Monday, 29 April 2019

How to resolve Error: Unable to determine major/minor number of root device... (Root file system/device mismatch) Error of EC2 server by Raj Gupta

If our EC2 server are giving the below error:-



ERROR: Unable to determine major/minor number of root device '/dev/xvda1'.


Root caused:-

• Missing or incorrectly configured virtual block device driver
• Device enumeration clash (sda versus xvda or sda instead of sda1)
• Incorrect choice of instance kernel

Solution:- 

A.  If server is Amazon EBS-backed:-

Use the following procedure: 

1. Stop the instance. 
2. Detach the volume. 
3. Fix the device mapping problem. 
4. Start the instance. 
5. Modify the AMI to address device mapping issues.

B. If server is Instance store-backed:-

Use the following procedure: 

1. Create a new AMI with the appropriate fix (map block device correctly). 
2. Terminate the instance and launch a new instance from the AMI you created.


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