mongodb-restore.sh

# Set the source and destination directories
src="user@remote.server:/path/to/backup/directory"
dst="/path/to/mongodb/data/directory"

# Set the email address to send alerts to
email_address="your@email.com"

# Set the log file
log_file="/path/to/log/file.log"

# Decrypt the password using the private key
password=$(gpg --decrypt password.gpg)

# Check if password decryption was successful
if [ $? -ne 0 ]; then
  echo "$(date): Decryption of password failed." >> "$log_file"
  echo "The decryption of the password for the MongoDB backup failed." | mail -s "Restore Failure" "$email_address"
  exit 1
fi

# Create a temporary directory to store the decrypted backups
tmp_dir=$(mktemp -d)

# Download the encrypted backup from the remote server
rsync -av "$src" "$tmp_dir"
if [ $? -ne 0 ]; then
  echo "$(date): Download of the MongoDB backup from $src failed." >> "$log_file"
  echo "The download of the MongoDB backup from $src failed." | mail -s "Restore Failure" "$email_address"
  rm -rf "$tmp_dir"
  exit 1
fi

# Decrypt the backup using openssl
openssl enc -d -aes-256-cbc -in "$tmp_dir/encrypted.tar.gz" -out "$tmp_dir/decrypted.tar.gz" -pass "pass:$password"
if [ $? -ne 0 ]; then
  echo "$(date): Decryption of the MongoDB backup failed." >> "$log_file"
  echo "The decryption of the MongoDB backup failed." | mail -s "Restore Failure" "$email_address"
  rm -rf "$tmp_dir"
  exit 1
fi

# Extract the tar archive to the temporary directory
tar -xzvf "$tmp_dir/decrypted.tar.gz" -C "$tmp_dir"
if [ $? -ne 0 ]; then
  echo "$(date): Extraction of the MongoDB backup failed." >> "$log_file"
  echo "The extraction of the MongoDB backup failed." | mail -s "Restore Failure" "$email_address"
  rm -rf "$tmp_dir"
  exit 1
fi

# Stop the MongoDB service or process
systemctl stop mongod
if [ $? -ne 0 ]; then
  mongod --shutdown
  if [ $? -ne 0 ]; then
    echo "$(date): Stopping the MongoDB service or process failed." >> "$log_file"
    echo "Stopping the MongoDB service or process failed. Please stop the service or process manually before proceeding with the restore operation." | mail -s "Restore Failure" "$email_address"
    rm -rf "$tmp_dir"
    exit 1
  fi
fi

# Restore the MongoDB database from the dump
mongorestore --host localhost --db mydatabase "$tmp_dir/mydatabase"
if [ $? -ne 0 ]; then
  echo "$(date): Restore of the MongoDB database failed." >> "$log_file"
  echo "The restore of the MongoDB database from the backup at $src failed." | mail -s "Restore Failure" "$email_address"
  rm -rf "$tmp_dir"
  exit 1
else
  echo "The restore of the MongoDB database from the backup at $src completed successfully." >> "$log_file"
  echo "The restore of the MongoDB database from the backup at $src completed successfully." | mail -s "Restore Success" "$email_address"
fi

# Start the MongoDB service or process
systemctl start mongod

# Clean up the temporary directory
rm -rf "$tmp_dir"