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       <url>/2024/03/22/deploy-failed-on-ubuntu-20/</url>
 
-        <content type="html"><![CDATA[]]></content>
+        <content type="html"><![CDATA[<p>AWS EC2 的主機從原本的 Ubuntu 18 升級到 20，但卻遇到無法成功部署的問題。如果你也有相同困擾，不妨參考我的作法試試看吧！</p><span id="more"></span><h2 id="起因">起因</h2><p>某天晚上，在 Teams 上收到主管的訊息說：我好像不小心玩壞測試機了⋯⋯</p><p>隔天仔細一問，原來是因為主管在檢查各個專案的 EC2 主機是否有資安疑慮。<br>然後在主機上要下指令更新套件時，不小心去更新到主機系統，導致主機從原先的 Ubuntu 18 更新到 20 了！<br>但我們也都很納悶為什麼這樣升級完之後，Rails 程式無法順利被啟動，只好開始研究怎麼救活它了。</p><h2 id="過程">過程</h2><p>起初，我們發現原因似乎是主機上的 Puma server 沒有順利運作啟用。<br>因此我們嘗試透過 Capistrano 重新部署程式，想看能不能藉此重新啟用它。<br>但經過幾次嘗試都失敗，只好再想看看其他解法。</p><p>接著主管想到，如果複製其他台主機來作為新的主機環境來讓我們能重新部署程式，應該可以吧？<br>我們測試環境的主機配置為：</p><ol><li>一台主機 (A) 處理網頁連線</li><li>兩台主機 (B、C) 處理 Sidekiq 排程</li></ol><p>由於被玩壞掉的是 A 主機，所以主管幫忙複製 B 主機產生出 D 主機。<br>不過我猜測這樣複製出來的 D 主機配置，會與原先 A 主機的不同，進而導致部署可能失敗。<br>經過測試後，的確重新部署到 D 主機的環境也仍然失敗，看來還是先暫停採用這個解法好了。</p><p>就在下午休息放空的時候突然想到，這類型的問題應該不會只有我們遇到過才對吧？<br>會不會網路上有不少求救文章能幫助我解決 A 主機無法順利連線的問題？</p><p>產生這樣的想法後，便開始在 Stack Overflow 上爬文。<br>一查才發現，的確有人遇過這類型的問題<sup class="footnote-ref"><a href="#fn1" id="fnref1">[1]</a></sup>，雖然提問者不是用 Ruby 環境而是 Python。<br>但看了文章內容後覺得挺有參考價值的，不妨試試看文章中的正解⋯⋯</p><p>咦？！居然成功了！🥳</p><h2 id="總結">總結</h2><p>文章中的答案提到因為升級成 Ubuntu 20 時，系統的內建套件 <code>libffi6</code> 也一併升級成 <code>libffi7</code> ，但原本安裝的 Python 設定仍然是會去找 <code>libffi6</code>。</p><p>所以綜合大家所回覆的解法，建議將 Python 重新安裝一次，讓它能去吃到系統中新的 <code>libffi7</code> 就沒問題。<br>同理，我們也只要重新安裝 Ruby 即可！</p><h2 id="參考資料">參考資料</h2><hr class="footnotes-sep"><section class="footnotes"><ol class="footnotes-list"><li id="fn1" class="footnote-item"><p><a href="https://stackoverflow.com/questions/61875869/ubuntu-20-04-upgrade-python-missing-libffi-so-6">Ubuntu 20.04 upgrade, Python missing libffi.so.6</a> <a href="#fnref1" class="footnote-backref">↩︎</a></p></li></ol></section>]]></content>
 
 
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