10-26-2007
Well a simple solution if you have a test machine would be to take a filesystem list of the machine, install the software on that a see what gets added.
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LEARN ABOUT CENTOS
machine-id
MACHINE-ID(5) machine-id MACHINE-ID(5)
NAME
machine-id - Local machine ID configuration file
SYNOPSIS
/etc/machine-id
DESCRIPTION
The /etc/machine-id file contains the unique machine ID of the local system that is set during installation. The machine ID is a single
newline-terminated, hexadecimal, 32-character, lowercase machine ID string. When decoded from hexadecimal, this corresponds with a
16-byte/128-bit string.
The machine ID is usually generated from a random source during system installation and stays constant for all subsequent boots.
Optionally, for stateless systems, it is generated during runtime at boot if it is found to be empty.
The machine ID does not change based on user configuration or when hardware is replaced.
This machine ID adheres to the same format and logic as the D-Bus machine ID.
Programs may use this ID to identify the host with a globally unique ID in the network, which does not change even if the local network
configuration changes. Due to this and its greater length, it is a more useful replacement for the gethostid(3) call that POSIX specifies.
The systemd-machine-id-setup(1) tool may be used by installer tools to initialize the machine ID at install time.
RELATION TO OSF UUIDS
Note that the machine ID historically is not an OSF UUID as defined by RFC 4122[1], nor a Microsoft GUID; however, starting with systemd
v30, newly generated machine IDs do qualify as v4 UUIDs.
In order to maintain compatibility with existing installations, an application requiring a UUID should decode the machine ID, and then
apply the following operations to turn it into a valid OSF v4 UUID. With "id" being an unsigned character array:
/* Set UUID version to 4 --- truly random generation */
id[6] = (id[6] & 0x0F) | 0x40;
/* Set the UUID variant to DCE */
id[8] = (id[8] & 0x3F) | 0x80;
(This code is inspired by "generate_random_uuid()" of drivers/char/random.c from the Linux kernel sources.)
HISTORY
The simple configuration file format of /etc/machine-id originates in the /var/lib/dbus/machine-id file introduced by D-Bus. In fact, this
latter file might be a symlink to /etc/machine-id.
SEE ALSO
systemd(1), systemd-machine-id-setup(1), gethostid(3), hostname(5), machine-info(5), os-release(5), sd-id128(3), sd_id128_get_machine(3)
NOTES
1. RFC 4122
https://tools.ietf.org/html/rfc4122
systemd 208 MACHINE-ID(5)