How can I find out from which initrd image in /boot/ a RedHat system has been booted from, assuming that there are multiple entries in /etc/grub.conf with the same kernel but different initrd-*.img files? (dmesg doesn't show it and there is no link from /initrd.)
If the entries in your
grub.confare in fact identical then there's really no good way to tell. If thegrub.confentries have slightly different kernel options, you could look at/proc/cmdlineto see what options were used to boot the current kernel.