AWS instance, Failed to start LSB: Bring up/down networking error message

I would start by troubleshooting using the EC2 Serial Console - try and determine what drivers or modules are not loading correctly and causing connectivity issues.

If you're starting from a public AMI, launch an instance based on that AMI and make sure that it boots correctly; then make changes one-by-one until you get to the change that causes the error messages you're seeing.

This is the solution

    1. Stop the impaired instance and detach the root volume.
    2. Attach the root volume on another rescue instance (which is running in the same availability zone).
    3. Check the disk/volume attached and mount it.

            $ sudo lsblk
            $ sudo lsblk -f
            $ mkdir /rescue
            $ mount /dev/xvdf1 /rescue

    4. Mount the required pseudo filesystems and chroot into the environment.

            $ for i in proc sys dev run; do mount --bind /$i /rescue/$i ; done
            $ chroot /rescue

    5. Check the cloud-init configurations and the cloud-init package, if it is installed.

            $ ls -l /etc/cloud/
            $ sudo rpm -qa | grep cloud-init
            $ sudo yum install cloud-init


    6. Exit from the chroot environment and unmount the filesystems.

            $ exit
            $ for i in proc sys dev run; do umount /rescue/$i ; done
            $ umount /rescue

    8. Detach the root volume from the rescue instance and attach it to the original instance.

    9. Start the instance.