There was a feature request to support cluster without external DNS dependency - https://issues.redhat.com/browse/RFE-4002

We already support it, just the documentation is not clear enough to advertise it.

We need to document - 

• document that's possible to boot with the internal DNS server
• document that it's required to specify an external DNS server when internet access is required

```

1. When installing SNO with assisted installer you don't need to configure the DNS for the installation to complete successfully.
2. When installing multi-node cluster with assisted-installer you don't need to configure DNS externally if you are using cluster managed networking (baremetal platform).

In all cases if you want to resolve the cluster API or ingress endpoints from outside the cluster you need to configure DNS for resolving the name to the right IP

```

The current documentation has to be updated as it is not clear and not accurate

```

A DNS A/AAAA record for each node in the cluster when using User Managed Networking, or the installation will not proceed. DNS A/AAAA records are required for each node in the cluster when using Cluster Managed Networking after installation is complete to connect to the cluster, but installation can proceed without the A/AAAA records when using Cluster Managed Networking. 

```

"DNS A/AAAA records are required for each node in the cluster when using Cluster Managed Networking after installation is complete to connect to the cluster" - i guess it is a typo and had to be "DNS A/AAAA records are required for each node in the cluster when using User Managed Networking". But it is still not accurate, as afaik, node records are not required, only  api-int, api and apps records.