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Monitor and scale an Azure Database for MySQL - Flexible Server instance using Azure CLI

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This sample CLI script scales compute, storage and IOPS for a single Azure Database for MySQL - Flexible server after querying the corresponding metrics. Compute and IOPS can be scaled up or down, while storage can only be scaled up.

If you don't have an Azure subscription, create an Azure free account before you begin. Currently, with an Azure free account, you can try Azure Database for MySQL - Flexible Server free for 12 months. For more information, see Use an Azure free account to try Azure Database for MySQL - Flexible Server for free.

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 subscriptionId with your Azure subscription ID.

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

subscription="subscriptionId" # Set Azure subscription ID 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 your MySQLFlexible Server and scale compute, storage, and IOPS

# Variable block
let "randomIdentifier=$RANDOM*$RANDOM"
subscriptionId="$(az account show --query id -o tsv)"
location="East US"
resourceGroup="msdocs-mysql-rg-$randomIdentifier"
tag="monitor-and-scale-mysql"
server="msdocs-mysql-server-$randomIdentifier"
login="azureuser"
password="Pa$$w0rD-$randomIdentifier"
ipAddress="None"
# Specifying an IP address of 0.0.0.0 allows public access from any resources
# deployed within Azure to access your server. Setting it to "None" sets the server 
# in public access mode but does not create a firewall rule.
# For your public IP address, https://whatismyipaddress.com

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 MySQL Flexible server in the resource group
echo "Creating $server"
az mysql flexible-server create --name $server --resource-group $resourceGroup --location "$location" --admin-user $login --admin-password $password --public-access $ipAddress

# Optional: Add firewall rule to connect from all Azure services
# To limit to a specific IP address or address range, change start-ip-address and end-ip-address
echo "Adding firewall for IP address range"
az mysql flexible-server firewall-rule create --name $server --resource-group $resourceGroup --rule-name AllowAzureIPs --start-ip-address 0.0.0.0 --end-ip-address 0.0.0.0

# Monitor CPU percent, storage usage and IO percent

# Monitor CPU Usage metric
echo "Monitor CPU usage"
az monitor metrics list \
    --resource "/subscriptions/$subscriptionId/resourceGroups/$resourceGroup/providers/Microsoft.DBforMySQL/flexibleservers/$server" \
    --metric cpu_percent \
    --interval PT1M

# Monitor Storage usage metric
echo "Monitor storage usage"
az monitor metrics list \
    --resource "/subscriptions/$subscriptionId/resourceGroups/$resourceGroup/providers/Microsoft.DBforMySQL/flexibleservers/$server" \
    --metric storage_used \
    --interval PT1M

# Monitor IO Percent
echo "Monitor I/O percent"
az monitor metrics list \
    --resource "/subscriptions/$subscriptionId/resourceGroups/$resourceGroup/providers/Microsoft.DBforMySQL/flexibleservers/$server" \
    --metric io_consumption_percent \
    --interval PT1M

# Scale up the server by provisionining to higher tier from Burstable to General purpose 4vcore
echo "Scale up to Standard_D4ds_v4"
az mysql flexible-server update \
    --resource-group $resourceGroup \
    --name $server \
    --sku-name Standard_D4ds_v4 \
    --tier GeneralPurpose 

# Scale down to by provisioning to General purpose 2vcore within the same tier
echo "Scale down to Standard_D2ds_v4"
az mysql flexible-server update \
    --resource-group $resourceGroup \
    --name $server \
    --sku-name Standard_D2ds_v4

# Scale up the server to provision a storage size of 64GB. Note storage size cannot be reduced.
echo "Scale up storage to 64 GB"
az mysql flexible-server update \
    --resource-group $resourceGroup \
    --name $server \
    --storage-size 64

# Scale IOPS
echo "Scale IOPS to 550"
az mysql flexible-server update \
    --resource-group $resourceGroup \
    --name $server \
    --iops 550

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 mysql flexible-server create Creates a Flexible Server that hosts the databases.
az monitor metrics list Lists the Azure Monitor metric value for the resources.
az mysql flexible-server update Updates properties of the Flexible Server.
az mysql flexible-server delete Deletes a Flexible Server.
az group delete Deletes a resource group including all nested resources.

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