What is machine-id
![Machine Id For Mac Machine Id For Mac](/uploads/1/0/5/5/105526191/134858023.jpg)
– 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 to a 16-byte/128-bit string.
– The “machine-id” parameter is added from RHEL 7.1 to identify the machine in the network. Therefore this parameter must be unique.
– But when user clone the virtual machine that is installed RHEL 7.1, the cloned virtual machine’s “machine-id” is not changed, and some virtual machine may have the same “machine-id”.
– The user should change the “machine-id” of the cloned virtual machine for the server to be uniquely identifiable over the network.
– The machine-id is written into the file /etc/machine-id
– The “machine-id” parameter is added from RHEL 7.1 to identify the machine in the network. Therefore this parameter must be unique.
– But when user clone the virtual machine that is installed RHEL 7.1, the cloned virtual machine’s “machine-id” is not changed, and some virtual machine may have the same “machine-id”.
– The user should change the “machine-id” of the cloned virtual machine for the server to be uniquely identifiable over the network.
– The machine-id is written into the file /etc/machine-id
Changing the machine-id
1. Clear the original “machine-id”
– The “machine-id” value is written in “/etc/machine-id”.
– We can either remove or empty the machine-id file to clear out the original value.
– The “machine-id” value is written in “/etc/machine-id”.
– We can either remove or empty the machine-id file to clear out the original value.
Your machine ID is your Ethernet ID/MAC address: 6 pairs of numbers and letters A-F. You may see the pairs un-separated (d312a930bc7f), separated by colons (d3:12:a9:30:bc:7f) or separated by dashes (d3-12-a9-30-bc-7f). On Windows, go to the Start menu, then in the search box type 'cmd' and hit Enter. In the cmd window, type 'ipconfig /all'. I need to calculate a machine id for computers running MacOS, but I don't know where to retrieve the informations - stuff like HDD serial numbers etc.The main requirement for my particular application is that the user mustn't be able to spoof it.
2. Create the new “machine-id” value
Generate a new machine-id by the “systemd-machine-id-setup” command which populates the remove file again with a new and unique machine-id value.
Generate a new machine-id by the “systemd-machine-id-setup” command which populates the remove file again with a new and unique machine-id value.
![Machine Id For Mac Machine Id For Mac](/uploads/1/0/5/5/105526191/226484824.jpg)
3. Verify
Verify the new value of machine-id.
Verify the new value of machine-id.
Machine Id For Mac Shortcut
NOTE : This is applicable to CentOS / RHEL version 7.1 and above.