node.js - 使用 docker 时如何加快 CI 构建时间？

Question

我目前使用 docker + travis CI 来测试/部署我的应用程序。这在本地非常有效，因为我有 node_modules 等数据量，并且 docker 的层提供缓存加速构建。

但是，当我将代码推送到 travis 时，它必须从头开始重建和安装所有内容，这需要很长时间! Travis 不支持缓存 docker 层 atm。有没有其他方法可以加快我的构建速度，或者是否有其他类似的工具允许 docker 层缓存？

Answer 1

您可能想调查如何 i3wm已经解决了类似的问题。

主要开发人员在 design behind his Travis CI workflow 上写过.引用相关部分:

The basic idea is to build a Docker container based on Debian testing and then run all build/test commands inside that container. Our Dockerfile installs compilers, formatters and other development tools first, then installs all build dependencies for i3 based on the debian/control file, so that we don’t need to duplicate build dependencies for Travis and for Debian.

This solves the immediate issue nicely, but comes at a significant cost: building a Docker container adds quite a bit of wall clock time to a Travis run, and we want to give our contributors quick feedback. The solution to long build times is caching: we can simply upload the Docker container to the Docker Hub and make subsequent builds use the cached version.

We decided to cache the container for a month, or until inputs to the build environment (currently the Dockerfile and debian/control) change. Technically, this is implemented by a little shell script called ha.sh (get it? hash!) which prints the SHA-256 hash of the input files. This hash, appended to the current month, is what we use as tag for the Docker container, e.g. 2016-03-3d453fe1.

See our .travis.yml for how to plug it all together.