749 lines
26 KiB
Python
749 lines
26 KiB
Python
#!/usr/bin/env python3
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# autobackup.py - PVC API Autobackup functions
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2024 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, version 3.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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from datetime import datetime
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from json import load as jload
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from json import dump as jdump
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from os import popen, makedirs, path, scandir
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from shutil import rmtree
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from subprocess import run, PIPE
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from time import time
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from daemon_lib.common import run_os_command
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from daemon_lib.config import get_autobackup_configuration
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from daemon_lib.celery import start, fail, log_info, log_err, update, finish
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import daemon_lib.ceph as ceph
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import daemon_lib.vm as vm
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def send_execution_failure_report(
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celery_conf, config, recipients=None, total_time=0, error=None
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):
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if recipients is None:
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return
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from email.utils import formatdate
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from socket import gethostname
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log_message = f"Sending email failure report to {', '.join(recipients)}"
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log_info(celery_conf[0], log_message)
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update(
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celery_conf[0],
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log_message,
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current=celery_conf[1] + 1,
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total=celery_conf[2],
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)
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current_datetime = datetime.now()
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email_datetime = formatdate(float(current_datetime.strftime("%s")))
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email = list()
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email.append(f"Date: {email_datetime}")
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email.append(
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f"Subject: PVC Autobackup execution failure for cluster '{config['cluster']}'"
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)
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email_to = list()
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for recipient in recipients:
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email_to.append(f"<{recipient}>")
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email.append(f"To: {', '.join(email_to)}")
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email.append(f"From: PVC Autobackup System <pvc@{gethostname()}>")
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email.append("")
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email.append(
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f"A PVC autobackup has FAILED at {current_datetime} in {total_time}s due to an execution error."
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)
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email.append("")
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email.append("The reported error message is:")
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email.append(f" {error}")
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try:
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with popen("/usr/sbin/sendmail -t", "w") as p:
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p.write("\n".join(email))
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except Exception as e:
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log_err(f"Failed to send report email: {e}")
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def send_execution_summary_report(
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celery_conf, config, recipients=None, total_time=0, summary=dict()
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):
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if recipients is None:
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return
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from email.utils import formatdate
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from socket import gethostname
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log_message = f"Sending email summary report to {', '.join(recipients)}"
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log_info(celery_conf[0], log_message)
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update(
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celery_conf[0],
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log_message,
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current=celery_conf[1] + 1,
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total=celery_conf[2],
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)
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current_datetime = datetime.now()
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email_datetime = formatdate(float(current_datetime.strftime("%s")))
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email = list()
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email.append(f"Date: {email_datetime}")
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email.append(f"Subject: PVC Autobackup report for cluster '{config['cluster']}'")
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email_to = list()
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for recipient in recipients:
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email_to.append(f"<{recipient}>")
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email.append(f"To: {', '.join(email_to)}")
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email.append(f"From: PVC Autobackup System <pvc@{gethostname()}>")
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email.append("")
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email.append(
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f"A PVC autobackup has been completed at {current_datetime} in {total_time}s."
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)
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email.append("")
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email.append(
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"The following is a summary of all current VM backups after cleanups, most recent first:"
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)
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email.append("")
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for vm_name in summary.keys():
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email.append(f"VM: {vm_name}:")
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for backup in summary[vm_name]:
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datestring = backup.get("datestring")
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backup_date = datetime.strptime(datestring, "%Y%m%d%H%M%S")
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if backup.get("result", False):
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email.append(
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f" {backup_date}: Success in {backup.get('runtime_secs', 0)} seconds, ID {datestring}, type {backup.get('type', 'unknown')}"
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)
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email.append(
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f" Backup contains {len(backup.get('backup_files'))} files totaling {ceph.format_bytes_tohuman(backup.get('backup_size_bytes', 0))} ({backup.get('backup_size_bytes', 0)} bytes)"
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)
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else:
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email.append(
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f" {backup_date}: Failure in {backup.get('runtime_secs', 0)} seconds, ID {datestring}, type {backup.get('type', 'unknown')}"
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)
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email.append(f" {backup.get('result_message')}")
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try:
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with popen("/usr/sbin/sendmail -t", "w") as p:
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p.write("\n".join(email))
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except Exception as e:
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log_err(f"Failed to send report email: {e}")
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def worker_cluster_autobackup(
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zkhandler, celery, force_full=False, email_recipients=None
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):
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config = get_autobackup_configuration()
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backup_summary = dict()
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current_stage = 0
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total_stages = 1
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if email_recipients is not None:
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total_stages += 1
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start(
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celery,
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f"Starting cluster '{config['cluster']}' VM autobackup",
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current=current_stage,
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total=total_stages,
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)
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if not config["autobackup_enabled"]:
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message = "Autobackups are not configured on this cluster."
