Configure zone-redundant high availability in an Azure Database for MySQL - Flexible Server instance using Azure CLI
This sample CLI script configures and manages High availability concepts in Azure Database for MySQL - Flexible Server in an Azure Database for MySQL - Flexible Server. You can enable Zone-Redundant high availability only during Flexible Server creation, and can disable it anytime. You can also choose the availability zone for the primary and the standby replica.
Currently, Zone-Redundant high availability is supported only for the General purpose and Business Critical pricing tiers.
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
Use the Bash environment in Azure Cloud Shell. For more information, see Quickstart for Bash in Azure Cloud Shell.
If you prefer to run CLI reference commands locally, install the Azure CLI. If you're running on Windows or macOS, consider running Azure CLI in a Docker container. For more information, see How to run the Azure CLI in a Docker container.
If you're using a local installation, sign in to the Azure CLI by using the az login command. To finish the authentication process, follow the steps displayed in your terminal. For other sign-in options, see Sign in with the Azure CLI.
When you're prompted, install the Azure CLI extension on first use. For more information about extensions, see Use extensions with the Azure CLI.
Run az version to find the version and dependent libraries that are installed. To upgrade to the latest version, run az upgrade.
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 $subscription # ...or use 'az login'
For more information, see set active subscription or log in interactively.
Run the script
# Configure zone-redundant high availability
# Variable block
let "randomIdentifier=$RANDOM*$RANDOM"
location="East US"
resourceGroup="msdocs-mysql-rg-$randomIdentifier"
tag="zone-redundant-ha-mysql"
server="msdocs-mysql-server-$randomIdentifier"
sku="Standard_D2ds_v4"
tier="GeneralPurpose"
login="azureuser"
password="Pa$$w0rD-$randomIdentifier"
ipAddress="None"
primaryZone="1"
standbyZone="2"
# 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
# Enable Zone-redundant HA while creating a MySQL Flexible server in the resource group
# HA is not available for burstable tier
# Zone and standby-zone parameters are optional
# HA cannot be enabled post create
echo "Creating $server"
az mysql flexible-server create --name $server --resource-group $resourceGroup --location "$location" --sku-name $sku --tier $tier --admin-user $login --admin-password $password --public-access $ipAddress --high-availability ZoneRedundant --zone $primaryZone --standby-zone $standbyZone
# 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
# Disable Zone-redundant HA
echo "Disabling zone redundant HA"
az mysql flexible-server update --resource-group $resourceGroup --name $server --high-availability Disabled
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 mysql flexible-server update | Updates a Flexible Server. |
| az mysql flexible-server delete | Deletes a Flexible Server. |
| az group delete | Deletes a resource group including all nested resources. |