https://blog.ohtly.com/tags/systemd/ Recent content in Systemd on OHTLY Blog Hugo zh-cn Tue, 23 Jun 2026 22:29:46 +0800 https://blog.ohtly.com/posts/2026-06-23-netbird-watchdog/ Tue, 23 Jun 2026 22:29:46 +0800 https://blog.ohtly.com/posts/2026-06-23-netbird-watchdog/ <p>NetBird 客户端运行中偶遇 management server 不稳定时会断开连接，且不会自动恢复。需要手动 <code>netbird down &amp;&amp; netbird up</code> 才能重连。</p> <h2 id="问题特征"> 问题特征 <a class="heading-link" href="#%e9%97%ae%e9%a2%98%e7%89%b9%e5%be%81"> <i class="fa-solid fa-link" aria-hidden="true" title="链接到标题"></i> <span class="sr-only">链接到标题</span> </a> </h2> <p>日志如下：</p> <pre tabindex="0"><code>WARN management/client/grpc.go: job stream disconnected, will retry silently. Reason: unexpected HTTP status code received from server: 504 (Gateway Timeout) ERRO management/client/grpc.go: stream receive error INFO engine.go: stopped Netbird Engine INFO server.go: service is down </code></pre><p>daemon 进程存活，但内部引擎已永久退出。只有手动重连才能恢复。</p> <h2 id="原因"> 原因 <a class="heading-link" href="#%e5%8e%9f%e5%9b%a0"> <i class="fa-solid fa-link" aria-hidden="true" title="链接到标题"></i> <span class="sr-only">链接到标题</span> </a> </h2> <p>NetBird 客户端内部有一个 backoff 重试循环：</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-go" data-lang="go"><span style="display:flex;"><span><span style="color:#75715e">// 简化示意</span> </span></span><span style="display:flex;"><span><span style="color:#a6e22e">backoff</span>.<span style="color:#a6e22e">Retry</span>(<span style="color:#66d9ef">func</span>() <span style="color:#66d9ef">error</span> { </span></span><span style="display:flex;"><span> <span style="color:#66d9ef">return</span> <span style="color:#a6e22e">s</span>.<span style="color:#a6e22e">connect</span>(<span style="color:#a6e22e">ctx</span>, <span style="color:#f92672">...</span>) </span></span><span style="display:flex;"><span>}, <span style="color:#a6e22e">backOff</span>) </span></span></code></pre></div><p>重试耗尽后 <code>giveUpChan</code> 关闭，引擎永久退出。此后即使网络恢复，客户端也不会再次尝试连接。</p>