itsmee3223/learn-docker

Repo for learning docker

Docker

• Learn Docker - DevOps with Node.js & Express
• We'll start off by keeping things simple with a single container, and gradually add more complexity to our app by integrating a Mongo container, and then finally adding in a redis database for authentication.
• We'll learn how to do things manually with the cli, then move on to docker compose. We'll focus on the challenges of moving from a development environment to a production environment.
• We'll deploy and Ubuntu VM as our production server, and utilize a container orchestrator like docker swarm to handle rolling updates. ✏️ Course developed by Sanjeev Thiyagarajan. Check out his channel: https://www.youtube.com/channel/UC2sYgV-NV6S5_-pqLGChoNQ

Docker - Essential Commands

• The below are the list of essential commands needed when working directly with docker.

Commands	Description
docker ps	List all running containers
docker ps -a	List all containers stopped, running
docker stop container-id	Stop the container which is running
docker start container-id	Start the container which is stopped
docker restart container-id	Restart the container which is running
docker port container-id	List port mappings of a specific container
docker rm container-id or name	Remove the stopped container
docker rm -f container-id or name	Remove the running container forcefully
docker pull image-info	Pull the image from docker hub repository
docker pull stacksimplify/springboot-helloworld-rest-api:2.0.0-RELEASE	Pull the image from docker hub repository
docker exec -it container-name /bin/sh	Connect to linux container and execute commands in container
docker rmi image-id	Remove the docker image
docker logout	Logout from docker hub
docker login -u username -p password	Login to docker hub
docker stats	Display a live stream of container(s) resource usage statistics
docker top container-id or name	Display the running processes of a container
docker version	Show the Docker version information

List Running Containers

docker ps
docker ps -a
docker ps -a -q

Connect to Container Terminal

docker exec -it <container-name> /bin/sh

Container Stop, Start

docker stop <container-name>
docker start  <container-name>

Remove Container

docker stop <container-name>
docker rm <container-name>

Remove Image

docker images
docker rmi  <image-id>

Flow-2: Create a new Docker Image, Run as Container and Push to Docker Hub

Pre-requisite Step

• Create your Docker hub account.
• https://hub.docker.com/
• Important Note: In the below listed commands wherever you see dockerhubacc you can replace with your docker hub account id.

Step-1: Run the base Nginx container

• Access the URL http://localhost

docker run --name mynginxdefault -p 80:80 -d nginx
docker ps
docker stop mynginxdefault

Step-2: Create Dockerfile and copy our customized index.html

• Dockerfile

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

Step-3: Build Docker Image & run it

docker build -t dockerhubacc/mynginx_image1:v1 .
docker run --name mynginx1 -p 80:80 -d dockerhubacc/mynginx_image1:v1

Replace your docker hub account Id
docker build -t <your-docker-hub-id>/mynginx_image1:v1 .
docker run --name mynginx1 -p 80:80 -d <your-docker-hub-id>/mynginx_image1:v1

Step-4: Tag & push the Docker image to docker hub

docker images
docker tag dockerhubacc/mynginx_image1:v1 dockerhubacc/mynginx_image1:v1-release
docker push dockerhubacc/mynginx_image1:v1-release

Replace your docker hub account Id
docker tag <your-docker-hub-id>/mynginx_image1:v1 <your-docker-hub-id>/mynginx_image1:v1-release
docker push <your-docker-hub-id>/mynginx_image1:v1-release

Step-5: Verify the same on docker hub

• Login to docker hub and verify the image we have pushed
• Url: https://hub.docker.com/repositories