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What is the minimum number of nodes needed to deploy an RF3 NC2 cluster?
Replication Factor (RF3): RF3 requires that data is replicated across three different nodes to ensure data durability and fault tolerance. This replication scheme allows the system to tolerate the failure of two nodes simultaneously.
Minimum Node Requirement for RF3: To meet the RF3 requirements while maintaining operational capability, a minimum of five nodes is necessary. This configuration ensures that there are enough nodes to distribute the data and provide the necessary redundancy.
Nutanix Replication Factor Documentation
Nutanix NC2 on Azure Deployment Guide
Which console must be used to deploy a Nutanix cluster on Azure?
NC2 Console: The NC2 console is specifically designed for deploying and managing Nutanix clusters on Azure. It provides the necessary tools and interface to configure, monitor, and manage the NC2 clusters effectively.
Cluster Deployment: Using the NC2 console ensures that all configurations and integrations with Azure are correctly handled, providing a seamless deployment experience.
Nutanix NC2 Deployment Guide
Nutanix Console Documentation
What action is performed in Azure when an instance is reported as being in a terminated state, but NC2 expects it to be in a running state?
Instance Termination Detection: When an instance in Azure is reported as being in a terminated state but NC2 expects it to be running, the system will automatically take corrective actions.
Host Condemnation and Replacement: NC2 will condemn the host, marking it as unusable, and will then trigger the replacement process to ensure that the cluster maintains its required capacity and performance levels. This automatic handling ensures minimal disruption to the workloads running on the cluster.
Nutanix NC2 Automated Management Features
Azure Instance State Documentation
The cluster has the following configuration:
A Transit VPC exists as Default, but is additionally configured with a overlay-external-subnet-nonat overlay subnet
The ERP for the Transit VPC is 10.1.1.0/25
A User VPC exists named User_VPC_Prod
The ERP for the User VPC is 10.1.1.0/24
Outbound and inbound routes have been configured
A User VM NO-NAT subnet has been configured in the User VPC
The administrator has successfully created a VM and added the NIC associated with the NO-NAT subnet, but is not able to communication with other resources.
Which option will resolve this issue?
In this scenario, the issue arises from overlapping IP address ranges between the Transit VPC and the User VPC. Here's a detailed breakdown:
Understanding ERPs (Elastic Routing Prefixes):
The ERP for the Transit VPC is 10.1.1.0/25, which covers IP addresses from 10.1.1.0 to 10.1.1.127.
The ERP for the User VPC is 10.1.1.0/24, which covers IP addresses from 10.1.1.0 to 10.1.1.255.
IP Address Overlap:
Since 10.1.1.0/25 is a subset of 10.1.1.0/24, there is a significant overlap in the IP address ranges of these two ERPs.
This overlap can cause routing issues because the same IP address range is being used in both VPCs, leading to ambiguity in routing and communication.
Communication Issue:
When a VM in the User VPC tries to communicate with other resources, the network cannot accurately determine the correct route due to the overlapping IP address ranges.
This overlap prevents proper routing and results in the VM being unable to communicate with other resources as intended.
Resolution:
To resolve this issue, the ERPs must be in different CIDR ranges. This means the IP address ranges for the Transit VPC and the User VPC should not overlap.
For example, if the Transit VPC uses 10.1.1.0/25, the User VPC could use a different range such as 10.1.2.0/24 or any other range that does not overlap with 10.1.1.0/25.
By ensuring that the ERPs are in different CIDR ranges, the network can properly route traffic between the VPCs without any conflicts or ambiguities, thereby enabling the VM in the User VPC to communicate with other resources effectively.
Exhibit
An NC2 on Azure cluster was deployed with two Flow Gateway in HA (FHW1 and FGW2). After a week of use, four bare-metal nodes were added to the NC2 cluster and additional workloads were added. The existing workloads were using floating IPs to allow inbound traffic to communicate with the running workloads on the NC2 cluster.
It was determined that additional bandwidth for north/south traffic would be needed. Two additional Flow Gateways were added (FGW3 and FGW4) from the NC2 portal configuration menu.
The existing workloads prior to expansion on the NC2 cluster will be able to use which Flow Gateways using the NAT traffic path after the expansion?
In the NC2 on Azure cluster scenario, the existing workloads were using floating IPs for inbound traffic before the addition of new Flow Gateways (FGW3 and FGW4). The NAT traffic path established initially will continue to direct traffic through the originally assigned Flow Gateways (FGW1 and FGW2). The existing workloads will not automatically utilize the new Flow Gateways (FGW3 and FGW4) without a reconfiguration or reboot, which reassigns the NAT paths.
Reference
Nutanix Flow Networking and Configuration Guide
