Getting started docker notes

Getting Started
Last Updated Date: 08/04/2020

Steps and Code

1. Lets Install Docker - Ubuntu Machine (snap need to be installed)

snap install docker
Note: sudo is required in some cases, else you can switch to root and operate .
Also, setting up with root is not recommended if you are in production or development
machine.

2. Verify it is installed

docker --version

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3. Let’s Pull a Docker image

docker pull bitnami/node-example:0.0.1

4. Let’s See all the docker image in our system, at this point docker image is not running
so we use

docker image-name

5. Let’s run the docker image we downloaded

docker run -p 3000:3000 bitnami/node-example:0.0.1

or

docker run -it --rm -p 3000:3000 bitnami/node-example:0.0.1

Note: -it is interactive logs
-p port mapping <own port>:<docker port>
-rm Automatically remove the container when it exits
-d Background running , detached mode
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docker run -it --rm -p 3000:3000 -d bitnami/node-example:0.0.1

or

Note: - Running with Docker CONTAINER ID -d,
- For running ID’s 3 characters are enough if it makes it unique

docker run -it --rm -p 3000:3000 -d 8b8

or

docker run -it -p 3000:3000 bitnami/node-example:0.0.1

or

Note: name docker run ––name nginx–test –d nginx here, name is optional

docker run -it -p 3001:3000 --name bit bitnami/node-example:0.0.1

or

6. Stop a docker container

docker stop [container ID/name]
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7. Check the Status and Health of the Docker and status

docker inspect [container ID/name]

8. Check the App Logs inside Docker

docker logs [container ID/name]

9. Remove the Docker container from memory

docker rm [Name of Container/ID]

or

Note: We can also perform the below command to remove all, so carefull !

docker rm $(docker ps -a)

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10. Remove Image from the Docker container

docker image rm [container ID/name]

Note: If the image is in memory, it needs to be forced with -f flag, then the image will
delink from the memory instance and get deleted

docker image rm [container ID/name] -f

or

docker image rm $(docker image ls -a)

11. Connecting to Docker Image

docker pull nginx
docker run -it -p 8081:80 -d nginx:latest

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12. Going inside Docker using exec

docker exec -it [name] /bin/bash

13. Steps to Build Docker file With a Simple NodeJS App

In these steps, we will install IDE in your cloud VM. After that, we will install the IDE and
create a simple NodeJS App and Add it in a Docker container.
Note: In cloud system you can use cloud editor from here:
https://github.com/cdr/code-server/releases With below steps and command
Step A:

wget
https://github.com/cdr/code-server/releases/download/2.1692-vsc1.39.2
/code-server2.1692-vsc1.39.2-linux-x86_64.tar.gz

Step B:

tar -xf code-server2.1692-vsc1.39.2-linux-x86_64.tar.gz

Step C:

cd code-server
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Step D: Change Permission

chmod 777 code-server

Step E: Start the Editor(use of Sudo is for entering into admin mode to edit files which
have special permission with Editor)

sudo ./code-server .. -p 8443

Note: You will get the password to enter the IDE which will be required to use it

Step F: Install NodeJS in the machine to use

$ curl -sL https://deb.nodesource.com/setup_13.x | sudo -E bash -
$ sudo apt-get install nodejs

Step G: Create a Blank Project With NodeJS and Express

$ npm init
$ touch index.js
$ touch Dockerfile
$ npm i express

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Step H: Add node index.js as the start script

"scripts": {
"start": "node index.js"
}

Step I: Inside Index.js add below code

const express = require('express');
// Constants
const PORT = 8080;
const HOST = '0.0.0.0';
// App
const app = express();
app.get('/', (req, res) => {
res.send('Hello worldn');
});
app.listen(PORT, HOST);
console.log(`Running on http://${HOST}:${PORT}`);

Step J: Create Dockerfile with below content

# Create app directory
WORKDIR /usr/src/app
# Install app dependencies
# A wildcard is used to ensure both package.json AND
package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./
RUN npm install
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# If you are building your code for production
# RUN npm ci --only=production
# Bundle app source
COPY . .
EXPOSE 8080
CMD [ "node", "index.js" ]

Step K: Now Building Docker Image

docker build -t demoapp .

Step L: Now, check the newly build containers

docker image ls -a

Step M: Run the Docker image which we created, here demoapp:latest is name:tag

docker run -it -d -p 8083:8080 demoapp:latest

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Getting started docker notes

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