how to Configure proxy (Squid) on RHEL 6.3 & Centos 6.3

# install squid* -y
# vim /etc/squid/squid.conf

1 visible_hostname Murad Proxy server

30 acl mynetworks src 192.168.0.0/24
31 acl badsite dstdomain "/etc/squid/badsite.conf"
35 http_access deny badsite
36 http_access allow mynetworks
66 http_port 3128 transparent

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How to install wine on RHEL 6.3 & Centos 6.3

Install Howto

Download the latest epel-release rpm from

(a) http://dl.fedoraproject.org/pub/epel/6/SRPMS/epel-release-6-8.src.rpm

(b) http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm

Install epel-release rpm:
```
# rpm -Uvh epel-release*rpm
```

Install epel-release rpm package:

# yum install epel-release

#yum list all;

#yum update all;

#yum install wine* -y;

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###################### GET Magic ########################

{- Can you Play Piano?, Let's try it Online -}

Hello viewers, Welcome back to my blog. Now a days, it is known to us, that Google makes some awesome Doodles in every special occasions, as, Historical moments, Famous person's birthdays etc etc. Do you remember? that Piano or Moog's invention? which was playable directly on google page? Yeah I just bring it back, to entertain you. So why are you wating for. Lets play it. . .

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RHEL 6.3 ,CentOS 6.3,Scientific Linux 6.3 Archives and compressed files

Command	Description
# bunzip2 file1.bz2	decompress a file called 'file1.bz2'
# bzip2 file1	compress a file called 'file1'
# gunzip file1.gz	decompress a file called 'file1.gz'
# gzip file1	compress a file called 'file1'
[root@server1 ~]# tar –cvf archive_name source [root@server1 ~]# cd /etc/ [root@server1 etc] # tar -cvf /bakup/resolv.tar resolv.conf [root@server1 etc]# cd /bakup/ [root@server1 bakup]# ls -l total 12 -rw-r--r-- 1 root root 10240 Dec 18 18:30 resolv.tar	Create tar extension file
[root@server1 bakup] # tar -xvf /bakup/resolv.tar [root@server1 bakup]# ls resolv.conf resolv.tar	Extract from tar file
[root@server1 bakup] # gzip -v /bakup/resolv.tar /bakup/resolv.tar: 98.6% -- replaced with /bakup/resolv.tar.gz [root@server1 bakup]# ls resolv.conf resolv.tar.gz	For Compress
[root@server1 bakup] # gunzip -v /bakup/resolv.tar /bakup/resolv.tar.gz: 98.6% -- replaced with /bakup/resolv.tar [root@server1 bakup]# ls resolv.conf resolv.tar	UnCompress
[root@server1 ~]# ps	Show current Process
[root@server1 ~]# pstree	Show current process with tree
[root@server1 ~]# uptime	How many times are system start
[root@server1 ~]# top	System process monitor
[root@server1 ~]# pstree \| less	Show process with tree
[root@server1 ~]# iostat	Show system process & Idle time
[root@server1 ~]# hostname server1.example.com	Check Host name
[root@server1 ~]# ntsysv	Show runlevel list
[root@server1 ~]# setup	For network configuration,authentication
[root@server1 ~]#chkconfig vsftpd on	Automaticaly on vsftpd on system reboot

RHEL 6.3,Centos 6.3 ,Scientific Linux 6.3 Shutdown, Restart and Logout of a system Command

Command	Description
# init 0	shutdown system
# logout	leaving session
# reboot	reboot
# shutdown -h now	shutdown system
# shutdown -h 16:30 &	planned shutdown of the system
# shutdown -c	cancel a planned shutdown of the system
# shutdown -r now	reboot
# telinit 0	shutdown system
# halt	For shutdown system

RHEL 6.3 ,CentOS 6.3 ,Scientific Linux 6.3 Advanced Linux Command

Advanced Command

Command	Description
[root@server1 /]# ls [root@server1 ~]# ls anaconda-ks.cfg Documents file1 install.log.syslog Pictures TemplatesDesktop Downloads install.log Music Public Videos	Show list of directory
[root@server1 ~]# ls –a [root@server1 ~]# su user1 [user1@server1 root]$ cd [user1@server1 ~]$ ls -a . .. .bash_history .bash_logout .bash_profile .bashrc .gnome2 .mozilla .viminfo	Show hidden content of a directory
[user1@server1 ~]$ su root Password: [root@server1 user1]# cd [root@server1 ~]# ls -l total 104 -rw-------. 1 root root 2467 Dec 15 20:25 anaconda-ks.cfg drwxr-xr-x. 2 root root 4096 Dec 18 02:04 Desktop drwxr-xr-x. 2 root root 4096 Dec 16 00:34 Documents drwxr-xr-x. 2 root root 4096 Dec 16 00:34 Downloads	Show Content list with Permission
[root@server1 ~]# ls -lh total 104K -rw-------. 1 root root 2.5K Dec 15 20:25 anaconda-ks.cfg drwxr-xr-x. 2 root root 4.0K Dec 18 02:04 Desktop drwxr-xr-x. 2 root root 4.0K Dec 16 00:34 Documents drwxr-xr-x. 2 root root 4.0K Dec 16 00:34 Downloads	Show content total & Individual Content size.
[root@server1 ~]# ls -lt total 148 -rw-r--r-- 1 root root 46974 Dec 18 04:02 install.log	List by Modification
[root@server1 ~]# ls install.log Music Public Videos anaconda-ks.cfg Documents file1 install.log.syslog Pictures Templates [root@server1 ~]# more install.log	Show content with list Then press Enter
[root@server1 ~]# clear	Clear Screen
[root@server1 ~]# tree	Content show with tree diagram
[root@server1 ~]# rmdir [root@server1 ~]# mkdir 1 [root@server1 ~]# rmdir 1	Remove Emtpy directory
[root@server1 ~]# hwclock Tue 18 Dec 2012 04:20:34 AM BDT -0.924766 seconds	Show DATE & TIME
[root@server1 ~]# history 10	Show content history
[root@server1 ~]# mail	mail from /var/spool/mail
[root@server1 ~]# locate resolv.conf /etc/resolv.conf /etc/sysconfig/networking/profiles/default/resolv.conf /usr/share/man/man5/resolv.conf.5.gz	Search file or service from full system Last update #updatedb

