VirtualSingh

VirtualSingh

VirtualSingh

Sunday, 15 October 2017

Join a host to active directory domain

03:10 0
Join a host to active directory domain

Thursday, 17 August 2017

Virtual Machine - CPU (Reservations, Shares & Limits) Part 1(viii)

06:38 0
Virtual Machine - CPU (Reservations, Shares & Limits) Part 1(viii)
As I said, we"ll be covering the CPU - Reservation, Shares & Limits.

The SI Unit for CPU is hertz(Hz), frequency or clock cycles per second that were somewhat limited to the first generation CPUs. Now in the 21st Century, CPU's have larger processing capability with more clock cycles per second thereby measured in MHz(MegaHertz) i.e one million cycles per second & GHz(GigaHertz) i.e one billion cycles per second.

RESERVATION: Guaranteed minimum allocation of Resources.

LIMIT: Upper bound of given resource or the maximum amount of resource CONSUMER is entitled from physical(ESXi). 

SHARESPriority of a VM's access to a given resource.


In Case of CPU, Share values can be defined as Low, Normal, High & Custom.

In the 2 VMs named, CPU1(Girish01-2), CPU2(Girish01-3). I am running a script to increase the CPU activity.
In other 3 VMs named VM01(Low), VM02(Normal) & VM03(High) running normally with different share values.
                           


People are use to ask is there a performance impact on the VMs!! Nah!. There will be NO IMPACT till the time every one is not hungry for resource as soon as every one is hungry for the resource, there you go!!

As given in the screenshot with the help of CPU shares, the VM01 with high is getting more priority and henceforth.




Reference:Click here.





Thursday, 10 August 2017

Installing PowerCLI Version 10

06:17 0
Installing PowerCLI Version 10
Check the version of PowerShell in windows System,
In order to install powercli 6.5.2 ,  the version of PowerShell should be 5 or above.
To install PowerShell 5 for windows server 2012, click here.
Download it,  install and update the windows server.
Once done run this command to check the PowerShell version


  • $psversiontable




Once PowerShell version is updated, run these commands
  • Find-module -Name VMware.PowerCLI
  • Install-Module -Name VMware.PowerCLI -Scope CurrentUser


Once finished, you will be able to run powercli commands from the same window.





Tuesday, 8 August 2017

Virtual Machine - Edit Settings (Memory) Part 2 (i)

03:36 0
Virtual Machine - Edit Settings (Memory) Part 2 (i)
In my previous Series of posts, we have explored options available under CPU(Part1 to Part7).
In this series, we are going to talk about Memory options as below:-

As said for CPU & Memory Reservations, Shares & Limits,  I"ll be running a separate post after completing all the options related to virtual machine edit settings.

Here, In this post, the option to explore is Memory Hot Plug.

It can not be enabled when the machine is in running state and as told in case of CPU Hot Add posts earlier, it has to be supported by the operating system as in these given KB2020993 & KB2051989 articles.

Using this option, Memory Hot Plug: Memory can only be increased, it can not be decreased.
Given below is the screenshot of Windows Server 2012, Standard Edition that supports increasing the memory on the fly.


Before:                                 After:
     


Friday, 4 August 2017

Virtual Machine - Edit Settings (CPU) Part 1 (vii)

04:59 0
Virtual Machine - Edit Settings (CPU) Part 1 (vii)
In my previous post, I have talked about scheduling affinity.
In this post Part 7, I am going to talk about CPU/MMU Virtualization.



In this screenshot as you can see, I have used vSphere Web Client, Right Click on virtual machine & edit settings.

11. CPU/MMU Virtualization:- By default, it is automatic. Here, we get three options in this drop-down i.e
i) Software CPU & MMU
ii) Hardware CPU, Software MMU
iii) Hardware CPU & MMU


Software CPU - Software Based CPU Virtualization
Hardware CPU - Hardware assisted CPU Virtualization
Hardware MMU(Memory Management Unit) & Software MMU (Memory Management Unit)

For better understanding refer to this article.






Wednesday, 2 August 2017

Virtual Machine - Edit Settings (CPU) Part 1 (iv)

11:21 0
Virtual Machine - Edit Settings (CPU) Part 1 (iv)
In my previous post, we have talked about Performance Counter.
In this post CPU Part 6, We are going to talk about Scheduling Affinity


In this screenshot as you can see, I have used vSphere Web Client, Right Click on virtual machine & edit settings.

