Docker: failed to export iamge: failed to create image: failed to get layer_failed to get layer for image sha256:6997b3ab52293-优快云博客

在Docker多阶段构建过程中遇到'failedtogetlayer'错误时，可以通过在连续的COPY指令之间插入RUN true来解决。此方法能够确保每个COPY操作之间进行一次最小的系统交互，避免潜在的文件系统缓存问题。

Docker: failed to export iamge: failed to create image: failed to get layer

概述

在执行docker多阶构建的时候，偶尔会出现 failed to get layer 的错误

dockerfile

## 仅供参考，不一定触发场景
FROM alpine:latest
WORKDIR /data/release
COPY ./nginx-1.16.1.tar.gz ./
COPY ./test.tar.gz ./
COPY ./test_2.tar.gz ./
COPY ./test_3.tar.gz ./
RUN apk add openssl curl ca-certificates make libffi-dev openssl-dev libtool && tar -zxf ./nginx-1.16.1.tar.gz && cd nginx-1.16.1 && make install

failed to export iamge: failed to create image: failed to get layer

解决

在多结构件镜像的过程中，在某些特殊情况下，会出现该错误，可通过在错误的COPY之间添加 RUN true 解决

## 仅供参考，不一定触发场景
FROM alpine:latest
WORKDIR /data/release
COPY ./nginx-1.16.1.tar.gz ./
RUN true
COPY ./test.tar.gz ./
RUN true
COPY ./test_2.tar.gz ./
RUN true
COPY ./test_3.tar.gz ./
RUN true
RUN apk add openssl curl ca-certificates make libffi-dev openssl-dev libtool && tar -zxf ./nginx-1.16.1.tar.gz && cd nginx-1.16.1 && make install