重启服务器后无法连接本地Portainer的问题排查求助

问题背景 #

昨日安装Portainer后可正常使用，夜间关闭服务器，今日重启后无法访问，浏览器提示ERR_CONNECTION_TIMED_OUT。推测问题可能与昨日尝试配置Docker Swarm/Portainer Agent失败有关，怀疑Docker自身配置存在异常。

已执行的排查操作 #

• 删除原有Portainer容器及数据卷：

  sudo docker rm -f portainer
  sudo docker volume rm -f portainer_data
  

• 重新部署Portainer容器：

  sudo docker run -d --privileged -p 9000:9000 --name portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:latest
  

• 开放防火墙端口：

  sudo ufw allow 9000
  

• 测试端口可达性：运行nc -l 9000监听端口后，访问192.168.178.46:9000，nc收到完整HTTP请求：

  GET / HTTP/1.1
  Host: 192.168.178.46:9000
  Connection: keep-alive
  Cache-Control: max-age=0
  Upgrade-Insecure-Requests: 1
  User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
  Accept-Encoding: gzip, deflate
  Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7
  Cookie: _pk_id.1.15bd=2476c3cd963cb84b.1667402782.
  

  可见请求已到达服务器，但Portainer未做出响应。

Portainer日志信息 #

2022/11/03 09:45AM INF github.com/portainer/portainer/api/cmd/portainer/main.go:530 > encryption key file not present | filename=portainer
2022/11/03 09:45AM INF github.com/portainer/portainer/api/cmd/portainer/main.go:549 > proceeding without encryption key |
2022/11/03 09:45AM INF github.com/portainer/portainer/api/database/boltdb/db.go:124 > loading PortainerDB | filename=portainer.db
2022/11/03 09:45AM INF github.com/portainer/portainer/api/internal/ssl/ssl.go:80 > no cert files found, generating self signed SSL certificates |
2022/11/03 09:45:47 server: Reverse tunnelling enabled
2022/11/03 09:45:47 server: Fingerprint cf:97:21:21:46:a0:bf:ef:aa:e0:7c:66:f9:77:86:67
2022/11/03 09:45:47 server: Listening on 0.0.0.0:8000...
2022/11/03 09:45AM INF github.com/portainer/portainer/api/cmd/portainer/main.go:789 > starting Portainer | build_number=24674 go_version=1.18.3 image_tag=linux-amd64-2.16.0 nodejs_version=14.20.1 version=2.16.0 webpack_version=5.68.0 yarn_version=1.22.19
2022/11/03 09:45AM INF github.com/portainer/portainer/api/http/server.go:337 > starting HTTPS server | bind_address=:9443
2022/11/03 09:45AM INF github.com/portainer/portainer/api/http/server.go:322 > starting HTTP server | bind_address=:9000

请求解决方案 #

目前已确认端口可接收请求，但Portainer无响应，日志显示服务已正常启动。求排查和解决该问题的具体方案。

内容的提问来源于stack exchange，提问作者Martin Worzalla