kevinveenbirkenbach/docker-volume-backup
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Reimplemented incremental backup and improved downtime

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This commit is contained in:
Kevin Veen-Birkenbach 2023-12-26 18:22:06 +01:00
parent e0fc263dcb
commit 162b3eec06
1 changed files with 19 additions and 6 deletions
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25
backup-docker-to-local.py
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@ -80,13 +80,26 @@ def backup_database(container, databases, volume_dir, db_type):
execute_shell_command(backup_command) execute_shell_command(backup_command)
print(f"Database backup for {container} completed.") print(f"Database backup for {container} completed.")
def backup_volume(volume_name, volume_dir): def get_last_backup_dir(versions_dir, volume_name):
"""Backup files of a volume.""" """Get the most recent backup directory for the specified volume."""
versions = sorted(os.listdir(versions_dir), reverse=True)
for version in versions:
backup_dir = os.path.join(versions_dir, version, volume_name, "files")
if os.path.isdir(backup_dir):
return backup_dir
return None
def backup_volume(volume_name, volume_dir, versions_dir):
"""Backup files of a volume with incremental backups."""
print(f"Starting backup routine for volume: {volume_name}") print(f"Starting backup routine for volume: {volume_name}")
files_rsync_destination_path = os.path.join(volume_dir, "files") files_rsync_destination_path = os.path.join(volume_dir, "files")
pathlib.Path(files_rsync_destination_path).mkdir(parents=True, exist_ok=True) pathlib.Path(files_rsync_destination_path).mkdir(parents=True, exist_ok=True)
last_backup_dir = get_last_backup_dir(versions_dir, volume_name)
link_dest_option = f"--link-dest='{last_backup_dir}'" if last_backup_dir else ""
source_dir = f"/var/lib/docker/volumes/{volume_name}/_data/" source_dir = f"/var/lib/docker/volumes/{volume_name}/_data/"
rsync_command = f"rsync -abP --delete --delete-excluded {source_dir} {files_rsync_destination_path}" rsync_command = f"rsync -abP --delete --delete-excluded {link_dest_option} {source_dir} {files_rsync_destination_path}"
execute_shell_command(rsync_command) execute_shell_command(rsync_command)
print(f"Backup routine for volume: {volume_name} completed.") print(f"Backup routine for volume: {volume_name} completed.")
@ -145,12 +158,12 @@ def backup_routine_for_volume(volume_name, containers, databases, version_dir, w
elif has_image(container, 'postgres'): elif has_image(container, 'postgres'):
backup_database(container, databases, volume_dir, 'postgres') backup_database(container, databases, volume_dir, 'postgres')
else: else:
# Backup without start, stop to keep downtime low
backup_volume(volume_name, volume_dir, version_dir)
if is_any_image_not_whitelisted(containers, whitelisted_images): if is_any_image_not_whitelisted(containers, whitelisted_images):
stop_containers(containers) stop_containers(containers)
backup_volume(volume_name, volume_dir) backup_volume(volume_name, volume_dir, version_dir)
start_containers(containers) start_containers(containers)
else:
backup_volume(volume_name, volume_dir)
def main(): def main():
print('Start backup routine...') print('Start backup routine...')