This is how to setup iDRAC's racadm tool on Proxmox 7/8. And iDRAC Service Module (iSM).

Install

Fetch the GPG key

curl -fsSL https://linux.dell.com/repo/pgp_pubkeys/0x1285491434D8786F.asc | \
gpg --dearmor -o /etc/apt/trusted.gpg.d/dell-apt-key.gpg

Add source file

Create a file at /etc/apt/sources.list.d/linux.dell.com.sources.list and put the following contents:

deb [signed-by=/etc/apt/trusted.gpg.d/dell-apt-key.gpg] http://linux.dell.com/repo/community/openmanage/11000/jammy jammy main
# For Proxmox 7
#deb [signed-by=/etc/apt/trusted.gpg.d/dell-apt-key.gpg] http://linux.dell.com/repo/community/openmanage/10300/focal focal main
# If you want iDRAC Service Module(iSM)
deb [signed-by=/etc/apt/trusted.gpg.d/dell-apt-key.gpg] http://linux.dell.com/repo/community/openmanage/iSM/5100/bullseye bullseye main

The 10300 (v10.3.0.0) part is the OMSA version found on the matrix available on DELL's page

if you use the jammy release on Debian 11 it will throw uses unknown compression for member 'control.tar.zst', giving up at install time. This is explained on stackoverflow

Install it

apt install srvadmin-idracadm8 dcism

Try racadm

racadmin getsysinfo

with dcism you need a reboot !

On Proxmox 8

I added back deb http://ftp.debian.org/debian bullseye main to the /etc/apt/sources.list file and ran: apt install libssl1.1. Because the binary /opt/dell/srvadmin/isM/bin/Invoke-iSMPKIHelper needs it (ldd /opt/dell/srvadmin/iSM/bin/Invoke-iSMPKIHelper).

And after added a file /etc/apt/preferences.d/bullseye with the contents:

Package: *
Pin: release n=bullseye
Pin-Priority: -1