praveensivakumar1998 / simple-djongo-app-docker

simple-djongo-app-docker

i'm going to run a simple django application in a docker container and shared to my docker hub repository

Launch EC2 Instance with ubuntu image

Login to the Ubuntu server

$ sudo apt update -y

Install docker and modify permissions to run as ubuntu user

sudo apt install docker.io -y sudo usermomd -aG docker ubuntu

check the docker service status is active

sudo systemctl status docker

NOTE: Logout to the docker machine after modify the user group to active

Check the docker commands is run as ubuntu user

docker run hello-world

Output:

latest: Pulling from library/hello-world c1ec31eb5944: Pull complete Digest: sha256:4bd78111b6914a99dbc560e6a20eab57ff6655aea4a80c50b0c5491968cbc2e6 Status: Downloaded newer image for hello-world:latest

Hello from Docker! This message shows that your installation appears to be working correctly.

clone this repository in ubuntu server

git clone https://github.com/praveensivakumar1998/simple-djongo-app-docker.git

Navigate to the docker file location

cd simple-djongo-app-docker

Difference between ENTRYPOINT vs CMD vs RUN ?

CMD that can change or modify during execution or run docker run cmds whereas, ENTRYPOINT is couldnot able to change or modify during execution both are the actions when run on Docker run cmds

Refer this blog for more information: https://tonylixu.medium.com/docker-run-vs-cmd-vs-entrypoint-57f248b95889#:~:text=RUN%20executes%20commands%20and%20creates,docker%20run%20command%20line%20parameters.

Now get into our learnings

Lifecycle of Docker:

1. docker build -> builds docker images from Dockerfile
2. docker run -> runs container from docker images
3. docker push -> push the container image to public/private regestries to share the docker images.
4. docker pull -> pull the docker image from docker hub

1. Docker Build:

docker build -t praveensivakumar/dockerimg1:latest .

-t creating a tag for your image

. to specify the path for cmds to run

output:

Successfully built c875dd706215

Successfully tagged praveensivakumar/dockerimg1:latest

docker images -> to view the docker images in your server

2. Docker Run:

docker run -it praveensivakumar/dockerimg1:latest

-it tells docker that it should open an interactive container instance

output:

Django version 5.0.1, using settings 'devops.settings'

Starting development server at http://0.0.0.0:8080/

Now the docker container run only in the container itself, so we need to interactive with host operating system to run in outside the docker environment

docker run -p 8080:8080 -it praveensivakumar/dockerimg1

now we can able to see content of application in browser

3. Docker Push:

Login to Dockerhub in your ubuntu server to push the docker image

docker login

update your login credentials to log on to your docker hub

output:

docker push praveensivakumar/dockerimg1:latest

output:

The push refers to repository [docker.io/praveensivakumar/dockerimage1] 72a9eef5ee8e: Pushed ffec7cb2fd19: Pushed c064d6b49ba0: Pushed fd55a71a222a: Pushed 1a102d1cac2b: Pushed latest: digest: sha256:3f3600859303d8a3047daf8af4d65a2f570bb63287457510d63138d444f3ad69 size: 1363

Now you can check the image is pushed to your dockerhub

https://hub.docker.com/

Login to you docker hub account via your favourite browser and verify the image appears

4. Docker Pull:

docker push praveensivakumar/dockerimage1:tagname

use this above cmd to pull the image from your docker hub to your server