Setup Ubuntu OS Boot files¶
In this section we will perform 2 tasks
- Download and mount the ISO Live CD.
- Extract the vmlinuz and initrd files from the LiveCD to the tftp folder
Step 1 Download and Mount the ISO.¶
¶
# lets host the ISO in the folder /iso
mkdir -p /srv/tftp/iso
# Download the ISO
[ ! -f /srv/tftp/iso/ubuntu-20.04.6-live-server-amd64.iso ] && wget -P /srv/tftp/iso https://releases.ubuntu.com/20.04.6/ubuntu-20.04.6-live-server-amd64.iso
# Create mount folder
mkdir -p /srv/isoubuntu
# mount the ISO to view contents.
mount -o loop,ro -t iso9660 /srv/tftp/iso/ubuntu-20.04.6-live-server-amd64.iso /srv/isoubuntu
# list content to validate
ls /srv/isoubuntu
Step 2 Extract vmlinuz and initrd¶
Run the commands below to extract the boot files.
#create ubuntu folder to store the boot files.
# this way we can have boot files for multple distros if required.
mkdir -p /srv/tftp/ubuntu/casper
# copy files
cp /srv/isoubuntu/casper/vmlinuz /srv/tftp/ubuntu/casper
cp /srv/isoubuntu/casper/initrd /srv/tftp/ubuntu/casper
Validate The boot files will be served via http. Do validate if this folder and content is listed.
Validate if accessible via HTTP
As we have already setup nginx to list directory content. This should be visible via browser.
Click tftp and iso to list the ISO LiveCD.
Step 2 Extract vmlinuz and initrd¶
Boot files.¶
When booting a Server with Linux, there are 2 files required.
vmlinuz and initrd at times the version is part of the name depending on Linux flavors
In this example boot files are retrieved from ubuntu-20.04.6-live-server-amd64.iso
Run the commands below to extract the boot files.
#create ubuntu folder to store the boot files.
# this way we can have boot files for multple distros if required.
mkdir -p /srv/tftp/ubuntu/casper
# copy files
cp /srv/isoubuntu/casper/vmlinuz /srv/tftp/ubuntu/casper
cp /srv/isoubuntu/casper/initrd /srv/tftp/ubuntu/casper
Validate The boot files will be served via http. Do validate if this folder and content is listed.
## Next step
At this stage we have made all the required files available for the boot process. Next we will put in the final piece for the setup to function.