When and Why Should I Use `go mod vendor`?

Exploring the Purpose of the 'go mod vendor' Command

Despite the introduction of Go Modules, certain scenarios arise where the 'go mod vendor' command becomes imperative. While Go Modules manages dependency versioning, it does not completely eliminate the risk of dependency availability issues. If a module disappears from the Internet or if internet access is unavailable, the code may fail to build.

The 'go mod vendor' command addresses this challenge by creating a 'vendor' directory in the main module's root directory. This directory contains copies of all necessary packages, ensuring that dependencies are readily available without relying on external downloads.

By checking the 'vendor' directory into version control systems (VCS), developers can avoid the need to download dependencies at runtime, as they are already present within the vendor folder. This approach is particularly beneficial for large-scale server farms that require multiple machines to run the same code. Instead of downloading dependencies individually for each machine, organizations can leverage the 'go mod vendor' command to create a localized repository and distribute it internally, optimizing efficiency and minimizing security risks.

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