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<h1 id="faq">常见问题 (FAQ)</h1>
<h3 id="q1-docker-command-not-found">Q1: 安装脚本提示 "Docker command not found"？</h3>
<p><strong>A</strong>: 请确保您的系统已安装 Docker 和 Docker Compose。
- Ubuntu/Debian 安装 Docker: <code>curl -fsSL https://get.docker.com | bash</code></p>
<h3 id="q2-connection-refused">Q2: 面板无法访问 (Connection Refused)？</h3>
<p><strong>A</strong>:
1. 检查防火墙是否放行了前端端口（默认 <code>6366</code>）。
2. 检查容器是否正常运行: <code>docker ps</code>。
3. 查看容器日志: <code>docker logs flux-panel-backend</code> 或 <code>docker logs vite-frontend</code>。</p>
<h3 id="q3">Q3: 节点显示离线？</h3>
<p><strong>A</strong>:
1. 检查节点服务器与面板服务器之间的网络连通性。
2. 确认在节点端安装时输入的 <strong>面板地址</strong> 和 <strong>密钥</strong> 是否正确。
3. 检查节点端服务状态: <code>systemctl status flux_agent</code>。
4. 查看节点端日志: <code>journalctl -u flux_agent -f</code>。</p>
<h3 id="q4-tcp-udp">Q4: 只有 TCP 能通，UDP 不通？</h3>
<p><strong>A</strong>: 请检查服务器防火墙和安全组（AWS/阿里云/腾讯云等）是否同时放行了对应端口的 <strong>TCP 和 UDP</strong> 协议。</p>
<h3 id="q5-ipv6">Q5: IPv6 无法使用？</h3>
<p><strong>A</strong>: 面板安装脚本会自动尝试配置 Docker 的 IPv6。如果失败，请手动检查 <code>/etc/docker/daemon.json</code> 配置，确保 <code>ipv6: true</code> 且分配了正确的 <code>fixed-cidr-v6</code> 子网。</p>
<h3 id="q6-postgresql">Q6: 如何切换到 PostgreSQL？</h3>
<p><strong>A</strong>: 在 <code>.env</code> 文件中设置 <code>DB_TYPE=postgres</code>，并让 <code>DATABASE_URL</code> 与 <code>POSTGRES_*</code> 保持一致，然后执行 <code>docker compose up -d</code> 重启服务即可。使用安装脚本部署时，<code>POSTGRES_PASSWORD</code> 会自动随机生成并写入 <code>.env</code>。详见 <a href="../postgresql/">PostgreSQL 数据库指南</a>。</p>
<h3 id="q7-sqlite-postgresql">Q7: 从 SQLite 迁移到 PostgreSQL 后数据丢失？</h3>
<p><strong>A</strong>:
1. 确认迁移前已备份 SQLite 文件（<code>gost.db.bak</code>）。
2. 确认 <code>pgloader</code> 命令执行成功，检查其输出是否有报错。
3. 确认 <code>.env</code> 中 <code>DATABASE_URL</code> 的密码与 <code>POSTGRES_PASSWORD</code> 一致。
4. 详细迁移步骤参考 <a href="../postgresql/">PostgreSQL 数据库指南 - 从 SQLite 迁移</a>。</p>
<h3 id="q8-postgresql">Q8: PostgreSQL 容器启动失败？</h3>
<p><strong>A</strong>:
1. 检查 <code>POSTGRES_PASSWORD</code> 是否已设置（不能为空）。
2. 查看容器日志：<code>docker logs flux-panel-postgres</code>。
3. 如果是首次启动后修改了密码，需要删除旧的数据卷重新初始化：<code>docker volume rm postgres_data</code>。</p>
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