Flag provided but not defined -d while running docker container - docker

Question

I am trying to setup this https://github.com/jwasham/computer-science-flash-cards on my local pc using docker but after I have built my image,when I try
docker run -d -p 8000:8000 --name cs-flash-cards cs-flash-cards
it says
flag provided but not defined: -d
Any ideas how to fix this and run this container?
EDIT(on docker info;docker version I get the following info):
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 10
Server Version: 1.12.5
Storage Driver: devicemapper
Pool Name: docker-202:1-312980-pool
Pool Blocksize: 65.54 kB
Base Device Size: 10.74 GB
Backing Filesystem: xfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 877.5 MB
Data Space Total: 107.4 GB
Data Space Available: 2.019 GB
Metadata Space Used: 1.913 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.019 GB
Thin Pool Minimum Free Space: 10.74 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Deferred Deletion Enabled: false
Deferred Deleted Device Count: 0
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.110 (2015-10-30)
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: null host bridge overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options: apparmor seccomp
Kernel Version: 4.4.0-45-generic
Operating System: Ubuntu 16.04.1 LTS
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 990.7 MiB
Name: ip-172-31-33-253
ID: QPUK:E7BB:Y2PW:MPJR:L2X4:4AMT:VHAT:SOXK:3A2N:UKI2:ZXRK:QF4S
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
WARNING: No swap limit support
Insecure Registries:
127.0.0.0/8
Client:
Version: 1.12.5
API version: 1.24
Go version: go1.6.4
Git commit: 7392c3b
Built: Fri Dec 16 02:42:17 2016
OS/Arch: linux/amd64
Server:
Version: 1.12.5
API version: 1.24
Go version: go1.6.4
Git commit: 7392c3b
Built: Fri Dec 16 02:42:17 2016
OS/Arch: linux/amd64

Answer 1

Just for the next person who has the same problem.
this was for SystemD on Ubuntu LTS and the docker.service file
was the fix.
If you are on Centos7, you may have an extra file called override.conf
this is used to override the docker.service in systemd.
This file also has the -d flag
and is located in
/etc/systemd/system/docker.service.d/override.conf
replace -d with deamon here
do systemctl daemon-reload and docker will start up.