
Enforcing

By: Unknown On 6:50 PM

Ip Forwarding In Linux

A Red Hat® Certified Engineer (RHCE®) is a Red Hat Certified System Administrator (RHCSA) who possesses additional skills, knowledge, and abilities required of a senior system administrator responsible for Red Hat Enterprise Linux® systems.

An RHCE is capable of:

    Configuring static routes, packet filtering, and network address translation.
    Setting kernel runtime parameters.
    Configuring an Internet Small Computer System Interface (iSCSI) initiator.
    Producing and delivering reports on system utilization.
    Using shell scripting to automate system maintenance tasks.
    Configuring system logging, including remote logging.
    Configuring a system to provide networking services, including HTTP/HTTPS, File Transfer Protocol (FTP), network file system (NFS), server message block (SMB), Simple Mail Transfer Protocol (SMTP), secure shell (SSH) and Network Time Protocol (NTP).

Enable IP forwarding

CMD:

root@linuxstorages:~#vim /etc/sysctl.conf

change from 0 to 1

root@linuxstorages:~#sysctl -p

By: Unknown On 6:17 PM

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