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47 lines
1.1 KiB
Markdown
47 lines
1.1 KiB
Markdown
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# Keywords
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## FROM (module)
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* gives instructions about the base platform to use (node, fedora, etc)
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- `FROM node:20`
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## WORKDIR (path)
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* like when you `cd` into a directory
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* makes sure any commands executed will be in this directory
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- `WORKDIR /app`
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## COPY (src) (dest)
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* copies files from `src` to `dest`
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* I THINK it's like a symbolic link? Maybe?
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- `COPY package*.json ./`
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*Note: you can get docker to ignore files by creating a `.dockerignore` file*
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## RUN (commands)
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* like running a command in the terminal!
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* `RUN npm install`
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## ENV ((varName=varVal) (varName2=varVal2) ...)
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* sets env vars (like doing it from the command line)
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- `ENV PORT=3000`
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## EXPOSE (PORT)
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* this will expose a port to the network
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- `EXPOSE 3000`
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## CMD (args[])
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* only ONE per dockerfile
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* will tell the container how to run the application
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* same as nodejs `spawn` args
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- `CMD ["npm", "start"]`
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# Notes
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every step/instruction in docker is it's own layer
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- docker attempts to cache layers if nothing is changes
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- this means we want to install dependancies first so they aren't re-installed every time (i.e. are cached)
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