Cannot connect toxxx docker daemon running

Dec 22 14:50:27 master49 kubelet: F1222 14:50:27.123073   30898 server.go:274] failed to run Kubelet: failed to get docker version: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Dec 22 14:50:27 master49 systemd: Unit kubelet.service entered failed state.
Dec 22 14:50:27 master49 systemd: kubelet.service failed.
^C
[root@master49 ~]# docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.5.0-docker)

Server:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
errors pretty printing info
[root@master49 ~]# service docker restart
Redirecting to /bin/systemctl restart docker.service
[root@master49 ~]# docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
[root@master49 ~]# systemctl daemon-reload
[root@master49 ~]# service docker restart
Redirecting to /bin/systemctl restart docker.service
[root@master49 ~]# kubectl get node
NAME       STATUS   ROLES    AGE   VERSION
master49   Ready    master   28h   v1.18.2
master50   Ready    master   28h   v1.18.2
master56   Ready    master   28h   v1.18.2
node52     Ready       28h   v1.18.2
node53     Ready       28h   v1.18.2

我是修改过 /etc/docker/daemon.json 然后改好后出现的问题