1.9. Verifying DNS resolution

Verify the full forward and reverse DNS resolution using a fully-qualified domain name to prevent issues while installing Satellite.

Procedure

  1. Ensure that the host name and local host resolve correctly: 

    # ping -c1 localhost
# ping -c1 `hostname -f` # my_system.domain.com

    Successful name resolution results in output similar to the following: 

    # ping -c1 localhost
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.043 ms

--- localhost ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.043/0.043/0.043/0.000 ms

# ping -c1 `hostname -f`
PING hostname.gateway (XX.XX.XX.XX) 56(84) bytes of data.
64 bytes from hostname.gateway (XX.XX.XX.XX): icmp_seq=1 ttl=64 time=0.019 ms

--- localhost.gateway ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.019/0.019/0.019/0.000 ms

  2. To avoid discrepancies with static and transient host names, set all the host names on the system by entering the following command: 

    # hostnamectl set-hostname name

For more information, see the Configuring Host Names Using hostnamectl in the Red Hat Enterprise Linux 7 Networking Guide.

警告

Name resolution is critical to the operation of Satellite 6. If Satellite cannot properly resolve its fully qualified domain name, tasks such as content management, subscription management, and provisioning will fail.