Knowledge: Docker Part2

Docker Part2

Class 80th DOCKER Part2 August 2nd

What is Containerization

Creating Container

Step1:

root@ip-10-0-2-61:~# hostnamectl set-hostname dockerhost

root@ip-10-0-2-61:~# sudo -i

--Remove if already exist

root@dockerhost:~# docker rm container1

container1

--Create new container -it going inside the container1

root@dockerhost:~# docker run -it --name container1 ubuntu

root@adc881f1c093:/#

Install the application packages in the container

--apt update in container

root@adc881f1c093:/# apt update

-- Tomcat apache installed in container

root@adc881f1c093:/# apt install apache2 -y

root@adc881f1c093:/# apache2 -v

Server version: Apache/2.4.58 (Ubuntu)

Server built: 2025-07-14T16:22:22

--Tree install

root@adc881f1c093:/# apt install tree -y

Creating Some files 1 to 5

root@adc881f1c093:/# touch file{1..5}

-rw-r--r-- 1 root root 0 Aug 10 18:23 file5

-rw-r--r-- 1 root root 0 Aug 10 18:23 file4

-rw-r--r-- 1 root root 0 Aug 10 18:23 file3

-rw-r--r-- 1 root root 0 Aug 10 18:23 file2

-rw-r--r-- 1 root root 0 Aug 10 18:23 file1

root@adc881f1c093:/# cat >file1

This is my container1 file1

Step2:

Custom Image Container backup

We have only one image

root@dockerhost:~# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

ubuntu latest 65ae7a6f3544 3 weeks ago 78.1MB

We have only one Container

root@dockerhost:~# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

adc881f1c093 ubuntu "/bin/bash" 12 minutes ago Up 12 minutes container1

Docker commit

Step3: Create new image using container1( container1 has all package information)

root@dockerhost:~# docker commit container1 ubuntupkh_img:v1

sha256:327dee052d80405da2565ef6e042f8e2be3eb5226af23af4217408c8b0d57921

root@dockerhost:~# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

ubuntupkh_img v1 327dee052d80 43 seconds ago 245MB

ubuntu latest 65ae7a6f3544 3 weeks ago 78.1MB

Using New image creating new containers

Step4: see here automatically came on packages and files information in container2

root@dockerhost:~# docker run -it --name container2 ubuntupkh_img:v1

root@b95d921f2476:/# ls -lrt

dr-xr-xr-x 13 root root 0 Aug 10 18:22 sys

-rw-r--r-- 1 root root 0 Aug 10 18:23 file5

-rw-r--r-- 1 root root 0 Aug 10 18:23 file4

-rw-r--r-- 1 root root 0 Aug 10 18:23 file3

-rw-r--r-- 1 root root 0 Aug 10 18:23 file2

-rw-r--r-- 1 root root 28 Aug 10 18:24 file1

drwxr-xr-x 1 root root 4096 Aug 10 18:38 etc

dr-xr-xr-x 181 root root 0 Aug 10 18:38 proc

drwxr-xr-x 5 root root 360 Aug 10 18:38 dev

See file and packages exists

root@b95d921f2476:/# tree --version

root@b95d921f2476:/# apache2 -v

Server version: Apache/2.4.58 (Ubuntu)

Server built: 2025-07-14T16:22:22

We can called Containerization ,this is called os level virtualization, it main purpose reusability

DOCKERFILE:

it is an automation way to create image.

here we use components to create image.

in Dockerfile D must be Capital.

Components also capital.

To write our instructions we need to use components in Dockerfile

This Dockerfile will be Reuseable.

here we can create image directly without container help.

Name: Dockerfile

COMPONENTS:

FROM : used to base image

RUN : used to run linux commands (During image creation)

CMD : used to run linux commands (After container creation)

ENTRYPOINT : high priority than cmd

COPY : to copy local files to container

ADD : to copy internet files to container

WORKDIR : to open req directory

LABEL : to add labels for docker images

ENV : to set env variables (inside container)

ARGS : to pass env variables (outside containers)

EXPOSE : to indicate port number

VOLUME

NETWORK

Step5: for all instruction you need components

Dockerfile -->image-->container

Kill the container using below command

root@dockerhost:~# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

b95d921f2476 ubuntupkh_img:v1 "/bin/bash" 14 minutes ago Up 14 minutes container2

adc881f1c093 ubuntu "/bin/bash" 36 minutes ago Up 36 minutes container1

root@dockerhost:~# docker ps -aq

b95d921f2476

adc881f1c093

root@dockerhost:~# docker kill $(docker ps -aq)

b95d921f2476

adc881f1c093

root@dockerhost:~# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

b95d921f2476 ubuntupkh_img:v1 "/bin/bash" 15 minutes ago Exited (137) 8 seconds ago container2

adc881f1c093 ubuntu "/bin/bash" 37 minutes ago Exited (137) 8 seconds ago container1

