availabilty zones

Azure Database for MySQL Flexible Server allows configuring high availability with automatic failover. With Zone-redundant HA your service has redundancy of infrastructure across multiple availability zones. Zone-redundant HA is preferred when you want to achieve the highest level of availability against any infrastructure failure in the availability zone and when latency across the availability zone is acceptable.

Azure Cache for Redis supports zone redundancy in its Premium and Enterprise tiers. A zone-redundant cache runs on VMs spread across multiple Availability Zones. It provides higher resilience and availability. Today I’ll show hot to test the failover of a zone-redundant cache. Deploy Azure Cache for Redis with availability zones # Create a main.tf file with the following content: # terraform { required_version = "> 0.14" required_providers { azurerm = { version = "= 2.57.0" } random = { version = "= 3.1.0" } } } provider "azurerm" { features {} } # Location of the services variable "location" { default = "west europe" } # Resource Group Name variable "resource_group" { default = "redis-failover" } # Name of the Redis cluster variable "redis_name" { default = "redis-failover" } resource "random_id" "random" { byte_length = 8 } resource "azurerm_resource_group" "rg" { name = var.resource_group location = var.location } resource "azurerm_redis_cache" "redis" { name = "${var.redis_name}-${lower(random_id.random.hex)}" location = azurerm_resource_group.rg.location resource_group_name = azurerm_resource_group.rg.name capacity = 2 family = "P" sku_name = "Premium" enable_non_ssl_port = true minimum_tls_version = "1.2" redis_configuration { } zones = ["1", "2"] } resource "azurerm_log_analytics_workspace" "logs" { name = "redis-logs" location = azurerm_resource_group.rg.location resource_group_name = azurerm_resource_group.rg.name sku = "PerGB2018" retention_in_days = 30 } resource "azurerm_monitor_diagnostic_setting" "monitor" { name = lower("extaudit-${var.redis_name}-diag") target_resource_id = azurerm_redis_cache.redis.id log_analytics_workspace_id = azurerm_log_analytics_workspace.logs.id metric { category = "AllMetrics" retention_policy { enabled = false } } log { category = "ConnectedClientList" enabled = false retention_policy { days = 0 enabled = false } } lifecycle { ignore_changes = [metric] } } output "redis_name" { value = azurerm_redis_cache.redis.name } output "redis_host_name" { value = azurerm_redis_cache.redis.hostname } output "redis_primary_access_key" { value = azurerm_redis_cache.redis.primary_access_key sensitive = true } Note: the zones are specified: zones = ["1", "2"], making the cache zone-redundant.