Building a custom docker container image and pushing it to Docker Hub – Docker Compose

Building a custom docker container image and pushing it to Docker Hub – Docker Compose

 

 

1, Install Docker in Ubuntu Linux using snap

 

$ sudo apt update

 

If your system doesn’t have snap then install snapd first

 

$ sudo apt install snapd

 

Install docker

 

$ sudo snap install docker

 

2, Create Dockerfile which contains sets of code in specific order,

 docker build command creates a custom image

 

Sample Dockerfile is as follows, nginx webserver

 

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

FROM nginx

COPY index.html /usr/share/nginx/html/

 

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

 

Folder structure looks like the below,

index.html file can be as simple as “This is my first web page”

 

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

 

ubuntu@ip-172-31-93-142:~/docker-compose-example$ ls -l

total 8

-rw-rw-r-- 1 ubuntu ubuntu  50 Oct 23 22:27 Dockerfile

-rw-rw-r-- 1 ubuntu ubuntu 423 Oct 23 22:26 index.html

ubuntu@ip-172-31-93-142:~/docker-compose-example$

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

3, Build Docker image and push it to Docker Hub

 

$ sudo docker build . -t nginx-webapp     ### This command builds a

custom docker image “nginx-webapp” by reading the Dockerfile

 

$ sudo docker run -itd -p 3333:80 nginx-webapp     ### This command

creates a docker container from image “nginx-webapp” and expose

the container on port 3333

 

$ curl http://localhost:3333   ### This command will now display the

custom website for you to verify

 

$ sudo docker tag  nginx-webapp abushad/nginx-webapp   ### This command creates a

new tag for your image so that its compatible with your docker hub and ready to

be pushed to docker hub , Format of tag is “dockerhubid/imagename”

 

$ sudo docker login   ### Use your username and password to login to your docker

 hub before you can push your docker image

 

$ sudo docker push abushad/nginx-webapp    ###Finally this will now push

your docker image to docker hub

 

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