Openshift Assisted Installer Networking prerequisites

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A DHCP server unless using static IP addressing.
A base domain name. 

The OpenShift Container Platform cluster’s network must also meet the following requirements:
Connectivity between all cluster nodes
Connectivity for each node to the internet
Access to an NTP server for time synchronization between the cluster nodes

Example DNS zone database

$TTL 1W
@	IN	SOA	ns1.example.com.	root (
			2019070700	; serial
			3H		; refresh (3 hours)
			30M		; retry (30 minutes)
			2W		; expiry (2 weeks)
			1W )		; minimum (1 week)
	IN	NS	ns1.example.com.
	IN	MX 10	smtp.example.com.
;
;
ns1.example.com.		IN	A	192.168.1.1
smtp.example.com.		IN	A	192.168.1.5
;
helper.example.com.		IN	A	192.168.1.5
;
api.ocp4.example.com.		IN	A	192.168.1.5 1
api-int.ocp4.example.com.	IN	A	192.168.1.5 2
;
*.apps.ocp4.example.com.	IN	A	192.168.1.5 3
;
control-plane0.ocp4.example.com.	IN	A	192.168.1.97 4
control-plane1.ocp4.example.com.	IN	A	192.168.1.98
control-plane2.ocp4.example.com.	IN	A	192.168.1.99
;
worker0.ocp4.example.com.	IN	A	192.168.1.11 5
worker1.ocp4.example.com.	IN	A	192.168.1.7
;
;EOF
  1. Provides name resolution for the Kubernetes API. The record refers to the IP address of the API load balancer. ↩︎
  2. Provides name resolution for the Kubernetes API. The record refers to the IP address of the API load balancer and is used for internal cluster communications. ↩︎
  3. Provides name resolution for the wildcard routes. The record refers to the IP address of the application ingress load balancer. The application ingress load balancer targets the machines that run the Ingress Controller pods. The Ingress Controller pods run on the worker machines by default. ↩︎
  4. Provides name resolution for the control plane machines. ↩︎
  5. Provides name resolution for the worker machines. ↩︎

Example DNS zone database for reverse records

$$TTL 1W
@	IN	SOA	ns1.example.com.	root (
			2019070700	; serial
			3H		; refresh (3 hours)
			30M		; retry (30 minutes)
			2W		; expiry (2 weeks)
			1W )		; minimum (1 week)
	IN	NS	ns1.example.com.
;
5.1.168.192.in-addr.arpa.	IN	PTR	api.ocp4.example.com. 
5.1.168.192.in-addr.arpa.	IN	PTR	api-int.ocp4.example.com. 
;
97.1.168.192.in-addr.arpa.	IN	PTR	control-plane0.ocp4.example.com. 
98.1.168.192.in-addr.arpa.	IN	PTR	control-plane1.ocp4.example.com.
99.1.168.192.in-addr.arpa.	IN	PTR	control-plane2.ocp4.example.com.
;
11.1.168.192.in-addr.arpa.	IN	PTR	worker0.ocp4.example.com. 
7.1.168.192.in-addr.arpa.	IN	PTR	worker1.ocp4.example.com.
;
;EOF

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