URL: https://rol.redhat.com/rol/app/courses/do188-4.12/pages/ch06
Reporter RHNID: ctiwary@redhat.com
Section: 1 - Troubleshooting Containers
Language: en-US (English)
Workaround:

Description: Ch06s01 & 02 :

To verify the application ports in use, list the open network ports in the running container. Use Linux commands such as the socket statistics (ss) command to list open ports. A socket is the combination of a port and an IP address. The ss command lists the open sockets in a system. You can provide the ss command with options to filter and produce the desired output:

-p: display the process using the socket

-a: display listening and established connections

-n: display IP addresses

-t: display TCP sockets

the ss man page says that : -n, --numeric
Do not try to resolve service names. Show exact bandwidth
values, instead of human-readable.

refer this thread : https://learn.redhat.com/t5/Red-Hat-Academy/DO188-error-in-Chapter-6-Section-1/m-p/34761#M407