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3162 Topics
Albert Mendoza
Nutanix Employee
Albert MendozaNutanix Employee
posted in How It works
New KB Articles Published on Week Ending November 30, 2019

Below are new knowledge base articles published on the week of November 24-30, 2019. KB 8302 - Pre-Upgrade Check : test_is_hyperv_nos_upgrade_supported KB 8303 - Pre-Upgrade Check : test_if_cau_update_is_running KB 8499 - Security - Nutanix definitions for most common STIGs KB 8555 - Launching a blueprint by using the simple_launch API fails after Prism Central is upgraded to 5.11 KB 8616 - "Restore" screen under ASYNC DR is misaligned if entity have long name KB 8618 - PD: Trying to to 'deactivate-and-destroy-vms' operation got error 'Error: Unexpected application error kInvalidAction raised' KB 8619 - Genesis may not start with error 'Received multiple ips for interface bound to ExternalSwitch' KB 8621 - Alert - A400101 - NucalmServiceDown KB 8622 - Alert - A400102 - EpsilonServiceDown KB 8629 - Calm - Jenkins deployment is stuck at "Installing: ssh-credentials" and fails without error messages KB 8639 - AHV | Never-schedulable node CVMs are not shown in the VM in Prism. KB 8641 - De

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Albert Mendoza
Nutanix Employee
S
Sam41Adventurer
asked in How It works
How Nutanix works!

Hi all, I have some questions that I’m trying to answer but … ;) So if you can explain to me or point me to a part of some resources   # Questions Is it recommended or mandatory to configure containers as ReplicationFactor-3 when the cluster is RedundancyFactor-3 In case of ReplicationFactor-3, when reading, how many checks are done to validate data correctness? In a RedundancyFactor-2 only 1 failure is tolerated, the cluster will still work with (e.g) 2 Zookeeper. In RedundancyFactor-3 there is 5 Zookeeper, so why we can’t tolerate up to 3 failure? What are the limitations for which it is not possible to migrate VMs between containers without the export/import method? How the cluster will behave in case of network separation issue (e.g. 4 nodes can communicate and 4 other too)? If I a have 2 Guest VM in the same Vlan, will they communicate through the OVS br0 or the traffic will go till the external switch and come back to the cluster? With the bond0 (br0.up) interface having 2 links

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Alona
Nutanix Employee
R
roberthwlAdventurer
asked in How It works
Host services restart when network changes resulting in vm down

We have had a couple of instances recently when making network changes that have affected our clusters. This caused a restart on the lead host due to it detecting a network loss and  then resulted in system outages. The cluster is configured with dual networks ports in active and passive mode and the understanding was that it would switch if any change or failure was detecetd without producing error events and systems down.

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Nutanix Employee
F
frederic_esVoyager
asked in Installation & Configuration
Cerebro http on port 2020 and security

Hi all, A network security audit on a customer infrastructure reported a vulnerability on the cerebro http (port 2020) who is open on http in every CVM and without any security prompt.Some sensitives informations are visible : - AOS version : el7.3-release-euphrates-5.10.7-stable-... - VM Names  - Protection Domain names  - Witness ip address   - ...  Is there’s a way to secure this component ?

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C
cK_Voyager
asked in Installation & Configuration
Encrypt VM and Data-At-Rest using ESXi Nutanix

Hi, As per title i am wondering about encryption when we are using ESXi hosts and Nutanix together. We would like to encrypt the VM's and maybe Data-At-Rest encryption. We have currently 3 nodes in a block with 3 ESXi hosts and i wonder what the best practice is about encryption? Is it possible to encrypt the data both via Nutanix and vmwar software/KMS? Is it possible to encrypt only the VM's via VMware encpryption method and use the KMS directly via VMware or should i use the prism management? Does it matter in a Nutanix way if you choose to set up the KMS and encrypt the Data from the vSphere instead of doing it in the Prism mangement? Thank you in advance.

