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Edit File : plugin_sysctl.py \| Size : 6.74 KB
import re from . import base from .decorators import * import tuned.logs from subprocess import * from tuned.utils.commands import commands import tuned.consts as consts import errno import os log = tuned.logs.get() DEPRECATED_SYSCTL_OPTIONS = [ "base_reachable_time", "retrans_time" ] SYSCTL_CONFIG_DIRS = [ "/run/sysctl.d", "/etc/sysctl.d" ] class SysctlPlugin(base.Plugin): """ `sysctl`:: Sets various kernel parameters at runtime. + This plug-in is used for applying custom `sysctl` settings and should only be used to change system settings that are not covered by other TuneD plug-ins. If the settings are covered by other TuneD plug-ins, use those plug-ins instead. + The syntax for this plug-in is `_key_=_value_`, where `_key_` is the same as the key name provided by the `sysctl` utility. + .Adjusting the kernel runtime kernel.sched_min_granularity_ns value ==== ---- [sysctl] kernel.sched_min_granularity_ns=3000000 ---- ==== """ def __init__(self, args, kwargs): super(SysctlPlugin, self).__init__(args, **kwargs) self._has_dynamic_options = True self._cmd = commands() def _instance_init(self, instance): instance._has_dynamic_tuning = False instance._has_static_tuning = True # FIXME: do we want to do this here? # recover original values in case of crash storage_key = self._storage_key(instance.name) instance._sysctl_original = self._storage.get(storage_key, {}) if len(instance._sysctl_original) > 0: log.info("recovering old sysctl settings from previous run") self._instance_unapply_static(instance) instance._sysctl_original = {} self._storage.unset(storage_key) instance._sysctl = instance.options def _instance_cleanup(self, instance): storage_key = self._storage_key(instance.name) self._storage.unset(storage_key) def _instance_apply_static(self, instance): for option, value in list(instance._sysctl.items()): original_value = self._read_sysctl(option) if original_value is None: log.error("sysctl option %s will not be set, failed to read the original value." % option) else: new_value = self._variables.expand( self._cmd.unquote(value)) new_value = self._process_assignment_modifiers( new_value, original_value) if new_value is not None: instance._sysctl_original[option] = original_value self._write_sysctl(option, new_value) storage_key = self._storage_key(instance.name) self._storage.set(storage_key, instance._sysctl_original) if self._global_cfg.get_bool(consts.CFG_REAPPLY_SYSCTL, consts.CFG_DEF_REAPPLY_SYSCTL): log.info("reapplying system sysctl") self._apply_system_sysctl(instance._sysctl) def _instance_verify_static(self, instance, ignore_missing, devices): ret = True # override, so always skip missing ignore_missing = True for option, value in list(instance._sysctl.items()): curr_val = self._read_sysctl(option) value = self._process_assignment_modifiers(self._variables.expand(value), curr_val) if value is not None: if self._verify_value(option, self._cmd.remove_ws(value), self._cmd.remove_ws(curr_val), ignore_missing) == False: ret = False return ret def _instance_unapply_static(self, instance, rollback = consts.ROLLBACK_SOFT): for option, value in list(instance._sysctl_original.items()): self._write_sysctl(option, value) def _apply_system_sysctl(self, instance_sysctl): files = {} for d in SYSCTL_CONFIG_DIRS: try: flist = os.listdir(d) except OSError: continue for fname in flist: if not fname.endswith(".conf"): continue if fname not in files: files[fname] = d for fname in sorted(files.keys()): d = files[fname] path = "%s/%s" % (d, fname) self._apply_sysctl_config_file(path, instance_sysctl) self._apply_sysctl_config_file("/etc/sysctl.conf", instance_sysctl) def _apply_sysctl_config_file(self, path, instance_sysctl): log.debug("Applying sysctl settings from file %s" % path) try: with open(path, "r") as f: for lineno, line in enumerate(f, 1): self._apply_sysctl_config_line(path, lineno, line, instance_sysctl) log.debug("Finished applying sysctl settings from file %s" % path) except (OSError, IOError) as e: if e.errno != errno.ENOENT: log.error("Error reading sysctl settings from file %s: %s" % (path, str(e))) def _apply_sysctl_config_line(self, path, lineno, line, instance_sysctl): line = line.strip() if len(line) == 0 or line[0] == "#" or line[0] == ";": return tmp = line.split("=", 1) if len(tmp) != 2: log.error("Syntax error in file %s, line %d" % (path, lineno)) return option, value = tmp option = option.strip() if len(option) == 0: log.error("Syntax error in file %s, line %d" % (path, lineno)) return value = value.strip() if option in instance_sysctl: instance_value = self._variables.expand(instance_sysctl[option]) if instance_value != value: log.info("Overriding sysctl parameter '%s' from '%s' to '%s'" % (option, instance_value, value)) self._write_sysctl(option, value, ignore_missing = True) def _get_sysctl_path(self, option): # The sysctl name in sysctl tool and in /proc/sys differs. # All dots (.) in sysctl name are represented by /proc/sys # directories and all slashes in the name (/) are converted # to dots (.) in the /proc/sys filenames. return "/proc/sys/%s" % self._cmd.tr(option, "./", "/.") def _read_sysctl(self, option): path = self._get_sysctl_path(option) try: with open(path, "r") as f: line = "" for i, line in enumerate(f): if i > 0: log.error("Failed to read sysctl parameter '%s', multi-line values are unsupported" % option) return None value = line.strip() log.debug("Value of sysctl parameter '%s' is '%s'" % (option, value)) return value except (OSError, IOError) as e: if e.errno == errno.ENOENT: log.error("Failed to read sysctl parameter '%s', the parameter does not exist" % option) else: log.error("Failed to read sysctl parameter '%s': %s" % (option, str(e))) return None def _write_sysctl(self, option, value, ignore_missing = False): path = self._get_sysctl_path(option) if os.path.basename(path) in DEPRECATED_SYSCTL_OPTIONS: log.error("Refusing to set deprecated sysctl option %s" % option) return False try: log.debug("Setting sysctl parameter '%s' to '%s'" % (option, value)) with open(path, "w") as f: f.write(value) return True except (OSError, IOError) as e: if e.errno == errno.ENOENT: log_func = log.debug if ignore_missing else log.error log_func("Failed to set sysctl parameter '%s' to '%s', the parameter does not exist" % (option, value)) else: log.error("Failed to set sysctl parameter '%s' to '%s': %s" % (option, value, str(e))) return False Back

