openstack/swift
Code Issues Proposed changes
54e13ee9b5
swift/bin/swift-drive-audit
Philippe SERAPHIN 1c210d2e49 Change getting major:minor of blkdev 
Replace method for determine major:minor of block device
because stat can't detect major:minor in some cases.

Change-Id: Idcc7cd7a41e225d1052c03ba846dff02851758f8
2023-06-28 10:35:13 +02:00

260 lines
10 KiB
Python
Executable File
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#!/usr/bin/env python
# Copyright (c) 2010-2012 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import datetime
import glob
import locale
import os
import os.path
import re
import subprocess
import sys
import six
from six.moves.configparser import ConfigParser
from swift.common.utils import backward, get_logger, dump_recon_cache, \
config_true_value
def get_devices(device_dir, logger):
devices = []
majmin_devices = {}
# List /dev/block
# Using os.scandir on recent versions of python, else os.listdir
if 'scandir' in dir(os):
with os.scandir("/dev/block") as it:
for ent in it:
if ent.is_symlink():
dev_name = os.path.basename(os.readlink(ent.path))
majmin = os.path.basename(ent.path).split(':')
majmin_devices[dev_name] = {'major': majmin[0],
'minor': majmin[1]}
else:
for ent in os.listdir("/dev/block"):
ent_path = os.path.join("/dev/block", ent)
if os.path.is_symlink(ent_path):
dev_name = os.path.basename(os.readlink(ent_path))
majmin = os.path.basename(ent_path).split(':')
majmin_devices[dev_name] = {'major': majmin[0],
'minor': majmin[1]}
for line in open('/proc/mounts').readlines():
data = line.strip().split()
block_device = data[0]
mount_point = data[1]
if mount_point.startswith(device_dir):
device = {}
device['mount_point'] = mount_point
device['block_device'] = block_device
dev_name = os.path.basename(block_device)
if dev_name in majmin_devices:
# If symlink is in /dev/block
device['major'] = majmin_devices[dev_name]['major']
device['minor'] = majmin_devices[dev_name]['minor']
else:
# Else we try to stat block_device
try:
device_num = os.stat(block_device).st_rdev
except OSError:
# If we can't stat the device,
# then something weird is going on
logger.error(
'Could not determine major:minor numbers for %s '
'(mounted at %s)! Skipping...',
block_device, mount_point)
continue
device['major'] = str(os.major(device_num))
device['minor'] = str(os.minor(device_num))
devices.append(device)
for line in open('/proc/partitions').readlines()[2:]:
major, minor, blocks, kernel_device = line.strip().split()
device = [d for d in devices
if d['major'] == major and d['minor'] == minor]
if device:
device[0]['kernel_device'] = kernel_device
return devices
def get_errors(error_re, log_file_pattern, minutes, logger,
log_file_encoding):
# Assuming log rotation is being used, we need to examine
# recently rotated files in case the rotation occurred
# just before the script is being run - the data we are
# looking for may have rotated.
#
# The globbing used before would not work with all out-of-box
# distro setup for logrotate and syslog therefore moving this
# to the config where one can set it with the desired
# globbing pattern.
log_files = [f for f in glob.glob(log_file_pattern)]
try:
log_files.sort(key=lambda f: os.stat(f).st_mtime, reverse=True)
except (IOError, OSError) as exc:
logger.error(exc)
print(exc)
sys.exit(1)
now_time = datetime.datetime.now()
end_time = now_time - datetime.timedelta(minutes=minutes)
# kern.log does not contain the year so we need to keep
# track of the year and month in case the year recently
# ticked over
year = now_time.year
prev_ent_month = now_time.strftime('%b')
errors = {}
reached_old_logs = False
for path in log_files:
try:
f = open(path, 'rb')
except IOError:
logger.error("Error: Unable to open " + path)
print("Unable to open " + path)
sys.exit(1)
for line in backward(f):
if not six.PY2:
line = line.decode(log_file_encoding, 'surrogateescape')
if '[ 0.000000]' in line \
or 'KERNEL supported cpus:' in line \
or 'BIOS-provided physical RAM map:' in line:
