Remote Desktop (rdesktop) in Redhat/Fedora/CentOS

About Rdesktop

Rdesktop application is use to connect RDP (Remote Desktop Protocol) of any Operating System like Windows XP, Window NT, Windows 2003/2008, Windows Vista and Windows 7 from Linux machine. It’s a client utility for Remote Desktop Protocol (RDP). In this article we are going to view how we can take remote desktop of Windows Terminal using Hostname and IP Address.

Please make sure following points before connecting to remote host.

1. Enable RDP port no. 3389 in Firewall.
2. Enable remote desktop under Windows Operating System.
3. Require at least one user with password.
4. Under MS-Windows desktop >> Right Click on My Computer >> Select properties >> Select Remote tab >> Enable Remote desktop >> Save the changes.

Install rdesktop (Remote Desktop)

#rpm -qa rdesktop

#yum -y install rdesktop


How to use rdesktop with hostname
To connect Windows host from Linux desktop type following command using -u parameter as username (narad) and (ft2) as hostname of my Windows host. To resolve host name make entry at /etc/hosts file if you don’t have DNS Server in your environm


rdesktop -u user_login IP_Host

example :

#rdesktop -u administrator 192.168.1.7

mssql_connect() not working on centos 6.2 / 6.5

server: centos 6.2
PHP Version 5.3.3

had install: freetds; ODBC; php_mssql
selinux was disable
mssql.so was enable in php.ini

for install freetds on centos click here 

if finish restart your server

How to Install Configure FreeTDS on centos 6.5

FreeTDS is a set of libraries for Unix and Linux that allows your programs to natively talk to Microsoft SQL Server and Sybase databases.

Technically speaking, FreeTDS is an open source implementation of the TDS (Tabular Data Stream) protocol used by these databases for their own clients. It supports many different flavors of the protocol and three APIs to access it.
Additionally FreeTDS works with other software such as Perl and PHP, providing access from those languages as well.


Well i will use this to connect my Perl Scripts to SQL Server Databases in CentOS.
Currently in 6.5 using yum, version installed is not working correct with Perl DBD Module. By this reason i need to do this task manually from scratch.

Requirement

RHE EPEL Repository
You must have make and gcc commands installed on your system
1.Install UnixODBC Package

[root@localhost ~]# yum install unixODBC unixODBC-devel

2. Install freeTDS Package

[root@localhost tmp]# wget ftp://ftp.astron.com/pub/freetds/stable/freetds-stable.tgz
[root@localhost tmp]# tar xfvz freetds-stable.tgz
[root@localhost freetds-stable]# cd [your freetds folder]
[root@localhost freetds-stable]# ./configure --prefix=/usr/local/freetds
[root@localhost freetds-stable]# make
[root@localhost freetds-stable]# make install
[root@localhost freetds-stable]# ln -s /usr/local/freetds/etc/freetds.conf /etc/freetds.conf

jquery loading animation

you can add loading animation on even submit.
before add loading animation, you can make a loading animation here
download  and then make id default value on ready function $('#wait').hide();
and then show loading animation like here,

$('#form').submit(function() {
    $.ajax({
        url: '/whatever.php',
        beforeSend: function() { $('#wait').show(); },
        complete: function() { $('#wait').hide(); }
    });
    return false;
});

how to install virtualBox 4.3 on Fedora/CentOS/RHEL

Oracle VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.
VirtualBox supports a large number of guest operating systems:
Windows 3.x
Windows NT 4.0
Windows 2000
Windows XP
Windows Server 2003
Windows Vista
Windows 7
Windows 8
Windows 8.1
DOS
Linux (2.4, 2.6, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 3.10, 3.11)
Solaris
OpenSolaris
OpenBSD
This guide shows howto install VirtualBox 4.3 (currently 4.3.20) on Fedora 21/20/19/18/17, CentOS 7/6.6/5.11, Red Hat (RHEL) 7/6.6/5.11. This guide uses Virtual Box own yum repositories.
Note: Fedora 16 users can install VirtualBox 4.2, Fedora 15/14 users can install VirtualBox 4.1, Fedora 13 users can install VirtualBox 4.0 and Fedora 12 users can install VirtualBox 3.2.

