如何为Azure ARM模板添加CustomScriptForLinux扩展修改Linux VM的/etc/hosts

Got it, let's get that CustomScript extension set up to modify your /etc/hosts file right in your ARM template. Here's how to complete and refine the snippet you shared, plus key details to make it work smoothly:

Full Extension Resource Definition #

Add this complete block to your template.json (make sure it's placed alongside your VM resource, or within the resources array):

{
  "name": "[concat(parameters('virtualMachineName'),'/edithosts')]",
  "type": "Microsoft.Compute/virtualMachines/extensions",
  "apiVersion": "2023-07-01",
  "location": "[parameters('location')]",
  "dependsOn": [
    "[resourceId('Microsoft.Compute/virtualMachines', parameters('virtualMachineName'))]"
  ],
  "properties": {
    "publisher": "Microsoft.Azure.Extensions",
    "type": "CustomScript",
    "typeHandlerVersion": "2.1",
    "autoUpgradeMinorVersion": true,
    "settings": {},
    "protectedSettings": {
      "commandToExecute": "echo '192.168.1.100 my-custom-host.local' >> /etc/hosts"
    }
  }
}

Critical Notes for Your Setup #

• DependsOn: This ensures the extension only runs after the VM is fully created—no race conditions here.
• Command Customization: Replace the example '192.168.1.100 my-custom-host.local' with the exact IP and hostname you want to add. For multiple lines, chain commands with &&:

  "commandToExecute": "echo 'line1' >> /etc/hosts && echo 'line2' >> /etc/hosts"
  

• Dynamic Values: If you want to use parameterized values (like a hostname from your parameters.json), tweak the command with template expressions:

  "commandToExecute": "[concat('echo ''', parameters('targetHostIp'), ' ', parameters('targetHostname'), ''' >> /etc/hosts')]"
  

  Just remember to add those new parameters (targetHostIp and targetHostname) to your parameters.json file.

Verify It Works #

Run your existing deployment command as usual:

New-AzureRmResourceGroupDeployment -TemplateFile .\template.json -TemplateParameterFile .\parameters.json -ResourceGroupName my-rg -virtualMachineName my-test-vm

Once deployed, SSH into the VM and check /etc/hosts—your new line should be there.

内容的提问来源于stack exchange，提问作者Paul Croarkin