ENTRYPOINT 的作用和用法和 CMD 一模一样,但是 ENTRYPOINT 有和 CMD 有 2 处不一样: CMD 的命令会被 Docker run 的命令覆盖而 ENTRYPOINT 不会; ENTRYPOINT 指令的优先级高于 CMD 指令。CMD 和 ENTRYPOINT 都存在时,CMD 的指令变成了 ENTRYPOINT 的参数,两者拼接之后,才是最终执行的命令。并且此 CMD 提供的参...
1. RUN 2. RUN ["executable", "param1", "param2"] 第一种后边直接跟shell命令 在linux操作系统上默认 /bin/sh -c 在windows操作系统上默认 cmd /S /C 第二种是类似于函数调用。 可将executable理解成为可执行文件,后面就是两个参数。 两种写法比对: RUN /bin/bash -c 'source $HOME/.bashrc; e...
Step 1/4 : FROM alpine:3.2--->31f630c65071Step 2/4 : MAINTAINER SvenDowideit@home.org.au--->Using cache--->2a1c91448f5fStep 3/4 : RUN apk update && apk add socat && rm -r /var/cache/--->Using cache--->21ed6e7fbb73Step 4/4 : CMD env | grep _TCP= | (sed 's/.*...
The RUN, CMD, and ENTRYPOINT instructions all have two possible forms: INSTRUCTION ["executable","param1","param2"] (exec form) INSTRUCTION command param1 param2 (shell form) The exec form makes it possible to avoid shell string munging, and to invoke commands using a specific command shell...
If you listmore than oneCMD, only the last one takes effect. So if you have multiple commands to run, you better write them in a script file. Docker is not the VMware, there is nosystemdin the container. Its startup program is the container application process. The container exists for...
1)shell格式的将会拒绝任何CMD或者run命令行的参数,将以/bin/sh -c开头,只有exec格式的才可以在命令行中使用--entrypoint进行覆盖。 2)Dockerfile中只有最后一个ENTRYPOINT有效。 3)同RUN,exec格式中ENTRYPOINT [ "echo", "$HOME" ]无效,需要指定sh -c,如使用ENTRYPOINT [ "sh", "-c", "echo $HOME" ]...
If you listmore than oneCMD, only the last one takes effect. So if you have multiple commands to run, you better write them in a script file. Dockeris not the VMware, there is nosystemdin the container. Its startup program is the container application process. The container exists for ...
RUN Executes any commands in a new layer on top of the current image and commits the result.RUNalso has a shell form for running commands. WORKDIR <directory>Sets the working directory for anyRUN,CMD,ENTRYPOINT,COPY, andADDinstructions that follow it in the Dockerfile. COPY <src...
$ docker build -t test/myapp .Sending build context to Docker daemon 2.048 kBError response from daemon: Unknown instruction: RUNCMDDocker守护程序以Dockerfile一对一的方式运行指令,如有必要,将每个指令的结果提交到新映像,然后最终输出新映像的ID。Docker守护程序将自动清理您发送的上下文。
RUN :shell形式,命令在shell中运行,默认在Linux上使用/bin/sh -c,在Windows上使用cmd /S /C。 RUN ["程序名","param1","param1"]:exec形式,不会触发shell,所以$HOME这样的环境变量无法使用,但它可以在没有bash的镜像中执行。 说明: 可以使用反