Monitor and scale a single PostgreSQL server using Azure CLI

APPLIES TO: Azure Database for PostgreSQL - Single Server Azure Database for PostgreSQL - Flexible Server

This sample CLI script scales compute and storage for a single Azure Database for PostgreSQL server after querying the metrics. Compute can scale up or down. Storage can only scale up.

Important

Storage can only be scaled up, not down.

If you don't have an Azure subscription, create an Azure free account before you begin.

Prerequisites

Sample script

Launch Azure Cloud Shell

The Azure Cloud Shell is a free interactive shell that you can use to run the steps in this article. It has common Azure tools preinstalled and configured to use with your account.

To open the Cloud Shell, just select Try it from the upper right corner of a code block. You can also launch Cloud Shell in a separate browser tab by going to https://shell.azure.com.

When Cloud Shell opens, verify that Bash is selected for your environment. Subsequent sessions will use Azure CLI in a Bash environment, Select Copy to copy the blocks of code, paste it into the Cloud Shell, and press Enter to run it.

Sign in to Azure

Cloud Shell is automatically authenticated under the initial account signed-in with. 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 subscription, create an Azure free account before you begin.

subscription="<subscriptionId>" # add subscription here

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

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

Run the script

# Monitor and scale a single PostgreSQL server

# Variable block
let "randomIdentifier=$RANDOM*$RANDOM"
subscriptionId="$(az account show --query id -o tsv)"
location="East US"
resourceGroup="msdocs-postgresql-rg-$randomIdentifier"
tag="scale-postgresql-server"
server="msdocs-postgresql-server-$randomIdentifier"
sku="GP_Gen5_2"
login="azureuser"
password="Pa$$w0rD-$randomIdentifier"
scaleUpSku="GP_Gen5_4"
scaleDownSku="GP_Gen5_2"
storageSize="102400"

echo "Using resource group $resourceGroup with login: $login, password: $password..."

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

# Create a PostgreSQL server in the resource group
# Name of a server maps to DNS name and is thus required to be globally unique in Azure.
echo "Creating $server in $location..."
az postgres server create --name $server --resource-group $resourceGroup --location "$location" --admin-user $login --admin-password $password --sku-name $sku

# Monitor usage metrics - CPU
echo "Returning the CPU usage metrics for $server"
az monitor metrics list --resource "/subscriptions/$subscriptionId/resourceGroups/$resourceGroup/providers/Microsoft.DBforPostgresql/servers/$server" --metric cpu_percent --interval PT1M

# Monitor usage metrics - Storage
echo "Returning the storage usage metrics for $server"
az monitor metrics list --resource "/subscriptions/$subscriptionId/resourceGroups/$resourceGroup/providers/Microsoft.DBforPostgresql/servers/$server" --metric storage_used --interval PT1M

# Scale up the server by provisionining more vCores within the same tier
echo "Scaling up $server by changing the SKU to $scaleUpSku"
az postgres server update --resource-group $resourceGroup --name $server --sku-name $scaleUpSku

# Scale down the server by provisioning fewer vCores within the same tier
echo "Scaling down $server by changing the SKU to $scaleDownSku"
az postgres server update --resource-group $resourceGroup --name $server --sku-name $scaleDownSku

# Scale up the server to provision a storage size of 10GB
# Storage size cannot be reduced
echo "Scaling up the storage size for $server to $storageSize"
az postgres server update --resource-group $resourceGroup --name $server --storage-size $storageSize

Clean up deployment

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 commands outlined in the following table:

Command Notes
az group create Creates a resource group in which all resources are stored.
az postgres server create Creates a PostgreSQL server that hosts the databases.
az postgres server update Updates properties of the PostgreSQL server.
az monitor metrics list List the metric value for the resources.
az group delete Deletes a resource group including all nested resources.

Next steps