环境变量(用ENV语句声明)也可以在某些指令中用作由 Dockerfile 解释的变量。转义也可以通过将类似变量的语法实际包含在语句中来进行处理。 Environment variables are notated in theDockerfileeither with$variable_nameor${variable_name}. They are treated equivalently and the brace syntax is typically used to a...
ENVMY_VAR my-value This syntax does not allow for multiple environment-variables to be set in a singleENVinstruction, and can be confusing. For example, the following sets a single environment variable (ONE) with value"TWO= THREE=world": 这种语法不允许在单个ENV指令中设置多个环境变量,这可能会...
You can also use environment variables with RUN, CMD, and ENTRYPOINT instructions, but in those cases the variable substitution is handled by the command shell, not the builder. Note that instructions using the exec form don't invoke a command shell automatically. See Variable substitution. ...
Bootstrapping the container with a PowerShell script to promotes environment variables gives you fine control over how you start your containers (this example also includes the custom IIS logging setup from Dockerfile #13). If you don’t need a custom setup, the logic to make environment varia...
--env-file filename #Read in a file of environment variables 示例:两种格式功能相同 #格式1 ENV myName="john Doe" myDog=Rex The\ Dog \ myCat=fluffy #格式2 ENV myName John Doe ENV myDog Rex The Dog ENV myCat fluffy 范例: ENV VERSION-1.0 DEBUG-on NAME-"Happy Feet ...
Environment replacement Environment variables (declared withthe ENV) can also be used in certain instructions as variables to be interpreted by theDockerfile. Escapes are also handled for including variable-like syntax into a statement literally.Environment variables are notated in theDockerfileeither wit...
对于容器链接,Docker 为从服务容器返回到源的路径(即MYSQL_PORT_3306_TCP)提供环境变量。(原文:For container linking, Docker provides environment variables for the path from the recipient container back to the source (ie, MYSQL_PORT_3306_TCP).)...
转义也被用作将类变量语法逐字逐句的包含到声明中。(Environment variables (declared with the ENV statement) can also be used in certain instructions as variables to be interpreted by the Dockerfile. Escapes are also handled for including variable-like syntax into a statement literally.)...
If your application uses environment variables, you can set environment variables in your Docker build using theENVinstruction. ENVFLASK_APP=hello This sets a Linux environment variable we'll need later. Flask, the framework used in this example, uses this variable to start the application. Withou...
# set environment variables ENV JAVA_HOME /usr/local/java/jdk ENV JRE_HOME ${JAVA_HOME}/jre ENV CLASSPATH .:${JAVA_HOME}/lib:${JRE_HOME}/lib ENV PATH ${JAVA_HOME}/bin:$PATH 根据Dokcerfile创建新镜像: # 注意后边的 . 不能忘了 ...