# DOCKER NOTES ###### tags: `SA` ![](https://i.imgur.com/M5dl9L5.png) ## WHAT'S DOCKER https://www.youtube.com/watch?v=rOTqprHv1YE ### Conatiners : The industry standard today is to use Virtual Machines (VMs) to run software applications. VMs run applications inside a guest Operating System, which runs on virtual hardware powered by the server’s host OS. VMs are great at providing full process isolation for applications: there are very few ways a problem in the host operating system can affect the software running in the guest operating system, and vice-versa. But this isolation comes at great cost — the computational overhead spent virtualizing hardware for a guest OS to use is substantial. Containers take a different approach: by leveraging the low-level mechanics of the host operating system, containers provide most of the isolation of virtual machines at a fraction of the computing power. ## DOCKER INSTALL * Install ``` sudo apt install curl curl -fsSL "https://get.docker.com/" | sh ``` * Start docker service ``` sudo systemctl start docker ``` * Optional: To use Docker as a non-root user, you should add your user to the "docker" group ``` sudo usermod -aG docker [your_username] ``` <br> ## DOCKER USAGE ### run ubuntu cotainer ( the begining ) ``` docker run -ti ubuntu bash ``` ### detach docker (can still be attach later) ``` press Ctrl+P and Ctrl+Q ``` ### attach docker (id is the first six or seven predix) ``` docker exec -ti [id] bash ``` ### start container ``` docker start [id] ``` ### stop container ``` docker stop [id] ``` ### list all container ``` docker ps ``` ### remove specific container ``` docker rm [id] ``` ### remove specific image ``` docker rmi [id] ``` ### rename a conatiner ``` sudo docker rename oldname newname ``` ### copy a file from container to host ``` docker cp <containerId>:/file/path/within/container /host/path/target ``` <br> ## DOCKER FILE TUTORIAL 1. set up a file name : Dockerfile (not folder) 2. edit the Dockerfile - Basic Format of Dockerfile : - FROM : always start by FROM. Specify which basic docker image (parent image) - RUN : run the command in the client - COPY: copy executes on the host into container (client) - CMD : command to run the final program (intial command) - more reference : [docker offical website](https://docs.docker.com/engine/reference/builder/#environment-replacement) 3. bult the docker image ``` docker build -t image_name:version location ``` 4. Run the image ``` docker run -ti image bash ``` Example : ```dockerfile FROM ubuntu:18.04 RUN mkdir -p /home/app RUN apt-get update && apt-get install -y --no-install-recommends \ python3.5 \ python3-pip \ && \ apt-get clean && \ rm -rf /var/lib/apt/lists/* COPY . /home/app CMD ["python3","main.py"] ``` ## DOCKER HUB Docker Hub 如同 Github。Github上 有許多的專案，每個人都可以上傳自己的專案，也可以下載別人的專案，有時也可以在某些開源專案，提問或提交自己的程式碼。同時，Github 也提供私有與公開的專案類型，如果專案不想被公開，則需要申請付費帳號。而 Docker Hub 則提供免費帳號一個私有 Repository 的 quota。 ## PUSH IMAGE TO DOCKER HUB [reference](https://ithelp.ithome.com.tw/articles/10191139) ``` docker tag ${Image Name:tag} DockerHub_account/Image_Name docker login docker push DockerHub_account/Image_Name ``` ## CMD FOR GUI ``` docker run --rm -ti --runtime=nvidia --net=host -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=$DISPLAY --volume="$HOME/.Xauthority:/root/.Xauthority:rw" -e XDG_RUNTIME_DIR=$XDG_RUNTIME_DIR chentzj/open_pose:01 ```