kevinveenbirkenbach/docker-volume-backup
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Refactored database logic

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Kevin Veen-Birkenbach 2023-12-25 21:57:23 +01:00
parent 50db914c36
commit 79f4cb5e7f
1 changed files with 30 additions and 49 deletions
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79
backup-docker-to-local.py
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@ -35,39 +35,25 @@ def create_backup_directories(base_dir, machine_id, repository_name, backup_time
pathlib.Path(version_dir).mkdir(parents=True, exist_ok=True)
return version_dir
# OK
# Muss modifiziert werden.
def get_database_name(container):
"""Extract the database name from the container name."""
return re.split("(_|-)(database|db)", container)[0]
# OK
def backup_mariadb(container, databases, version_dir):
"""Backup database if applicable."""
def backup_database(container, databases, version_dir, db_type):
"""Backup database (MariaDB or PostgreSQL) if applicable."""
database_name = get_database_name(container)
database_entry = databases.loc[databases['database'] == database_name].iloc[0]
mysqldump_destination_dir = os.path.join(version_dir, "sql")
pathlib.Path(mysqldump_destination_dir).mkdir(parents=True, exist_ok=True)
mysqldump_destination_file = os.path.join(mysqldump_destination_dir, f"{database_name}_backup.sql")
database_backup_command = f"docker exec {container} /usr/bin/mariadb-dump -u {database_entry['username']} -p{database_entry['password']} {database_entry['database']} > {mysqldump_destination_file}"
execute_shell_command(database_backup_command)
def backup_postgres(container, databases, version_dir):
"""Backup PostgreSQL database if applicable."""
database_name = get_database_name(container)
database_entry = databases.loc[databases['database'] == database_name].iloc[0]
pg_dump_destination_dir = os.path.join(version_dir, "sql")
pathlib.Path(pg_dump_destination_dir).mkdir(parents=True, exist_ok=True)
pg_dump_destination_file = os.path.join(pg_dump_destination_dir, f"{database_name}_backup.sql")
# Docker command to execute pg_dump and save the output on the host system
database_backup_command = (
f"docker exec -i {container} pg_dump -U {database_entry['username']} "
f"-d {database_entry['database']} -h localhost "
f"--no-password"
)
# Redirect the output of docker exec to a file on the host system
full_command = f"PGPASSWORD={database_entry['password']} {database_backup_command} > {pg_dump_destination_file}"
execute_shell_command(full_command)
backup_destination_dir = os.path.join(version_dir, "sql")
pathlib.Path(backup_destination_dir).mkdir(parents=True, exist_ok=True)
backup_destination_file = os.path.join(backup_destination_dir, f"{database_name}_backup.sql")
if db_type == 'mariadb':
backup_command = f"docker exec {container} /usr/bin/mariadb-dump -u {database_entry['username']} -p{database_entry['password']} {database_entry['database']} > {backup_destination_file}"
elif db_type == 'postgres':
backup_command = f"PGPASSWORD={database_entry['password']} docker exec -i {container} pg_dump -U {database_entry['username']} -d {database_entry['database']} -h localhost --no-password > {backup_destination_file}"
execute_shell_command(backup_command)
# OK
def backup_volume(volume_name, version_dir):
@ -118,6 +104,21 @@ def is_any_image_not_whitelisted(containers, images):
"""Check if any of the containers are using images that are not whitelisted."""
return any(not is_image_whitelisted(container, images) for container in containers)
def backup_routine_for_volume(volume_name, containers, databases, version_dir, whitelisted_images):
"""Perform backup routine for a given volume."""
for container in containers:
if has_image(container, 'mariadb'):
backup_database(container, databases, version_dir, 'mariadb')
elif has_image(container, 'postgres'):
backup_database(container, databases, version_dir, 'postgres')
else:
if is_any_image_not_whitelisted(containers, whitelisted_images):
stop_containers(containers)
backup_volume(volume_name, version_dir)
start_containers(containers)
else:
backup_volume(volume_name, version_dir)
def main():
print('Start backup routine...')
dirname = os.path.dirname(__file__)
@ -137,30 +138,10 @@ def main():
if not containers:
print('Skipped due to no running containers using this volume.')
continue
mariadb_container = get_container_with_image(containers,'mariadb')
if mariadb_container:
print(f"Backup MariaDB database for container: {mariadb_container}")
backup_mariaddb(mariadb_container, databases, version_dir)
else:
postgres_container = get_container_with_image(containers,'postgres')
if postgres_container:
print(f"Backup Postgres database for container: {postgres_container}")
backup_postgres(postgres_container, databases, version_dir)
# Data backup
else:
# Just copy without stopping
backup_volume(volume_name, version_dir)
# If container if not whitelisted stop and start container afterwards.
if is_any_image_not_whitelisted(containers, []):
stop_containers(containers)
backup_volume(volume_name, version_dir)
start_containers(containers)
backup_routine_for_volume(volume_name, containers, databases, version_dir, [])
print('Finished volume backups.')
#print('Restart docker service...')
#execute_shell_command("systemctl restart docker")
#print('Finished backup routine.')
if __name__ == "__main__":
main()