Linux Commands Examples

Posted on July 25, 2012 by Gkhan

find                                              Search files and folders

crontab                                       Schedules the jobs

ls                                                  Directory listing

iptables                                       Firewall

netstat                                         Connection status

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Cisco UCS important Links

Posted on July 23, 2012 by Gkhan

Cisco UCS Site prepration Guide Download here

Cisco UCS 5108 Hardware Installation Guide Download here

Cisco UCS 6100 Series Fabric Interconnect Hardware Specs Download here

Cisco UCS 6100 Series Fabric Interconnect Hardware installation Guide  here

Cisco Data Center Infrastructure 2.5 Design Guide Download here

Cisco Validated Designs  Download here

UCS Network Configuration for Unified CCE Download here

Unified Communications Virtualization Deployment Guide On UCS B-Series Blade Servers Download here

Cisco SBA UCS C-Series and VMware Deployment Guide  Download here

Best Practices in Deploying Cisco Nexus 1000V Series Switches on Cisco UCS B and C Series Cisco UCS Manager Servers Download here

Compare Cisco UCS Blades Models Download here

Data Center Interconnect Design Guide for Virtualized Workload Mobility with Cisco, EMC, and VMware Download here

Cisco UCS Upgrading Cisco UCS From 1.4 To 2.0 Download here    (Video Part-1 Part-2 Part-3)

Cisco UCS General Troubleshooting Steps and Solutions Click here

Cisco Nexus 1000V Series Switches Install and Upgrade Guides Click here

Upgrade BIOS on Cisco UCS Server Blade click here

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How to create NFS Share on CentOS

Posted on July 19, 2012 by Gkhan

How to create NFS Share on CentOS

NFS services should be install  check the services

service nfs status

which folder you want to share for Example /home/ISOFiles

NFS share information kept in /etc/exports file

so edit the file and add your share information

nano /etc/exports

add the line for your share and the host or network information who will access this share and permission

/home/ISOFiles 192.168.1.0/255.255.255.0(rw,sync)

save and exit

Now allow hosts to access

nano /etc/hosts.allow

add below line

portmap: 192.168.1.0/255.255.255.0

Now restart the nfs and portmap services

service nfs restart

service portmap restart

Note:- Firewall ports should be open for NFS

            Permission should be assigned on folder for users

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How to transfer files between linux and windows over ssh

Posted on July 8, 2012 by Gkhan

1- how to transfer files between linux servers over ssh

#scp source  username@destination ip:/destination path

For example :- I want to transfer files from local linux machine to remote linux server over ssh

#scp abc.tar  root@192.168.1.1:/var/

How to transfer files between Windows  to Linux  over ssh.

download winscp from link http://winscp.net/eng/download.php

Install winscp

Login to your Linux server Now you would be able to transfer file from windows to linux and linux to windows over ssh.

For more help click here

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How to get hard drive utilization report of remote computers

Posted on July 5, 2012 by Gkhan

How to get hard drive utilization report of remote computers

This script will get a list of computers and output the hard drive information to a pretty html file. You can also just specify the computer(s) on the command line or use a list of computers. Browser will open with the report when completed. drivereport.htm file saved to same location.

Download Powershell Script  

Save and open script file in notepad and Change the following line with your Computers.txt location.

Param (
$computers = (Get-Content  “D:\HDDReport\Computers.txt”)
)

Add all your computers name in Computers.txt file as Example below

Computer1
Computer2
Computer3
etc

Note:- you must be having admin rights on computers which you want Hard drive report and you must be able to ping computers by computers name.

if you have problem to run powershell script  then try this command  (Set-ExecutionPolicy RemoteSigned)or go to reference  link

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How to configure Microsoft iSCSI

Posted on July 5, 2012 by Gkhan

How to configure Microsoft iSCSI

The Microsoft iSCSI Software Initiator enables connection of a Windows host to an external iSCSI storage array using Ethernet NICs. This download can be installed on Windows Server 2003, Windows XP, and Windows 2000. For Vista and Windows Server 2008, the iSCSI initiator is included inbox. The Microsoft iSCSI software initiator makes it possible for businesses to take advantage of existing network infrastructure to enable block-based Storage Area Networks without having to invest in additional hardware.

