/lib/udev/rules.d/65-drbd.rules is in drbd-utils 8.9.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | # This file contains the rules to create named DRBD devices.
SUBSYSTEM!="block", GOTO="drbd_end"
KERNEL!="drbd*", GOTO="drbd_end"
IMPORT{program}="/sbin/drbdadm sh-udev minor-%m"
# Use symlink from the environment if available
ENV{SYMLINK}!="", SYMLINK="$env{SYMLINK}", GOTO="have_symlink"
# Legacy rules for older DRBD 8.3 & 8.4 when drbdadm sh-udev did not yet export SYMLINK
ENV{DISK}!="", SYMLINK+="drbd/by-disk/$env{DISK}"
ENV{RESOURCE}!="", SYMLINK+="drbd/by-res/$env{RESOURCE}"
LABEL="have_symlink"
ENV{DEVICE}=="drbd_?*", SYMLINK+="$env{DEVICE}"
LABEL="drbd_end"
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