CODEWITHSUNDEEP
dockerdockerfile
BhagyaKolitha Jayalath
BhagyaKolitha Jayalath

Reputation: 103

How to check if I am writing the right Dockerfile

I know this question would look silly.

But I am new to the Docker and kinda ambiguous about how to write a proper Docker file

Docker file depends on what we are deploying on the container (PHP, nginx, node, etc.)

pulling an image is okay. But How do we exactly know what CMD should be run and what PATH should be given?

Some Dockerfiles don't need a CMD part. Some need PATH and some don't. How do we exaclt know this? Can we see this if we clicked on a tag in docker hub? I can see there is a Dockerfile for each tag. But that is a complex Dockerfile

How do we exactly know which syntaxes (i.e. PATH, CMD etc...) should write in the Dockerfile to make the deployment work?

Upvotes: 0

Views: 3004

Answers (1)

Efrat Levitan
Efrat Levitan

Reputation: 5612

most of this just come along with your knowledge and experience around the base image ecosystem.

Nevertheless, as @rahultyagi stated, search the documentation of your language for Dockerfile examples. most modern libs and frameworks come with an official Dockerfile you can refer to as your base image, and an example Dockerfile you can copy and tweak for your app.

a great tool ive recently run into is called hadolint and its kind of a linter for your dockerfiles. it also got an online version you can try: https://hadolint.github.io/hadolint/

my final own tip is to make as much dummy dockerfiles as you can on your free time, for tools and libraries you run into, until you get the hang of it.

Cheers & Good Luck!

Upvotes: 2

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