The network is abnormal, please check the backend service and try again 大疆上云(cloud_api_sample)解决方法

1.查看docker实例中 6789端口是否存在，如果不存在，说明后端编译报错或者其他错误

root@iZ7xvdyqqdbfwvpbikooq8Z:~/workspace/cloud_api_sample# docker ps
CONTAINER ID   IMAGE                         COMMAND                  CREATED         STATUS                          PORTS                                                                                                                                                                                                                                                             NAMES
47c55c0d8e1f   dji/cloud_api_sample:latest   "sh -c 'java -jar /a…"   8 minutes ago   Restarting (1) 31 seconds ago                                                                                                                                                                                                                                                                     cloud_api_sample-cloud_api_sample-1
3ca779e9ec58   redis:6.2                     "docker-entrypoint.s…"   8 minutes ago   Up 8 minutes                    0.0.0.0:6379->6379/tcp, :::6379->6379/tcp                                                                                                                                                                                                                         cloud_api_sample-redis-1
c0bf1e43359e   emqx:4.4                      "/usr/bin/docker-ent…"   8 minutes ago   Up 8 minutes                    4369-4370/tcp, 5369/tcp, 6369-6370/tcp, 0.0.0.0:1883->1883/tcp, :::1883->1883/tcp, 0.0.0.0:8083-8084->8083-8084/tcp, :::8083-8084->8083-8084/tcp, 8081/tcp, 0.0.0.0:8883->8883/tcp, :::8883->8883/tcp, 0.0.0.0:18083->18083/tcp, :::18083->18083/tcp, 11883/tcp   cloud_api_sample-emqx-1
386f62f431c4   dji/nginx:latest              "/docker-entrypoint.…"   8 minutes ago   Up 8 minutes                    80/tcp, 0.0.0.0:8080->8080/tcp, :::8080->8080/tcp                                                                                                                                                                                                                 cloud_api_sample-nginx-1
71bed1699536   dji/mysql:latest              "docker-entrypoint.s…"   8 minutes ago   Up 8 minutes                    0.0.0.0:3306->3306/tcp, :::3306->3306/tcp, 33060/tcp                                                                                                                                                                                                              cloud_api_sample-mysql-1

2.测试6789端口。  

telnet  yourIP 6789  

root@iZ7xvdyqqdbfwvpbikooq8Z:~/workspace/cloud_api_sample# telnet 8.134.218.37 6789
Trying 8.134.218.37...
telnet: Unable to connect to remote host: Connection refused

3.重启服务器和docker，发现几十秒之后，发现后端同样死掉

sudo docker-compose down

systemctl restart docker

reboot

 # 构建前端镜像
 ./update_front.sh
 
 # 构建后端镜像
 ./update_backend.sh

 # 启动docker
sudo docker compose up -d

后端仍然1分钟就崩溃了。删除源码，重新解压

root@iZ7xvdyqqdbfwvpbikooq8Z:~/workspace/cloud_api_sample# ls
cloud_api_sample_docker_v1.10.0.tar  data  docker-compose.yml  source  update_backend.sh  update_front.sh
root@iZ7xvdyqqdbfwvpbikooq8Z:~/workspace/cloud_api_sample# sudo docker load < cloud_api_sample_docker_v1.10.0.tar 
Loaded image: openjdk:11.0.14.1-jdk-buster
Loaded image: dji/mysql:latest
Loaded image: emqx:4.4
Loaded image: redis:6.2
Loaded image: node:17.8-buster
Loaded image: nginx:stable

小心谨慎，不用tab键，只用空格。调整好参数后，就正常启动了

如果正常运行2天点击登陆没有反应。重启也报错：那么

sudo systemctl stop docker  

systemctl restart docker

service docker start 

reboot重启了

root@iZ7xvdyqqdbfwvpbikooq8Z:~/workspace/cloud_api_sample# docker ps
CONTAINER ID   IMAGE                         COMMAND                  CREATED         STATUS          PORTS                                       NAMES
2aa41d163544   dji/cloud_api_sample:latest   "sh -c 'java -jar /a…"   6 minutes ago   Up 9 seconds    0.0.0.0:6789->6789/tcp, :::6789->6789/tcp   cloud_api_sample_cloud_api_sample_1
7a653ececa2d   redis:6.2                     "docker-entrypoint.s…"   6 minutes ago   Up 25 seconds   0.0.0.0:6379->6379/tcp, :::6379->6379/tcp   cloud_api_sample_redis_1
root@iZ7xvdyqqdbfwvpbikooq8Z:~/workspace/cloud_api_sample# sudo docker compose down
WARN[0000] /root/workspace/cloud_api_sample/docker-compose.yml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion 

重启也没有用，检查端口

zk@zk-jf:/mnt/Dji_docker/cloud_api_sample_docker/cloud_api_sample$ sudo netstat -ap | grep 6789
zk@zk-jf:/mnt/Dji_docker/cloud_api_sample_docker/cloud_api_sample$ sudo netstat -ap | grep 18083
unix  2      [ ACC ]     流        LISTENING     18083    1972/systemd         /run/user/1000/gcr/ssh
zk@zk-jf:/mnt/Dji_docker/cloud_api_sample_docker/cloud_api_sample$ sudo netstat -ap | grep 1883
unix  3      [ ]         流        已连接     11883    2027/pipewire-pulse  

解决办法是：！！！！

删除 cloud_api_sample/data/mysql 目录下的所有文件，重启docker

sudo rm -rf mysql/

sudo docker compose up -d

就能正常使用了

所以要真正关闭 docker 服务，要执行如下 2 个命令
# 关闭 docker.socket 服务
  systemctl stop docker.socket
# 关闭 docker.service 服务
  systemctl stop docker.service
然后重新启动docker服务
sudo systemctl start docker  
systemctl start docker.service