LiveCD Re-Installs

This page will go over how to setup a re-install on a node.

  1. Backup to the data partition:

    pit# mkdir -pv /var/www/ephemeral/backup
pit# pushd /var/www/ephemeral/backup
pit# tar -czvf "dnsmasq-data-$(date  '+%Y-%m-%d_%H-%M-%S').tar.gz" /etc/dnsmasq.*
pit# tar -czvf "network-data-$(date  '+%Y-%m-%d_%H-%M-%S').tar.gz" /etc/sysconfig/network/*
pit# cp -pv /etc/hosts ./
pit# popd
pit# umount /var/www/ephemeral

    Now the USB stick can be unplugged, it contains all the information we already loaded plus backups of initialized files.

  2. Plug the stick into a new machine, or make a backup on the booted NCN. Make a snapshot of the USB stick.

    mylinuxpc> mount /dev/disk/by-label/PITDATA /mnt
mylinuxpc> tar -czvf --exclude *.squashfs "install-data-$(date  '+%Y-%m-%d_%H-%M-%S').tar.gz" /mnt/
mylinuxpc> umount /dev/disk/by-label/PITDATA

  3. The new tar.gz file you made can be stored anywhere, and can be used to reinit the liveCD. Follow the directions in 005-LIVECD-CREATION and then return here and move onto the next step.

  4. Now you can create a newer LiveCD on the same USB stick, clobbering whats there. Once created the install-data partition can be remounted and you can restore/extract the backup:

    mylinuxpc> mount /dev/disk/by-label/PITDATA /mnt
mylinuxpc> tar -xzvf $(ls -ltR *.tar.gz | head -n 1)
mylinuxpc> ls -R /mnt

  5. The tarball should have extracted everything into the install-data partition. You will need to re-fetch your squashFS artifacts, they can be fetched into (respectively):

  • /mnt/var/www/ephemeral/k8s/
  • /mnt/var/www/ephemeral/ceph/

Once fetched, attach the USB to a CRAY non-compute node and reboot into the USB stick.

  1. Once booted into the USB stick; restore network config, dnsmasq, and ensure pods are started.

    # STOP AND INSPECT ANY FAILURE IN ANY OF THESE COMMANDS
# DO NOT PASS GO ; DO NOT COLLECT $200
pit# tar -xzvf /var/www/ephemeral/backup/dnsmasq*.tar.gz
pit# tar -xzvf /var/www/ephemeral/backup/network*.tar.gz
pit# systemctl restart wicked wickedd-nanny
pit# systemctl restart dnsmasq
pit# systemctl start basecamp nexus

  2. You now have a revitalized LiveCD with previous configuration.