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This article is about how to understand machine-id in Oracle Linux. I think it is very practical, so I share it with you. I hope you can get something after reading this article. Let's take a look at it.

Oracle Linux7machine-id

Introduction to machine-id:

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.

Ways to change machine-id:

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 setup 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".

#

The above is how to understand the machine-id in Oracle Linux. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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