关于Oracle Linux中的machine-id

关于Oracle Linux中的machine-id
参考自:

How to Change the "machine-id" of Oracle Linux 7.1 and Later (Doc ID 2127429.1)

machine-id的介绍:

• The "machine-id" parameter is added from Oracle Linux 7.1 to identify the machine in the network. Therefor this parameter must be unique.
• But when user clone the virtual machine that is installed OL7.1,the cloned virtual machine's "machine-id" is not changed,and some virtual machine have the same "machine-id".
• User should change the "machine-id" of the cloned virtual machine.

改变machine-id的方法:

To execute the below operations on the cloned virtual machine with the "root" account.

1. Clear the original "machine-id".

• The "machine-id" value is written in "/etc/machine-id".
• User have to clear the original value of "machine-id" befor changing.
• There are some ways to change the "/etc/machine-id" file,in this case,use the "cp" command to change the original value.

Example :

# cat /etc/machine-id
e2bd0adf084a4c289cf335da4cd2f4b4 * Original "machine-id".
#
# cp -f /dev/null /etc/machine-id
cp: overwrite '/etc/machine-id'? * Clear original value.
#
# cat /etc/machine-id
# * Value has been cleared.

2. Create the new "machine-id" value.

• generate a new machine-id by the "systemd-machine-id-setup" command and set up to the "/etc/machine-id".

# cat /etc/machine-id # * "/etc/machine-id" is empty. # systemd-machine-id-setup Initializing machine ID from random generator. * Success to generate and setup the new value. # # cat /etc/machine-id dab09965986b4ea1ba34dc7a79bb2830 * New value of "machine-id". #