分享一个自动重启 OS X 10.10 上 discoveryd 的脚本

[zhjits]

最近 discoveryd 动不动 CPU 占用 100+，然后一堆应用都访问不了网络，十分难受。写了个脚本自动重启它。

	#!/bin/bash
	# Copyright (c) 2015, James Swineson <[e-mail]>
	#
	# Permission to use, copy, modify, and/or distribute this software for any
	# purpose with or without fee is hereby granted, provided that the above
	# copyright notice and this permission notice appear in all copies.
	#
	# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
	# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
	# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
	# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
	# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
	# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	# PERFORMANCE OF THIS SOFTWARE.
	#
	# Gist URL: https://gist.github.com/Jamesits/f5fb11af7c1b5cdd292b
	# My blog post (in Chinese):
	# http://blog.swineson.me/restart-os-x-10-10-3-buggy-discoveryd-automatically/
	# Check if root
	if [[ $EUID -ne 0 ]]; then
	echo "This script must be run as root" 1>&2
	exit 1
	fi
	# Process max cpu usage arguments
	max_usage=80.0
	re='^[0-9]+([.][0-9]+)?$'
	if [[ $1 =~ $re ]] ; then
	echo "Max allowed CPU usage:" $1
	max_usage=$1
	fi
	# Check real CPU usage
	while true; do
	cpu_usage=$(ps -Aco command,pcpu | grep "discoveryd " | awk '{$1=""; sub(" ", ""); print}')
	if [ "${cpu_usage:-0}" \> $max_usage ] ; then
	echo "Warning: discoveryd CPU Usage at" $cpu_usage ", killing..."
	sudo killall discoveryd
	fi
	sleep 5
	done

view raw discoveryd_checker.sh hosted with ❤ by GitHub

[Totoria]

10.10.3正式版以后没遇到这个问题了。。

[zhjits]

@Totoria 我这边正式版还是有……不知道为什么

[Csineneo]

sudo launchctl unload /System/Library/LaunchDaemons/com.apple.discoveryd.plist
sudo launchctl load /System/Library/LaunchDaemons/com.apple.discoveryd.plist

話說升級到 yosemite 之後只看到人們在說這個問題，還從來沒遇到過，不知道是不是和我用的是本地 dns server 有關

[zhjits]

@Csineneo 这个跟我原理似乎一样。但是还是要不断监视它，过一段时间还是会出问题的。