自动重启 OS X 10.10.3 上问题多多的 discoveryd

众所周知，OS X 10.10.3 问题多多，其中用来取代 mDNSResponder 的 discoveryd 常常出现 CPU 占用过高，无法正常工作的情况。

下面有一段简单的 Shell 脚本用以循环检查 discoveryd 是否出现问题，并自动重启它。需要管理员权限启动，可选的第一个参数是限制的最高 CPU 使用率（默认 80）。

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            <span class="author"><a data-hovercard-type="user" data-hovercard-url="/users/Jamesits/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/Jamesits">Jamesits</a></span><!--
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    Check if discoveryd on OS X 10.10.3 has too high CPU usage and restart it. 
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  <table data-hpc class="highlight tab-size js-file-line-container" data-tab-size="8" data-paste-markdown-skip data-tagsearch-path="discoveryd_checker.sh">
        <tr>
          <td id="file-discoveryd_checker-sh-L1" class="blob-num js-line-number js-blob-rnum" data-line-number="1"></td>
          <td id="file-discoveryd_checker-sh-LC1" class="blob-code blob-code-inner js-file-line">#!/bin/bash</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L2" class="blob-num js-line-number js-blob-rnum" data-line-number="2"></td>
          <td id="file-discoveryd_checker-sh-LC2" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L3" class="blob-num js-line-number js-blob-rnum" data-line-number="3"></td>
          <td id="file-discoveryd_checker-sh-LC3" class="blob-code blob-code-inner js-file-line"># Copyright (c) 2015, James Swineson <jamesswineson@gmail.com></td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L4" class="blob-num js-line-number js-blob-rnum" data-line-number="4"></td>
          <td id="file-discoveryd_checker-sh-LC4" class="blob-code blob-code-inner js-file-line"># </td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L5" class="blob-num js-line-number js-blob-rnum" data-line-number="5"></td>
          <td id="file-discoveryd_checker-sh-LC5" class="blob-code blob-code-inner js-file-line"># Permission to use, copy, modify, and/or distribute this software for any</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L6" class="blob-num js-line-number js-blob-rnum" data-line-number="6"></td>
          <td id="file-discoveryd_checker-sh-LC6" class="blob-code blob-code-inner js-file-line"># purpose with or without fee is hereby granted, provided that the above</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L7" class="blob-num js-line-number js-blob-rnum" data-line-number="7"></td>
          <td id="file-discoveryd_checker-sh-LC7" class="blob-code blob-code-inner js-file-line"># copyright notice and this permission notice appear in all copies.</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L8" class="blob-num js-line-number js-blob-rnum" data-line-number="8"></td>
          <td id="file-discoveryd_checker-sh-LC8" class="blob-code blob-code-inner js-file-line"># </td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L9" class="blob-num js-line-number js-blob-rnum" data-line-number="9"></td>
          <td id="file-discoveryd_checker-sh-LC9" class="blob-code blob-code-inner js-file-line"># THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L10" class="blob-num js-line-number js-blob-rnum" data-line-number="10"></td>
          <td id="file-discoveryd_checker-sh-LC10" class="blob-code blob-code-inner js-file-line"># REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L11" class="blob-num js-line-number js-blob-rnum" data-line-number="11"></td>
          <td id="file-discoveryd_checker-sh-LC11" class="blob-code blob-code-inner js-file-line"># AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L12" class="blob-num js-line-number js-blob-rnum" data-line-number="12"></td>
          <td id="file-discoveryd_checker-sh-LC12" class="blob-code blob-code-inner js-file-line"># INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L13" class="blob-num js-line-number js-blob-rnum" data-line-number="13"></td>
          <td id="file-discoveryd_checker-sh-LC13" class="blob-code blob-code-inner js-file-line"># LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L14" class="blob-num js-line-number js-blob-rnum" data-line-number="14"></td>
          <td id="file-discoveryd_checker-sh-LC14" class="blob-code blob-code-inner js-file-line"># OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L15" class="blob-num js-line-number js-blob-rnum" data-line-number="15"></td>
          <td id="file-discoveryd_checker-sh-LC15" class="blob-code blob-code-inner js-file-line"># PERFORMANCE OF THIS SOFTWARE.</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L16" class="blob-num js-line-number js-blob-rnum" data-line-number="16"></td>
          <td id="file-discoveryd_checker-sh-LC16" class="blob-code blob-code-inner js-file-line"># </td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L17" class="blob-num js-line-number js-blob-rnum" data-line-number="17"></td>
          <td id="file-discoveryd_checker-sh-LC17" class="blob-code blob-code-inner js-file-line"># Gist URL: https://gist.github.com/Jamesits/f5fb11af7c1b5cdd292b</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L18" class="blob-num js-line-number js-blob-rnum" data-line-number="18"></td>
          <td id="file-discoveryd_checker-sh-LC18" class="blob-code blob-code-inner js-file-line"># My blog post (in Chinese): </td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L19" class="blob-num js-line-number js-blob-rnum" data-line-number="19"></td>
          <td id="file-discoveryd_checker-sh-LC19" class="blob-code blob-code-inner js-file-line"># http://blog.swineson.me/restart-os-x-10-10-3-buggy-discoveryd-automatically/</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L20" class="blob-num js-line-number js-blob-rnum" data-line-number="20"></td>
          <td id="file-discoveryd_checker-sh-LC20" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L21" class="blob-num js-line-number js-blob-rnum" data-line-number="21"></td>
          <td id="file-discoveryd_checker-sh-LC21" class="blob-code blob-code-inner js-file-line"># Check if root</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L22" class="blob-num js-line-number js-blob-rnum" data-line-number="22"></td>