Supported architectures include x86, x64(both Intel and AMD), and IA64 platforms
For More information and guide download click here

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Windows update Troubleshooting

Posted on July 5, 2012 by Gkhan

Windows update Troubleshooting

Use below command for detecting windows updates

wuauclt /detectnow

Restart the services
net stop wuauserv
net start wuauserv

wuauclt /r /ReportNow

If things still aren’t working, the Windows Update log can be found at   ( %systemroot%\WindowsUpdate.log.)
The log file — strangely verbose, for Microsoft — is just text and viewable in Notepad. If the server you’re
trying to connect to is crapping out, or your group policy is pointing you to the wrong server, the proof will be in there.

wuauclt.exe /resetauthorization /detectnow

/DetectNow – request the Windows Update Agent to do a scan

/ReportNow – when using this, use it in combination with /DetectNow, so wuauclt.exe /DetectNow /ReportNow to get the Windows Update Agent to scan and send the reporting events to the WSUS mothership

/RunHandlerComServer

/RunStoreAsComServer

/ShowSettingsDialog – invokes the CPL UI for the current AU settings

/ResetAuthorization – resets the authorization cookie

/ResetEULAs – resets the EULA that have been accepted?

/ShowWU – shows the Windows Update page or CPL (in Vista or later)

/ShowWindowsUpdate – shows the Windows Update page or CPL (in Vista or later)

/UpdateNow – seems like it wants to start a download and install

/DemoUI -shows the shield for WU and pops the balloon

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SSH Session recording script

Posted on July 4, 2012 by Gkhan

SSH Session recording script

If you want to record your root ssh session  create a file .bash_profile  . and copy below line by line change the email address where you want to recive the SSH log mail.

nano /root/.bash_profile

CURDATE=$(date +%F-%T)

RAND=$RANDOM

EMAILS=”user@example.com otherrecipient@example.com”

script -f -q /tmp/session-$USER-$CURDATE-$RAND.log

for EMAIL in $EMAILS; do

cat “/tmp/session-$USER-$CURDATE-$RAND.log” | mail -s “SSH session transcript for $USER at $CURDATE” $EMAIL

 

done

rm -f /tmp/session-$USER-$CURDATE-$RAND.log

exit

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Backup in Linux

Posted on July 4, 2012 by Gkhan

Backup in Linux

$ tar   cvf    backup.tar  .

C = create an archive

V = verbose mode

f = file name

. = current directory

Display the content of tar file

$ tar  tvf   backup.tar

t = table of content

To extract tar file

$ tar  xvf  backup.tar

X = extract

Using tar with compression

$ tar  zcvf  backup.tgz  .

z = gzip compression

c = create archive

.   = current directory

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IP address calculation rule

Posted on July 4, 2012 by Gkhan

IP address calculation rule

How to get Block size of given subnet mask

Subnet mask -256

Example:-   Given subnet mask = 255.255.255.248

Block Size will be  256 – 248 = 8

Usable IPs will be    8 – 2 = 6

Because first IP will be used for Network ID and Last IP will be used for Broadcast

How to get Block Size of given Bit

32 Bit – given Bit = x bit     Block Size   (2) the power     x bit

For Example:-  Given IP address range is 8.12.172.100 /29

Block Size will be    32 bit – 29 bit = Block size 3 bit              (2)3 = 2x2x2 = 8

So there will be 8 subnets    To get first IP subnet Block 256 / Block Size

For Above Block Example    256 /8 = 32

1-      Block   0 – 31

2-      Block   32- 63

3-      Block  64 –95

4-       Block 96 – 127

5-      Block 128 – 159

6-      Block 160 – 191

7-      Block 192 – 223

8-      Block 224 – 256

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