commit, tag, dockerfile, build, filter

• docker commit ContainerName ContainerName:Tag

How to create image from container.

It created 'commit_test:first' image.

$ docker run -i -t --name commit_test ubuntu:14.04 //Create ubuntu container
root@ac71ee960c10:/# echo test_first! >>first

$ docker commit commit_test commit_test:first //Create 'commit_test:first'image 
sha256:e87f81e9b28ac369d9284d1b066219caed0ca22ce4539efb6825a9883257bdc4

$ docker images
REPOSITORY    TAG       IMAGE ID       CREATED         SIZE
commit_test   first     e87f81e9b28a   4 minutes ago   197MB
ubuntu        14.04     13b66b487594   5 months ago    197MB

or

$ docker run -i -t --name commit_container1 ubuntu:14.04
root@83c0e5f3db97:/# echo my first push >> test

$ docker commit commit_container1 myimage:0.0 //Create 'myimage:0.0'image 
sha256:b19a821a88a18ab472d7e630380674bca4857b742cf89a27356996b49c3ffe75

 

How to create another image from 'commit_test:first' image.

1. Create the container from commit_test:first
$ docker run -i -t --name commit_test2 commit_test:first 

2. Add 'second' file 
root@c4bac8f4efd5:/# echo test_second! >> second 

3. Create 'commit_test:second'image
$ docker commit -m 'my second commit' commit_test2 commit_test:second 
sha256:dbf748f6d8c4a9b1e57fadcd88877f0483cbfe96bc29cba61d7b8d04f2407f39

 

• docker tag CurrentImageName NewImageName

Change or add the image name 

1. Change the currnet image name(myimage:0.0) to new image name(nayapeach/myimage:0.0)
$ docker tag myimage:0.0 nayapeach/myimage:0.0
$ docker images
REPOSITORY          TAG       IMAGE ID       CREATED         SIZE
myimage             0.0       b19a821a88a1   4 minutes ago   197MB
nayapeach/myimage   0.0       b19a821a88a1   4 minutes ago   197MB
ubuntu              14.04     13b66b487594   5 months ago    197MB

 

• dockerfile

How to create dockerfile

1. I want to get ubuntu:14.04 in this image
FROM ubuntu:14.04 
LABEL "purpose"="practice" 

2. It will be installed below
RUN apt-get update 
RUN apt-get install apache2 -y 

3. Add test.html(in my local) to container directory(/var/www/html)
ADD test.html /var/www/html 

4. Working directory
WORKDIR /var/www/html 

5. Implement "echo hello >> test2.html" using "/bin/bash"
RUN ["/bin/bash", "-c", "echo hello >> test2.html"] 
EXPOSE 80 
CMD apachectl -DFOREGROUND

 

• docker build -t ImageName:tag DockerfileDirectory

How to build dockerfile

-t : tag, apply the tag to the image

$ docker build -t mybuild:0.0 ./
[+] Building 26.5s (11/11) FINISHED        

...

 

• docker run -d -P 

How to create the container with dockerfile

-P : All port, let all the image port connect to the host

$ docker run -d -P --name myserver mybuild:0.0
09f21c5c7428f05aa9f7985b4c56c76af981f003a66ff0a1abfee7e3787ae590

 

• docker images --filter

How to filter the image by labeling.

$ docker images --filter "label=purpose=practice"
REPOSITORY   TAG       IMAGE ID       CREATED          SIZE
mybuild      0.0       ea61530ee86f   22 minutes ago   221MB

 

• -dt

Docker Tool, is a command-line tool for Docker operations.

docker run -dt -v $HOME/yoon:/tmp --name joohyun_python python:3.8

Share $HOME/yoon:/tmp with python:3.8

                     ⇡host                  ⇡container

named joohyun_python