          <td id="file-discoveryd_checker-sh-LC22" class="blob-code blob-code-inner js-file-line">if [[ $EUID -ne 0 ]]; then</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L23" class="blob-num js-line-number js-blob-rnum" data-line-number="23"></td>
          <td id="file-discoveryd_checker-sh-LC23" class="blob-code blob-code-inner js-file-line">   echo "This script must be run as root" 1>&2</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L24" class="blob-num js-line-number js-blob-rnum" data-line-number="24"></td>
          <td id="file-discoveryd_checker-sh-LC24" class="blob-code blob-code-inner js-file-line">   exit 1</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L25" class="blob-num js-line-number js-blob-rnum" data-line-number="25"></td>
          <td id="file-discoveryd_checker-sh-LC25" class="blob-code blob-code-inner js-file-line">fi</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L26" class="blob-num js-line-number js-blob-rnum" data-line-number="26"></td>
          <td id="file-discoveryd_checker-sh-LC26" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L27" class="blob-num js-line-number js-blob-rnum" data-line-number="27"></td>
          <td id="file-discoveryd_checker-sh-LC27" class="blob-code blob-code-inner js-file-line"># Process max cpu usage arguments</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L28" class="blob-num js-line-number js-blob-rnum" data-line-number="28"></td>
          <td id="file-discoveryd_checker-sh-LC28" class="blob-code blob-code-inner js-file-line">max_usage=80.0</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L29" class="blob-num js-line-number js-blob-rnum" data-line-number="29"></td>
          <td id="file-discoveryd_checker-sh-LC29" class="blob-code blob-code-inner js-file-line">re='^[0-9]+([.][0-9]+)?$'</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L30" class="blob-num js-line-number js-blob-rnum" data-line-number="30"></td>
          <td id="file-discoveryd_checker-sh-LC30" class="blob-code blob-code-inner js-file-line">if [[ $1 =~ $re ]] ; then</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L31" class="blob-num js-line-number js-blob-rnum" data-line-number="31"></td>
          <td id="file-discoveryd_checker-sh-LC31" class="blob-code blob-code-inner js-file-line">	echo "Max allowed CPU usage:" $1</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L32" class="blob-num js-line-number js-blob-rnum" data-line-number="32"></td>
          <td id="file-discoveryd_checker-sh-LC32" class="blob-code blob-code-inner js-file-line">	max_usage=$1</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L33" class="blob-num js-line-number js-blob-rnum" data-line-number="33"></td>
          <td id="file-discoveryd_checker-sh-LC33" class="blob-code blob-code-inner js-file-line">fi</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L34" class="blob-num js-line-number js-blob-rnum" data-line-number="34"></td>
          <td id="file-discoveryd_checker-sh-LC34" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L35" class="blob-num js-line-number js-blob-rnum" data-line-number="35"></td>
          <td id="file-discoveryd_checker-sh-LC35" class="blob-code blob-code-inner js-file-line"># Check real CPU usage</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L36" class="blob-num js-line-number js-blob-rnum" data-line-number="36"></td>
          <td id="file-discoveryd_checker-sh-LC36" class="blob-code blob-code-inner js-file-line">while true; do</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L37" class="blob-num js-line-number js-blob-rnum" data-line-number="37"></td>
          <td id="file-discoveryd_checker-sh-LC37" class="blob-code blob-code-inner js-file-line">	cpu_usage=$(ps -Aco command,pcpu | grep "discoveryd " | awk '{$1=""; sub(" ", ""); print}')</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L38" class="blob-num js-line-number js-blob-rnum" data-line-number="38"></td>
          <td id="file-discoveryd_checker-sh-LC38" class="blob-code blob-code-inner js-file-line">	</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L39" class="blob-num js-line-number js-blob-rnum" data-line-number="39"></td>
          <td id="file-discoveryd_checker-sh-LC39" class="blob-code blob-code-inner js-file-line">	if [ "${cpu_usage:-0}" \> $max_usage ] ; then</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L40" class="blob-num js-line-number js-blob-rnum" data-line-number="40"></td>
          <td id="file-discoveryd_checker-sh-LC40" class="blob-code blob-code-inner js-file-line">		echo "Warning: discoveryd CPU Usage at" $cpu_usage ", killing..."</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L41" class="blob-num js-line-number js-blob-rnum" data-line-number="41"></td>
          <td id="file-discoveryd_checker-sh-LC41" class="blob-code blob-code-inner js-file-line">		sudo killall discoveryd</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L42" class="blob-num js-line-number js-blob-rnum" data-line-number="42"></td>
          <td id="file-discoveryd_checker-sh-LC42" class="blob-code blob-code-inner js-file-line">	fi</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L43" class="blob-num js-line-number js-blob-rnum" data-line-number="43"></td>
          <td id="file-discoveryd_checker-sh-LC43" class="blob-code blob-code-inner js-file-line">	</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L44" class="blob-num js-line-number js-blob-rnum" data-line-number="44"></td>
          <td id="file-discoveryd_checker-sh-LC44" class="blob-code blob-code-inner js-file-line">	sleep 5</td>
        </tr>
        <tr>
          <td id="file-discoveryd_checker-sh-L45" class="blob-num js-line-number js-blob-rnum" data-line-number="45"></td>
          <td id="file-discoveryd_checker-sh-LC45" class="blob-code blob-code-inner js-file-line">done</td>
        </tr>
  </table>
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Check if discoveryd on OS X 10.10.3 has too high CPU usage and restart it.

