Study Group: 內湖成五 品質保證 docker-讀書會-04 volumes, Bind Mounts

Udemy

• Docker Mastery: with Kubernetes +Swarm from a Docker Captain

• GitHub: udemy-docker-mastery

• 講師的YouTube

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Section 5 Overview

• Defining the problem of persistent data
• Data Volumes
• Data Mounts

Container Lifetime & Persistent Data

• Containers are usually immutable and ephemeral
• Immutable infrastructure: only re-deploy containers, never change
• This is the ideal scenario, but what about databases, or unique data?
• Docker gives us features to ensure these separation of concerns
• This is known as persistent data
• Two ways: Volumes and Bind Mounts
• Volumes: make special location outsides of container UFS (union file system)
• Bind Mounts: link container path to host path

Container Lifetime & Persistent Data

• https://yuting3656.github.io/yutingblog//docker_mastery/docker-sections5-container-lifetime-persistent-data

Docker 工作現場 實戰寶典 pg. 142

docker create volume create datavol

docker volume ls

• ex:

docker container run -it --rm -v datavol:/data alpine

echo "This is a named volume demo" > /data/demo.txt

• 離開 alpine

docker container run --rm -v datavol:/data ubuntu cat /data/demo.txt

• inspect

docker volume inspect datavol

• 用 tree 看 (linux)

sudo tree -a /var/lib/docker/volumes/datavol

• 生活好涼拌

  • docker volume create -help
  • docker volume ls -help
  • docker volume inspect -help

Persisten Data Bind Mounting

• https://yuting3656.github.io/yutingblog//docker_mastery/docker-sections5-persistent-data-bind-mounting

• ex:

mkdir $HOME/data_share

echo "data sharing demo" > $HOME/data_share/demo.txt

docker container run --rm -v $(HOME)/data_share:/data ubuntu cat /data/demo.txt

udemy-docker-mastery/dockerfile-sample-2

• 練習: 把老師的 github clone 下來 binding dockerfile-sample-2/index.html 到 用 nginx 開啟的 container !

  • https://github.com/BretFisher/udemy-docker-mastery

    • https://github.com/BretFisher/udemy-docker-mastery/tree/master/dockerfile-sample-2

作業 Named Volumes and Bind Mounts

• https://yuting3656.github.io/yutingblog//docker_mastery/docker-sections5-hw-named-volumes-and-bind-mounts