Remove containers

root@dockerhost:~# docker rm $(docker ps -aq)

b95d921f2476

adc881f1c093

root@dockerhost:~# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

Remove images

root@dockerhost:~# docker images -q

327dee052d80

65ae7a6f3544

root@dockerhost:~# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

ubuntupkh_img v1 327dee052d80 21 minutes ago 245MB

ubuntu latest 65ae7a6f3544 3 weeks ago 78.1MB

root@dockerhost:~# docker rmi $(docker images -q)

Untagged: ubuntupkh_img:v1

Deleted: sha256:327dee052d80405da2565ef6e042f8e2be3eb5226af23af4217408c8b0d57921

Deleted: sha256:4a286e29abe731e078404a9bdc200ff3cec139e5d69ec2456c3aa0a465973fc1

Untagged: ubuntu:latest

Untagged: ubuntu@sha256:a08e551cb33850e4740772b38217fc1796a66da2506d312abe51acda354ff061

Deleted: sha256:65ae7a6f3544bd2d2b6d19b13bfc64752d776bc92c510f874188bfd404d205a3

Deleted: sha256:107cbdaeec042e6154640c94972c638f4e2fee795902b149e8ce9acbd03d59d7

Step6: Docker file creating steps

ENTRYPOINT VS CMD:

FROM ubuntu

ENTRYPOINT ["sleep"]

CMD ["1000"]

root@dockerhost:~# vim Dockerfile

root@dockerhost:~# cat Dockerfile

FROM ubuntu

RUN apt update -y

RUN apt install apache2 -y

RUN apt install python3 -y

CMD apt install mysql-server -y

Step7: Build docker image, As see my sql not installed , it is cmd prompt ,so it will run whenevery container creating time

root@dockerhost:~# docker build -t dockerimage:v1 .

Step 5/5 : CMD apt install mysql-server -y
---> Running in 72d94de11f19
---> Removed intermediate container 72d94de11f19
---> 162f726580bf

Successfully built 162f726580bf

Successfully tagged dockerimage:v1

root@dockerhost:~# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

dockerimage v1 162f726580bf 34 seconds ago 281MB

ubuntu latest 65ae7a6f3544 3 weeks ago 78.1MB

Step8: Create container,now see mysql installing

root@dockerhost:~# docker run -it --name containerdocker1 dockerimage:v1

Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

The following additional packages will be installed:

Setting up libcgi-fast-perl (1:2.17-1) ...

Setting up mysql-server (8.0.42-0ubuntu0.24.04.2) ...

Processing triggers for libc-bin (2.39-0ubuntu8.5) ...

One more image COPY command existing file copy to /tmp folder ADD command for dowload software from intenet and placing in /tmp folder

Step9: copy and add

root@dockerhost:~# vi Dockerfile

root@dockerhost:~# cat Dockerfile

FROM ubuntu

COPY index.html /tmp

ADD https://dlcdn.apache.org/tomcat/tomcat-11/v11.0.10/src/apache-tomcat-11.0.10-src.zip /tmp

Step10: now again build new image

root@dockerhost:~# docker build -t dockercpimage:v2 .

DEPRECATED: The legacy builder is deprecated and will be removed in a future release.

Install the buildx component to build images with BuildKit:

https://docs.docker.com/go/buildx/

Sending build context to Docker daemon 30.72kB

Step 1/3 : FROM ubuntu

---> 65ae7a6f3544

Step 2/3 : COPY index.html /tmp

---> 0087e026e831

Step 3/3 : ADD https://dlcdn.apache.org/tomcat/tomcat-11/v11.0.10/src/apache-tomcat-11.0.10-src.zip /tmp

Downloading [==================================================>] 11.44MB/11.44MB

---> 23b4041c4bf6

Successfully built 23b4041c4bf6

Successfully tagged dockercpimage:v2

root@dockerhost:~# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

dockercpimage v2 23b4041c4bf6 About a minute ago 89.6MB

dockerimage v1 162f726580bf 14 minutes ago 281MB

ubuntu latest 65ae7a6f3544 3 weeks ago 78.1MB

Step11: Creating Container, now see cp coming local , tomcat coming from internet website

root@dockerhost:~# docker run -it --name containercp1 dockercpimage:v2

root@e9429dfc244e:/# cd /tmp

root@e9429dfc244e:/tmp# ls

apache-tomcat-11.0.10-src.zip index.html

Step12: WORKDIR,LABEL ,build again creating new image

WORKERDIR it will goto specific path

LABEL give specific name to image

root@dockerhost:~# docker build -t dockercpimage1:v3 .

