Docker Command Part-10 By Raj Gupta

How to create custom image from custom docker file

[root@ip-172-31-85-137 ~]# mkdir dockerfiles
[root@ip-172-31-85-137 ~]# cd dockerfiles/
[root@ip-172-31-85-137 dockerfiles]# vi Dockerfile
[root@ip-172-31-85-137 dockerfiles]# cat Dockerfile
FROM ubuntu:16.04
[root@ip-172-31-85-137 dockerfiles]# docker image build -t rajubuntu:1 .
Sending build context to Docker daemon  2.048kB
Step 1/1 : FROM ubuntu:16.04
16.04: Pulling from library/ubuntu
35b42117c431: Pull complete
ad9c569a8d98: Pull complete
293b44f45162: Pull complete
0c175077525d: Pull complete
Digest: sha256:a4d8e674ee993e5ec88823391de828a5e9286a1597b731eaecaaf9066cfdf539
Status: Downloaded newer image for ubuntu:16.04
 ---> 13c9f1285025
Successfully built 13c9f1285025
Successfully tagged rajubuntu:1
[root@ip-172-31-85-137 dockerfiles]# docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
rajubuntu           1                   13c9f1285025        3 weeks ago         119MB
ubuntu              16.04               13c9f1285025        3 weeks ago         119MB
[root@ip-172-31-85-137 dockerfiles]# docker container run -it rajubuntu:1
root@77099511689e:/# tree     ----not found
bash: tree: command not found
root@77099511689e:/# exit
exit

-----------------------------------------------------------------------------

[root@ip-172-31-85-137 dockerfiles]# vi Dockerfile
[root@ip-172-31-85-137 dockerfiles]# cat Dockerfile
FROM ubuntu:16.04
RUN apt-get update && apt-get install -y tree
[root@ip-172-31-85-137 dockerfiles]# docker image build -t rajubuntu:2 .
[root@ip-172-31-85-137 dockerfiles]# docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
rajubuntu           2                   13c9f1285025        3 weeks ago         119MB
rajubuntu           1                   13c9f1285025        3 weeks ago         119MB
ubuntu              16.04               13c9f1285025        3 weeks ago         119MB

[root@ip-172-31-85-137 dockerfiles]# docker container run -it rajubuntu:2
root@1fd15222b539:/#tree      ------already install

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[root@ip-172-31-85-137 dockerfiles]# vi Dockerfile
[root@ip-172-31-85-137 dockerfiles]# cat Dockerfile
FROM ubuntu:16.04
RUN apt-get update && apt-get install -y tree
RUN touch /tmp/1.txt
RUN touch /tmp/2.txt
RUN touch /tmp/3.txt
RUN touch /tmp/4.txt
RUN touch /tmp/5.txt
RUN touch /tmp/6.txt

[root@ip-172-31-85-137 dockerfiles]# docker image build -t rajubuntu:3 .

[root@ip-172-31-85-137 dockerfiles]# docker image ls

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

rajubuntu           3                   31a9e63bc1ee        3 minutes ago       146MB

rajubuntu           2                   09a779b278b9        21 minutes ago      146MB

rajubuntu           1                   13c9f1285025        3 weeks ago         119MB

ubuntu              16.04               13c9f1285025        3 weeks ago         119MB

[root@ip-172-31-85-137 dockerfiles]# docker container run -it rajubuntu:3

root@a4d906421e5a:/# cd tmp/

root@a4d906421e5a:/tmp# ls

1.txt  2.txt  3.txt  4.txt  5.txt  6.txt

root@a4d906421e5a:/tmp# tree .

.

|-- 1.txt

|-- 2.txt

|-- 3.txt

|-- 4.txt

|-- 5.txt

`-- 6.txt

0 directories, 6 files

root@a4d906421e5a:/tmp#

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[root@ip-172-31-85-137 dockerfiles]# vi Dockerfile

[root@ip-172-31-85-137 dockerfiles]# cat Dockerfile

FROM ubuntu:16.04

RUN apt-get update && apt-get install -y tree

RUN touch /tmp/1.txt

RUN touch /tmp/2.txt

RUN touch /tmp/3.txt

RUN touch /tmp/4.txt

RUN touch /tmp/5.txt

RUN touch /tmp/6.txt

RUN echo "Raj Kumar Gupta"

RUN echo "Raj Kumar Gupta"

RUN echo "Raj Kumar Gupta"

RUN echo "Raj Kumar Gupta"

[root@ip-172-31-85-137 dockerfiles]# docker image build -t rajubuntu:4 .

Note:-  When ever you want to add any or change any thing in docker file try to do at the end of file because if you do in begging or in middle then all the command after that will run but if add in the end then only that line will be run rest will take from cache and you will save your time