# User-provisioned DNS requirements
This section covers the host entries that need to be made in the base domain to enable installation of Red Hat OpenShift Container Platform 4.9.
Red Hat OpenShift Container Platform 4.9 uses three types of DNS records (A, CNAME, and SRV). The host names and their types are described in Table 20.
Table 20. DNS entries for Red Hat OpenShift Container Platform
| Hosts | DNS Record Types |
|---|---|
| master_nodes | A |
| worker_nodes | A |
| bootstrap_nodes | A |
| installer VM | A |
| *, api, api-int, haproxy | A |
| Etcd | CNAME, SRV |
To add the appropriate records, follow these steps:
'A' type resource record [ Host (A) ]. An A record specifies an IPv4 address. Example entries are shown in Table 21. Ensure that these entries are created for all the nodes in the installation environment.
Table 21. 'A' type DNS entry
Host (A) IP Address Host name master_nodes master_ip master_name.cluster_name.baseDomain worker_nodes worker_ip worker_name.cluster_name.baseDomain bootstrap_nodes bootstrap_ip bootstrap_name.cluster_name.baseDomain installer VM installer_ip installer_name.cluster_name.baseDomain * haproxy_ip *.apps.cluster_name.baseDomain Api haproxy_ip api.cluster_name.baseDomain api-int haproxy_ip api-int.cluster_name.baseDomain haproxy haproxy_ip haproxy_name.cluster_name.baseDomain Create a CNAME resource record [ Alias (CNAME) ] in DNS. Example entries are shown in Table 22. Ensure that these entries are created for all of the master nodes.
Table 22. DNS entries for Red Hat OpenShift Container Platform
Host (CNAME) Target host name etcd-0 *master01_name.cluster_name.baseDomain etcd-1 *master02_name.cluster_name.baseDomain etcd-2 *master03_name.cluster_name.baseDomain
NOTE
Replace the italicized components in the examples above with the actual values that align to the installation environment.
For each master node, Red Hat OpenShift Container Platform also requires a Service Location (SRV) DNS record for the etcd server on that machine with priority 0, weight 10, and port 2380. The SRV record is used to identify computers that host specific services.