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discoveryd_checker.sh

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<td id="file-discoveryd_checker-sh-LC5" class="blob-code blob-code-inner js-file-line"># Permission to use, copy, modify, and/or distribute this software for any</td>

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<tr>

<td id="file-discoveryd_checker-sh-LC6" class="blob-code blob-code-inner js-file-line"># purpose with or without fee is hereby granted, provided that the above</td>

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<td id="file-discoveryd_checker-sh-LC7" class="blob-code blob-code-inner js-file-line"># copyright notice and this permission notice appear in all copies.</td>

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<td id="file-discoveryd_checker-sh-LC9" class="blob-code blob-code-inner js-file-line"># THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH</td>

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<td id="file-discoveryd_checker-sh-LC10" class="blob-code blob-code-inner js-file-line"># REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY</td>

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<td id="file-discoveryd_checker-sh-LC11" class="blob-code blob-code-inner js-file-line"># AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,</td>

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<td id="file-discoveryd_checker-sh-LC12" class="blob-code blob-code-inner js-file-line"># INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM</td>

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<tr>

<td id="file-discoveryd_checker-sh-LC13" class="blob-code blob-code-inner js-file-line"># LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC14" class="blob-code blob-code-inner js-file-line"># OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR</td>

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<tr>

<td id="file-discoveryd_checker-sh-LC15" class="blob-code blob-code-inner js-file-line"># PERFORMANCE OF THIS SOFTWARE.</td>

