Can you share the details of the server and Linux Operating system installed on the server? One way to access iDRAC from host OS is by installing racadm software. After that you can run racadm commands and configure iDRAC. Refer below link for more details on racadm [URL]
Hi, I have attached a keyboard and monitor to a R730xd server, and would like to access iDrac. However, I see the login prompt from the installed OS.  I found no way to switch to iDrac without rebooting. I'm sure it must be possible somehow?  Best regards, Brian
Access iDrac from server attached monitor/keyboard without rebooting