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log_info(celery, message)
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return finish(
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celery,
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message,
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current=total_stages,
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total=total_stages,
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)
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autobackup_start_time = datetime.now()
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retcode, vm_list = vm.get_list(zkhandler)
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if not retcode:
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error_message = f"Failed to fetch VM list: {vm_list}"
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log_err(celery, error_message)
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send_execution_failure_report(
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(celery, current_stage, total_stages),
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config,
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recipients=email_recipients,
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error=error_message,
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)
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fail(celery, error_message)
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return False
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backup_suffixed_path = (
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f"{config['backup_root_path']}/{config['backup_root_suffix']}"
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)
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if not path.exists(backup_suffixed_path):
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makedirs(backup_suffixed_path)
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full_interval = config["backup_schedule"]["full_interval"]
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full_retention = config["backup_schedule"]["full_retention"]
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backup_vms = list()
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for vm_detail in vm_list:
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vm_tag_names = [t["name"] for t in vm_detail["tags"]]
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matching_tags = (
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True
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if len(set(vm_tag_names).intersection(set(config["backup_tags"]))) > 0
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else False
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)
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if matching_tags:
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backup_vms.append(vm_detail)
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if len(backup_vms) < 1:
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message = "Found no VMs tagged for autobackup."
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log_info(celery, message)
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return finish(
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celery,
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message,
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current=total_stages,
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total=total_stages,
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)
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if config["auto_mount_enabled"]:
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total_stages += len(config["mount_cmds"])
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total_stages += len(config["unmount_cmds"])
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for vm_detail in backup_vms:
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total_disks = len([d for d in vm_detail["disks"] if d["type"] == "rbd"])
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total_stages += 2 + (2 * total_disks)
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vm_name = vm_detail["name"]
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vm_backup_path = f"{backup_suffixed_path}/{vm_name}"
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autobackup_state_file = f"{vm_backup_path}/.autobackup.json"
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if not path.exists(vm_backup_path) or not path.exists(autobackup_state_file):
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# There are no existing backups so the list is empty
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state_data = dict()
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tracked_backups = list()
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else:
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with open(autobackup_state_file) as fh:
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state_data = jload(fh)
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tracked_backups = state_data["tracked_backups"]
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full_backups = [b for b in tracked_backups if b["type"] == "full"]
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if len(full_backups) > 0:
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last_full_backup = full_backups[0]
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last_full_backup_idx = tracked_backups.index(last_full_backup)
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if force_full or last_full_backup_idx >= full_interval - 1:
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this_backup_retain_snapshot = True
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else:
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this_backup_retain_snapshot = False
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else:
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# The very first ackup must be full to start the tree
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this_backup_retain_snapshot = True
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if this_backup_retain_snapshot:
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total_stages += total_disks
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log_info(
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celery,
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f"Found {len(backup_vms)} suitable VM(s) for autobackup: {', '.join([b['name'] for b in backup_vms])}",
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)
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# Handle automount mount commands
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if config["auto_mount_enabled"]:
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for cmd in config["mount_cmds"]:
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current_stage += 1
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update(
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celery,
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f"Executing mount command '{cmd.split()[0]}'",
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current=current_stage,
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total=total_stages,
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)
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ret = run(
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cmd.split(),