10. Scheduling Affinity:-  By default, a virtual CPU is scheduled to run on a logical CPU. Using this feature one can restrict a VM to a dedicated LCPU. 
EX:- Lets say we have ESXi with 8LCPU numbered from 0 to 7.
If we are using Scheduling affinity then it can be specified as 1,2,3,4-6 either way means you can specify dedicated LCPU number or the range of LCPU that can be used.
USE CASE:- For CPU Intensive VM performance testing purpose to check whethere scheduling it to dedicated LCPU enhances its performance or to check VMs throughput and response time when pinning it down to LCPU.

Tuesday, 1 August 2017

Virtual Machine - Edit Settings (CPU) Part 1 (v)

07:45 0
Virtual Machine - Edit Settings (CPU) Part 1 (v)
In my previous post, we have talked about CPUID Mask.
In this post of CPU Part 5, We are going to talk about Performance Counter



In this screenshot as you can see, I have used vSphere Web Client, Right Click on virtual machine & edit settings.

9. Enable Virtualized CPU performance counters: It is mainly used by developers for debugging software(software profilers) which is going to run in a VM such as vTune, OProfile, CodeAnalyst.
This feature is going to make some additional CPU related performance counters (MSRs-Model Specific Registers) available to the guest OS.

There is a KB2030221, which is related to what CPU Performance counters are exposed to guest OS.


Monday, 31 July 2017

Virtual Machine - Edit Settings (CPU) Part 4(iv)

08:49 0
Virtual Machine - Edit Settings (CPU) Part 4(iv)
In my previous post, we have talked about Enable CPU Hot Add.
I am going to skip Reservations, Limit & Shares which will be covered along with calculations in a later post.



In this screenshot as you can see, I have used vSphere Web Client, Right Click on virtual machine & edit settings.


7.CPUID Mask: By default, VM is set to expose the NX/XD flag to guest.


This feature helps prevent execution of certain type of code.
Ex: Here, I have Windows 7 32-bit installed in which I have Enabled/Disabled this feature.

Default, Expose NX/XD flag to guest.

Later on, I Hide the NX/XD flag from guest (64-bit Windows Server 2012) I get this error.

I tried it on Windows7-32 bit, it has a feature DEP (Data Execution Prevention)






Sunday, 30 July 2017

Virtual Machine - Edit Settings (CPU) Part 3 (iii)

01:46 0
Virtual Machine - Edit Settings (CPU) Part 3 (iii)
In my previous post, I have talked about CORE.
Now in this Part 3, We are going to talk about ENABLE CPU Hot Add.



In this screenshot as you can see, I have used vSphere Web Client, Right Click on virtual machine & edit settings.


3.ENABLE CPU Hot Add: This feature lets you add or remove CPU resource to a powered ON virtual machine.
It should be supported by the operating system and should be turned on in advance i.e If VM is running then this option is grayed out. In order to turn it, VM should be in POWERED OFF state.


 

This information is from Windows Server 2012 R2 Standard Edition.


Once CPU Hot Add is enabled: 



This information is from Windows Server 2012 R2 Standard Edition.
Now if you want to decrease the number of CPU, that can only be done if VM is powered OFF.

We are able to edit get this CPU option, I have installed Windows Server 2012 R2 Standard Edition. VMware has published these KB articles related to CPU Hot Add Feature: KB2020993, KB2051989 which relates to this feature for various operating systems.









Saturday, 29 July 2017

Virtual Machine - Edit Settings (CPU) Part 1 (ii)

01:23 0
Virtual Machine - Edit Settings (CPU) Part 1 (ii)
In my previous post, I have talked about CPU.
Now in this Part 2, We are going to talk about CORE.



In this screenshot as you can see, I have used vSphere Web Client, Right Click on virtual machine & edit settings.

CPU Settings:-
2.CORE: Here I have shared an example of single socket , quad core processor.
Initially when VMware released CORES PER SOCKET, it was there to deal with software licensing issue. So as to reduce number of licenses , which were based on SOCKETS.  Further, for performance it is beyond the scope of this blog post which includes: NUMA, vNUMA CPU technologies.


An interesting example is given on this KB:2078069

Virtual Machine - Edit Settings (CPU) Part 1 (i)

00:41 0
Virtual Machine - Edit Settings (CPU) Part 1 (i)
In order to learn more, one has to explore more.
In this series of blog post, i"ll be talking about all the options one have for a virtual machine.

This is Part 1 of virtual machines & I"ll be explaining and giving real time examples for all these options which are available for a virtual machine. In the end, we want our virtual machines to be running healthy. Hell Yeah!!


In this screenshot as you can see, I have used vSphere Web Client, Right Click on virtual machine & edit settings.

CPU Settings:-
1.CPU: It depends on your physical processor(Socket & Cores Per Socket) that are present on your server.
As you can see in my case, what my host(ESXi) has, I can that as LCPU to my VM.
If there is no hyperthreading than the total number of LCPU =8 & if it is enabled then the total number of LCPU=16. VCPU(Virtual CPU for VM) is scheduled on LCPU(Logical CPU, part of core).

