Gentoo 的 overlay 是 Gentoo 用户把自己书写的 ebuild 提交给官方的项目，现在我们一般都在使用 layman 来管理。它可以让你在同一台机器丰轻松地使用与同步多个 Portage overlay。 所以我们在使用 overlay 前要先安装 layman： $ sudo emerge -av layman 然后将把这些 overlay 加入到你的 PORTDIR_overlay 变量中： $ echo "source /usr/portage/local/layman/make.conf" | sudo tee -a /etc/make.conf 现在，你会发现你还没有...

overlay Network又称为覆盖网络、重叠网络、叠加网络。 overlay Network定义： An overlay network is a computer network which is built on top of another network. Nodes in the overlay can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. For example, many peer-to-peer networks are overlay...

在gentoo dev manual上overlay这一章中写道： Portage can look in multiple places for packages by using an overlay. The locations of overlays are controlled by the PORTDIR_overlay variable, which should contain a space-separated list of paths. The overlay should contain the same directory structure as PORTDIR (although only the necessary directories need be included). For example, a simple overla...