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stdout=PIPE,
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stderr=PIPE,
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)
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if ret.returncode != 0:
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error_message = f"Failed to execute mount command '{cmd.split()[0]}': {ret.stderr.decode().strip()}"
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log_err(celery, error_message)
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send_execution_failure_report(
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(celery, current_stage, total_stages),
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config,
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recipients=email_recipients,
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total_time=datetime.now() - autobackup_start_time,
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error=error_message,
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)
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fail(celery, error_message)
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return False
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# Execute the backup: take a snapshot, then export the snapshot
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for vm_detail in backup_vms:
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vm_name = vm_detail["name"]
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dom_uuid = vm_detail["uuid"]
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vm_backup_path = f"{backup_suffixed_path}/{vm_name}"
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autobackup_state_file = f"{vm_backup_path}/.autobackup.json"
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if not path.exists(vm_backup_path) or not path.exists(autobackup_state_file):
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# There are no existing backups so the list is empty
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state_data = dict()
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tracked_backups = list()
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else:
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with open(autobackup_state_file) as fh:
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state_data = jload(fh)
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tracked_backups = state_data["tracked_backups"]
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full_backups = [b for b in tracked_backups if b["type"] == "full"]
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if len(full_backups) > 0:
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last_full_backup = full_backups[0]
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last_full_backup_idx = tracked_backups.index(last_full_backup)
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if force_full:
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this_backup_incremental_parent = None
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this_backup_retain_snapshot = True
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elif last_full_backup_idx >= full_interval - 1:
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this_backup_incremental_parent = None
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this_backup_retain_snapshot = True
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else:
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this_backup_incremental_parent = last_full_backup["datestring"]
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this_backup_retain_snapshot = False
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else:
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# The very first ackup must be full to start the tree
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this_backup_incremental_parent = None
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this_backup_retain_snapshot = True
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now = datetime.now()
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datestring = now.strftime("%Y%m%d%H%M%S")
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snapshot_name = f"backup_{datestring}"
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# Take the VM snapshot (vm.vm_worker_create_snapshot)
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snap_list = list()
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def cleanup_failure():
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for snapshot in snap_list:
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rbd, snapshot_name = snapshot.split("@")
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pool, volume = rbd.split("/")
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# We capture no output here, because if this fails too we're in a deep
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# error chain and will just ignore it
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ceph.remove_snapshot(zkhandler, pool, volume, snapshot_name)
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rbd_list = zkhandler.read(("domain.storage.volumes", dom_uuid)).split(",")
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for rbd in rbd_list:
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current_stage += 1
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update(
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celery,
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f"[{vm_name}] Creating RBD snapshot of {rbd}",
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current=current_stage,
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total=total_stages,
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)
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pool, volume = rbd.split("/")
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ret, msg = ceph.add_snapshot(
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zkhandler, pool, volume, snapshot_name, zk_only=False
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)
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if not ret:
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cleanup_failure()
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error_message = msg.replace("ERROR: ", "")
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log_err(celery, error_message)
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send_execution_failure_report(
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(celery, current_stage, total_stages),
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config,
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recipients=email_recipients,
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error=error_message,
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)
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fail(celery, error_message)
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return False
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else:
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snap_list.append(f"{pool}/{volume}@{snapshot_name}")
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current_stage += 1
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update(
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celery,
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f"[{vm_name}] Creating VM configuration snapshot",