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Alona
Nutanix Employee
dlira
dliraTrailblazer
asked in How It works
Python - Inventory VM and Cluster Inventory Tools v1.3

Hi In my previous publication, publish version v1.2. (https://next.nutanix.com/scripts-32/nutanix-tools-for-ahv-v1-2-32075) It was updated to v1.3 and it already extracts new information. The status of the NGT TOOLS, description, etc. and many new key validators to avoid problems. Additional I add a small script to obtain the information of the connection of the cluster to the TOR switch and the physical ports. Please check the github for more information. https://github.com/dlira2/Nutanix-tools-for-AHV I use the script in large accounts with more than 1000VMs and it works optimally.

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Alona
Nutanix Employee
H
HongAdventurer
asked in How It works
VM capacity and prism capacity are different

Hi, I got a question during the test. Window VMs(C: drive) , linux VMs(df -h) capacity different those capacity in the prism(VM-table). Not all VMs are like this, only a few are like this. These VMs erased a lot of data and got a lot of capacity. The Curator has since been executed, but the capacity has not decreased inf prism-vm-table. Why can't Prism return a VM's erased data capacity value? How do I get Prism to read this capacity? Window -> Server 2016 Linux -> Centos 7.X Thank you.

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Alona
Nutanix Employee
omero.muscio
omero.muscioAdventurer
posted in Move Application Migration
How-to: Cancel stuck Tasks in Move

Hi This is my first blog entry and therefore I would like to introduce myself briefly. My name is Omero Muscio, I have been working at Amanox Solutions in Switzerland as Presales Engineer for a little more than half a year. This means that I mainly take care of the customers' technical concerns, create sizings, carry out PoCs and go to the customer to carry out post-sales activities. How-To Cancel Stuck Move Migration Plan: With Nutanix Move 3.3.1, we had the error twice at our customer's site that the migration plan did not fail after manual abort, but hung up. With the help of Nutanix Support, we were able to quickly find a solution to this problem. Log in to the AHV VM via SSH or in the console. Username: admin PW: nutanix/4u enter rs,this is similar to sudo or su From now on you are logged in as root@move. Now we connect to the Postgre database: postgres-shell to open the PG-Shell psql -d datamover to get into the corresponding PSQL shell With the help of the command select mpuui

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omero.muscio
Alona
Nutanix Employee
AlonaNutanix Employee
posted in Installation & Configuration
Foundation - how to image bare metal nodes

There is an ever-increasing chance that the next time you will need to add a node to the cluster or build a brand new cluster using new nodes – they will be bare metal nodes. What that means is that there is neither AHV nor CVM pre-installed on the node (unlike with factory imaged nodes). The process of imaging differs slightly from handling a factory imaged nodes hence this post. Bare metal nodes might come with a Discovery OS - small footprint software which allows for the node to be discovered by AOS 5.11 and later and thus imaged by an existing cluster CVM. When building a new cluster standalone (bare metal) imaging is performed from a workstation with access to the IPMI interfaces of the nodes in the cluster. Imaging a cluster in the field requires first installing certain tools on the workstation and then setting the environment to run those tools. This includes setting up Foundation VM and uploading Nutanix software images to the Foundation VM. Now follow the guide and let the i

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Alona
Nutanix Employee
S
Nutanix Employee
Sneha PatekarNutanix Employee
posted in How It works
Converting AHV to ESXI

Hi all, did you guys know that AHV to ESXi conversion is only possible from Prism (Convert cluster option) if the cluster was earlier Esxi converted to AHV and being converted back to ESXi.  AHV to ESXi conversion is not supported from the Prism. Some pre- requisites for converting AHV to ESXi via prism are-https://portal.nutanix.com/#/page/docs/details?targetId=Web-Console-Guide-Prism-v55:man-cluster-conversion-requirements-limitations-r.html#nref_amd_hlp_k5 However one could always re-image an AHV node to ESXi manually. Before converting the cluster, customer should always migrate the running vms on the AHV cluster to their DR cluster. This can be done using Protection Domains. More information on Protection Domains can be found below: https://portal.nutanix.com/#/page/docs/details?targetId=Prism-Element-Data-Protection-Guide-v511:Prism-Element-Data-Protection-Guide-v511  or also refer KB-3059 https://portal.nutanix.com/#/page/kbs/details?targetId=kA03200000098T7CAI Once cluster is c