DEPRECATED: The legacy builder is deprecated and will be removed in a future release.

Install the buildx component to build images with BuildKit:

https://docs.docker.com/go/buildx/

Sending build context to Docker daemon 31.23kB

Step 1/5 : FROM ubuntu

---> 65ae7a6f3544

Step 2/5 : COPY index.html /tmp

---> Using cache

---> 0087e026e831

Step 3/5 : ADD https://dlcdn.apache.org/tomcat/tomcat-11/v11.0.10/src/apache-tomcat-11.0.10-src.zip /tmp

Downloading [==================================================>] 11.44MB/11.44MB

---> Using cache

---> 23b4041c4bf6

Step 4/5 : WORKDIR /tmp

---> Running in 290cb2b88cd2

---> Removed intermediate container 290cb2b88cd2

---> aed410d8af71

Step 5/5 : LABEL author vakatisubbu

---> Running in 471636289f7c

---> Removed intermediate container 471636289f7c

---> e2720128a90d

Successfully built e2720128a90d

Successfully tagged dockercpimage1:v3

Step13: it is going automatically temp directory, docker inspect label author name checking with ur name

root@dockerhost:~# docker run -it --name containerwrk2 dockercpimage1:v3

root@2afd2fdc76f3:/tmp#

exit from container ctrl+P+Q

root@2afd2fdc76f3:/tmp# docker inspect root@dockerhost:~#

"Labels": {

"author": "vakatisubbu",

"org.opencontainers.image.ref.name": "ubuntu",

"org.opencontainers.image.version": "24.04"

}

Step14: ENV for environment variables EXPOSE for container which port to run

root@dockerhost:~# cat Dockerfile

FROM ubuntu

ENV user vakatisubbu

ENV client swiggy

EXPOSE 8080

Step15: Dockerbuild and create container

root@dockerhost:~# docker build -t dockerendimage2:v4 .

DEPRECATED: The legacy builder is deprecated and will be removed in a future release.

Install the buildx component to build images with BuildKit:

https://docs.docker.com/go/buildx/

Sending build context to Docker daemon 31.23kB

Step 1/4 : FROM ubuntu

---> 65ae7a6f3544

Step 2/4 : ENV user vakatisubbu

---> Running in c9329776bcde

---> Removed intermediate container c9329776bcde

---> 1433b1258b7f

Step 3/4 : ENV client swiggy

---> Running in 3cfea1ee6546

---> Removed intermediate container 3cfea1ee6546

---> eeac0fd1965a

Step 4/4 : EXPOSE 8080

---> Running in aeb3d9efcf03

---> Removed intermediate container aeb3d9efcf03

---> 79148bd0f0ce

Successfully built 79148bd0f0ce

Successfully tagged dockerendimage2:v4

root@dockerhost:~# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

dockerendimage2 v4 79148bd0f0ce 22 seconds ago 78.1MB

dockercpimage1 v3 e2720128a90d 9 minutes ago 89.6MB

dockercpimage v2 23b4041c4bf6 18 minutes ago 89.6MB

dockerimage v1 162f726580bf 31 minutes ago 281MB

ubuntu latest 65ae7a6f3544 3 weeks ago 78.1MB

Step16:

root@dockerhost:~# docker run -it --name containerenv2 dockerendimage2:v4

root@fc37e72ef91a:/#

username came with your name

root@fc37e72ef91a:/# echo $user

vakatisubbu

root@fc37e72ef91a:/# echo $client

swiggy

docker running which port

root@dockerhost:~# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

fc37e72ef91a dockerendimage2:v4 "/bin/bash" About a minute ago Up About a minute 8080/tcp containerenv2

2afd2fdc76f3 dockercpimage1:v3 "/bin/bash" 11 minutes ago Up 11 minutes containerwrk2

e9429dfc244e dockercpimage:v2 "/bin/bash" 18 minutes ago Up 18 minutes containercp1

Step17: Below official document more comments for refernces

https://docs.docker.com/reference/dockerfile/

Build one netflex application

NETFLIX-DEPLOYMENT:

apt install git -y

git clone https://github.com/RAHAMSHAIK007/netflix-clone.git

cd netflix-clone/

Vi Dockerfile

FROM ubuntu

RUN apt update

RUN apt install apache2 -y

COPY * /var/www/html/

CMD ["/usr/sbin/apachectl", "-D", "FOREGROUND"]

docker build -t netflix:v1 .

