Add regions, change failover priority, trigger failover for an Azure Cosmos DB account using Azure CLI

  • Article

APPLIES TO: NoSQL MongoDB Cassandra Gremlin Table

The script in this article demonstrates three operations.

  • Add a region to an existing Azure Cosmos DB account.
  • Change regional failover priority (applies to accounts using service-managed failover)
  • Trigger a manual failover from primary to secondary regions (applies to accounts with manual failover)

This script uses a API for NoSQL account, but these operations are identical across all database APIs in Azure Cosmos DB.

Important

Add and remove region operations on an Azure Cosmos DB account cannot be done while changing other properties.

If you don't have an Azure trail subscription, create a trial subscription before you begin.

Prerequisites

You can use the local Azure CLI.

  • This article requires version 2.9.1 or later of the Azure CLI.

    Note

    Before you can use Azure CLI in Microsoft Azure operated by 21Vianet, please run az cloud set -n AzureChinaCloud first to change the cloud environment. If you want to switch back to Azure Public Cloud, run az cloud set -n AzureCloud again.

Sample script

Sign in to Azure

Use the following script to sign in using a different subscription, replacing <Subscription ID> with your Azure Subscription ID. If you don't have an Azure trail subscription, create a trial subscription before you begin.

az cloud set -n AzureChinaCloud
az login

subscription="<subscriptionId>" # add subscription here

az account set -s $subscription # ...or use 'az login'

For more information, see set active subscription or log in.

Run the script

# Region replica operations for an Azure Cosmos account

# Note: Azure Comos accounts cannot include updates to regions with changes to other properties in the same operation

Variable block
let "randomIdentifier=$RANDOM*$RANDOM"
location="chinaeast2"
failoverLocation1="chinanorth2"
failoverLocation2="chinanorth3"
resourceGroup="msdocs-cosmosdb-rg-$randomIdentifier"
tag="regions-cosmosdb"
account="msdocs-account-cosmos-$randomIdentifier" #needs to be lower case

# Create a resource group
echo "Creating $resourceGroup in $location..."
az group create --name $resourceGroup --location "$location" --tags $tag

# Create a Cosmos DB account with default values
# Use appropriate values for --kind or --capabilities for other APIs
echo "Creating $account for CosmosDB"
az cosmosdb create --name $account --resource-group $resourceGroup

# Specify region failover locations and priorities
echo "Adding $failoverLocation1 and $failoverLocation2"
az cosmosdb update --name $account --resource-group $resourceGroup --locations regionName="$location" failoverPriority=0 isZoneRedundant=False --locations regionName="$failoverLocation1" failoverPriority=1 isZoneRedundant=False --locations regionName="$failoverLocation2" failoverPriority=2 isZoneRedundant=False

# Make failoverLocation2 the next region to fail over to instead of failoverLocation1 
echo "Switching failover priority"
az cosmosdb failover-priority-change --name $account --resource-group $resourceGroup --failover-policies "$location=0" "$failoverLocation1=2" "$failoverLocation2=1"

# Initiate a manual failover and promote failoverLocation1 as primary write region
echo "Failing over to $failoverLocation1"
az cosmosdb failover-priority-change --name $account --resource-group $resourceGroup --failover-policies "$location=2" "$failoverLocation1=0" "$failoverLocation2=1"

Clean up resources

Use the following command to remove the resource group and all resources associated with it using the az group delete command - unless you have an ongoing need for these resources. Some of these resources may take a while to create, as well as to delete.

az group delete --name $resourceGroup

Sample reference

This script uses the following commands. Each command in the table links to command specific documentation.

Command Notes
az group create Creates a resource group in which all resources are stored.
az cosmosdb create Creates an Azure Cosmos DB account.
az cosmosdb update Updates an Azure Cosmos DB account (add or remove region).
az cosmosdb failover-priority-change Update failover priority or trigger failover on an Azure Cosmos DB account.
az group delete Deletes a resource group including all nested resources.

Next steps

For more information on the Azure Cosmos DB CLI, see Azure Cosmos DB CLI documentation.

For Azure CLI samples for specific APIs see: