ZGENHOSTID(8) System Manager’s Manual ZGENHOSTID(8)
NAME
zgenhostid — generate host ID into /etc/hostid
SYNOPSIS
zgenhostid [−f] [−o filename] [hostid]
DESCRIPTION
Creates /etc/hostid file and stores the host ID in it. If hostid was provided, validate and store that value. Otherwise, randomly generate an ID.
OPTIONS
−h
Display a summary of the command-line options.
−f
Allow output overwrite.
−o filename
Write to filename instead of the default /etc/hostid.
hostid
Specifies the value to be placed in /etc/hostid. It should be a number with a value between 1 and 2ˆ32-1. If 0, generate a random ID. This value must be unique among your systems. It must be an 8-digit-long hexadecimal number, optionally prefixed by "0x".
FILES
/etc/hostid
EXAMPLES
Generate a random hostid and store it
# zgenhostid
Record the libc-generated hostid in /etc/hostid
# zgenhostid "$(hostid)"
Record a custom hostid (
0xdeadbeef) in /etc/hostid
# zgenhostid deadbeef
Record a custom hostid (
0x01234567) in /tmp/hostid and overwrite the file
if it exists
# zgenhostid −f −o /tmp/hostid 0x01234567
SEE ALSO
genhostid(1), hostid(1), sethostid(3), spl(4)
HISTORY
zgenhostid emulates the genhostid(1) utility and is provided for use on systems which do not include the utility or do not provide the sethostid(3) function. OpenZFS May 26, 2021 ZGENHOSTID(8)