docker run -it --name netflix1 -p 80:80 netflix:v1

Step1:

root@dockerhost:~# git clone https://github.com/RAHAMSHAIK007/netflix-clone.git

Cloning into 'netflix-clone'...

remote: Enumerating objects: 130, done.

remote: Counting objects: 100% (20/20), done.

remote: Compressing objects: 100% (19/19), done.

remote: Total 130 (delta 14), reused 1 (delta 1), pack-reused 110 (from 2)

Receiving objects: 100% (130/130), 47.61 KiB | 4.76 MiB/s, done.

Resolving deltas: 100% (75/75), done.

root@dockerhost:~# pwd

/root

root@dockerhost:~# cd netflix-clone/

Step2: Create one docker file here

root@dockerhost:~/netflix-clone# ls -lrt

total 56

-rw-r--r-- 1 root root 106 Aug 10 19:50 README.md

-rw-r--r-- 1 root root 2829 Aug 10 19:50 style.css

-rw-r--r-- 1 root root 666 Aug 10 19:50 session.js

-rw-r--r-- 1 root root 6706 Aug 10 19:50 script.js

-rw-r--r-- 1 root root 1018 Aug 10 19:50 register.js

-rw-r--r-- 1 root root 2908 Aug 10 19:50 register.html

-rw-r--r-- 1 root root 574 Aug 10 19:50 register.css

-rw-r--r-- 1 root root 1846 Aug 10 19:50 plan.md

-rw-r--r-- 1 root root 1163 Aug 10 19:50 login.js

-rw-r--r-- 1 root root 2672 Aug 10 19:50 login.html

-rw-r--r-- 1 root root 698 Aug 10 19:50 login.css

-rw-r--r-- 1 root root 3609 Aug 10 19:50 index.html

drwxr-xr-x 2 root root 4096 Aug 10 19:50 assets

Step3:CMD ["/usr/sbin/apachectl","FOREGROUND"] ,this command if you exit from the container,

even though apachectl run ,it will foreground from backend

root@dockerhost:~/netflix-clone# vi Dockerfile

root@dockerhost:~/netflix-clone# cat Dockerfile

FROM ubuntu

RUN apt update -y

RUN apt install apache2 -y

COPY * /var/www/html/

CMD ["/usr/sbin/apachectl","-D","FOREGROUND"]

Step4:

root@dockerhost:~/netflix-clone# docker build -t dockernetflexfinal .

Successfully built 727cd091145b

Successfully tagged dockernetflexfinal:latest

root@dockerhost:~/netflix-clone# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

dockernetflexfinal latest 727cd091145b 22 seconds ago 245MB

dockernetflex v4 ae3c756c75a6 11 minutes ago 245MB

dockernetflex latest c6219b442e36 22 minutes ago 245MB

dockernetflex v1 c6219b442e36 22 minutes ago 245MB

ubuntu latest 65ae7a6f3544 3 weeks ago 78.1MB

Step5:

root@dockerhost:~/netflix-clone# docker run -it --name containernetfinal -p 83:80 dockernetflexfinal

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message

Step6:

Step7: if you want change any some line code in login page you edit can build create container

for ex: NETFLEX V-4.0 changed to NETFLEX V-5.0

Step8:

root@dockerhost:~/netflix-clone# docker build -t dockernetflexfinal1 .

DEPRECATED: The legacy builder is deprecated and will be removed in a future release.

Install the buildx component to build images with BuildKit:

https://docs.docker.com/go/buildx/

Sending build context to Docker daemon 185.3kB

Step 1/5 : FROM ubuntu

---> 65ae7a6f3544

Step 2/5 : RUN apt update -y

---> Using cache

---> f2511e97f53b

Step 3/5 : RUN apt install apache2 -y

---> Using cache

---> aff58ac566bc

Step 4/5 : COPY * /var/www/html/

---> ec7b4377c133

Step 5/5 : CMD ["/usr/sbin/apachectl","-D","FOREGROUND"]

---> Running in 1dee218601b8

---> Removed intermediate container 1dee218601b8

---> 5f0d03a2fc93

Successfully built 5f0d03a2fc93

Successfully tagged dockernetflexfinal1:latest

root@dockerhost:~/netflix-clone# docker run -it --name containernetfinal1 -p 84:80 dockernetflexfinal1

Step9:

--Thanks

Knowledge

Saturday, August 2, 2025

Docker Part2

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