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When you configure vDiscovery jobs, you can enable the appliance to automatically create DNS records for discovered virtual entities in your VNets. When you enable this feature, NIOS automatically adds Host records or A and PTR records to the authoritative zones for the discovered IP addresses based on your configuration. You can also enter a formula that NIOS uses to create the DNS names for the discovered IP addresses based on their VM parameters such as vm_name or discovered_name for data discovered through Azure. By doing so, NIOS is able to discover public and private IP addresses by looking up the corresponding DNS names.
Discovered data includes IP addresses for the VMs and associated information such as VM name, VM ID, tenant ID, and others. Note that corresponding zones must already exist in order for NIOS to add DNS records. Otherwise, NIOS does not add any DNS records and it logs a message to the syslog.
NIOS automatically adds DNS records (in the network views specified for vDiscovery) based on the following conditions:
- The corresponding DNS zones must already exist in the NIOS database. NIOS does not automatically create DNS zones for the records.
- To create a PTR records, the corresponding reverse-mapping zone must exist.
- A DNS zone cannot be associated with more than one DNS view. NIOS does not create DNS records for zones that are associated with multiple DNS views.
- NIOS adds new DNS records only if the VM name for the discovered IP address is available and there is no conflict between the discovered data and the associated network view.
The following matrix captures some scenarios about how vDiscovery handles various actions and what the outcome is for the information on the Cloud Platform appliance and in the NIOS database.
Note: vDiscovery modifies records that are created by the vDiscovery process only. It does not create or update DNS records that are originally created by other admin users.
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Actions and Conditions
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Cloud Platform Data before vDiscovery
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Cloud Platform Data after vDiscovery
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NIOS Data before vDiscovery
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NIOS Data after vDiscovery
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- Add new VM (vma) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; no DNS records
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No data for vma
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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- Add new VM (vma) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery or admin)
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No data for vma
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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- Add new interface to existing VM (vma) with the same discovered name on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1,
10.10.10.2)
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- Add new interface to existing VM (vma) with the same discovered name on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by admin)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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- Add new interface to existing VM (vma) with different discovered name (vmb) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vma.corp1.com 10.10.10.2
vmb.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
Host record: vmb.corp1.com (10.10.10.2)
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- Add new interface to existing VM (vma) with different discovered name (vmb) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by admin)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vma.corp1.com 10.10.10.2
vmb.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
Host record: vmb.corp1.com (10.10.10.2)
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- Remove existing VM (vma) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery)
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10.10.10.1
vma.corp1.com
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No data for vma
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
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- Remove existing VM (vma) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by admin)
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10.10.10.1
vma.corp1.com
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No data for vma
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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- Remove existing interface (10.10.10.2) from VM (vma) with different discovered name (vmb) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery)
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10.10.10.1
vma.corp1.com 10.10.10.2
vmb.corp1.com
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
Host record: vmb.corp1.com (10.10.10.2)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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- Remove existing interface (10.10.10.2) from VM (vma) with different discovered name (vmb) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by admin)
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10.10.10.1
vma.corp1.com 10.10.10.2
vmb.corp1.com
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
Host record: vmb.corp1.com (10.10.10.2)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
Host record: vmb.corp1.com (10.10.10.2)
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- Update record name (from vma to vm1) for the existing interface (10.10.10.1) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vm1.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vm1.corp1.com (10.10.10.1)
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- Update record name (from vma to vm1) for the existing interface (10.10.10.1) on Cloud Platform appliance
- Automatic creation of Host records
- In NIOS: existing zone corp1.com; existing Host record (originally created by admin)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vm1.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
Host record: vm1.corp1.com (10.10.10.1)
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- Automatic creation of Host records
- Change FQDN template from ${discover_name) to ${vm_name}
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery)
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10.10.10.1
vma.corp1.com vm_name: ABC
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10.10.10.1
vm1.corp1.com vm_name: ABC
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: ABC.corp1.com (10.10.10.1)
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- Automatic creation of Host records
- Change FQDN template from ${discover_name) to ${vm_name}
- In NIOS: existing zone corp1.com; existing Host record (originally created by admin)
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10.10.10.1
vma.corp1.com vm_name: ABC
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10.10.10.1
vm1.corp1.com vm_name: ABC
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
Host record: ABC.corp1.com (10.10.10.1)
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- Change vDiscovery task configuration from creation of Host record to A and PTR records
- In NIOS: existing zone corp1.com; existing Host record (originally created by vDiscovery)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
A record: vma.corp1.com (10.10.10.1)
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- Change vDiscovery task configuration from creation of Host record to A and PTR records
- In NIOS: existing zone corp1.com; existing Host record (originally created by admin)
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10.10.10.1
vma.corp1.com
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10.10.10.1
vma.corp1.com
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
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Zone: corp1.com
Host record: vma.corp1.com (10.10.10.1)
A record: vma.corp1.com (10.10.10.1)
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Note: If the ${vm_name} parameter of an instance contains any special character, the appliance will not be able to identify this instance and will convert it to a managed VM using the vm_id parameter.
Click Add(+).