Monday, 29 April 2019

How to resolve Unable to mount root fs on unknown-block issue of EC2 server by Raj Gupta

If our EC2 server are giving the below error:-



Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)


Root caused:-

Amazon EBS-backed

• Device not attached correctly.
• Root device not attached at correct device point.
• Filesystem not in expected format.
• Use of legacy kernel (such as 2.6.16-XenU).
• A recent kernel update on your instance (faulty update, or an update bug)


Instance store-backed

• Hardware device failure.

Solution:- 

A.  If server is Amazon EBS-backed:-

• Stop and then restart the instance. 
• Modify root volume to attach at the correct device point, possible /dev/sda1 instead of / dev/sda. 
• Stop and modify to use modern kernel. 
• Refer to the documentation for your Linux distribution to check for known update bugs. Change or reinstall the kernel. 

B. If server is Instance store-backed:-

Terminate the instance and launch a new instance using a modern kernel. 

1 comment:

  1. Hello everyone , here’s your opportunity for you to achieve your dreams of being a multi million dollar rich through trading , I once loss all I got through trading but was fortunate to come across a woman with great virtue and selfless heart (Mary ) i was introduce to her masterclass strategy while searching online which has revived me of all my losses and made me gain more and more . With her unique strategy you are entitled to daily signals and instant withdraw ,be rest assured of getting a refund of all your loss investment with any platform that has denied you in one way or the other in getting your money . Mrs Mary masterclass strategy is simply the best for beginners and those that are finding it difficult to succeed through trading she’ll help you with just a simple step . Email her ( maryshea03 @ Gmail .com) WhatsApp +1 562 384 7738 . Remember this is absolutely free!!!

    ReplyDelete