Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

问题:Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

docker解决docker与守护进程间的通讯问题cannot connect :cannot connect to the Docker daemon at unix:///var/run/docker.sock
sudo chown *your-username* /var/run/docker.sock

dp@dp1:~$ service docker start
Job for docker.service failed because the control process exited with error code.
See "systemctl status docker.service" and "journalctl -xe" for details.

dp@dp1:~$ sudo docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.5.1-docker)

Server:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
errors pretty printing info

solution:

 sudo snap install docker

dp@dp1:~$ sudo docker version
Client: Docker Engine - Community
 Version:           20.10.3
 API version:       1.40
 Go version:        go1.13.15
 Git commit:        48d30b5
 Built:             Fri Jan 29 14:33:13 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server:
 Engine:
  Version:          19.03.13
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       bd33bbf
  Built:            Fri Feb  5 15:58:24 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v1.3.7
  GitCommit:        8fba4e9a7d01810a393d5d25a3621dc101981175
 runc:
  Version:          1.0.0-rc10
  GitCommit:        
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

dp@dp1:~$ sudo docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.5.1-docker)

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 19.03.13
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 8fba4e9a7d01810a393d5d25a3621dc101981175
 runc version: 
 init version: fec3683
 Security Options:
  apparmor
  seccomp
   Profile: default
 Kernel Version: 5.4.0-65-generic
 Operating System: Ubuntu Core 18
 OSType: linux
 Architecture: x86_64
 CPUs: 24
 Total Memory: 125.5GiB
 Name: dp1
 ID: ERC7:JCMW:P5CY:BI5L:R7Y4:6LIU:UDVG:WTGX:FJK5:H64O:TPGB:A5N4
 Docker Root Dir: /var/snap/docker/common/var-lib-docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: No swap limit support