我发现 DolphinDB 现在支持使用 docker 容器进行快速集群部署，我按照 github 上的指南：https ://github.com/dolphindb/Tutorials_CN/blob/master/docker_deployment.md使用 DolphinDB Docker 包部署集群。但是我遇到了一个问题。我查看了任何其他问题，但找不到自己的解决方案。
这是问题所在：
xllu@xllu-OptiPlex-7060:~/DolphinDB-Docker-Compose/Dockerbuild$ docker -v
Docker version 18.09.3, build 774a1f4
xllu@xllu-OptiPlex-7060:~/DolphinDB-Docker-Compose/Dockerbuild$ docker-compose --version
docker-compose version 1.24.0, build 0aa59064
xllu@xllu-OptiPlex-7060:~/DolphinDB-Docker-Compose/Dockerbuild$ docker build -t ddb:latest ./
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
我尝试重新启动docker：
xllu@xllu-OptiPlex-7060:~/DolphinDB-Docker-Compose/Dockerbuild$ sudo service docker restart
Job for docker.service failed because the control process exited with error code.
See "systemctl status docker.service" and "journalctl -xe" for details.
然后我检查了这个：
xllu@xllu-OptiPlex-7060:~/DolphinDB-Docker-Compose/Dockerbuild$ systemctl status docker.service
● docker.service - LSB: Create lightweight, portable, self-sufficient containers.
Loaded: loaded (/etc/init.d/docker; generated)
Active: failed (Result: exit-code) since Fri 2019-05-31 15:16:01 CST; 16s ago
Docs: man:systemd-sysv-generator(8)
Process: 29234 ExecStart=/etc/init.d/docker start (code=exited, status=1/FAILURE)
Main PID: 2596 (code=exited, status=0/SUCCESS)
5月 31 15:16:01 xllu-OptiPlex-7060 systemd[1]: Starting LSB: Create lightweight, portable, self-sufficient containers....
5月 31 15:16:01 xllu-OptiPlex-7060 docker[29234]: * /usr/bin/dockerd not present or not executable
5月 31 15:16:01 xllu-OptiPlex-7060 systemd[1]: docker.service: Control process exited, code=exited status=1
5月 31 15:16:01 xllu-OptiPlex-7060 systemd[1]: docker.service: Failed with result 'exit-code'.
5月 31 15:16:01 xllu-OptiPlex-7060 systemd[1]: Failed to start LSB: Create lightweight, portable, self-sufficient containers..