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<title> [筆記] 用pxe 安裝系統，完成後送出郵件通知 / send mail notification after pxe install | MCの飄狂山莊㊣</title>
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<h3><a href="/post/send-mail-to-notify-after-pxe-install/">[筆記] 用pxe 安裝系統，完成後送出郵件通知 / send mail notification after pxe install</a></h3>
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<span class="date moment">2019-07-31</span>
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<a href="/categories/%E7%AD%86%E8%A8%98">筆記</a>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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<p>最近有個任務，需要大量安裝client</p>
<p>想用PXE來處理，只要user開機按F12(acer 桌機) 選擇PXE Boot</p>
<p>然後選擇OS版本，就可以自動進行安裝</p>
<p>安裝完成後，會自動重新開機，接著就用ansible來做user環境設定</p>
<p>PXE的部份本來是沒有什麼問題，自動安裝系統的部份都做好了</p>
<p>可是因為這次的量比較多，想說讓每一台在完成PXE安裝後的第一次重開機</p>
<p>就送出一封郵件來通知我，說已經完成安裝，可以執行ansible 了</p>
<p>看似很簡單的一件事情，卻搞了我兩天&hellip;.</p>
<p></p>
<p>本來在 preseed 檔案中，就有 preseed/late_command 可以用</p>
<p>但是測試了很多遍，才終於找到正確的語法</p>
<pre><code>d-i preseed/late_command \
in-target apt-file update; \
in-target passwd --expire root ;\
in-target /bin/sh -c 'echo &quot;hostname|mail -s pxe_install_complete admin@abc.com&quot; &gt; /etc/rc.local'
</code></pre>
<p>這會把目標主機上的 /etc/rc.local 的內容改成只有一行</p>
<pre><code>hostname|mail -s pxe_install_complete admin@abc.com
</code></pre>
<p>這樣就可以讓主機在完成系統安裝後，第一次重新開機時，送出郵件通知</p>
<p>可是呢，因為ubuntu 開機時，本來就會去執行 /etc/rc.local</p>
<p>所以「每次」開機後，都會送出郵件通知</p>
<p>但是我只想要接到一次通知就好了啊</p>
<p>有文章說可以用 s6-svc 來處理</p>
<p>不過我沒弄懂怎麼用</p>
<p>另一個是用ansible來處理</p>
<p>又或者是，讓這個指令在送出郵件後，「自我還原」或者「自我更新」</p>
<p>自我還原的部份可以這樣做</p>
<pre><code>hostname|mail -s pxe_install_complete admin@abc.com
echo &quot;#!/bin/sh -e\nexit 0&quot; &gt; /etc/rc.local
</code></pre>
<p>所以preseed 那邊的語法就要改一下</p>
<pre><code> in-target /bin/sh -c 'echo &quot;hostname|mail -s pxe_install_complete admin@abc.com;\&quot;exit 0\&quot; &gt; /etc/rc.local'
</code></pre>
<p>這樣一來，在送出郵件後，/etc/rc.local 的檔案內容會被恢復成只有底下這一行</p>
<pre><code>exit 0
</code></pre>
<p>暫時先這樣子處理</p>
<h3 id="更新">更新</h3>
<p>因為直接把 /etc/rc.local 的內容改掉，實在讓我有點不放心</p>
<p>所以想到一個方式，先備份 /etc/rc.local 然後加入我要的功能</p>
<p>因為我只需要它跑一次就好，所以就可以在最後面加入還原剛剛複製的備份檔案</p>
<p>簡單說在preseed 檔案中 改成這樣</p>
<pre><code>d-i preseed/late_command \
in-target apt-file update; \
in-target passwd --expire root ;\
in-target cp /etc/rc.local /etc/rc.local.bak ;\
in-target /bin/sh -c 'echo &quot;hostname|mail -s pxe_install_complete admin@abc.com&quot; &gt; /etc/rc.local' ;\
in-target /bin/sh -c 'echo &quot;cp /etc/rc.local.bak /etc/rc.local&quot; &gt;&gt; /etc/rc.local'
</code></pre>
<p>在開機之後，會先送出郵件通知，然後會把剛剛複製的備份覆蓋回來，變成原本的 rc.local</p>
<p>這樣就不會有什麼問題了</p>
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