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#!/usr/bin/env python2
#
# lxc.hook.pre-start
#
# remounts proxmox container mounts with noatime for performance
#
# copy this file to /usr/share/lxc/hooks/lxc-proxmox-noatime
# create /usr/share/lxc/config/common.conf.d/99-mount-noatime.conf
# with contents: lxc.hook.pre-mount /usr/share/lxc/hooks/lxc-proxmox-noatime
import argparse
import ctypes
import ctypes.util
import os
import platform
import psutil
import sys
import logging
import logging.handlers
from logging.handlers import SysLogHandler
MS_MGC_VAL = 0xc0ed0000 # Magic flag number to indicate "new" flags
MS_NOATIME = 1024
MS_REMOUNT = 32
libc = ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True)
libc.mount.argtypes = (ctypes.c_char_p, ctypes.c_char_p, ctypes.c_char_p, ctypes.c_ulong, ctypes.c_char_p)
rootfs = os.environ['LXC_ROOTFS_PATH']
if 'LXC_NAME' in os.environ:
hostname = os.environ['LXC_NAME']
else:
hostname = platform.node().split('.')[0]
logger = logging.getLogger(os.path.basename(sys.argv[0]))
logger.setLevel(logging.DEBUG)
syslog_handler = SysLogHandler(
address='/dev/log',
facility=SysLogHandler.LOG_DAEMON
)
syslog_handler.setFormatter(
logging.Formatter('%(name)s: vmid={0} %(message)s'.format(hostname))
)
logger.addHandler(syslog_handler)
def parse_arguments():
parser = argparse.ArgumentParser(description='NMI mount pre-start container hooks')
parser.add_argument('vmid',
help='container name', type=str)
parser.add_argument('section',
help='always "lxc"', type=str)
parser.add_argument('type',
help='hook type', type=str)
return parser.parse_args()
def remount_noatime(source, target, fs):
ret = libc.mount(source, target, fs, MS_REMOUNT | MS_NOATIME, '')
if ret < 0:
errno = ctypes.get_errno()
raise OSError(errno, "Error remounting {} with noatime: {}".
format(target, os.strerror(errno)))
if __name__ == '__main__':
try:
args = parse_arguments()
partitions = psutil.disk_partitions()
for p in partitions:
if p.mountpoint.startswith(rootfs):
logger.info('remounting {0} with noatime'.format(p.mountpoint))
remount_noatime(p.device, p.mountpoint, p.fstype)
except Exception:
logger.exception('failed to pre-start mounts')
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