Variables
- Variables are value which can be manipulated with in the templated
- Variable syntax can be found here
Using Copy Effectively
- Starting from where we left in the last article. We have removed the count parameter & added a variable for network name.
- Used a function to populate the resource location
- With these changes, the script looks something like this
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion" : "1.0.0.0",
"parameters": {
"vnetaddresspace": {
"type": "array",
"defaultValue":["192.168.0.0/16"]
},
"subnetnames":{
"type": "array",
"defaultValue": ["web", "business","data"]
},
"subnetAddress":{
"type": "array",
"defaultValue": ["192.168.0.0/24","192.168.1.0/24", "192.168.2.0/24"]
}
},
"variables":{
"vnetname": "ntier"
},
"resources":[
{
"name": "[variables('vnetname')]",
"type": "Microsoft.Network/virtualNetworks",
"apiVersion": "2019-04-01",
"location": "[resourceGroup().location]",
"properties": {
"addressSpace": {
"addressPrefixes": "[parameters('vnetaddresspace')]"
}
}
},
{
"name": "[concat(variables('vnetname'),'/',parameters('subnetnames')[copyIndex()])]",
"type": "Microsoft.Network/virtualNetworks/subnets",
"apiVersion": "2019-04-01",
"properties": {
"addressPrefix": "[parameters('subnetAddress')[copyIndex()]]"
},
"dependsOn": ["[variables('vnetname')]"],
"copy": {
"name": "websitescopy",
"count": "[length(parameters('subnetnames'))]",
"mode": "serial"
}
}
]
}
- Lets add an simple output to the template. In this case i will be adding the count of subnets as output. Refer here for more info.
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion" : "1.0.0.0",
"parameters": {
"vnetaddresspace": {
"type": "array",
"defaultValue":["192.168.0.0/16"]
},
"subnetnames":{
"type": "array",
"defaultValue": ["web", "business","data"]
},
"subnetAddress":{
"type": "array",
"defaultValue": ["192.168.0.0/24","192.168.1.0/24", "192.168.2.0/24"]
}
},
"variables":{
"vnetname": "ntier"
},
"resources":[
{
"name": "[variables('vnetname')]",
"type": "Microsoft.Network/virtualNetworks",
"apiVersion": "2019-04-01",
"location": "[resourceGroup().location]",
"properties": {
"addressSpace": {
"addressPrefixes": "[parameters('vnetaddresspace')]"
}
}
},
{
"name": "[concat(variables('vnetname'),'/',parameters('subnetnames')[copyIndex()])]",
"type": "Microsoft.Network/virtualNetworks/subnets",
"apiVersion": "2019-04-01",
"properties": {
"addressPrefix": "[parameters('subnetAddress')[copyIndex()]]"
},
"dependsOn": ["[variables('vnetname')]"],
"copy": {
"name": "websitescopy",
"count": "[length(parameters('subnetnames'))]",
"mode": "serial"
}
}
],
"outputs": {
"subnets-count": {
"type": "int",
"value": "[length(parameters('subnetnames'))]"
}
}
}
-
Try to create deployment and look at the outputs section
-
Microsoft has developed lot of sample templates for various deployments. Refer Here
-
If you would like to create user defined functions with in arm template, Refer Here
Whats left
- How can i call existing template from my arm template
- How to create parameters file
- How do i execute arm templates from CLI and Powershell
