系統：CentOS Linux release 7.2 (Core) 3.10.0-693.11.6.el7.x86_64
SELinux：關閉
docker版本

# docker --version
Docker version 17.12.0-ce, build c97c6d6

docker images

# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              latest              0458
 
a4468cbc        4 weeks ago         112MB

報錯

# docker rmi 0458a4468cbc
Error response from daemon: conflict: unable to delete 0458a4468cbc (must be forced) - image is being used by stopped co
ntainer a686daa452d9

解決

# docker ps -a |grep "Exited"|awk '{print $1}'|xargs docker stop
394ce6ebb1f1
4206
 
bb0db0db
3e47ff374145
# docker ps -a |grep "Exited"|awk '{print $1}'|xargs docker rm
394ce6ebb1f1
4206bb0db0db
3e47ff374145

重新docker images，成功

# docker rmi 0458a4468cbc
Untagged: ubuntu:latest
Untagged: [email protected]:e27e9d7f7f28d67aa9e2d7540bdc2b33254b452ee8e60f388875e5b7d9b2b696
Deleted: sha256:0458
 
a4468cbceea0c304de953305b059803f67693bad463dcbe7cce2c91ba670
Deleted: sha256:77e6ddba346d8ad1e436256f6373dede5af4002006981b7d4116c561c759cefa
Deleted: sha256:8db758ab2fdb54da0aec53aeac876934337e6170f5a8c8872b3d4171e3d465b7
Deleted: sha256:a7fc6b405fe8ef71edfa6163d1dc9f1cb1df426049eefaa7d388e9df21a061ad
Deleted: sha256:5a3e35538f7f2e2727c8ac92f08c30002b9e8a77737de0dab91244344d59f69b
Deleted: sha256:ff986b10a018b48074e6d3a68b39aad8ccc002cdad912d4148c0f92b3729323e

//報錯現象
# docker run -d -p 5000:5000 registry
docker: Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running
?.See 'docker run --help'.

//通過ps檢視，docker已經在執行
# ps aux|grep docker
root      8560  0.0  6.6 473952 67572 ?        Ssl  Apr03   1:05 /usr/bin/dockerd
root      8565  0.1  2.4 292476 24396 ?        Ssl  Apr03   2:05 docker-containerd --config /var/
run/docker/containerd/containerd.tomlroot     21570  0.0  0.0 112660   968 pts/0    R+   13:29   0:00 grep --color=auto docker

//命令前加sudo可以解決
# sudo docker run -d -p 5000:5000 registry