Why is my Go Docker application on Kubernetes throwing a \'no such file or directory\' error related to time zone information?

Creating Binaries with Time Zone Information

When deploying a Docker container application to a Kubernetes engine, you may find yourself facing an error message about a missing zoneinfo.zip file. To resolve this issue and ensure your application initializes correctly, this question-and-answer article provides a detailed solution.

Question:

Why do I encounter a "no such file or directory" error when attempting to use the time/zoneinfo package in a Docker container application deployed on a Kubernetes engine?

Answer:

The error message indicates that your container image is unable to locate the zoneinfo.zip file, which contains time zone information. To address this issue, consider utilizing Go version 1.15 or later, as it includes a new tzdata package.

Solution:

Option 1: Go Version 1.15

• Build your Go application with Go 1.15 or a subsequent version.
• This action embeds the time zone database into your program, eliminating the need to load it from the local system.
• By including the tzdata package, your program will always have access to time zone information, even in environments where it is not readily available.

Option 2: Build with -tags timetzdata (Go 1.14 and Earlier)

• Build your Go application with the -tags timetzdata flag.
• This flag also embeds the time zone database into your program, providing the same functionality as Option 1.
• Both methods increase the size of your program by approximately 800 KB.

Additional Considerations:

• Using Go 1.15 has a drawback, in that the time zone information version is tied to the Go version used for building.
• To ensure the availability of up-to-date time zone information, consider periodically updating the Docker image.

In summary, by using Go version 1.15 or later, or by building with -tags timetzdata, you can embed time zone information into your Go application, resolving the error you encountered.

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