os_clean_images.sh

#!/bin/bash

# Exit immediately if a command exits with a non-zero status
set -e

# Fix OS potential issue/bug: "sudo: unable to resolve host..."
sudo sed -i /etc/hosts -e "s/^127.0.0.1 localhost$/127.0.0.1 localhost $(hostname)/"

# Installing necessary tool for the script: python-glanceclient
sudo pip install python-openstackclient==3.11.0

echo -e "----------------------------------\n   $(date)   \n----------------------------------"
del_date=$(date +"%Y-%m-%d" --date="1 days ago")
echo -e "Openstack - Looking for old KubewNow images:\n "

# Extracting both KubeNow images that are flagged as "test" or "current".
# Using tee (which almost always return 0) because of set -e at the beginning and possible grep's exit code -1 here.
openstack image list | grep -E 'kubenow-v([0-9]*)(a?b?)([0-9]*)-([0-9]*)-([a-z0-9]*)-([test]*)([current]*)' | awk '{print $2, $4}' | tee /tmp/os_out_images.txt

tot_no_images=$(wc -l </tmp/os_out_images.txt)
counter_del_img=0

if [ "$tot_no_images" -gt "0" ]; then

  # Finding Image IDs of AMIs older than 1 day which needed to be deregistered
  while read -r line; do
    openstack image show "$(echo "$line" | awk '{print $1}')" >/tmp/os_img_details.txt
    img_date=$(grep -i "created_at" </tmp/os_img_details.txt | awk '{print $4}' | sed -e 's/T.*//')

    if [[ ! "$img_date" > "$del_date" ]]; then
      # Extracting image's "Name" and "ImageId"
      id_to_delete=$(echo "$line" | awk '{print $1}')
      name=$(echo "$line" | awk '{print $2}')
      echo -e "Following old image dated $img_date is found \nName: $name \nID:$id_to_delete"

      # Deleting old KubeNow Image
      printf "Starting to delete old KubewNow image: %s...\n\n" "$id_to_delete"
      openstack image delete "$id_to_delete"
      counter_del_img=$((counter_del_img + 1))
      echo -e "Keep looking for any other old KubeNow image...\n"
    fi
  done </tmp/os_out_images.txt

  if [ "$counter_del_img" == "0" ]; then
    echo -e "No old images dated $del_date were found \n"
  fi

else
  echo -e "No KubeNow iamges flagged as test or current were found"
fi

echo -e "\nNo of deleted image: $counter_del_img\nDone.\n"