** PLEASE ONLY USE THIS ISSUE TRACKER TO SUBMIT ISSUES WITH THE DOCKER LABS TUTORIAL CONTENT **

Please provide the following information so we can assess the issue you're having

Which lab is it that you're having issues with?

2.0 Webapps with Docker, specifically 2.3.4, Push your image (https://github.com/docker/labs/blob/master/beginner/chapters/webapps.md#234-push-your-image)

Description

The instructions to push to docker.com are not complete. There is no way to successfully push via $ docker push userName/appname:tagname You will get an error: denied: requested access to the resource is denied

The fix is to login from the command line via docker login ( and respond to login/password prompts) BEFORE you attempt to $ docker push...

The instructions don't mention the requirement to login anywhere. Possible to get the instructions updated to so state? (and if I missed it, somehow, somewhere, apologies...)

Steps to reproduce the issue, if relevant:

1. Follow the tutorial for the flask app as written.
2. When you try to push to docker repository, it will fail with denied: requested access to the resource is denied
3. Have a nice day.

Describe the results you received:

Describe the results you expected:
Push to repository success at https://cloud.docker.com/swarm
Command line success = latest: digest: sha256:683c6a4a57e45410dc456e19f8fa91ce91dcb37d40e902a509263fa9a402b273 size: 1572 or words to that effect.

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker version:

$ docker version
Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Tue Mar 28 00:40:02 2017
 OS/Arch:      darwin/amd64

Server:
 Version:      17.03.1-ce
 API version:  1.27 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Fri Mar 24 00:00:50 2017
 OS/Arch:      linux/amd64
 Experimental: true

Output of docker info:

Containers: 1
 Running: 1
 Paused: 0
 Stopped: 0
Images: 8
Server Version: 17.03.1-ce
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins: 
 Volume: local
 Network: bridge host ipvlan macvlan null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 4ab9917febca54791c5f071a9d1f404867857fcc
runc version: 54296cf40ad8143b62dbcaa1d90e520a2136ddfe
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 4.9.27-moby
Operating System: Alpine Linux v3.5
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 3.855 GiB
Name: moby
ID: 64QX:5SAC:Z5FR:PLJ6:DKGZ:CTOY:JCJG:KF4X:23J6:B4I6:UTM2:AZRP
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
 File Descriptors: 25
 Goroutines: 40
 System Time: 2017-05-30T08:30:50.130189887Z
 EventsListeners: 2
No Proxy: *.local, 169.254/16
Registry: https://index.docker.io/v1/
Experimental: true
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

Additional environment details (AWS, Docker for Mac, Docker for Windows, VirtualBox, physical, etc.):