Edit File : plugin_sysctl.py | Size : 6.74 KB

import re
from . import base
from .decorators import *
import tuned.logs
from subprocess import *
from tuned.utils.commands import commands
import tuned.consts as consts
import errno
import os

log = tuned.logs.get()

DEPRECATED_SYSCTL_OPTIONS = [ "base_reachable_time", "retrans_time" ]
SYSCTL_CONFIG_DIRS = [ "/run/sysctl.d",
		"/etc/sysctl.d" ]

class SysctlPlugin(base.Plugin):
	"""
	`sysctl`::
	
	Sets various kernel parameters at runtime.
	+
	This plug-in is used for applying custom `sysctl` settings and should
	only be used to change system settings that are not covered by other
	*TuneD* plug-ins. If the settings are covered by other *TuneD* plug-ins,
	use those plug-ins instead.
	+
	The syntax for this plug-in is
	`_key_=_value_`, where
	`_key_` is the same as the key name provided by the
	`sysctl` utility.
	+
	.Adjusting the kernel runtime kernel.sched_min_granularity_ns value
	====
	----
	[sysctl]
	kernel.sched_min_granularity_ns=3000000
	----
	====
	"""

def __init__(self, *args, **kwargs):
		super(SysctlPlugin, self).__init__(*args, **kwargs)
		self._has_dynamic_options = True
		self._cmd = commands()

def _instance_init(self, instance):
		instance._has_dynamic_tuning = False
		instance._has_static_tuning = True

# FIXME: do we want to do this here?
		# recover original values in case of crash
		storage_key = self._storage_key(instance.name)
		instance._sysctl_original = self._storage.get(storage_key, {})
		if len(instance._sysctl_original) > 0:
			log.info("recovering old sysctl settings from previous run")
			self._instance_unapply_static(instance)
			instance._sysctl_original = {}
			self._storage.unset(storage_key)

instance._sysctl = instance.options

def _instance_cleanup(self, instance):
		storage_key = self._storage_key(instance.name)
		self._storage.unset(storage_key)

def _instance_apply_static(self, instance):
		for option, value in list(instance._sysctl.items()):
			original_value = self._read_sysctl(option)
			if original_value is None:
				log.error("sysctl option %s will not be set, failed to read the original value."
						% option)
			else:
				new_value = self._variables.expand(
						self._cmd.unquote(value))
				new_value = self._process_assignment_modifiers(
						new_value, original_value)
				if new_value is not None:
					instance._sysctl_original[option] = original_value
					self._write_sysctl(option, new_value)

storage_key = self._storage_key(instance.name)
		self._storage.set(storage_key, instance._sysctl_original)

