Wednesday, 24 April 2019

How to resolve Hard-coded MAC address of EC2 by Raj Gupta

If our EC2 server are giving the below error



... Bringing up loopback interface: [ OK ]
Bringing up interface eth0: Device eth0 has different MAC address than expected, ignoring. [FAILED] Starting auditd: [ OK ]

Root caused:-

There is a hardcoded interface MAC in the AMI configuration

Solution:-

A.  If server is Amazon EBS-backed:-

Do one of the following: 

• Modify the AMI to remove the hardcoding and relaunch the instance. 
• Modify the instance to remove the hardcoded MAC address.

OR use below 

1. Stop the instance. 
2. Detach the root volume. 
3. Attach the volume to another instance and modify the volume to remove the hardcoded MAC address. 
4. Attach the volume to the original instance. 
5. Start the instance.

B. If server is Instance store-backed:-

Do one of the following: 

• Modify the instance to remove the hardcoded MAC address. 
• Terminate the instance and launch a new instance.

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