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current=current_stage,
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total=total_stages,
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)
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# Get the current timestamp
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tstart = time()
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# Get the current domain XML
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vm_config = zkhandler.read(("domain.xml", dom_uuid))
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# Add the snapshot entry to Zookeeper
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zkhandler.write(
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[
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.name",
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snapshot_name,
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),
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snapshot_name,
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),
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.timestamp",
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snapshot_name,
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),
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tstart,
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),
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.xml",
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snapshot_name,
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),
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vm_config,
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),
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(
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(
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"domain.snapshots",
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dom_uuid,
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"domain_snapshot.rbd_snapshots",
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snapshot_name,
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),
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",".join(snap_list),
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),
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]
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)
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# Export the snapshot (vm.vm_worker_export_snapshot)
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export_target_path = f"{backup_suffixed_path}/{vm_name}/{snapshot_name}/images"
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try:
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makedirs(export_target_path)
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except Exception as e:
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error_message = (
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f"[{vm_name}] Failed to create target directory '{export_target_path}': {e}",
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)
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log_err(celery, error_message)
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send_execution_failure_report(
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(celery, current_stage, total_stages),
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config,
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recipients=email_recipients,
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error=error_message,
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)
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fail(celery, error_message)
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return False
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|
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def export_cleanup():
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from shutil import rmtree
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rmtree(f"{backup_suffixed_path}/{vm_name}/{snapshot_name}")
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export_type = (
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"incremental" if this_backup_incremental_parent is not None else "full"
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)
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# Set the export filetype
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if this_backup_incremental_parent is not None:
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export_fileext = "rbddiff"
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else:
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export_fileext = "rbdimg"
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snapshot_volumes = list()
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for rbdsnap in snap_list:
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pool, _volume = rbdsnap.split("/")
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volume, name = _volume.split("@")
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ret, snapshots = ceph.get_list_snapshot(
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zkhandler, pool, volume, limit=name, is_fuzzy=False
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)
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if ret:
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snapshot_volumes += snapshots
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export_files = list()
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for snapshot_volume in snapshot_volumes:
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snap_pool = snapshot_volume["pool"]
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snap_volume = snapshot_volume["volume"]
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snap_snapshot_name = snapshot_volume["snapshot"]
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snap_size = snapshot_volume["stats"]["size"]
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snap_str = f"{snap_pool}/{snap_volume}@{snap_snapshot_name}"
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current_stage += 1
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update(
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celery,
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f"[{vm_name}] Exporting RBD snapshot {snap_str}",
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current=current_stage,
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total=total_stages,
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)
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if this_backup_incremental_parent is not None:
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retcode, stdout, stderr = run_os_command(
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f"rbd export-diff --from-snap {this_backup_incremental_parent} {snap_pool}/{snap_volume}@{snap_snapshot_name} {export_target_path}/{snap_pool}.{snap_volume}.{export_fileext}"
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)
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if retcode:
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error_message = (
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f"[{vm_name}] Failed to export snapshot for volume(s) '{snap_pool}/{snap_volume}'",
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)
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log_err(celery, error_message)
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send_execution_failure_report(
