Docker unable to connect to push to local registry using localhost:5000 - docker

Question

I am following the Docker page to run a local registry (https://docs.docker.com/registry/deploying/#run-a-local-registry). The registry container is running, but when I try to do docker push localhost:5000/nginx I get this error:
Get https://localhost:5000/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
I am, however, able to push using docker push 127.0.0.1:5000/nginx.
Any suggestions as to why this isn't working?
EDITED:
Here is my /etc/resolve.conf
domain bskyb.com
nameserver 172.20.220.26
nameserver 172.20.220.25
nameserver 10.5.212.21
The commands I ran:
[mwa51#OSTML0253700 ~] 2018-01-17 16:16:08$ docker push localhost:5000/nginx
The push refers to repository [localhost:5000/nginx]
Get https://localhost:5000/v2/: net/http: request canceled while
waiting for connection (Client.Timeout exceeded while awaiting headers)
[mwa51#OSTML0253700 ~] 2018-01-17 16:16:31$
[mwa51#OSTML0253700 ~] 2018-01-17 16:16:31$ docker push 127.0.0.1:5000/nginx
The push refers to repository [127.0.0.1:5000/nginx]
a103d141fc98: Layer already exists
73e2bd445514: Layer already exists
2ec5c0a4cb57: Layer already exists
1.13: digest:
sha256:926b086e1234b6ae9a11589c4cece66b267890d24d1da388c96dd8795b2ffcfb
size: 948
a103d141fc98: Layer already exists
73e2bd445514: Layer already exists
2ec5c0a4cb57: Layer already exists
latest: digest:
sha256:926b086e1234b6ae9a11589c4cece66b267890d24d1da388c96dd8795b2ffcfb
size: 948
[mwa51#OSTML0253700 ~] 2018-01-17 16:17:59$
And the output of docker inspect registry:
[
{
"Id": "bc9d9dd7e6d07d36176a542814375230c1d2e1f154993b832485f0b61af8c9d7",
"Created": "2018-01-17T10:16:01.269327669Z",
"Path": "/entrypoint.sh",
"Args": [
"/etc/docker/registry/config.yml"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 2431,
"ExitCode": 0,
"Error": "",
"StartedAt": "2018-01-17T16:15:32.851068237Z",
"FinishedAt": "2018-01-17T16:15:31.007531371Z"
},
"Image": "sha256:d1fd7d86a8257f3404f92c4474fb3353076883062d64a09232d95d940627459d",
"ResolvConfPath": "/var/lib/docker/containers/bc9d9dd7e6d07d36176a542814375230c1d2e1f154993b832485f0b61af8c9d7/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/bc9d9dd7e6d07d36176a542814375230c1d2e1f154993b832485f0b61af8c9d7/hostname",
"HostsPath": "/var/lib/docker/containers/bc9d9dd7e6d07d36176a542814375230c1d2e1f154993b832485f0b61af8c9d7/hosts",
"LogPath": "/var/lib/docker/containers/bc9d9dd7e6d07d36176a542814375230c1d2e1f154993b832485f0b61af8c9d7/bc9d9dd7e6d07d36176a542814375230c1d2e1f154993b832485f0b61af8c9d7-json.log",
"Name": "/registry",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {
"5000/tcp": [
{
"HostIp": "",
"HostPort": "5000"
}
]
},
"RestartPolicy": {
"Name": "always",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "shareable",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DiskQuota": 0,
"KernelMemory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/cc234dacc7f73dbbb58dbab1ca0109e57d4a470c225e20daf69678a9c53cb8e2-init/diff:/var/lib/docker/overlay2/7acfd81c53735574cf334d7bb4779136cc8a510886105850c12af7cf785d56a5/diff:/var/lib/docker/overlay2/462af7abc4dc1df8e7760d274616fc98ec2484450ef92a38702370696c6b2e77/diff:/var/lib/docker/overlay2/2e74aa672b9a2f6fef960d9411725ffbbf0b0c233326915f089da46d597c8888/diff:/var/lib/docker/overlay2/37b9a8f667053beee899b031cec8e473f0273b3582ea20e4bea2477737bf0065/diff:/var/lib/docker/overlay2/1508860708a3fb5c720eee143063f02c852548e9f608b4e56470cba86d2b98a9/diff",
"MergedDir": "/var/lib/docker/overlay2/cc234dacc7f73dbbb58dbab1ca0109e57d4a470c225e20daf69678a9c53cb8e2/merged",
"UpperDir": "/var/lib/docker/overlay2/cc234dacc7f73dbbb58dbab1ca0109e57d4a470c225e20daf69678a9c53cb8e2/diff",
"WorkDir": "/var/lib/docker/overlay2/cc234dacc7f73dbbb58dbab1ca0109e57d4a470c225e20daf69678a9c53cb8e2/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "volume",
"Name": "9f79a52daf7489c22409cf1629d01367d300a7f2519d3861579e43c73735a332",
"Source": "/var/lib/docker/volumes/9f79a52daf7489c22409cf1629d01367d300a7f2519d3861579e43c73735a332/_data",
"Destination": "/var/lib/registry",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
],
"Config": {
"Hostname": "bc9d9dd7e6d0",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"5000/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/etc/docker/registry/config.yml"
],
"ArgsEscaped": true,
"Image": "registry:2",
"Volumes": {
"/var/lib/registry": {}
},
"WorkingDir": "",
"Entrypoint": [
"/entrypoint.sh"
],
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "95e9979b7c9a9081262252d595c39b1601062f549b1ba16c7ac4fd7e1b5b04e8",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"5000/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "5000"
}
]
},
"SandboxKey": "/var/run/docker/netns/95e9979b7c9a",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "d55c67127f6fcb6a29c9aafcf3eda3f641f0854f2ae1054469b25142bb0f5f15",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "4dfe4b88f1906649d86797d7980908b7a6b5a5dadc40d9117340de6fd115e0f4",
"EndpointID": "d55c67127f6fcb6a29c9aafcf3eda3f641f0854f2ae1054469b25142bb0f5f15",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:02",
"DriverOpts": null
}
}
}
}
]
And also:
[mwa51#OSTML0253700 ~] 2018-01-17 16:21:28$ echo $DOCKER_HOST
returns blank