MultipleInstructionsDisallowed （不允许的多个指令）

输出

Multiple CMD instructions should not be used in the same stage because only the last one will be used

描述

如果您的 Dockerfile 时，仅使用最后一个匹配项。镜像只能有一个、、和。CMDHEALTHCHECKENTRYPOINTCMDHEALTHCHECKENTRYPOINT

例子

❌ 差：重复说明。

FROM alpine
ENTRYPOINT ["echo", "Hello, Norway!"]
ENTRYPOINT ["echo", "Hello, Sweden!"]
# Only "Hello, Sweden!" will be printed

✅ Good：只有一条指令。ENTRYPOINT

FROM alpine
ENTRYPOINT ["echo", "Hello, Norway!\nHello, Sweden!"]

您可以同时为 Instruction（常规）、顶级和单独的指令。CMDCMDHEALTHCHECK

✅ Good：只有一个顶级指令。CMD

FROM python:alpine
RUN apk add curl
HEALTHCHECK --interval=1s --timeout=3s \
  CMD ["curl", "-f", "http://localhost:8080"]
CMD ["python", "-m", "http.server", "8080"]