Rico Troubleshooting Encounter: virtual

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Configure proxy on Nutanix CE

In the standard Nutanix "Command Reference NOX v4.1" Guide, there is a section "Create a new HTTP Proxy".

The general form is (where the square brackets only designate the non-required parameters):

ncli http-proxy add name="proxy_name" address="proxy_address" port="proxy_port" [ username="proxy_username" ] [ password="proxy_password" ]

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I setup nutanix community edition today in my homelab, and I was interested in looking at how to change both CVM vCPU and vRAM count. By default my CVM was running 4vcpu and 12GB of RAM, and I wanted to change this to 8vcpu and 15GB RAM (my CE whitebox is running a 8 core Atom CPU and 16GB RAM)
KVM is very new to me, so for my own documentation sake here are the steps I used.
SSH onto the KVM hypervisor using your favorite SSH client, in my case KVM was running on IP address 192.168.55.4, whilst the CVM was using 192.168.55.3
Logon using default nutanix KVM credentials of
Username: root
Password: nutanix/4u
First run virsh list to get the name of your Nutanix CVM, in my case it is NTNX-72c234e3-A-CVM

Next, run virsh dominfo NTNX-72c243e3-A-CVM to confirm number of CPU’s and RAM
To change the amount of RAM, in my case I increased from 12GB to 15GB, run the following commands and substitute the approriate CVM name
#Shutdown CVM
virsh shutdown NTNX-72c243e3-A-CVM
#Set vRAM (There should be two – -dashes before config)
virsh setmaxmem NTNX-72c243e3-A-CVM 15G – -config
virsh setmem NTNX-72c243e3-A-CVM 15G – -config
#start VM again
virsh start NTNX-72c243e3-A-CVM
To change the amount of CPU’s, edit the virsh XML file.
#edit virsh xml
virsh edit NTNX-72c243e3-A-CVM

This will open the VM XML file using vi editor, use the following commands to edit the file (I always forget how to edit in vi, so I will show the steps here for my own sake)

Press “i” to enter insert mode
Use the arrow keys to move to the following line 4
Change the 4 to whatever you want, in my case I did 8
Press “esc” to exit insert mode
Type “:wq” to write out and save the file

#Shutdown the Nutanix CVM
virsh shutdown NTNX-72c243e3-A-CVM
#Start the Nutanix CVM again
virsh start NTNX-72c243e3-A-CVM
Run virsh dominfo again to confirm the changes were successful
virsh dominfo NTNX-72c243e3-A-CVM

In most cases with Nutanix CE, the defaults are 99% OK for most people. So test to see if it’s really required to increase or decrease CVM resources according to required workload and hardware specifications. In my case I saw no difference so I set the defaults back

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Nutanix Nested Setup Guide

HowTo : Install VMware Tools on CentOS/RHEL

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VMware Tools is a suite of utilities that enhances the performance of the virtual machine's guest operating system and improves management of the virtual machine.
Without VMware Tools installed in your guest operating system, guest performance lacks important functionality.

Installing VMware Tools

Open Vmware Worstation or ESX console and Locate the VM you need to install VMware Tools to.
Right click the VM and choose "Tools", then select "Install VMware Tools".
It will connect the virtual CD-ROM device to the appropriate CD image containing the tools for your virtual machine.
Log into VMware Guest you need to install VMware Tools to.

Install the kernel-devel, gcc, dracut, make and perl packages using yum :
$ yum -y install kernel-devel gcc dracut make perl

Mount CD image with VMware Tools :
$ mkdir /mnt/cdrom
$ mount /dev/cdrom /mnt/cdrom

Copy the archive with VMware Tools to temporary directory :
$ cp /mnt/cdrom/VMwareTools-*.tar.gz /tmp

Uncompress the archive and run the installer :
$ tar -zxf /tmp/VMwareTools-*.tar.gz -C /tmp
$ /tmp/vmware-tools-distrib/vmware-install.pl --default

Remove temporary files :
$ rm -f /tmp/VMwareTools-*.tar.gz
$ rm -rf /tmp/vmware-tools-distrib

Validating VMware Tools Installation

Use the command as follows to validate that VMware Tools is running :
$ initctl list | grep vmware-tools
vmware-tools start/running

To determine the vmware-tools version, run the command :
$ vmware-toolbox-cmd -v

Error adding datastores to VMWARE ESXi

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Error Message:
I was unable to add any of the local disks to my VMWARE ESXi host as VMFS datastores as I got the error “HostDatastoreSystem.QueryVmfsDatastoreCreateOptions” for object ‘ha-datastoresystem’ on ESXi….” as shown below;

Solution:
There are various useful suggestions in the Eversity comments for dealing with GPT partitions but they are quite long winded. The quickest solution (as suggested by fdisk) was to use partedUtil.
You need to run the following command for each disk that you’re having issues with (this overwrites the partition table with a standard msdos one which VMware can work with);
NOTE: This will ERASE ALL DATA on the disk in question so be careful to select the right disks!

#partedUtil mklabel /dev/disks/ msdos

To get the disk id:
ls /dev/disks/

Remote Access to ESXi Shell Using SSH

Remote Access to ESXi Shell Using SSH

If Secure Shell is enabled for the ESXi Shell, you can run shell commands by using a Secure Shell client such as SSH or PuTTY.

Enabling SSH for the ESXi Shell

By default, you cannot access the ESXi Shell using a Secure Shell client. You can enable SSH access from the direct console.

To enable SSH access in the direct console

1	At the direct console of the ESXi host, press F2 and provide credentials when prompted.

2	Scroll to Troubleshooting Options, and press Enter.

3	Select Enable SSH and press Enter once.

On the left, Enable SSH changes to Disable SSH. On the right, SSH is Disabled changes to SSH is Enabled.

4	Press Esc until you return to the main direct console screen.

You can enable remote command execution from the vSphere Client.

To enable SSH from the vSphere Client

1	Select the host and click the Configuration tab.

2	Click Security Profile in the Software panel.

3	In the Services section, click Properties.

4	Select SSH and click Options.

5	Change the SSH options.

■	To temporarily start or stop the service, click the Start or Stop button.

■	To enable SSH permanently, click Start and stop with host. The change takes effect the next time you reboot the host.

Click OK.

After you have enabled SSH, you can use an SSH client to log in to the ESXi Shell and run ESXi Shell commands.

Accessing the ESXi Shell with SSH

If SSH is enabled on your ESXi host, you can use an SSH client to run commands on that shell.

To access the ESXi Shell with SSH

1	Open an SSH client.

2	Specify the IP address or domain name of the ESXi host.

Precise directions vary depending on the SSH client you use. See vendor documentation and support.

3	Provide credentials when prompted.

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