Backup einrichten

Mit folgendem Backup-Script (bash) können wir die Datenbank sichern. Diese können wir außerdem mit systemd per Service und Timer automatisieren. Alternativ kann das Bash-Script auch als Cronjob eingebunden werden.

backup.service

[Unit]
Description=Backup Service

[Service]
Type=oneshot
ExecStart=/home/fabaccess/fabaccess-repos/bffh-scripts/backup.sh

backup.sh

#!/bin/bash

# Database dump command
DB_DUMP_CMD="/home/fabaccess/fabaccess-repos/bffh/target/release/bffhd -c /home/fabaccess/fabaccess-repos/bffh/examples/bffh.dhall --dump-users"

# Backup directory
BACKUP_DIR="/home/fabaccess/backups"

# Number of backups to keep
NUM_BACKUPS_TO_KEEP=5

# Dry run flag
DRY_RUN=false

# Parse command-line options
while getopts ":n:r" opt; do
	case $opt in
	n)
		NUM_BACKUPS_TO_KEEP="$OPTARG"
		;;
	r)
		DRY_RUN=true
		;;
	\?)
		echo "Invalid option: -$OPTARG" >&2
		exit 1
		;;
	:)
		echo "Option -$OPTARG requires an argument." >&2
		exit 1
		;;
	esac
done

# Current date and time
CURRENT_DATE=$(date +"%Y%m%d%H%M%S")

# Create a backup file name
BACKUP_FILE="$BACKUP_DIR/db_backup_$CURRENT_DATE.toml"

# Execute the database dump command
if [ "$DRY_RUN" = true ]; then
	echo "Dry run mode: Database backup command will not be executed."
else
	$DB_DUMP_CMD $BACKUP_FILE
fi

# Check if the database dump was successful
if [ $? -eq 0 ]; then
	echo "Database backup completed successfully."

	# Sort backup files by modification time in ascending order
	sorted_backup_files=($(ls -t "$BACKUP_DIR"))

	# Determine number of backups to delete
	num_backups_to_delete=$((${#sorted_backup_files[@]} - NUM_BACKUPS_TO_KEEP))

	# Delete oldest backups if necessary
	if [ $num_backups_to_delete -gt 0 ]; then
		for ((i = 0; i < $num_backups_to_delete; i++)); do
			if [ "$DRY_RUN" = true ]; then
				echo "Dry run mode: Would remove old backup: ${sorted_backup_files[$i]}"
			else
				rm "${sorted_backup_files[$i]}"
				echo "Removed old backup: ${sorted_backup_files[$i]}"
			fi
		done
	fi

else
	echo "Error: Database backup failed."
fi

backup.timer

[Unit]
Description=Backup Timer

[Timer]
# Run every day at midnight
OnCalendar=daily
Persistent=true

[Install]
WantedBy=timers.target