{"version":"1.0","provider_name":"Docker-Profis","provider_url":"https:\/\/dockerpros.com\/de","title":"Docker Build Args - Dockerpros","type":"rich","width":600,"height":338,"html":"
Docker Build Args\n\nBuild Args are used to pass build-time variables to the Docker build process. They are defined in the Dockerfile using the `ARG` instruction and can be used to customize the build process or provide values for environment variables.\n\nHere's an example of how to use Build Args in a Dockerfile:\n\n```dockerfile\nFROM ubuntu:latest\n\nARG MY_VAR\n\nRUN echo \"The value of MY_VAR is: $MY_VAR\"\n```\n\nIn this example, we define a Build Arg called `MY_VAR` using the `ARG` instruction. We can then use this variable in the `RUN` instruction to print its value.\n\nTo pass a value for the Build Arg when building the Docker image, we use the `--build-arg` flag with the `docker build` command:\n\n```bash\ndocker build --build-arg MY_VAR=my_value -t my_image .\n```\n\nIn this command, we pass the value `my_value` for the `MY_VAR` Build Arg. The resulting Docker image will have the value of `MY_VAR` set to `my_value`.\n\nBuild Args can be useful in various scenarios, such as:\n\n1. Passing configuration values to the build process.\n2. Customizing the build process based on different environments (e.g., development, staging, production).\n3. Providing secrets or sensitive information during the build process (although it's recommended to use Docker secrets or environment variables for this purpose).\n\nIt's important to note that Build Args are only available during the build process and are not persisted in the final Docker image. If you need to use the values in the running container, you should use environment variables instead.\n\nBuild Args provide a flexible way to customize the Docker build process and pass values to the build instructions. They can be used in combination with other Dockerfile instructions to create dynamic and configurable Docker images.<\/a><\/blockquote>