了解 Docker 中的入口点标志
我们在 docker run 命令中使用入口点 (--entrypoint) 标志来指定启动 Docker 容器时要执行的命令。 该标志允许我们自定义容器的行为并确定 Docker 将预先运行的命令。
本文将概述入口点指令以及 Docker 在运行 docker run 命令时使用它。
了解入口点指令
默认情况下，Docker 容器的入口点是用于构建映像的 Dockerfile 中的 CMD 指令。 CMD 指令指定了 Docker 在启动容器时执行的默认命令。
例如，以下 Dockerfile 将图像的默认入口点定义为 echo 命令。
FROM ubuntu:18.04
CMD ["echo", "Hello, World!"]
我们可以使用 docker build 和 docker run 命令来构建镜像并运行基于镜像的容器。
示例代码：
docker build -t my-image .
docker run my-image
在此示例中，docker run 命令将基于 my-image 映像启动一个容器，并执行 echo 命令作为容器的入口点。 上面的命令将打印“Hello, World!” 消息到控制台。
但是，如果我们想为容器指定一个不同的入口点，我们可以在运行 docker run 命令时使用 --entrypoint 选项。
示例代码：
docker run --entrypoint /bin/sh my-image:latest
使用入口点标志传递参数
在此命令中，**--entrypoint** 选项将容器的入口点指定为 /bin/sh 命令。 此命令会覆盖 Dockerfile 中指定的默认入口点。
当 Docker 启动容器而不是 Dockerfile 中定义的 CMD 时，它会导致 /bin/sh 执行命令。
除了指定容器的入口点外，我们还可以使用入口点标志将参数传递给入口点命令。
示例代码：
docker run --entrypoint /bin/sh my-image:latest -c
docker run --entrypoint 命令使用以下语法。
docker run --entrypoint <entrypoint.sh> <image:tag> <arg1> <arg2> <arg3>
总结
我们使用 --entrypoint 标志执行命令，以帮助在启动的容器上指定默认命令 shell。 Docker 使用它来自定义容器的行为并在首次使用时运行特定的命令或脚本。
在生产环境中运行容器时，此标志会很方便，您可能希望确保容器始终启动并执行特定命令。
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