How to Avoid 'Cannot locate specified Dockerfile' Errors When Building Docker Images from Go Code?

Build Docker Image from Go Code with Absolute Path

When building a Docker image from Go code using the Docker API and Docker Go libraries, issues may arise when specifying the Dockerfile path. To resolve the "Cannot locate specified Dockerfile" error, it is crucial to ensure that the provided path is absolute.

In the provided code snippet, the Dockerfile field in ImageBuildOptions was set to a relative path, which is not recommended. Instead, use the absolute path to the Dockerfile to avoid potential errors. For example:

opt := types.ImageBuildOptions{
    CPUSetCPUs:   "2",
    CPUSetMems:   "12",
    CPUShares:    20,
    CPUQuota:     10,
    CPUPeriod:    30,
    Memory:       256,
    MemorySwap:   512,
    ShmSize:      10,
    CgroupParent: "cgroup_parent",
    Dockerfile:   "/path/to/Dockerfile",
}

By specifying the absolute path, the Docker API can accurately locate the Dockerfile and proceed with the image build process as expected. This approach ensures that the build operation is successful and eliminates the "Cannot locate specified Dockerfile" error.

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