Aws Interview Questions:


1).How to troubleshoot  the aws ec2 kernel panic issue in cloud environment?



How to troubleshoot the aws kernel panic issues in aws cloud?



1).Take the snapshot for panic instances


2).create new instances in same avilibity zone


3).detach the root volume from panic instance and attach 


to the rescue instances 


4).mount the panic instances and restore the kernel version


5).stop the recue instances and detach the root volume and 


reattach the rescue instances 


so, In this way we can troubleshoot the aws kernel 


panic issue.



run the following commands , to verify the root volume is

attached to the rescue instances.

lsblk =

its list out the block devices

craete the mount point and mount to the disk 

next we need to mount the /dev, /run,/proc, /sys

sudo mount -o bind /dev /mount/dev


sudo mount -o bind /sys /mount/sys



sudo mount -o bind /proc /mount/proc


sudo mount -o bind /ys /mount/sys

run the chroot command on the mounted/mnt file system

chroot /mnt

sudo grub2-mkconfig -o /boot/grub2/grub.cfg

sudo Dracut -f -v

this is the tool . which is used to enhanced the automating the linux

boot process

we can execute the command like as the,

exit

unmount /mnt/{dev,proc,run,sys}.

detach the root volume from the recue instances

and attach to the panic instance

start the original instances




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