So, In my case, the maximum number of vCPU that can be assigned to the VM =16.

Wednesday, 26 April 2017

Amazon AWS & Microsoft Azure Part 1. - Virtual Machines

23:52 0
Amazon AWS & Microsoft Azure Part 1. - Virtual Machines
I was very keen to learn about these two CLOUD giants namely Amazon's AWS & Microsoft's Azure.  So I started to explore about them that how are they similar and different from their offering perspective.

Both of them are Public Cloud offerings as most of the people are aware of it. So let's just start.
Azure has near to 68 offerings that one can choose from their big list whereas AWS has near to 100 offerings. Further, you can check their offerings on other blog posts. Like TOM's IT ProT has a very good comparison of it.

Starting with their Virtual Machine Related Services:-

AWS - EC2 ( Elastic Compute) & Azure Virtual Machines (Compute)

Here you can choose from a wide variety of Virtual machine instances that you can deploy and start using. So will start how to create a VM in EC2 and end with AWS Virtual machine.


Step1. Need to setup an account for AWS & Azure .

AWS has various type of Instances available, in layman's terms size of virtual machines. I"ll be using a Free Tier instance which will be T2.Micro
















Similar way how to create a EC2 instance, you can check on  Amazon tutorials as well.




Azure has different size of Virtual Machine available.












Monday, 24 April 2017

Installing PowerShell & PowerCLI in MAC OS

04:19 0
Installing PowerShell & PowerCLI in MAC OS
Mac Install 

Install These are the detailed instructions. 

Step 1 - Download PowerShell for MAC and need to check whether it allows you to install if gives you an error related to the unidentified application. To resolve this, click the Apple symbol in the menu bar and open System Preferences > Security & Privacy and then click Open Anyway.
Installed will be there and install.

Step 2 - Make sure you did not miss this step from the PowerShell installation instruction:

brew install openssl brew install curl --with-openssl 

Step 3 - Create the following directory if it does not exists by running the following command: 

mkdir -p ~/.local/share/powershell/Modules 

Step 4 - Extract the PowerCLI modules into the directory you created above by running the following command: 

unzip PowerCLI.ViCore.zip -d ~/.local/share/powershell/Modules 
unzip PowerCLI.Cis.zip -d ~/.local/share/powershell/Modules 
unzip PowerCLI.Vds.zip -d ~/.local/share/powershell/Modules



Monday, 17 April 2017

Renew the IP of VMkernel port if assigned from DHCP.

23:37 0
Renew the IP of VMkernel port if assigned from DHCP.
While working with one of vSAN HomeLab, i have assigned VMkernel port to get IP from DHCP and I should have assigned it on different subnet but did on the same subnet as of vMotion.
So, without removing and re-creating the vmkernel port i have came across this esxcli command:



esxcli network ip interface set -e false -i vmkN ; esxcli network ip interface set -e true -i vmkN

esxcli network ip interface ipv4 get



Friday, 7 April 2017

no element found line 1 column 0 in vSphere Replication

23:25 3
no element found line 1 column 0 in vSphere Replication
While working with SRM, I came across the problem with vSphere Replication that

no element found line 1 column 0 

in its VAMI console i.e https:\\vSphereReplicationIP:5480.

Its there because one vSphere Replication Appliance can only be registered with one vCenter Server and once it is done , if somehow there is error in the communication between vCenter & vSphere Replication Server you"ll end up getting this error.

How I resolved this.

1. Removed the solution user present in users and group for the designated vSphere Replication Appliance.
Solution User will be like : com.vmware.vr-UUID of vcenter Server.

2. Try and reinstall the certificates of vSphere Replication from VAMI console.

3. Now it should work.

Thursday, 30 March 2017

Alarm Override at Virtual Machine Workaround

04:18 0
Alarm Override at Virtual Machine Workaround
Just recently in a delivery of vSphere, a participant asked for this question:-

Could we override an alarm created at datacenter object on an individual virtual machine?

Directly it will not allow as you could check in the below given screenshot:




A workaround for this is to create two different folders: FOLDER 1 for which you want to EXCLUDE virtual machines and FOLDER 2 in which you want to include virtual machines.

Instead of creating an alarm at data center Object level. Create an alarm at the folder level.








When you set an alarm on a parent object, such as a vCenter Server, a data center, or a cluster, all applicable child objects inherit the alarm. You can also set an alarm on a folder to propagate the same alarm to all objects contained in that folder. You cannot change or override an alarm that is set on a child object from its parent object. You must change the alarm on the child object itself.