nutanix‐database‐automation‐ncp‐db‐ncp‐db‐65‐exam‐questions_46 - itnett/FTD02H-N GitHub Wiki

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Cheat Sheets for Critical Commands and Configurations for NDB Exam Preparation

This cheat sheet provides a quick reference to the most important CLI commands and configurations required for deploying and managing Nutanix Database Service (NDB).


Section 1: NDB Instance Deployment Commands

Command Description and Usage Example
ndb-deploy --import <file> Deploys an NDB instance by importing the NDB QCOW2 or OVA file.
Example: ndb-deploy --import NDB.qcow2
ndb-deploy --network <settings> Configures network settings for the NDB instance.
Example: ndb-deploy --network IP=192.168.1.100
ndb-deploy --set-timezone <TZ> Sets the timezone for the NDB instance.
Example: ndb-deploy --set-timezone UTC
ndb-deploy --start Starts the NDB instance after deployment.
Example: ndb-deploy --start
ndb-cli cluster list Lists all available clusters to validate cluster setup.
Example: ndb-cli cluster list

Common Errors and Fixes:

  • Error: Invalid Network Configuration
    Fix: Ensure the correct subnet, gateway, and DNS settings are provided in the --network command.

Section 2: High Availability Configuration Commands

Command Description and Usage Example
ndb-ha enable Enables high availability for the NDB instance.
Example: ndb-ha enable
ndb-ha add-node --node <node-name> Adds a new node to the HA configuration.
Example: ndb-ha add-node --node NDB-Node2
ndb-ha set-primary --node <node-name> Sets a specific node as the primary HA node.
Example: ndb-ha set-primary --node NDB-Node1
ndb-ha monitor --check Checks the status of HA configuration and failover readiness.
Example: ndb-ha monitor --check
ndb-ha failover --manual --to-node <node-name> Manually triggers failover to a specified node.
Example: ndb-ha failover --manual --to-node NDB-Node2

Common Errors and Fixes:

  • Error: Node Not Available for HA
    Fix: Verify the node's health and connectivity status before adding it to HA.

Section 3: Alert and Notification Setup Commands

Command Description and Usage Example
ndb-alerts create --name <alert-name> Creates a new alert for a specific event.
Example: ndb-alerts create --name HighCPUUsage
ndb-alerts list Lists all existing alerts configured in the NDB.
Example: ndb-alerts list
ndb-alerts delete --name <alert-name> Deletes a specific alert.
Example: ndb-alerts delete --name HighCPUUsage
ndb-configure smtp --server <server> Configures SMTP server for alert notifications.
Example: ndb-configure smtp --server smtp.example.com --port 587 --tls
ndb-alerts notify --test Tests the alert notification system to ensure emails are being sent.
Example: ndb-alerts notify --test

Common Errors and Fixes:

  • Error: SMTP Connection Failed
    Fix: Verify SMTP server settings, credentials, and network connectivity.

Section 4: Database Patching and Upgrade Commands

Command Description and Usage Example
ndb-patch list --available Lists all available patches for the current database version.
Example: ndb-patch list --available
ndb-patch apply --name <patch-name> Applies a specific patch to a database instance.
Example: ndb-patch apply --name Patch_12.1
ndb-upgrade check --db <db-name> Checks the current database version and compatibility for upgrades.
Example: ndb-upgrade check --db OracleDB
ndb-upgrade perform --db <db-name> --version Upgrades a database instance to a specific version.
Example: ndb-upgrade perform --db OracleDB --version 19c
ndb-upgrade rollback --db <db-name> Rolls back a failed database upgrade to the previous version.
Example: ndb-upgrade rollback --db OracleDB

Common Errors and Fixes:

  • Error: Incompatible Database Version
    Fix: Review the compatibility matrix and ensure the target version is supported.

Highlight Boxes for Critical Commands

  • Red Box: Commands that trigger critical actions such as ndb-ha failover or ndb-upgrade rollback.
  • Green Box: Commands for routine checks and configurations like ndb-cli cluster list or ndb-alerts notify --test.

Visual Layout Tips:

  • Two-Column Layout: On the left, list the command; on the right, provide a description and usage example.
  • Use Color Coding: Highlight critical commands in red or green to signify importance.
  • Common Errors Box: At the bottom of each section, summarize common errors and their fixes to reinforce learning.

By using this cheat sheet, you can quickly access the most critical CLI commands and configurations necessary for managing an NDB environment effectively.

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