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I googled and saw this but I don't know what it is saying about image tags, etc: link

I am trying to complete the tutorial here: tutorial official Docker

Here is my output for docker images

nobu@nobu-ThinkPad-T420:~/docker/docker-curriculum/flask-app$ docker images
REPOSITORY                TAG                 IMAGE ID            CREATED             SIZE
prakhar1989/catnip        latest              517dbced092c        About an hour ago   700MB
nginx                     latest              06144b287844        2 weeks ago         109MB
busybox                   latest              e1ddd7948a1c        7 weeks ago         1.16MB
prakhar1989/catnip        <none>              c984660fe008        7 weeks ago         700MB
hello-world               latest              2cb0d9787c4d        2 months ago        1.85kB
python                    3-onbuild           292ed8dee366        2 months ago        691MB
prakhar1989/static-site   latest              f01030e1dcf3        2 years ago         134MB

What I don't understand is which column above shows the image name? I see a column for repo and then for ID but neither seems to fit the bill and the tutorial skips over this key piece of info.

I was able to run the app on localhost:8888.

I don't know why I am getting:

nobu@nobu-ThinkPad-T420:~/docker/docker-curriculum/flask-app$ docker push prakhar1989/catnip
The push refers to repository [docker.io/prakhar1989/catnip]
f438d02b6568: Preparing 
0a0917397206: Preparing 
b24e1ed3eb49: Preparing 
29778035860f: Preparing 
fc88d2431f4d: Preparing 
1dc1b82fa010: Waiting 
09e3fd9cf357: Waiting 
138d1921c15b: Waiting 
d714f65bc280: Waiting 
fd6060e25706: Waiting 
d7ed640784f1: Waiting 
1618a71a1198: Waiting 
denied: requested access to the resource is denied

I have an account on Docker Hub and set up a public repository. Can someone give me hints on what command I need to enter to push this?

mLstudent33
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3 Answers3

3

The creator of the tutorial forgot to mention we have to tag the image first with docker tag {image ID number} yourhubusername/{name_of_your_choice]:firsttry where :firsttry is a tag (I'll post photos below).

Here is the terminal output from the above tagging and then docker push

nobu@nobu-ThinkPad-T420:~/docker/docker-curriculum/flask-app$ docker tag 0690a67d2358 hockeymonkey96/catnip:firsttry
nobu@nobu-ThinkPad-T420:~/docker/docker-curriculum/flask-app$ docker push hockeymonkey96/catnip
The push refers to repository [docker.io/hockeymonkey96/catnip]
9da301382602: Pushed 
40a74dab97c5: Pushed 
d27f618acc37: Pushed 
29778035860f: Mounted from prakhar1989/catnip 
fc88d2431f4d: Mounted from prakhar1989/catnip 
1dc1b82fa010: Mounted from prakhar1989/catnip 
09e3fd9cf357: Mounted from prakhar1989/catnip 
138d1921c15b: Mounted from prakhar1989/catnip 
d714f65bc280: Mounted from prakhar1989/catnip 
fd6060e25706: Mounted from prakhar1989/catnip 
d7ed640784f1: Mounted from prakhar1989/catnip 
1618a71a1198: Mounted from prakhar1989/catnip 
firsttry: digest: sha256:39193977dfe6474d77127aea2b249105669d0683988a3c7043ac66eb2264141e size: 2840

Now when I look at Docker Hub, I can see it:

enter image description here

And that :firsttry tag is here:

enter image description here

mLstudent33
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3

This is happening because your docker hub account is not login in your terminal

First login your docker account by using following command

sudo docker login
username: your username
password : your password

Second push your local repository into docker hub by using following command 

sudo docker tag local-image:tagname reponame:tag
sudo docker push reponame:tag

eg. sudo docker tag tagId dockerdemo:latest

sudo docker push dockerdemo:latest

Ganesh Apune
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3

Here is a common mistake I make, thought this might help someone.

Make sure you are consistent in using sudo across login and push. .i.e:

  1. docker login should always be followed by docker push and
  2. sudo docker login should always be followed by sudo docker push

This is because of the config for sudo docker and docker are different files in the system.

Jithin Pavithran
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