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https://github.com/kevinveenbirkenbach/docker-volume-backup.git
synced 2024-10-31 23:33:11 +01:00
refactored. untested.
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@ -1,6 +1,6 @@
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#!/bin/python
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# Backups volumes of running containers
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#
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import subprocess
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import os
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import re
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@ -8,114 +8,80 @@ import pathlib
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import pandas
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from datetime import datetime
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class RsyncCode24Exception(Exception):
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"""Exception for rsync error code 24."""
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"""rsync warning: some files vanished before they could be transferred"""
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class BackupException(Exception):
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"""Generic exception for backup errors."""
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pass
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def bash(command):
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def execute_shell_command(command):
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"""Execute a shell command and return its output."""
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print(command)
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process = subprocess.Popen([command], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
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out, err = process.communicate()
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stdout = out.splitlines()
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stderr = err.decode("utf-8")
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output = [line.decode("utf-8") for line in stdout]
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if process.returncode != 0:
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raise BackupException(f"Error in command: {command}\nOutput: {out}\nError: {err}\nExit code: {process.returncode}")
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return [line.decode("utf-8") for line in out.splitlines()]
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exitcode = process.wait()
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if exitcode != 0:
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print(f"Error in command: {command}\nOutput: {out}\nError: {err}\nExit code: {exitcode}")
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def get_machine_id():
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"""Get the machine identifier."""
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return execute_shell_command("sha256sum /etc/machine-id")[0][0:64]
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if "rsync" in command and exitcode == 24:
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raise RsyncCode24Exception(f"rsync error code 24 encountered: {stderr}")
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def create_backup_directories(base_dir, machine_id, repository_name, backup_time):
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"""Create necessary directories for backup."""
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version_dir = os.path.join(base_dir, machine_id, repository_name, backup_time)
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pathlib.Path(version_dir).mkdir(parents=True, exist_ok=True)
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return version_dir
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raise Exception("Exit code is greater than 0")
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def get_database_name(container):
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"""Extract the database name from the container name."""
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return re.split("(_|-)(database|db)", container)[0]
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return output
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def print_bash(command):
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output = bash(command)
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print(list_to_string(output))
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return output
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def list_to_string(list):
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return str(' '.join(list))
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print('start backup routine...')
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dirname = os.path.dirname(__file__)
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repository_name = os.path.basename(dirname)
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# identifier of this backups
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machine_id = bash("sha256sum /etc/machine-id")[0][0:64]
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# Folder in which all Backups are stored
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backups_dir = '/Backups/'
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# Folder in which the versions off docker volume backups are stored
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versions_dir = backups_dir + machine_id + "/" + repository_name + "/"
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# Time when the backup started
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backup_time = datetime.now().strftime("%Y%m%d%H%M%S")
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# Folder containing the current version
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version_dir = versions_dir + backup_time + "/"
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# Create folder to store version in
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pathlib.Path(version_dir).mkdir(parents=True, exist_ok=True)
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print('start volume backups...')
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print('load connection data...')
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databases = pandas.read_csv(dirname + "/databases.csv", sep=";")
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volume_names = bash("docker volume ls --format '{{.Name}}'")
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for volume_name in volume_names:
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print('start backup routine for volume: ' + volume_name)
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containers = bash("docker ps --filter volume=\"" + volume_name + "\" --format '{{.Names}}'")
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if len(containers) == 0:
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print('skipped due to no running containers using this volume.')
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else:
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container = containers[0]
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# Folder to which the volumes are copied
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volume_destination_dir = version_dir + volume_name
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# Database name
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database_name = re.split("(_|-)(database|db)", container)[0]
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# Entries with database login data concerning this container
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databases_entries = databases.loc[databases['database'] == database_name]
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# Exception for akaunting due to fast implementation
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if len(databases_entries) == 1 and container != 'akaunting':
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print("Backup database...")
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mysqldump_destination_dir = volume_destination_dir + "/sql"
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mysqldump_destination_file = mysqldump_destination_dir + "/backup.sql"
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def backup_database(container, databases, version_dir):
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"""Backup database if applicable."""
