Updated with the updates-testing package:
docker push ${login_name}/${image_name} fails
docker push docker.io/${login_name}/${image_name} fails
docker tag ${image_id} docker.io/${login_name}/${image_name} and then docker push docker.io/${login_name}/${image_name} is OK
└> docker version
Client version: 1.6.0
Client API version: 1.18
Go version (client): go1.4.2
Git commit (client): 350a636/1.6.0
OS/Arch (client): linux/amd64
Server version: 1.6.0
Server API version: 1.18
Go version (server): go1.4.2
Git commit (server): 350a636/1.6.0
OS/Arch (server): linux/amd64
└> docker info
Containers: 1
Images: 1017
Storage Driver: devicemapper
Pool Name: docker-253:3-25304450-pool
Pool Blocksize: 65.54 kB
Backing Filesystem: extfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 33.4 GB
Data Space Total: 107.4 GB
Data Space Available: 73.97 GB
Metadata Space Used: 44.45 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.103 GB
Udev Sync Supported: true
Data loop file: /home/docker/devicemapper/devicemapper/data
Metadata loop file: /home/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.93 (2015-01-30)
Execution Driver: native-0.2
Kernel Version: 3.19.5-200.fc21.x86_64
Operating System: Fedora 21 (Twenty One)
CPUs: 4
Total Memory: 15.62 GiB
Name: fedolooz.kalaari.net
ID: TMPI:T5I4:XRWA:UXE2:IQJK:RUWS:HTIZ:4MIR:TNUX:ZULS:G4R5:MZ6J
Username: looztra
Registry: [https://index.docker.io/v1/]