在某个项目中用到了docker，过后一直不需要该环境了，但是在工作中常发现dockerd服务占用cpu 特别高，就想着如何关闭docker服务，不让其开机自启动。

1.查看docker服务是否开机启动
# sudo systemctl list-unit-files | grep enable|grep docker
snap-docker-796.mount                      enabled        
snap.docker.dockerd.service                enabled
 
2.关闭docker开机自启动
# systemctl disable snap.docker.dockerd.service
Removed /etc/systemd/system/multi-user.target.wants/snap.docker.dockerd.service.
 
3.开启docker开机自启动
# systemctl enable snap.docker.dockerd.service
 
4.关闭docker服务
# systemctl stop snap.docker.dockerd.service
 
5.启动docker服务
# systemctl start snap.docker.dockerd.service
 
6.查看docker服务是否启动
# sudo systemctl list-units --type=service|grep docker
snap.docker.dockerd.service  loaded active  running  Service for snap application docker.dockerd

7 关闭和开启docker
# sudo service docker start
# sudo service docker stop