Docker eating up disk space /var/lib/docker/devicemapper/devicemapper - docker

Question

We are using Docker and have a production issue. We are running out of space in our root volume since docker device mapper is eating up space.
Is there a way to reduce the disk space to a proper size without having to remove Docker and reinstall from scratch?
The docker version we are using is
Client:
Version: 1.8.2
API version: 1.20
Go version: go1.4.2
Git commit: 0a8c2e3
Built: Thu Sep 10 19:08:45 UTC 2015
OS/Arch: linux/amd64
Server:
Version: 1.8.2
API version: 1.20
Go version: go1.4.2
Git commit: 0a8c2e3
Built: Thu Sep 10 19:08:45 UTC 2015
OS/Arch: linux/amd64
We have 20 GB root volume and 12GB is used by docker. We are left with only few GB of space. The below docker file is 12GB
/var/lib/docker/devicemapper/devicemapper/data
We have also tried removing unused old docker images by using the command
docker images -q |xargs docker rmi
but still it doesn't work.
Appreciate if someone could let me know if there is any way to reduce the disk space to a proper size WITHOUT having to remove docker and reinstall from scratch? Also we don't want to copy files to a new location and do a softlink.
The current docker command outputs are
[root#ip-10-202-69-58 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
92558da1291a dockyardaws.kdc.capitalone.com/statim/plexus:27.6 "/root/go/src/plexus/" 19 hours ago Up 19 hours quality
2a0497fdbaa7 dockyardaws.kdc.capitalone.com/statim/plexus:21.9 "/root/go/src/plexus/" 21 hours ago Up 21 hours rmCallMetrics
1f5f93604e8f dockyardaws.kdc.capitalone.com/statim/loanservicing:8.3 "/root/go/src/loanser" 2 days ago Up 2 days ls_vznagtingestor
88b4d764c03c dockyardaws.kdc.capitalone.com/statim/plexus:21.3 "/root/go/src/plexus/" 3 days ago Up 3 days dlrMgmt
bd0ecfe2f9ae dockyardaws.kdc.capitalone.com/statim/plexus:12.1 "/root/go/src/plexus/" 3 days ago Up 3 days userRMAttributesIngestor
8bd3d626f7d7 dockyardaws.kdc.capitalone.com/statim/plexus:12.1 "/root/go/src/plexus/" 3 days ago Up 3 days dhPointsPerHour
383e257d2f31 dockyardaws.kdc.capitalone.com/statim/plexus:12.1 "/root/go/src/plexus/" 3 days ago Up 3 days dhPrimeSameDayContracts
6727c76221e4 dockyardaws.kdc.capitalone.com/statim/plexus:12.1 "/root/go/src/plexus/" 3 days ago Up 3 days rbcARMAgentsIngestor
527327182f0a dockyardaws.kdc.capitalone.com/statim/plexus:19.6 "/root/go/src/plexus/" 3 days ago Up 3 days dhDealerOrg
1ece1b0f61a7 dockyardaws.kdc.capitalone.com/statim/plexus:25.6 "/root/go/src/plexus/" 3 days ago Up 3 days shawMasterFileLvl1
8aefc887e1f5 dockyardaws.kdc.capitalone.com/statim/plexus:12.1 "/root/go/src/plexus/" 3 days ago Up 3 days dhExhaustEveryEffort
94b89a019b8c dockyardaws.kdc.capitalone.com/statim/plexus:22.1 "/root/go/src/plexus/" 3 days ago Up 3 days asmSummaryWeeklyMetrics
e64e9fe9c7e2 dockyardaws.kdc.capitalone.com/statim/plexus:12.1 "/root/go/src/plexus/" 3 days ago Up 3 days dhForecastedMetrics
f39c5fef33d3 dockyardaws.kdc.capitalone.com/statim/plexus:12.1 "/root/go/src/plexus/" 3 days ago Up 3 days dhMTDContracts
[root#ip-10-202-69-58 ~]#
[root#ip-10-202-69-58 ~]#
[root#ip-10-202-69-58 ~]# docker ps -qa
92558da1291a
2a0497fdbaa7
1f5f93604e8f
88b4d764c03c
bd0ecfe2f9ae
8bd3d626f7d7
383e257d2f31
6727c76221e4
527327182f0a
1ece1b0f61a7
8aefc887e1f5
94b89a019b8c
e64e9fe9c7e2
f39c5fef33d3
[root#ip-10-202-69-58 ~]#
[root#ip-10-202-69-58 ~]#
[root#ip-10-202-69-58 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
dockyardaws.kdc.capitalone.com/statim/plexus 27.6 75fd00165ca4 19 hours ago 976.7 MB
dockyardaws.kdc.capitalone.com/statim/loanservicing 8.3 84bf8f83af5b 2 days ago 973.4 MB
dockyardaws.kdc.capitalone.com/statim/plexus 25.6 672f56435428 13 days ago 976.9 MB
dockyardaws.kdc.capitalone.com/statim/plexus 22.1 3f0d00cf334a 3 weeks ago 976.4 MB
dockyardaws.kdc.capitalone.com/statim/plexus 21.9 783a4e812972 3 weeks ago 976.4 MB
dockyardaws.kdc.capitalone.com/statim/plexus 21.3 28a70e5a5621 3 weeks ago 976.3 MB
dockyardaws.kdc.capitalone.com/statim/plexus 19.6 b85f1fd3e822 4 weeks ago 975.4 MB
dockyardaws.kdc.capitalone.com/statim/plexus 12.1 ce572ad85088 9 weeks ago 971.8 MB
[root#ip-10-202-69-58 ~]#
[root#ip-10-202-69-58 ~]#
[root#ip-10-202-69-58 ~]# docker images -q
75fd00165ca4
84bf8f83af5b
672f56435428
3f0d00cf334a
783a4e812972
28a70e5a5621
b85f1fd3e822
ce572ad85088
[root#ip-10-202-69-58 ~]#

Answer 1

Try removing docker containers which are not running:
docker rm -v $(docker ps -a -q -f status=exited)
And then remove the unused docker images:
docker rmi $(docker images -q)