Let’s create a conditional resource in Terraform based on a mapped key. Following post used for reference:
https://medium.com/@business_99069/terraform-conditional-resources-based-on-a-map-key-a37fd329d3a1
Start with a map data structure in our variable.tfvars:
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docker_swarm = { az-ds-man-tst1 = { ip_address = "172.19.100.82" environment = "test" application = "docker" docker_role = "swarm-manager" vm_size = "Standard_B2s" storage_account_type = "Standard_LRS" os_disk_storage_account_type = "Standard_LRS" }, az-ds-man-tst2 = { ip_address = "172.19.100.83" environment = "test" application = "docker" docker_role = "swarm-manager" vm_size = "Standard_B2s" storage_account_type = "Standard_LRS" os_disk_storage_account_type = "Standard_LRS" }, az-ds-man-tst3 = { ip_address = "172.19.100.84" environment = "test" application = "docker" docker_role = "swarm-manager" vm_size = "Standard_B2s" storage_account_type = "Standard_LRS" os_disk_storage_account_type = "Standard_LRS" }, az-ds-wrk-tst1 = { ip_address = "172.19.100.85" environment = "test" application = "docker" docker_role = "swarm-worker" vm_size = "Standard_A2_v2" storage_account_type = "StandardSSD_LRS" os_disk_storage_account_type = "Standard_LRS" }, az-ds-wrk-tst2 = { ip_address = "172.19.100.86" environment = "test" application = "docker" docker_role = "swarm-worker" vm_size = "Standard_A2_v2" storage_account_type = "StandardSSD_LRS" os_disk_storage_account_type = "Standard_LRS" } az-ds-wrk-tst3 = { ip_address = "172.19.100.87" environment = "test" application = "docker" docker_role = "swarm-worker" vm_size = "Standard_A2_v2" storage_account_type = "StandardSSD_LRS" os_disk_storage_account_type = "Standard_LRS" } az-ds-wrk-tst4 = { ip_address = "172.19.100.88" environment = "test" application = "docker" docker_role = "swarm-worker" vm_size = "Standard_A2_v2" storage_account_type = "StandardSSD_LRS" os_disk_storage_account_type = "Standard_LRS" } } |
Create a conditional azurerm_network_interface_backend_address_pool_assocation resource based on the value of the “docker_role” key in the above map. The lookup used in the logic below will only return true if the value is “swam-worker”. This resource block can be placed in any terraform file within the project.
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resource "azurerm_network_interface_backend_address_pool_association" "ds-swarm-workers" { for_each = { for k in keys(var.docker_swarm) : //loop over each object in docker_swarm map k => var.docker_swarm[k] //assign value of k to docker_swarm object with key value if lookup(var.docker_swarm[k], "docker_role", "swarm-worker") == "swarm-worker" //if docker_role attirbute is set to swarm worker, return true } network_interface_id = azurerm_network_interface.dswarm[each.key].id ip_configuration_name = "internal" backend_address_pool_id = azurerm_lb_backend_address_pool.ds-swarm-workers.id } |