# Ignore anything before the last boot
reached_old_logs = True
break
# Solves the problem with year change - kern.log does not
# keep track of the year.
log_time_ent = line.split()[:3]
if log_time_ent[0] == 'Dec' and prev_ent_month == 'Jan':
year -= 1
prev_ent_month = log_time_ent[0]
log_time_string = '%d %s' % (year, ' '.join(log_time_ent))
try:
log_time = datetime.datetime.strptime(
log_time_string, '%Y %b %d %H:%M:%S')
except ValueError:
continue
if log_time > end_time:
for err in error_re:
for device in err.findall(line):
errors[device] = errors.get(device, 0) + 1
else:
reached_old_logs = True
break
if reached_old_logs:
break
return errors
def comment_fstab(mount_point):
with open('/etc/fstab', 'r') as fstab:
with open('/etc/fstab.new', 'w') as new_fstab:
for line in fstab:
parts = line.split()
if len(parts) > 2 \
and parts[1] == mount_point \
and not line.startswith('#'):
new_fstab.write('#' + line)
else:
new_fstab.write(line)
os.rename('/etc/fstab.new', '/etc/fstab')
if __name__ == '__main__':
c = ConfigParser()
try:
conf_path = sys.argv[1]
except Exception:
print("Usage: %s CONF_FILE" % sys.argv[0].split('/')[-1])
sys.exit(1)
if not c.read(conf_path):
print("Unable to read config file %s" % conf_path)
sys.exit(1)
conf = dict(c.items('drive-audit'))
device_dir = conf.get('device_dir', '/srv/node')
minutes = int(conf.get('minutes', 60))
error_limit = int(conf.get('error_limit', 1))
recon_cache_path = conf.get('recon_cache_path', "/var/cache/swift")
log_file_pattern = conf.get('log_file_pattern',
'/var/log/kern.*[!.][!g][!z]')
log_file_encoding = conf.get('log_file_encoding', 'auto')
if log_file_encoding == 'auto':
log_file_encoding = locale.getpreferredencoding()
log_to_console = config_true_value(conf.get('log_to_console', False))
error_re = []
for conf_key in conf:
if conf_key.startswith('regex_pattern_'):
error_pattern = conf[conf_key]
try:
r = re.compile(error_pattern)
except re.error:
sys.exit('Error: unable to compile regex pattern "%s"' %
error_pattern)
error_re.append(r)
if not error_re:
error_re = [
re.compile(r'\berror\b.*\b(sd[a-z]{1,2}\d?)\b'),
re.compile(r'\b(sd[a-z]{1,2}\d?)\b.*\berror\b'),
]
conf['log_name'] = conf.get('log_name', 'drive-audit')
logger = get_logger(conf, log_to_console=log_to_console,
log_route='drive-audit')
devices = get_devices(device_dir, logger)
logger.debug("Devices found: %s" % str(devices))
if not devices:
logger.error("Error: No devices found!")
recon_errors = {}
total_errors = 0
for device in devices:
recon_errors[device['mount_point']] = 0
errors = get_errors(error_re, log_file_pattern, minutes, logger,
log_file_encoding)
logger.debug("Errors found: %s" % str(errors))
unmounts = 0
for kernel_device, count in errors.items():
if count >= error_limit:
device = \
[d for d in devices if d['kernel_device'] == kernel_device]
if device:
mount_point = device[0]['mount_point']
if mount_point.startswith(device_dir):
if config_true_value(conf.get('unmount_failed_device',
True)):
logger.info("Unmounting %s with %d errors" %
(mount_point, count))
subprocess.call(['umount', '-fl', mount_point])
logger.info("Commenting out %s from /etc/fstab" %
(mount_point))
comment_fstab(mount_point)
unmounts += 1
else:
logger.info("Detected %s with %d errors "
"(Device not unmounted)" %
(mount_point, count))
recon_errors[mount_point] = count
total_errors += count
recon_file = recon_cache_path + "/drive.recon"
dump_recon_cache(recon_errors, recon_file, logger)
dump_recon_cache({'drive_audit_errors': total_errors}, recon_file, logger,
set_owner=conf.get("user", "swift"))
if unmounts == 0:
logger.info("No drives were unmounted")
elif os.path.isdir("/run/systemd/system"):
logger.debug("fstab updated, calling systemctl daemon-reload")
subprocess.call(["/usr/bin/systemctl", "daemon-reload"])
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