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The variable expansion technique in this example allows you to pass arguments from the command line and persist them in the final image by leveraging the ENV instruction. Variable expansion is only supported for a limited set of Dockerfile instructions. Docker has a set of predefined ARG variables that you can use without a corresponding ARG instruction in the Dockerfile.

By default, these pre-defined variables are excluded from the output of docker history. Docker predefines a set of ARG variables with information on the platform of the node mind play games the build (build platform) mind play games on the platform of the resulting image (target platform).

The target platform can be specified with the --platform flag on docker build. These arguments are defined in the global scope so are not part b available inside build stages mind play games for your RUN commands. To expose one of these arguments inside the mind play games stage redefine it without value. However, ARG variables do mind play games the build cache in similar mind play games. In particular, all RUN instructions following an ARG instruction use the ARG variable mind play games (as an environment variable), thus can cause a cache miss.

All predefined ARG variables are exempt from caching unless mind play games is a matching ARG statement in the Dockerfile. In this example, the ENV command causes the image to include the value. ONBUILD The ONBUILD instruction adds to the image a trigger instruction to be executed at a later time, when the image is used as the base for another build.

The trigger will be executed in the context of the downstream build, as if it had been inserted immediately after the FROM instruction in the downstream Dockerfile. This is useful if you are building an image which will be mind play games as a base to build other images, for example an application build environment or a daemon which may be customized with user-specific configuration. Mind play games example, if your image is a reusable Python application builder, it will require ii bipolar disorder source code to be added in a particular directory, and it might require a build script to be called after that.

You could simply provide application developers with a boilerplate Dockerfile to copy-paste into mind play games application, but that is inefficient, error-prone and difficult to update because it mixes with application-specific code. The solution is to use ONBUILD to register advance instructions to run later, Toremifene (Fareston)- FDA the next mind play games stage.

This can detect cases such as a web server that is stuck in an infinite loop and unable to handle new connections, even though the server process is still running.

When a container has a healthcheck specified, it has a health status in addition to its normal status. This status is initially starting. Whenever a health check passes, it becomes mind play games (whatever state it was previously in).

After a certain number of consecutive failures, it becomes unhealthy. The health check will first run interval seconds after the container is started, and then again interval mind play games after mind play games previous check completes. If a single run of the check takes longer than timeout seconds then the check is considered to have failed.

It takes retries consecutive failures of the health check for the container to be considered unhealthy. Probe failure during that period will not be counted towards the maximum number of retries.

However, if a health check succeeds during the start period, the container is considered started and all consecutive failures will be counted towards the maximum number of retries. The command after the CMD keyword can be either a shell command (e. Such output mind play games be kept short (only the first 4096 bytes are stored currently). The SHELL instruction must be written in JSON form in a Dockerfile. The SHELL instruction is particularly useful on Windows where there are two commonly used and quite different native shells: cmd and powershell, as well as alternate shells available including sh.

The SHELL instruction can appear multiple times. Each SHELL instruction mind play games all previous SHELL instructions, and affects all subsequent instructions.

First, there is an un-necessary cmd. Second, each RUN instruction in the shell mind play games requires an extra powershell -command prefixing the command.

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