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A Brownfield Application is a type of application that allows you to import and manage existing VMs that were not deployed by Calm. You can use a Brownfield Application to perform actions such as start, stop, restart, delete, or execute scripts on the imported VMs. You can also add services, credentials, variables, and policies to the Brownfield Application blueprint. To create a Brownfield Application, you need to select a multi-VM blueprint and then choose the VMs that you want to include in the application from the drop down list. You can also filter the VMs by name, cluster, or power state.

A Greenfield Application is a type of application that allows you to deploy new VMs from scratch using Calm. You can use a Greenfield Application to provision and configure VMs on different cloud platforms, such as Nutanix AHV, VMware ESXi, AWS, Azure, or GCP. You can also add services, credentials, variables, and policies to the Greenfield Application blueprint. To create a Greenfield Application, you need to select a single-VM or a multi-VM blueprint and then specify the VM properties, such as name, image, flavor, network, storage, etc.

References:

• Nutanix Calm DSL – Brownfield Apps the Easy Way
• Nutanix Support & Insights
• Getting started with Nutanix Calm

Categories are a way of organizing and managing resources in Nutanix Calm. Categories can be used to define access policies, filter resources, and group applications. By assigning new VMs to a category, the administrator can grant access to the OS Team based on their Active Directory Group membership. The OS Team can then use the web SSH console to access the Linux VMs from the Calm UI.

References:

• Nutanix Support & Insights, section “Categories”
• Nutanix Support & Insights, section “Accessing the Web SSH Console”
• Nutanix Command Line Interface | Nutanix Community, section “SSH to any CVM as a nutanix user and type ncli and hit return to enter the ncli command shell and will be the same process for acli.”
• Nutanix Support & Insights, section “Customizing a Linux VM with Cloud-Init”

The error message “Authentication by failed” typically indicates an issue with the authentication credentials being used. Since the administrator is using SSH key-based credential to authenticate, it’s essential to ensure that the private key associated with this credential is correct and accessible. If there’s an issue with the private key, such as it being incorrect or inaccessible, authentication will fail. Increasing the retries or modifying the timeout will not help if the credential is invalid. Changing to password authentication credential may work, but it’s not the best option as it may compromise security and require additional configuration. References:

• Nutanix Certified Professional - Multicloud Automation (NCP-MCA) v6.5, Section 3 - Validate Blueprints, Runbooks, Playbooks, and Automation Settings, page 2
• Nutanix Multicloud Automation Administration (NMCAA), Module 5 - X-Play, Lesson 5.2 - Credential Management, page 7
• Nutanix Calm User Guide, Credential Management, SSH Key-Based Authentication

A Playbook action has a default memory limit of 256 MB, which can be increased up to 1024 MB in the advanced settings of the action. If the action requires more memory than the limit, it will fail with the error message “Internal Error, Maximum Memory size limit reached”. To resolve this issue, the administrator can edit the action and increase the memory limit to a suitable value, depending on the complexity and requirements of the action.

References:

• Nutanix Multicloud Automation Administration (NMCAA) Course, Module 3: X-Play, Lesson 3.3: Creating and Managing Playbooks, Slide 19: Action Settings
• Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide, Section 3: Validate Blueprints, Playbooks, and Automation Settings, Objective 3.3: Determine the correct method to validate required Playbook configurations