Postfix,SMTP Email Server on CentOS 6.3 OR Scientific Linux 6.3,RHEl 6.3

Final Postfix dovcot Server configure & test

[root@server1 ~]# service postfix status;service postfix restart;chkconfig postfix on;
master is stopped
Shutting down postfix:                                     [FAILED]
Starting postfix:                                          [ OK ]
[root@server1 Desktop]# service postfix status;service postfix restart;chkconfig postfix on;
master (pid 3261) is running...
Shutting down postfix:                                     [ OK ]
Starting postfix:                                          [ OK ]
service postfix status;service postfix restart;chkconfig postfix on;
master is stopped
Shutting down postfix:                                     [FAILED]
Starting postfix:                                          [ OK ]
[root@server1 ~]# service postfix status;service postfix restart;chkconfig postfix on;
master (pid 3261) is running...
Shutting down postfix:                                     [ OK ]
Starting postfix:                                          [ OK ]
yum install postfix dovecot squirrelmail -y
Loaded plugins: refresh-packagekit, security
other                                                                                                 | 1.3 kB     00:00 ...
Setting up Install Process
Resolving Dependencies
There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.
--> Running transaction check
---> Package dovecot.x86_64 1:2.0.9-2.el6_1.1 will be installed
---> Package postfix.x86_64 2:2.6.6-2.2.el6_1 will be installed
---> Package squirrelmail.noarch 0:1.4.22-3.el6 will be installed
--> Processing Dependency: php for package: squirrelmail-1.4.22-3.el6.noarch
--> Running transaction check
---> Package php.x86_64 0:5.3.3-3.el6_2.8 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================
Package                        Arch                     Version                                Repository              Size
=============================================================================================================================
Installing:
dovecot                        x86_64                   1:2.0.9-2.el6_1.1                      base                   1.9 M
postfix                        x86_64                   2:2.6.6-2.2.el6_1                      base                   2.0 M
squirrelmail                   noarch                   1.4.22-3.el6                           base                   4.1 M
Installing for dependencies:
php                            x86_64                   5.3.3-3.el6_2.8                        base                   1.1 M

Transaction Summary
=============================================================================================================================
Install       4 Package(s)

Total download size: 9.2 M
Installed size: 39 M
Downloading Packages:
-----------------------------------------------------------------------------------------------------------------------------
Total                                                                                         34 MB/s | 9.2 MB     00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : 2:postfix-2.6.6-2.2.el6_1.x86_64                                                                          1/4
Installing : php-5.3.3-3.el6_2.8.x86_64                                                                                2/4
Installing : squirrelmail-1.4.22-3.el6.noarch                                                                          3/4
Installing : 1:dovecot-2.0.9-2.el6_1.1.x86_64                                                                          4/4
Verifying : squirrelmail-1.4.22-3.el6.noarch                                                                          1/4
Verifying : 1:dovecot-2.0.9-2.el6_1.1.x86_64                                                                          2/4
Verifying : php-5.3.3-3.el6_2.8.x86_64                                                                                3/4
Verifying : 2:postfix-2.6.6-2.2.el6_1.x86_64                                                                          4/4

Installed:
dovecot.x86_64 1:2.0.9-2.el6_1.1        postfix.x86_64 2:2.6.6-2.2.el6_1        squirrelmail.noarch 0:1.4.22-3.el6

Dependency Installed:
php.x86_64 0:5.3.3-3.el6_2.8

Complete!
############################### STEP 02 ##################################
[root@server1 ~]# service postfix status;service postfix restart;chkconfig postfix on;
master is stopped
Shutting down postfix:                                     [FAILED]
Starting postfix:                                          [ OK ]
[root@server1 ~]# service postfix status;service postfix restart;chkconfig postfix on;
master (pid 3261) is running...
Shutting down postfix:                                     [ OK ]
Starting postfix:                                          [ OK ]
service postfix status;service postfix restart;chkconfig postfix on;
master is stopped
Shutting down postfix:                                     [FAILED]
Starting postfix:                                          [ OK ]
[root@server1 ~]# service postfix status;service postfix restart;chkconfig postfix on;
master (pid 3261) is running...
Shutting down postfix:                                     [ OK ]
Starting postfix:                                          [ OK ]
################################## STEP 03 #####################################
[root@server1 ~]# vim /etc/postfix/main.cf

Change

From

75 #myhostname = host.domain.tld
83 #mydomain = domain.tld
99 #myorigin = $mydomain
113 #inet_interfaces = all
116 inet_interfaces = localhost
164 mydestination = $myhostname, localhost.$mydomain, localhost
165 #mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
419 #home_mailbox = Maildir/

To

75 myhostname = mail.example.com
83 mydomain = example.com
99 myorigin = $mydomain
113 inet_interfaces = all
116 #inet_interfaces = localhost
164 #mydestination = $myhostname, localhost.$mydomain, localhost
165 mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
419 home_mailbox = Maildir/
:wq save and quit

[root@server1 ~]# service postfix restart;chkconfig postfix on;service postfix status;
Shutting down postfix:                                     [ OK ]
Starting postfix:                                          [ OK ]
master (pid 3604) is running...

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