I tried to add swapfile to the root file system on AWS EC2 instance. Did I made a mistake during the edit of fstab?
sudo dd if=/dev/zero of=/swapfile bs=1G count=4 chmod 600 /swapfile mkswap /swapfile swapon /swapfile swapon -s
I have edited /etc/fstab
vi /etc/fstab /swapfile swap swap defaults 0 0
Swap worked fine but after reboot, a system doesn’t work. I have decided to attach device to another instance and remove a line in fstab, but it can’t be mounted on another instance.
mount: wrong fs type, bad option, bad superblock on /dev/xvdf, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so.
How can I edit fstab and remove a line with swap data on unmounted device?
NAME FSTYPE LABEL UUID MOUNTPOINT xvda `-xvda1 ext4 cloudimg-rootfs 7b2XXX-16d3-XXXX-b32e-1857XXXXXXXX / xvdf `-xvdf1
It looks like you were able to pull that console output using a CLI command.
Unfortunately unless you are running your root filesystem device with Elastic Block Storage as an EBS-backed volume, there is no way to recover your root filesystem (which you will have to mount to actually modify /etc/fstab). If this is an instance-store volume, I don’t believe there is a way to recover it.
Sorry for the bad news…
Source : Link , Question Author : Goran , Answer Author : frontsidebus