- npm install
- npm start
The first line tells Docker to use another Docker (Node) image.
We’re using is the official Docker image for Node.js and it’s version 10 image.
The second line, sets a working directory from where the app code will live inside the Docker container.
We are copying the package.json file on third line.
We run npm install for dependencies in container on line four.
We are copying/bundling our code working directory into container working directory on line five.
On Line 6, we setup the port that Docker will expose when the container is running. Port 3000 in our case.
On line 7, we tell docker to execute our app inside the container by using node to run npm start.
$ sudo docker build -t node-web-app .Our Docker images is built now, we can innitate an container isntance of the image.
To see the available images in your linux machine
$ sudo docker imagesIt will list all the images available in you local machine
Key to remember, in our Dockerfile we exposed port 3000 and also in our code, Node is using port 3000.
Run Command to execute a running instance of an image
$ docker run -p 3000:3000 -d node-web-appIt will start your container in the detached mode(running container on background). If you remove -d flag it will up the container and you will see the output.
If you used -d flag and you want to insert in your container or want to see the logs, first you have to list all the running(up) containers
$ docker container ls -aIt will show all the running containers
ID IMAGE COMMAND ... PORTS
<your container id> node-web-app npm start ... 3000->3000
Now to see the logs of your container just grab the id of that container and run
$ docker container logs <your container id> Now the final step is to test your api after satisfying that your container is up and running. In your local machine run the command.
curl http://localhost:3000/api
It will give you the output
{"code":200,"success":true,"message":"Successfully completed"}
✨
After all the above process goes well, you build is successfull and your container is up
Now when I make any changes in code, It doesn't dynamically updates the api. I have to stop the container, remove it, build the image again, remove the earlier image and then restart the container from new image. Do I have to do this every time?
Try not to panic, you don't need to it again and after changing
53FB
any line of code. There are different ways to do it you can make docker-compose file
for this or you can mount your current directory to your container directory where the app is hosted.
I am going with the most easy one, although it is not 100% optimal.
You can run the command whic enables you to reflect your changes to your container
$ docker run -p 3000:3000 -d -v $(pwd):/usr/src/app node-web-app