We are going to create a Docker image for Node.js app.
It's very simple, 12-line Node.js server-app. The app doesn't depend on any other technologies or tools, e.g. database, searching engine and so on.
The app consist of these files
index.js
package.json
package-lock.json
There is only one dependency in package.json, it's Express.js framework.
There are 2 files related docker
.dockerignore
Dockerfile
In .dockerignore file you should add ignoring files or directory which you don't want to build in docker image.
About Dockerfile content is written in Node.js official doc. There are 2 small differences between our and their Dockerfile files.
I changed WORKDIR to /usr/src/, and removed EXPOSE part.
1 Build your image.
docker build . -t yourHubDockerUsername/yourImageName
in my case: docker build . -t vladdius/node-js-server-image
2 Tag your image (it's an option command, if you want you can add :version1.0, otherwise it's default latest version)
docker tag yourImageId yourHubDockerUsername/yourImageName:version1.0
in my case: docker tag yourImageId vladdius/node-js-server-image:version1.0
3 Create your image repository in docker hub, as we do it in github for git repositories. (in our vladdius/node-js-server-image:version1.0).
4 Type Docker hub your credentials.
docker login
5 Push your image on hub docker.
docker push yourHubDockerUsername/yourImageName
in my case: docker push node-js-server-image:version1.0)
6 Run your image (it will pull from the hub if you don't it have on your host).
docker run -p mapping-port:nodejs-app-port --name your-custom-container-name -d yourImageName
in my case: docker run -p 4004:4002 --name node-server-container -d vladdius/node-js-server-image:version1.0)
Tip: on mac OS --name your-custom-container-name part is required.
7 Check your server in the browser.
http://localhost:`mapping-port`\
(http://localhost:4004)
Docker hub link of this image.
