Fixing Multi-Architecture Build Failures in Kubernetes CI/CD Pipelines
What's the problem?
Resolve '404 Not Found' errors in Kubernetes container builds by implementing dynamic architecture resolution via BuildKit ARG variables. Streamline your CI.
Why does this happen?
The build failure is caused by hardcoded architecture strings in the Dockerfile, which prevent the build engine from dynamically resolving the correct binary URL. Without defining the 'TARGETARCH' build argument, the environment lacks the necessary metadata to distinguish between amd64 and arm64 targets.
Code Example
# Define the build argument for the architecture
ARG TARGETARCH
# Use dynamic interpolation to resolve the correct binary URL
ADD https://github.com/coredns/coredns/releases/download/v1.5.0/coredns_1.5.0_linux_${TARGETARCH}.tgz /coredns.tgzHow to fix it
To enable seamless multi-architecture builds, you must update your Dockerfile to use dynamic variable injection. First, define the 'TARGETARCH' build argument at the top of your Dockerfile to surface the build environment's architecture. Second, replace the static placeholder in your 'ADD' or 'COPY' commands with the '${TARGETARCH}' variable, allowing the engine to map the URL path dynamically to the required platform-specific binary.