Dig Howto

Instead using nslookup use dig,  in RHEL distro, dig is part of bind-utils package.
http://www.madboa.com/geek/dig/

How to SMTP Auth in Sendmail (CentOS)

By default sendmail-cf  is not installed in CentOS:

yum install sendmail-cf

Then edit /etc/mail/sendmail.mc and add this:

TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

compile the new configuration:

make -C /etc/mail/

saslauthd must by running:

/etc/init.d/saslauthd start 

and make it available on startup:

chkconfig  saslauthd on

then restart sendmail:

/etc/init.d/sendmail restart

and it's ready to use
For a powerful mail server, you can combine this configuration with MailScanner, clamav and grey-list.

Risk Management Strategy for the Provide Domain Name Resolution Services Critical Function

http://www.dhs.gov/xlibrary/assets/it-sector-risk-management-strategy-domain-name-resolution-services-june2011.pdf

Unix file compression utilities

to compress and zip:

tar -czvf archive.tgz files/

 more info

http://www.fluidthoughts.com/howto/tar-gzip/

Virtualization in Linux, KVM way by IBM

Well documented information at:
http://publib.boulder.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=/liaat/liaatkvm.htm&sf1617284=1

vi intro -- the cheat sheet method by Daniel Robbins

vi,  useful  cheat sheet
http://www.ibm.com/developerworks/linux/tutorials/l-vi/

How to add rpmforge repo to CentOS 5.5

x86_64 version

 wget http://dag.wieers.com/rpm/packages/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm

rpm -ivh rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm

You can disable the rpmforge repo in /etc/yum.repos.d/rpmforge.repo
and changed enabled = 1 to enabled = 0

Source

http://blog.bloke.com/2010/05/enable-rpmforge-for-centos-5-5-for-subversion-1-6/

Updating time on Linux

First install NTP
yum install ntp
 then update by a remote NTP server
ntpdate my.server.xx

or set manually
date mmddHHMM[YYyy]

CentOS 5 poptop how to

I like short answers

rpm -Uvh http://pptpclient.sourceforge.net/yum/stable/rhel5/pptp-release-current.noarch.rpm
yum install kernel_ppp_mppe dkms ppp pptpd

Here is the source

http://pptpclient.sourceforge.net/yum/

LVM support on Ubuntu

short answer :)

Install lvm2:
$ sudo apt-get install lvm2

Load the necessary module(s):
$ sudo modprobe dm-mod

Scan your system for LVM volumes and identify in the output the volume group name that has your Fedora volume (mine proved to be VolGroup00):
$ sudo vgscan

Activate the volume:
$ sudo vgchange -ay VolGroup00

Create a mount point for that volume:
$ sudo mkdir /mnt/fcroot

Mount it:
$ sudo mount /dev/VolGroup00/LogVol00 /mnt/fcroot -o ro,user


long answer :)

http://www.linuxquestions.org/questions/fedora-35/how-can-i-mount-lvm-partition-in-ubuntu-569507/

Linux, how to delete files based on specific date.

# rm -vif `ls -lh | grep 'Aug 26' | awk '{print $9}'`

Fixing "specifies multiple packages" , CentOS

rpm -e --allmatches the_package

My Twitter acount

Hi, this is my Twitter acount
Genaraly speaking about tech news and computer stuffs

http://twitter.com/jfloreslizana

How to clean Squid cache from console and other stuffs

As a Linux fan I will post some interestings links like this

http://www.squid-cache.org/Doc/FAQ/FAQ-7.html