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(celery, current_stage, total_stages),
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config,
|
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recipients=email_recipients,
|
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error=error_message,
|
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)
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fail(celery, error_message)
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return False
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else:
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export_files.append(
|
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(
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f"images/{snap_pool}.{snap_volume}.{export_fileext}",
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snap_size,
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)
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)
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|
else:
|
|
retcode, stdout, stderr = run_os_command(
|
|
f"rbd export --export-format 2 {snap_pool}/{snap_volume}@{snap_snapshot_name} {export_target_path}/{snap_pool}.{snap_volume}.{export_fileext}"
|
|
)
|
|
if retcode:
|
|
error_message = (
|
|
f"[{vm_name}] Failed to export snapshot for volume(s) '{snap_pool}/{snap_volume}'",
|
|
)
|
|
log_err(celery, error_message)
|
|
send_execution_failure_report(
|
|
(celery, current_stage, total_stages),
|
|
config,
|
|
recipients=email_recipients,
|
|
error=error_message,
|
|
)
|
|
fail(celery, error_message)
|
|
return False
|
|
else:
|
|
export_files.append(
|
|
(
|
|
f"images/{snap_pool}.{snap_volume}.{export_fileext}",
|
|
snap_size,
|
|
)
|
|
)
|
|
|
|
current_stage += 1
|
|
update(
|
|
celery,
|
|
f"[{vm_name}] Writing snapshot details",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|
|
|
|
def get_dir_size(pathname):
|
|
total = 0
|
|
with scandir(pathname) as it:
|
|
for entry in it:
|
|
if entry.is_file():
|
|
total += entry.stat().st_size
|
|
elif entry.is_dir():
|
|
total += get_dir_size(entry.path)
|
|
return total
|
|
|
|
export_files_size = get_dir_size(export_target_path)
|
|
|
|
export_details = {
|
|
"type": export_type,
|
|
"datestring": datestring,
|
|
"snapshot_name": snapshot_name,
|
|
"incremental_parent": this_backup_incremental_parent,
|
|
"vm_detail": vm_detail,
|
|
"export_files": export_files,
|
|
"export_size_bytes": export_files_size,
|
|
}
|
|
try:
|
|
with open(
|
|
f"{backup_suffixed_path}/{vm_name}/{snapshot_name}/snapshot.json", "w"
|
|
) as fh:
|
|
jdump(export_details, fh)
|
|
except Exception as e:
|
|
error_message = (
|
|
f"[{vm_name}] Failed to export configuration snapshot: {e}",
|
|
)
|
|
log_err(celery, error_message)
|
|
send_execution_failure_report(
|
|
(celery, current_stage, total_stages),
|
|
config,
|
|
recipients=email_recipients,
|
|
error=error_message,
|
|
)
|
|
fail(celery, error_message)
|
|
return False
|
|
|
|
# Clean up the snapshot (vm.vm_worker_remove_snapshot)
|
|
if not this_backup_retain_snapshot:
|
|
for snap in snap_list:
|
|
current_stage += 1
|
|
update(
|
|
celery,
|
|
f"[{vm_name}] Removing RBD snapshot {snap}",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|
|
|
|
rbd, name = snap.split("@")
|
|
pool, volume = rbd.split("/")
|
|
ret, msg = ceph.remove_snapshot(zkhandler, pool, volume, name)
|
|
if not ret:
|
|
error_message = msg.replace("ERROR: ", "")
|
|
log_err(celery, error_message)
|
|
send_execution_failure_report(
|
|
(celery, current_stage, total_stages),
|
|
config,
|
|
recipients=email_recipients,
|
|
error=error_message,
|
|
)
|
|
fail(celery, error_message)
|
|
return False
|
|
|
|
current_stage += 1
|
|
update(
|
|
celery,
|
|
f"[{vm_name}] Removing VM configuration snapshot",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|
|
|
|
ret = zkhandler.delete(
|
|
("domain.snapshots", dom_uuid, "domain_snapshot.name", snapshot_name)
|
|
)
|
|
if not ret:
|
|
error_message = (
|
|
f"[{vm_name}] Failed to remove snapshot from Zookeeper",
|
|
)
|
|
log_err(celery, error_message)
|
|
send_execution_failure_report(
|
|
(celery, current_stage, total_stages),
|
|
config,
|
|
recipients=email_recipients,
|
|
error=error_message,
|
|
)
|
|
fail(celery, error_message)
|
|
return False
|
|
|
|
current_stage += 1
|
|
update(
|
|
celery,
|
|
f"Finding obsolete incremental backups for '{vm_name}'",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|
|
|
|
# Read export file to get details
|
|
backup_json_file = f"{vm_backup_path}/{snapshot_name}/snapshot.json"
|
|
with open(backup_json_file) as fh:
|
|
backup_json = jload(fh)
|
|
tracked_backups.insert(0, backup_json)
|
|
|
|
marked_for_deletion = list()
|
|
# Find any full backups that are expired
|
|
found_full_count = 0
|
|
for backup in tracked_backups:
|
|
if backup["type"] == "full":
|
|
found_full_count += 1
|
|
if found_full_count > full_retention:
|
|
marked_for_deletion.append(backup)
|
|
# Find any incremental backups that depend on marked parents
|
|
for backup in tracked_backups:
|
|
if backup["type"] == "incremental" and backup["incremental_parent"] in [
|
|
b["datestring"] for b in marked_for_deletion
|
|
]:
|
|
marked_for_deletion.append(backup)
|
|
|
|
current_stage += 1
|
|
if len(marked_for_deletion) > 0:
|
|
update(
|
|
celery,
|
|
f"Cleaning up aged out backups for '{vm_name}'",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|
|
|
|
for backup_to_delete in marked_for_deletion:
|
|
ret = vm.vm_worker_remove_snapshot(
|
|
zkhandler, None, vm_name, backup_to_delete["snapshot_name"]
|
|
)
|
|
if ret is False:
|
|
error_message = f"Failed to remove obsolete backup snapshot '{backup_to_delete['snapshot_name']}', leaving in tracked backups"
|
|
log_err(celery, error_message)
|
|
else:
|
|
rmtree(f"{vm_backup_path}/{backup_to_delete['snapshot_name']}")
|
|
tracked_backups.remove(backup_to_delete)
|
|
|
|
current_stage += 1
|
|
update(
|
|
celery,
|
|
"Updating tracked backups",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|
|
state_data["tracked_backups"] = tracked_backups
|
|
with open(autobackup_state_file, "w") as fh:
|
|
jdump(state_data, fh)
|
|
|
|
backup_summary[vm_detail["name"]] = tracked_backups
|
|
|
|
# Handle automount unmount commands
|
|
if config["auto_mount_enabled"]:
|
|
for cmd in config["unmount_cmds"]:
|
|
current_stage += 1
|
|
update(
|
|
celery,
|
|
f"Executing unmount command '{cmd.split()[0]}'",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|
|
|
|
ret = run(
|
|
cmd.split(),
|
|
stdout=PIPE,
|
|
stderr=PIPE,
|
|
)
|
|
|
|
if ret.returncode != 0:
|
|
error_message = f"Failed to execute unmount command '{cmd.split()[0]}': {ret.stderr.decode().strip()}"
|
|
log_err(celery, error_message)
|
|
send_execution_failure_report(
|
|
(celery, current_stage, total_stages),
|
|
config,
|
|
recipients=email_recipients,
|
|
total_time=datetime.now() - autobackup_start_time,
|
|
error=error_message,
|
|
)
|
|
fail(celery, error_message)
|
|
return False
|
|
|
|
autobackup_end_time = datetime.now()
|
|
autobackup_total_time = autobackup_end_time - autobackup_start_time
|
|
|
|
send_execution_summary_report(
|
|
(celery, current_stage, total_stages),
|
|
config,
|
|
recipients=email_recipients,
|
|
total_time=autobackup_total_time,
|
|
summary=backup_summary,
|
|
)
|
|
|
|
current_stage += 1
|
|
return finish(
|
|
celery,
|
|
f"Successfully completed cluster '{config['cluster']}' VM autobackup",
|
|
current=current_stage,
|
|
total=total_stages,
|
|
)
|