Turbo Charged SSH!!! June 1, 2010
Posted by networknuts in Uncategorized.Tags: linux delhi, linux training, linux video, networknuts, rhce, rhce boot camp, rhce delhi, rhce india, rhcss, rhcss boot camp, rhcss delhi, rhcss india, ssh, ssh-keygen, www.networknuts.net
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Video showing how to make SSH work real FAST.
For more interesting post, tips and tricks visit — www.networknuts.net
God Bless
Hacking password protected “single user” mode in Linux May 2, 2010
Posted by networknuts in Uncategorized.Tags: hacking single user mode, linux training, linux tutorials, linux video, redhat, redhat training, rhce, rhce boot camp, rhce delhi, rhce india, rhce video, rhcss, rhcss boot camp, rhcss delhi, rhcss india
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Single user mode can be protected by appending this line in /etc/inittab
su:S:wait:/sbin/nologin
if this line is present in the /etc/inittab – the machine will ask for root p@$$word
Hack
while booting p@$$ this kernel parameter –
init=/bin/bash
by p@$$ing this parameter, I am saying to the kernel, “rather than starting /sbin/init and proceed with the usual /etc/rc.d/* procedure, just simply give us a shell”. That means:
NO p@$$word checks
NO filesystem checks
NO startup environment
…as no filesystem checks has been made, the filesystem will be in read-only mode.
Now give this command, to make root filesystem writable.
mount -o remount, rw /
Once the p@$$word is reset or done anyother thing you wanted to do, DO NOT REBOOT.
mount -o remount, ro /
NOW PRESS THE RESET BUTTON
You can also see the video of this post
God Bless
Alok Srivastava
Linux Bash Shell Script to clear logs automatically – VIDEO April 25, 2010
Posted by networknuts in Uncategorized.Tags: bash shell script, linux bash scripting video, linux scripting, linux video, mcse delhi, mcse india, Network NUTS, rhce, rhce boot camp, rhce delhi, rhce india, rhcss boot camp, rhcss delhi, rhcss india
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Video by www.networknuts.net, showing how to create a linux bash shell script to clear logs automatically and carefully.
God Bless.
Split large file into smaller files – Linux April 10, 2010
Posted by networknuts in 1.Tags: how to split big file in linux, linux delhi, linux training, linux video, networknuts, redhat, redhat videos, rhce, rhce boot camp, rhce delhi, rhce india, rhcss, rhcss boot camp, rhcss delhi, rhcss india, rhcss training, rhel, split command
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Here is a small trick to split a big iso file (or any other big file) into smaller files of your desired size.
Use the SPLIT tool that comes with your OS.
Suppose I have a big iso file name “bigfile.iso” of size more than 3 GB and I want to split in into smaller iso files of size 1GB.
Here is how to do it:
split --byte=1024m bigfile.iso smallfile_
what this command will do?
It will actually split the bigfile.iso file into smaller files of size 1GB having names – smallfile_aa, smallfile_ab and so on…
So just enjoy the split, now.
And remember you can always use the CAT command to join them again:
cat smallfile_a* > newbigfile.iso
PS : Check out the video of this post at -http://www.youtube.com/watch?v=7Gv1FuLUH1o
God Bless.
Allow TELNET from ROOT April 6, 2010
Posted by networknuts in 1.Tags: allow telnet from root, networknuts, redhat, redhat videos, rhce, rhce boot camp, rhce delhi, rhce india, rhce training, rhcss, rhcss boot camp, rhcss india, rhcss training, telnet configuration, telnet server
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We all know that TELNET because of its weak authentication doesn’t allow “root” user to login.
But there is a TWEAK that will allow TELNET as ROOT.
STEP #1 – Install TELNET
yum install telnet-server
STEP #2 – Make TELNET active. Edit “/etc/xinetd.d/telnet” file and make
disable = no
STEP #3 – Configure PAM to allow TELNET as ROOT. Edit “/etc/pam.d/remote” file and find and comment this line
auth required pam_securetty.so
#auth required pam_securetty.so
STEP #4 – Restart the TELNET service
/etc/init.d/xinetd restart; chkconfig xinetd on
ENJOY the TELNET with ROOT credentials (at your own risk please)
God Bless.
PS: Check VIDEOS of interesting Linux tips and tricks on YOU-TUBE.
Configuring YUM server for automatic notification to clients March 31, 2010
Posted by networknuts in 1.Tags: linux video, redhat tutorials, rehdat, rehdat linux video, rhce, rhce boot camp, rhce delhi, rhce india, rhce training, rhce video, rhcss, rhcss boot camp, rhcss delhi, rhcss india, www.networknuts, yum linux, yum server configuration linux
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We have a situation. We have 100+ client machines in our network and whenever some new package is available on YUM, I want all the clients to get updated for the new package via email so that they can use the package, if they need.
How to configure YUM to send email for updates available on server.
STEP #1 – Edit /etc/yum/yum-updatesd.conf
STEP #2 – Edit / Add these lines:
emit_via = email
email_to = staff@yourdomain.com
email_from = yumserveradmin@yumserver.example.com
STEP #3 - Save and Restart the service.
service yum-updatesd restart
chkconfig yum-updatesd on
So now your YUM server will be sending a email to staff user (it can be aliased in your MTA configuration) whenever a new package is available.
Check the video of this post on http://www.youtube.com/user/networknutsdotnet
God Bless.
Configuring, Managing and Tuning Swap Memory in Linux – Video March 26, 2010
Posted by networknuts in 1.Tags: linux delhi, linux videos, redhat, redhat linux, rhce, rhce boot camp, rhce delhi, rhce india, rhcss, rhcss boot camp, rhcss delhi, rhcss india
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See the video of – Configuring, Managing and Tuning Swap Memory in Linux via youtube.
http://www.youtube.com/watch?v=1q_05tD2gzY
Please comment, rate and subscribe the channel to get latest updates from Network NUTS.
God Bless.
