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使用指南
构建包不成功留下一堆废镜像和容器<none>如何清理？
https://blog.csdn.net/catoop/article/details/91908719
疑难杂症
问题：Dockerfile构建镜像，旧文件一点没动，结果执行到apt各种包会报找不到。returned a non-zero code: 100
W: Failed to fetch http://mirrors.163.com/ubuntu/dists/bionic/InRelease Temporary failure resolving 'mirrors.163.com'
W: Failed to fetch http://mirrors.163.com/ubuntu/dists/bionic-updates/InRelease Temporary failure resolving 'mirrors.163.com'
W: Failed to fetch http://mirrors.163.com/ubuntu/dists/bionic-backports/InRelease Temporary failure resolving 'mirrors.163.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package net-toolsThe command '/bin/sh -c apt-get update && apt-get install net-tools -y && apt-get install iputils-ping -y && apt-get install vim -y && apt-get autoclean && apt-get autoremove' returned a non-zero code: 100
解决：都说加源，对我一点用都不管。最后是这个起作用了。
可能是docker的dns有问题。https://zhuanlan.zhihu.com/p/422089996
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