RUN echo "\ndaemon off;" >> /etc/nginx/nginx.conf#Commands when creating a new containerCMD /usr/sbin/nginx 其中,一开始必须指明【所基于的镜像名称】,接下来一般是说明维护者信息,后面则是镜像操作指令,例如 RUN 指令,RUN 指令将对镜像执行跟随的命令。每运行一条 RUN 指令,镜像就添加新的一层,并提...
Unlike theshellform, theexecform does not invoke a command shell. This means that normal shell processing does not happen. For example,CMD [ "echo", "$HOME" ]will not do variable substitution on$HOME.If you want shell processing then either use theshellform or execute a shell directly, f...
1)Dockerfile中若有多个CMD,则只有最后一个CMD有效。 2)当CMD为ENTRYPOINT提供默认参数时,CMD和ENTRYPOINT都需要以JSON数组格式进行声明。 3)同ENTRYPOINT,exec格式中CMD [ "echo", "$HOME" ]无效,需要指定sh -c,如使用CMD [ "sh", "-c", "echo $HOME" ],当然,也可以直接使用shell格式:CMD echo $HOME...
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...
CMD是容器启动时执行的命令,在构件时并不运行,构件时紧紧指定了这个命令到底是个什么样子 LABEL 功能是为镜像指定标签 语法: LABEL <key>=<value> <key>=<value> <key>=<value> ... 一个Dockerfile种可以有多个LABEL,如下: LABEL "com.example.vendor"="ACME Incorporated"LABEL com.example.label-with-valu...
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...
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 ...
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...
$ 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。
CMD ["exec","param1","param2"]:使用exec执行,推荐方式。 CMD command param1 param2:在/bin/sh中执行,可以提供交互操作。 CMD ["param1","param2"]:提供给ENTRYPOINT的默认参数(极少这样使用)。 五、EXPOSE EXPOSE指令通知容器在运行时监听某个端口,可以指定TCP或UDP,如果不指定协议,默认为TCP端口。但是...