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S
Nutanix Employee
J
JeruScout
asked in Installation & Configuration
Monitoring Nutanix with Nagios XI

Hi   I want to monitor our Nutanix environment by Nagios XI. Is there a neat guide on how to do this?   Thanks Jeru

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M
Nutanix Employee
S
Nutanix Employee
sbarabNutanix Employee
posted in How It works
Nutanix and Security

Nowadays everyone is concerned about the security of their infrastructure as they should be.  The Nutanix document referenced below contains an overview of the security development life cycle (SecDL) and host of security features supported by Nutanix. It also demonstrates how Nutanix complies with security regulations to streamline infrastructure security management. In addition to this, this guide addresses the technical requirements that are site specific or compliance-standards (that should be adhered), which are not enabled by default. https://portal.nutanix.com/#/page/docs/details?targetId=Nutanix-Security-Guide-v510:Nutanix-Security-Guide-v510    

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Nutanix Employee
F
FelixWVoyager
asked in Installation & Configuration
OptiPlex Micro Home lab

Hi there, i need some help with my Dell OptiPlex Micro Cluster. I wanted to build up a four node cluster but everytime i try to install the Nutanix CE, right at the finish line it says: “Waiting for the Nutanix Controller VM to start up………...…” followed by: “A Problem was encountered. Please review the contents of /home/install/firstboot.out for details, and refer to the documentation or the Nutanix NEXT community for next steps. Press <Enter> to return to the login prompt.” Now if i restart the installation and try to repair the CVM this error appears: “ FATAL: AN exception was raised: Traceback (most recent call last): File “./phoenix”, line 96, in <module> main() File “./phoenix”, line 74, in main params = gui.get_params(gui.CEBootDiskConfirm) File “./phoenix/gui.py”, line 1675, in get_params if guitype(args=args).skip_get_params:  File “./phoenix/gui.py”, line 687, in __init__ self.boot_disk = self.get_ce_boot_disk() File “./phoenix/gui.py”, line 772, in get_ce_boot_di

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S
Nutanix Employee
sbarabNutanix Employee
posted in How It works
Cluster upgrades when with metro availability is enabled

All clusters will need to be upgraded at a point. If you have metro availability enabled in your environment,  you will need to follow the best practices guide lines for it:   https://portal.nutanix.com/#/page/docs/details?targetId=Web-Console-Guide-Prism-v510:wc-metro-availability-upgrade-considerations-r.html   Specifically Nutanix supports the following replications: Between N to N-2 major versions and vice versa for STS to STS versions or LTS to STS versions. Between N to N-1 major versions and vice versa for LTS to LTS versions.

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S
Nutanix Employee
Alona
Nutanix Employee
AlonaNutanix Employee
posted in How It works
Pulse - what's in it for you? Much more than a simple call home.

 Nutanix Pulse HD provides diagnostic system data to Nutanix support teams to deliver pro-active, context-aware support for Nutanix solutions. The Nutanix cluster automatically and unobtrusively collects this information with no effect on system performance. Pulse HD shares only basic system-level information necessary for monitoring the health and status of a Nutanix cluster.   OK, this is all great but let’s get to real benefits, shall we? Q 1. Why would you enable it? A. Well, for several reasons: So that if you have an issue that you raise with Nutanix support we would be able to start looking at the data about your cluster immediately without making you answer many questions that are often crucially important for a prompt issue resolution. In essence, to reduce the amount of time it takes to fix the problem. So that when Nutanix engineer requires logs they would be able to collect them themselves while you would focus on what you need to do. No frustration with logs collection,

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Alona
Nutanix Employee
D
dhanshawVoyager
asked in Installation & Configuration
Portable Foundation - Windows 10

Sorry if this topic has already been covered. I have been trying to use the new "Portable Foundation" app that runs on windows to image a cluster without using a VM. Every time I try (three so far) I get errors that the IPs I have provided are already used. I am using a flat switch and the 10G and 1G are unplugged from the customers switches. I have tried with my laptop in and out of airplane mode, with the firewall on and off and still receive the errors. The only difference is that each time I try, the listed IP conflicts are never the same. It will tell me in the first try that x, y, and z are in use, then the second time it may say that a, b, and y are in use. Any ideas? I really like the idea of this app working. Thanks, -David