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database_name = get_database_name(container)
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database_entry = databases.loc[databases['database'] == database_name].iloc[0]
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mysqldump_destination_dir = os.path.join(version_dir, "sql")
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pathlib.Path(mysqldump_destination_dir).mkdir(parents=True, exist_ok=True)
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database_entry = databases_entries.iloc[0]
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database_backup_command = "docker exec " + container + " /usr/bin/mariadb-dump -u " + database_entry["username"] + " -p" + database_entry["password"] + " " + database_entry["database"] + " > " + mysqldump_destination_file
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print_bash(database_backup_command)
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print("Backup files...")
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files_rsync_destination_path = volume_destination_dir + "/files"
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mysqldump_destination_file = os.path.join(mysqldump_destination_dir, "backup.sql")
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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}"
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execute_shell_command(database_backup_command)
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def backup_volume(volume_name, version_dir):
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"""Backup files of a volume."""
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files_rsync_destination_path = os.path.join(version_dir, volume_name, "files")
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pathlib.Path(files_rsync_destination_path).mkdir(parents=True, exist_ok=True)
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versions = os.listdir(versions_dir)
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versions.sort(reverse=True)
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if len(versions) > 1:
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last_version = versions[1]
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last_version_files_dir = versions_dir + last_version + "/" + volume_name + "/files"
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if os.path.isdir(last_version_files_dir):
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link_dest_parameter="--link-dest='" + last_version_files_dir + "' "
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else:
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print("No previous version exists in path "+ last_version_files_dir + ".")
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link_dest_parameter=""
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else:
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print("No previous version exists in path "+ last_version_files_dir + ".")
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link_dest_parameter=""
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source_dir = "/var/lib/docker/volumes/" + volume_name + "/_data/"
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rsync_command = "rsync -abP --delete --delete-excluded " + link_dest_parameter + source_dir + " " + files_rsync_destination_path
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try:
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print_bash(rsync_command)
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except RsyncCode24Exception:
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print("Ignoring rsync error code 24, proceeding with the next command.")
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print("stop containers...")
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print("Backup data after container is stopped...")
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print_bash("docker stop " + list_to_string(containers))
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print_bash(rsync_command)
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print("start containers...")
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print_bash("docker start " + list_to_string(containers))
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print("end backup routine for volume:" + volume_name)
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print('finished volume backups.')
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print('restart docker service...')
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print_bash("systemctl restart docker")
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print('finished backup routine.')
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source_dir = f"/var/lib/docker/volumes/{volume_name}/_data/"
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rsync_command = f"rsync -abP --delete --delete-excluded {source_dir} {files_rsync_destination_path}"
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execute_shell_command(rsync_command)
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def main():
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print('Start backup routine...')
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dirname = os.path.dirname(__file__)
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repository_name = os.path.basename(dirname)
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machine_id = get_machine_id()
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backups_dir = '/Backups/'
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backup_time = datetime.now().strftime("%Y%m%d%H%M%S")
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version_dir = create_backup_directories(backups_dir, machine_id, repository_name, backup_time)
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print('Start volume backups...')
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databases = pandas.read_csv(os.path.join(dirname, "databases.csv"), sep=";")
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volume_names = execute_shell_command("docker volume ls --format '{{.Name}}'")
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for volume_name in volume_names:
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print(f'Start backup routine for volume: {volume_name}')
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containers = execute_shell_command(f"docker ps --filter volume=\"{volume_name}\" --format '{{.Names}}'")
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if not containers:
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print('Skipped due to no running containers using this volume.')
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continue
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for container in containers:
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if container != 'akaunting':
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backup_database(container, databases, version_dir)
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backup_volume(volume_name, version_dir)
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print('Finished volume backups.')
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print('Restart docker service...')
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execute_shell_command("systemctl restart docker")
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print('Finished backup routine.')
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if __name__ == "__main__":
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main()
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