https://joonlog.github.io/tags/ajp/Recent content in Ajp on JoonlogHugo -- gohugo.ioko-krSat, 07 Jun 2025 09:00:00 +0900https://joonlog.github.io/p/apache-ajp-localhost-%EC%97%B0%EA%B2%B0-%EC%97%90%EB%9F%AC-troubleshooting/Sat, 07 Jun 2025 09:00:00 +0900https://joonlog.github.io/p/apache-ajp-localhost-%EC%97%B0%EA%B2%B0-%EC%97%90%EB%9F%AC-troubleshooting/<h3 id="증상">증상 </h3><ul> <li> <p>웹 접속 시 503 오류 발생</p> </li> <li> <p><code>mod_jk.log</code>에 AJP 연결 실패 로그 다수 출력</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span><span class="lnt">3 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl"><span class="o">[</span>error<span class="o">]</span> ajp_connect_to_endpoint::jk_ajp_common.c <span class="o">(</span>127.0.0.1:8009<span class="o">)</span> <span class="o">(</span><span class="nv">errno</span><span class="o">=</span>111<span class="o">)</span> </span></span><span class="line"><span class="cl"><span class="o">[</span>error<span class="o">]</span> jk_open_socket::jk_connect.c Failed socket to <span class="o">(</span>127.0.0.1:8009<span class="o">)</span> </span></span><span class="line"><span class="cl"><span class="o">[</span>error<span class="o">]</span> ajp_send_request::jk_ajp_common.c <span class="o">(</span>worker1<span class="o">)</span> Connecting to backend failed </span></span></code></pre></td></tr></table> </div> </div></li> <li> <p><code>netstat</code> 기준으로 Tomcat은 AJP 포트(8009)를 정상적으로 Listen 중</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">tcp <span class="m">0</span> <span class="m">0</span> 127.0.0.1:8009 ::1 LISTEN <span class="o">[</span>java 프로세스<span class="o">]</span> </span></span></code></pre></td></tr></table> </div> </div></li> </ul> <h3 id="workersproperties-설정">workers.properties 설정 </h3><ul> <li> <p>기존 설정</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">worker.worker1.type<span class="o">=</span>ajp13 </span></span><span class="line"><span class="cl">worker.worker1.host<span class="o">=</span>localhost </span></span></code></pre></td></tr></table> </div> </div><ul> <li>host가 정상적으로 localhost로 되어 있는데, <code>mod_jk.log</code>에서는 ajp 연동 오류가 나오고, netstat은 IPv6에서만 LISTEN중</li> <li><code>/etc/hosts</code>에도 정상적으로 localhost와 127.0.0.1이 명시된 것으로 확인 <ul> <li>localhost를 127.0.0.1로 변경</li> </ul> </li> </ul> </li> <li> <p>이후 설정</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">worker.worker1.type<span class="o">=</span>ajp13 </span></span><span class="line"><span class="cl">worker.worker1.host<span class="o">=</span>127.0.0.1 </span></span></code></pre></td></tr></table> </div> </div><ul> <li>host 값 변경 후 httpd 재기동 시 503 에러 해결</li> </ul> </li> </ul> <h3 id="결론">결론 </h3><ul> <li>로그를 종합했을 때, Tomcat은 <code>127.0.0.1:8009</code>에서 AJP를 수신하고 있었지만, <code>workers.properties</code>에 설정된 <code>localhost</code>가 내부적으로 <code>::1</code>(IPv6)로 해석되어 연결이 실패한 것으로 추정</li> </ul>