Increasing number of inodes on DLC volume for machine executor, CircleCI

inode_increase.sh

# Steps to reformat DLC drive and add more inodes. Should increase number from ~3m to ~52m
# Copy the contents of this file to a bash script and execute the script in a run step
# Alternatively, copy the commands into a multi-line command in the CircleCI config

function reformat() {
  # (2) Stop Docker daemon
  # If using Docker 18+, then use `sudo systemctl stop docker` instead
  sudo service docker stop

  # (3) Unmount the device
  sudo umount /var/lib/docker

  # (4) Force reformat the device
  sudo mke2fs -FF -i 1024 /dev/sdb

  # (5) Remount the device
  sudo mount /dev/sdb /var/lib/docker

  # (6) Restart Docker daemon
  # If using Docker 18+, then use commented command instead
  # sudo systemctl start docker
  sudo service docker start

  # (7) Create sentinel file for future jobs to check and avoid formatting
  echo "formatted" > /var/lib/docker/inodes
}

# (1) Check sentinel file to see if volume already formatted. If not, reformat
test -f /var/lib/docker/inodes && reformat || echo "Already increased inodes. Skipping"