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S
Nutanix Employee
N
NandaAdventurer
asked in How It works
Nutanix Snapshots

Please Help: As per this video, when the new data is written to the cloned/snapshotted vDisk, what happens when we delete a snapshot? Say we created three snapshots and deleted a second snapshot which have new data written while the base vDisk was read only, what happens to the newly written data? Will it be committed to the base vDisk or the current state snapshot will be alive and other will be deleted? https://www.youtube.com/watch?v=uK5wWR44UYE

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S
Nutanix Employee
B
BrunoRScout
asked in How It works
Rest Api V3 - Get Host Usage Stats

Hi, I'm already consuming API V3.0 to retrieve data from Nutanix Element. But i',m not figure how can i get usage stats info (CPU, RAM, DISK) from hosts or VMs. There's a way to do that on V3 or i need to call v2 or v1?

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HITESH0801
Nutanix Employee
J
Jerel
asked in How It works
Discovery of Nutanix Appliance

Hello All, The infrastructure team within my organization has recently rolled out several Nutanix environments. Unfortunately we are only able to discover the individual VM's and not the actual appliances. When we tried to address this with the Infrastructure team it was stated that no SSH credentials can be provided as the only credential come from the vendor. Our Discovery tool only supports Nutanix discovery via SSH. Which leads me to my Question? Is anybody performing Discovery on Nutanix appliance and VM's using Discovery tools in there environment and if so how are you achieving this?

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Alona
Nutanix Employee
A
Nutanix Employee
AkshayPoddarNutanix Employee
asked in How It works
CVM Swap and Partitions details

CVM Swap and Partitions details. What are the partition used for metadeta.

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P
Nutanix Employee
M
mandgTrailblazer
asked in How It works
CVM's running NFS server risk

I just had a security scan done against my cluster running AOS 5.5.6 and the only 'high' risk that came back was with cve-id CVE-1999-0548 (NFS Server Without Shares Detected): Description; A superfluous NFS server that is not sharing any file systems has been detected. How to Fix; Disable the NFS server. Obliviously, I don't think I want to disable the NFS server service on all of my cvm's - is there any official documentation that I can share with my peers to support this so that I can get an exemption from this risk on these systems?

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danny_sre
Nutanix Employee
N
Nyth
asked in Installation & Configuration
Need help setting up Virtual Private Clouds

Hello, If I have 3 Nutanix nodes and I cluster them together. How can I make a separate VPC for a test stack and a separate VPC for a Production stack? So that way I can build my VM's on the test stack and once they are good to go...I can do the same steps on my Production stack. I would like to have 2 isolated stacks for testing and production. Is this possible? Thanks

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danny_sre
Nutanix Employee
S
solfoit1Voyager
asked in Installation & Configuration
VM with direct access to network adapter

For a customer i'm managing a AHV cluster. One of the virtual machines needs to have direct access to a network interface for monitoring traffic (port mirroring). Is this possible with the current releases of AHV? With kind regards, Ruud

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danny_sre
Nutanix Employee
P
pgaray05Wayfarer
asked in How It works
Question about sizing design

I'm adding workloads a new Scenario with Sizer Nutanix and I have a doubt about the sizing design because when I add a MV with 384 GB RAM the recomendation of Nodes are only 256 GB or 192 GB of RAM Memory. Could we explain why this. Regards

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P
Nutanix Employee
a.p.
a.p.Pathfinder
asked in Installation & Configuration
CVM network sementation and vSphere distributed switches

According to the documentation, Backplane traffic segmentation is not supported in a configuration for "ESXi clusters in which the CVM is connected to a VMware distributed virtual switch" . What I'd like to understand is whether this is related to technical reasons, or it is just a configuration limitation of the CVM installer/Prism management? So far I counldn't find a comprehensive guide/document about setting up a Nutanix cluster with vSphere distributed switches, and nodes with 2x10gbps each. It doesn't seem to make sense to me to set this up with standard swtches (i.e. no Network I/O control) where all traffic (VM, storage, vMotion, ...) use the same physical uplinks.

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HITESH0801
Nutanix Employee

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