</tr>

<tr>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC17" class="blob-code blob-code-inner js-file-line"># Gist URL: https://gist.github.com/Jamesits/f5fb11af7c1b5cdd292b</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC18" class="blob-code blob-code-inner js-file-line"># My blog post (in Chinese): </td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC19" class="blob-code blob-code-inner js-file-line"># http://blog.swineson.me/restart-os-x-10-10-3-buggy-discoveryd-automatically/</td>

</tr>

<tr>

</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC21" class="blob-code blob-code-inner js-file-line"># Check if root</td>

</tr>

<tr>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC23" class="blob-code blob-code-inner js-file-line"> echo "This script must be run as root" 1>&2</td>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC27" class="blob-code blob-code-inner js-file-line"># Process max cpu usage arguments</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC28" class="blob-code blob-code-inner js-file-line">max_usage=80.0</td>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC31" class="blob-code blob-code-inner js-file-line"> echo "Max allowed CPU usage:" $1</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC32" class="blob-code blob-code-inner js-file-line"> max_usage=$1</td>

</tr>

<tr>

</tr>

<tr>

</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC35" class="blob-code blob-code-inner js-file-line"># Check real CPU usage</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC36" class="blob-code blob-code-inner js-file-line">while true; do</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC37" class="blob-code blob-code-inner js-file-line"> cpu_usage=$(ps -Aco command,pcpu | grep "discoveryd " | awk '{$1=""; sub(" ", ""); print}')</td>

</tr>

<tr>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC39" class="blob-code blob-code-inner js-file-line"> if [ "${cpu_usage:-0}" \> $max_usage ] ; then</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC40" class="blob-code blob-code-inner js-file-line"> echo "Warning: discoveryd CPU Usage at" $cpu_usage ", killing..."</td>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC41" class="blob-code blob-code-inner js-file-line"> sudo killall discoveryd</td>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

<td id="file-discoveryd_checker-sh-LC44" class="blob-code blob-code-inner js-file-line"> sleep 5</td>

</tr>

<tr>

</tr>

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class="Link--secondary underline-on-hover border-0 p-0 color-bg-transparent"

data-action="click:cookie-consent-link#showConsentManagement"

data-analytics-event="{"location":"footer","action":"cookies","context":"subfooter","tag":"link","label":"cookies_link_subfooter_footer"}"

Manage cookies

</button>

</cookie-consent-link>

</li>

<cookie-consent-link>

<button

type="button"

class="Link--secondary underline-on-hover border-0 p-0 color-bg-transparent"

data-action="click:cookie-consent-link#showConsentManagement"

data-analytics-event="{"location":"footer","action":"dont_share_info","context":"subfooter","tag":"link","label":"dont_share_info_link_subfooter_footer"}"

Do not share my personal information

</button>

</cookie-consent-link>

</li>

</ul>

</nav>

</div>

</footer>

<ghcc-consent id="ghcc" class="position-fixed bottom-0 left-0" style="z-index: 999999" data-initial-cookie-consent-allowed="" data-cookie-consent-required="true"></ghcc-consent>

</svg>

</svg>

</button>

You can’t perform that action at this time.

</div>

<details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal">

</svg>

</button>

</details-dialog>

</details>

</template>

</div>

<clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w">

</svg>

</svg>

</clipboard-copy>

</div>

</template>

<clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w">

</svg>

</svg>

</clipboard-copy>

</div>

</template>

</div>

</body>

</html>

Github Gist 地址：https://gist.github.com/Jamesits/f5fb11af7c1b5cdd292b

使用方法：

wget https://gist.githubusercontent.com/Jamesits/f5fb11af7c1b5cdd292b/raw/bcf649f14ab7d936dc41efb77325ee16bcb4a428/discoveryd_checker.sh
chmod +x discoveryd_checker.sh
sudo ./discoveryd_checker.sh

wget https://gist.githubusercontent.com/Jamesits/f5fb11af7c1b5cdd292b/raw/bcf649f14ab7d936dc41efb77325ee16bcb4a428/discoveryd_checker.sh

chmod +x discoveryd_checker.sh

sudo ./discoveryd_checker.sh

Drown in Codes

I was sixteen with an open heart…

自动重启 OS X 10.10.3 上问题多多的 discoveryd

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