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如何理解OracleLinux中的machine-id

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 Oracle Linux7machine-id

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".

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，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。


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