azure-vm-standard-ssd-required: Azure VM Premium SSD Not Required

id: azure-vm-standard-ssd-required
info:
  name: Azure VM Premium SSD Not Required
  author: princechaddha
  severity: high
  description: |
    Ensure that your Microsoft Azure virtual machines (VMs) are using Standard SSD disk volumes instead of Premium SSD volumes for cost-effective storage that fits a broad range of workloads from web servers to enterprise applications that need consistent performance at lower IOPS levels. Unless you are running mission-critical applications or performance sensitive workloads that need more than 6000 IOPS or 750 MiB/s of throughput per VM disk volume, Cloud Conformity recommends converting your Premium SSD volumes to Standard SSD in order to lower the cost of your Azure monthly bill.
  impact: |
    Using Premium SSD volumes when not required can significantly increase the cost without providing necessary benefits for non-critical workloads, leading to inefficient resource utilization and budget overruns.
  remediation: |
    Convert any Premium SSD volumes to Standard SSD unless the workload requires high performance disk specifications. This can be achieved through Azure's portal or via CLI commands.
  reference:
    - https://docs.microsoft.com/en-us/azure/virtual-machines/disks-types
  tags: cloud,devops,azure,microsoft,virtual-machine,azure-cloud-config

flow: |
  code(1);
  for (let VMData of iterate(template.vmList)) {
    VMData = JSON.parse(VMData);
    set("ids", VMData.id);
    code(2);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az vm list --query '[*].{"id":id}'

    extractors:
      - type: json
        name: vmList
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      az vm show --ids "$ids" --query 'storageProfile.{"osDiskStorageType":osDisk.managedDisk.storageAccountType,"dataDiskStorageType":dataDisks[*].managedDisk.storageAccountType}'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'Premium_LRS'

    extractors:
      - type: dsl
        dsl:
          - 'ids + " is using Premium SSD volumes for OS or data disks which is not recommended for its current workload"'
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