如何理解Oracle Linux中的machine-id

本篇文章給大家分享的是有關如何理解Oracle Linux中的machine-id，小編覺得挺實用的，因此分享給大家學習，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。

 Oracle Linux7machine-id

machine-id的介紹:

• 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.

改變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".

Example :

# 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".
#

以上就是如何理解Oracle Linux中的machine-id，小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業(yè)資訊頻道。