45 lines
2.2 KiB
Markdown
45 lines
2.2 KiB
Markdown
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# Working with Dockerfiles (.NET, Golang, Python, NodeJS)
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## Three Problems for docker beginner
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1. Programmer need be able to navigate through windows/mac/linux OS using cmd line fluently:
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1. `ls/dir` for list files
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2. `cd` for move through file systems
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2. Working Directories
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1. Show current working directory `echo $PWD`
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2. Don't hardcode path to file in docker files
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3. Understand *docker volume* `docker run -v hostPath:containerPath`
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1. e.g. `docker run -it -v $PWD:/work -w /work alpine:3.9 /bin/sh`
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## dockerfile
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Before bring up docker container, we need first create `dockerfile` to describe the image that we want to use to create containers.
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For different languages, `c#`, `golang` & `python` each has a separate dockerfile. Each describe the complete environment can be used to develop corresponding programs
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## Docker compose
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`Compose` is an **orchestration** tool that used to spinning up multi-container distributed applications, it shipped with Docker by default. It's not ideal for large system setup, but great for development purpose and testing
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It's easy to define a multi-container app and accompanying services using **one single file**, and start it using single command. We can also build/push images to registry using `docker-compose`
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The compose file is `docker-compose.yaml` in PWD
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* Build image individually: `docker-compose build <service_name>`
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* Build all images: `docker-compose build`
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### Create & Push images built from docker-compose
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1. Create image using `docker-compose.yaml` & `Dockerfile`
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1. Write `Dockerfile` and `docker-compose.yaml`
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2. Create image: `docker-compose build first-public-dockerhub-image` where
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1. `first-public-dockerhub-image` is the service name of the image
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2. Login Docker hub
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1. `docker login`, without specify server address, it automatically connect to DockerHub
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2. Enter Username & Password
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3. Now computer has login DockerHub successfully
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3. Go to Docker hub, create the `first-public-dockerhub-image` repository
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4. Go to command line, push the image `docker push cruxligh/first-public-dockerhub-image`
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References:
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1. How to register a dockerhub registry: [Docker Hub QuickStart](https://docs.docker.com/docker-hub/)
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