1. Change to root User
#su -

2. Install Fedora or RHEL Repo Files
#cd /etc/yum.repos.d/


Fedora 21/20/19/18/17/16/15/14/13/12 users
#wget http://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo

CentOS 7/6.6/5.11 and Red Hat (RHEL) 7/6.6/5.11 users
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo

How to install google chrome on centos 6

Download application from 
# wget http://chrome.richardlloyd.org.uk/install_chrome.sh

Change user access
# chmod +x install_chrome.sh

and then Install application 
# sh install_chrome.sh

Samba Error Multiple connections to a server or shared resource by same user, ..

How to fix samba error on windows client :
"Multiple connections to a server or shared resource by same user, using more than one username, are not allowed. Disconnect all previous connections to the server or shared resource and try again"

Solution
Windows by default stores a cache of all the network drives accessed so that next time when you try to access the same path it will take the credentials from the cache without prompting for username/password again.


In such cases you need to clear the cache. 

How do we do that?
Go to your windows machine and open the cmd prompt

C:\Users\Deepak>net use
New connections will be remembered.
Status       Local     Remote                    Network
-------------------------------------------------------------------------------
OK                     \\192.9.18.6\common        Microsoft Windows Network
The command completed successfully.


As you see above a single cache entry is there in my windows machine for //192.9.18.6, so next time if I try to access this share with some other username/password, I would get the same error.

So we will have to clear this cache

C:\Users\Deepak>net use /delete \\192.168.0.100\IPC$
\\192.168.0.100\IPC$ was deleted successfully.

C:\Users\Deepak>net use
New connections will be remembered.

There are no entries in the list.


or 

If you are using active directory, you can add script ".bat"  on your server for automatically mapping.
add netlogon samba : /var/lib/samba/netlogon/name_logon.bat

with value of file .bat like this  :

net time \\192.9.18.6 /set /yes
net use m: /delete /y
net use m: \\192.9.18.6\common

How to remove all file of same extension files in directory linux

Insert into folder 
and then delete all file of same extention file *.txt

# find . -name "*.txt" -type f -delete

How to install RapidSVN on Centos 6

Download rapidsvn the latest epel-release rpm from
http://dl.fedoraproject.org/pub/epel/6/x86_64/


Install epel-release rpm:
# rpm -Uvh file_name_rapidsvn.rpm


if you are found error: Failed dependencies:
please install library dependencies  using yum search or download from http://pkgs.org/centos-6/epel-x86_64/rapidsvn-0.12.0-3.el6.x86_64.rpm.html


Install rapidsvn rpm package:
# yum install rapidsvn


reff :
http://pkgs.org/centos-6/epel-x86_64/rapidsvn-0.12.0-3.el6.x86_64.rpm.html

find file in linux with command terminal

example  : Find file with extention .pdf


# find /home -type f -name "*.pdf"

Extract Files tar on linux

How to extract or uncompress a file from tar ball downloaded from the Internet under Linux using bash command prompt?

Extract or Unpack a TarBall File

To unpack or extract a tar file, type:

tar -xvf file.tar

To save disk space and bandwidth over the network all files are saved using compression program such as gzip or bzip2. To extract / unpack a .tar.gz (gzip) file, enter (note -z option):

tar -xzvf file.tar.gz

To extract / unpack a .tar.bz2 (bzip2) file, enter (note -j option):

tar -xjvf file.tar.bz2

Where,
-x : Extract a tar ball.
-v : Verbose output or show progress while extracting files.
-f : Specify an archive or a tarball filename.
-j : Decompress and extract the contents of the compressed archive created by bzip2 program (tar.bz2 extension).
-z : Decompress and extract the contents of the compressed archive created by gzip program (tar.gz extension).

Setting Autentification Postfix Mail dan Dovecot with user LDAP on Centos 6

Edit Postfix config :

vim /etc/postfix/ldap-aliases.cf

bind = no
version = 3
timeout = 20
size_limit = 1
expansion_limit = 0
start_tls = no
tls_require_cert = no
server_host = ldap://192.9.18.25
search_base = ou=Groups,dc=server,dc=co,dc=id
scope = sub
query_filter = (mail=%s)
result_attribute = mgrpDeliverTo
special_result_filter = %s@%d
                     

vim /etc/postfix/ldap-users.cf

bind = no
version = 3
timeout = 20
size_limit = 1
expansion_limit = 0
start_tls = no
tls_require_cert = no
server_host = ldap://192.9.18.25
search_base = ou=Groups,dc=server,dc=co,dc=id
scope = sub
query_filter = (mail=%s)
result_attribute = mgrpDeliverTo