Cisco Nexus 1000V

Posted on February 10th, 2010 in Data Center, Tips, Virtualization, vSphere | No Comments »

Today I was setting up the Nexus 1000V with Cisco UCS, and this was my 2nd time of experiencing the nexus 1000V. Previous experience when I did the 1st installation and configuration on Nexus 1000V, it take me few days to get it done, but it only took us 1 few hours to do so with a help from my colleague who are the networking expert. I was using the Nexus 1000V version 1.2 which is greatly enhance and simplify VS the version 1.

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How to enable ssh in vSphere 4i

Posted on May 29th, 2009 in Tips, Virtualization, vSphere | 7 Comments »

To have SSH enable on vSphere 4i is always important and helpful when you require to troubleshoot any problem you may face. The way to get this done should similar as esx 3i.

  1. First, you press Alt + f1 then type “unsupported” and press enter.
  2. You will see the prompt for password after this. Key in the root password you had previously configure, and you will be able to log in to the service console.
  3. Follow by that, do a vi /etc/xinetd.conf and look for #ssh. Remove the # and save the file after this.
  4. Go to /sbin, and run this command ./services.sh restart
  5. Noted: If you still having problem with SSH access, please restart and it should be work.

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Missing VM Template

Posted on October 20th, 2008 in Tips | 1 Comment »

Few days ago, one of my virtual center machine was crashed and my Microsoft SQL database was corrupted without backup(damm!).

Basically setting up a brand new Windows 2003 machine is pretty simple but setup a new Virtual Machine took me 2 days. The most important is my VM template is go missing. The quick solution is search for VM template and register (add to inventory) again.

SSH into my ESX server using putty and search for VM template file with extension “.vmtx”.

[root@malaysiavmesx01 vmfs]# find /vmfs -name *.vmtx
/vmfs/volumes/465eeddb-89b75750-a52d-011aa0289d15/W2K3STD/W2K3STD.vmtx
/vmfs/volumes/465eeda7-2a63d436-724b-011aa0289d15/RHEL5/RHEL5.vmtx

How to register a VM template using CLI:
[root@malaysiavmesx01 vmfs]# /usr/bin/vmware-cmd -s register

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Linux Systems Being Hit By SSH-Key Attacks (ESX)

Posted on August 28th, 2008 in Announcement, Industry News, Virtualization | No Comments »

Latest news that Linux had been potentially attack by some of the method it use to steal the SSH key to gain root access to the potential system.

According to US-CERT, the attack appears to rely on stolen SSH keys to gain access to a system. It then uses a local kernel exploit to gain root access, whereupon it installs the “phalanx2” rootkit, derived from the older “phalanx” rootkit.

Since the ESX server is running on Linux kernel, I will strongly recommend we should keep an eye on the ESX host to ensure this is not impacted. That could become a serious impact to the virtualization.
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Experience on VMware ESX 3.5 and ESX 3.5i

Posted on August 26th, 2008 in Virtualization | 1 Comment »

I had tested both environment with my test machine which is DELL Precesion Workstation with 2 x 2.0 Quad core, which had total of 17GB ECC memory loaded with 3 SATA disk contain more than 1TB local storage. Below is the comparison I had done during the test.

Installation – ESX 3.5i had advantages as the entire process is fast and simple. ESX 3.5 require more interaction as it looks similiar to Linux installation. I know the ESX 3.5 can be script and customize by using the ks.cfg which I had done previously for mass deployment. For comparison 1 to 1, ESX 3.5i is much more easier and faster.

Configuration – Basically I dun really find much different as I do manage this machine with my virtual center. The only different is the Linux connection and command no longer usable on ESX 3.5i. By the way, I read some artical to tweak around to make the SSH work on the 3.5i, but I will prefer to proceed with powershell or CLI if I do need to use command prompt.

Perfomance – ESX 3.5i had better through put. In my test, I created 3 VM which 2 of them running on Windows 2003 SP2 with 4GB memory and 4Vcpu, plus additional 1 VM with SUSE Linux. I did the same on ESX 3.5 too. The respond on the ESX 3.5i is much smooth and not lacking, as ESX 3.5 you will see some lacking from the console open on Virtual center.  Follow by file copy test, the VM on ESX 3.5i is slightly faster than ESX 3.5. just less than a minute faster which I tried to copy some file with 20GB. Beside these points, I had not found anything different.
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