if self._global_cfg.get_bool(consts.CFG_REAPPLY_SYSCTL, consts.CFG_DEF_REAPPLY_SYSCTL):
			log.info("reapplying system sysctl")
			self._apply_system_sysctl(instance._sysctl)

def _instance_verify_static(self, instance, ignore_missing, devices):
		ret = True
		# override, so always skip missing
		ignore_missing = True
		for option, value in list(instance._sysctl.items()):
			curr_val = self._read_sysctl(option)
			value = self._process_assignment_modifiers(self._variables.expand(value), curr_val)
			if value is not None:
				if self._verify_value(option, self._cmd.remove_ws(value), self._cmd.remove_ws(curr_val), ignore_missing) == False:
					ret = False
		return ret

def _instance_unapply_static(self, instance, rollback = consts.ROLLBACK_SOFT):
		for option, value in list(instance._sysctl_original.items()):
			self._write_sysctl(option, value)

def _apply_system_sysctl(self, instance_sysctl):
		files = {}
		for d in SYSCTL_CONFIG_DIRS:
			try:
				flist = os.listdir(d)
			except OSError:
				continue
			for fname in flist:
				if not fname.endswith(".conf"):
					continue
				if fname not in files:
					files[fname] = d

for fname in sorted(files.keys()):
			d = files[fname]
			path = "%s/%s" % (d, fname)
			self._apply_sysctl_config_file(path, instance_sysctl)
		self._apply_sysctl_config_file("/etc/sysctl.conf", instance_sysctl)

def _apply_sysctl_config_file(self, path, instance_sysctl):
		log.debug("Applying sysctl settings from file %s" % path)
		try:
			with open(path, "r") as f:
				for lineno, line in enumerate(f, 1):
					self._apply_sysctl_config_line(path, lineno, line, instance_sysctl)
			log.debug("Finished applying sysctl settings from file %s"
					% path)
		except (OSError, IOError) as e:
			if e.errno != errno.ENOENT:
				log.error("Error reading sysctl settings from file %s: %s"
						% (path, str(e)))

def _apply_sysctl_config_line(self, path, lineno, line, instance_sysctl):
		line = line.strip()
		if len(line) == 0 or line[0] == "#" or line[0] == ";":
			return
		tmp = line.split("=", 1)
		if len(tmp) != 2:
			log.error("Syntax error in file %s, line %d"
					% (path, lineno))
			return
		option, value = tmp
		option = option.strip()
		if len(option) == 0:
			log.error("Syntax error in file %s, line %d"
					% (path, lineno))
			return
		value = value.strip()
		if option in instance_sysctl:
			instance_value = self._variables.expand(instance_sysctl[option])
			if instance_value != value:
				log.info("Overriding sysctl parameter '%s' from '%s' to '%s'"
						% (option, instance_value, value))
		self._write_sysctl(option, value, ignore_missing = True)

def _get_sysctl_path(self, option):
		# The sysctl name in sysctl tool and in /proc/sys differs.
		# All dots (.) in sysctl name are represented by /proc/sys
		# directories and all slashes in the name (/) are converted
		# to dots (.) in the /proc/sys filenames.
		return "/proc/sys/%s" % self._cmd.tr(option, "./", "/.")

def _read_sysctl(self, option):
		path = self._get_sysctl_path(option)
		try:
			with open(path, "r") as f:
				line = ""
				for i, line in enumerate(f):
					if i > 0:
						log.error("Failed to read sysctl parameter '%s', multi-line values are unsupported"
								% option)
						return None
				value = line.strip()
			log.debug("Value of sysctl parameter '%s' is '%s'"
					% (option, value))
			return value
		except (OSError, IOError) as e:
			if e.errno == errno.ENOENT:
				log.error("Failed to read sysctl parameter '%s', the parameter does not exist"
						% option)
			else:
				log.error("Failed to read sysctl parameter '%s': %s"
						% (option, str(e)))
			return None

def _write_sysctl(self, option, value, ignore_missing = False):
		path = self._get_sysctl_path(option)
		if os.path.basename(path) in DEPRECATED_SYSCTL_OPTIONS:
			log.error("Refusing to set deprecated sysctl option %s"
					% option)
			return False
		try:
			log.debug("Setting sysctl parameter '%s' to '%s'"
					% (option, value))
			with open(path, "w") as f:
				f.write(value)
			return True
		except (OSError, IOError) as e:
			if e.errno == errno.ENOENT:
				log_func = log.debug if ignore_missing else log.error
				log_func("Failed to set sysctl parameter '%s' to '%s', the parameter does not exist"
						% (option, value))
			else:
				log.error("Failed to set sysctl parameter '%s' to '%s': %s"
						% (option, value, str(e)))
			return False

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