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Docker通過從 Dockerfile讀取指令來自動編譯images, Dockerfile包含生成一個image所需要的所有命令集合,它是一個文檔,使用 docker build用戶可以持續執行一些命令行指令.
The docker
build command builds an image from aDockerfile and
a context.
The
build’s context is the files at a specified location PATH or URL.
--The PATH is
a directory on your local filesystem.
--The URL is
a the location of a Git repository.
Warning:
Do not use your root directory, /,
as thePATH as
it causes the build to transfer the entire contents of your hard drive to the Docker daemon.
the Dockerfile is called Dockerfileand
located in the root of the context. You use the -fflag
with docker build to point to
a Dockerfile anywhere in your file system.
$ docker build -f /path/to/a/Dockerfile .>指定一個
image的保存路徑
You can specify a repository and tag at which to save the new image if the build succeeds:
$ docker build -t shykes/myapp .
To tag the image into multiple repositories after the build, add multiple -t parameters
when you run the buildcommand:
$ docker build -t shykes/myapp:1.0.2 -t shykes/myapp:latest .Whenever
possible, Docker will re-use the intermediate images (cache), to accelerate the docker
buildprocess significantly. This is indicated by theUsing
cache message in the console output. (For more information, see the Build
cache section) in theDockerfile best
practices guide:
Docker
runs the instructions in a Dockerfile in
order.The first instruction must be `FROM` in
order to specify the Base
Image from which you are building.
"#" 是註釋符
轉義符( \ ) :
Escaping is possible by adding a \ before
the variable:\$foo or \${foo},
for example, will translate to$foo and ${foo} literals
respectively.
