24.7. 追蹤多追蹤多部機器

Contributed by Mike Meyer.

當有多部機器需要追蹤同一個原始碼樹, 會浪費磁碟空間,網路頻寬,和 中央處理器周期來讓每個系統下載原始碼和編譯所有東西。 解決方法是有解決方法是有一台機器做大部份的工作,剩下的機器經由 NFS來掛載這個工作。這一節概述了一個如此做的方法。 更多關於使用 NFS的資訊,請參考節 29.3, “Network File System (NFS)”

First, identify a set of machines which will run the same set of binaries, known as a build set. Each machine can have a custom kernel, but will run the same userland binaries. From that set, choose a machine to be the build machine that the world and kernel are built on. Ideally, this is a fast machine that has sufficient spare CPU to run make buildworld and make buildkernel.

Select a machine to be the test machine, which will test software updates before they are put into production. This must be a machine that can afford to be down for an extended period of time. It can be the build machine, but need not be.

All the machines in this build set need to mount /usr/obj and /usr/src from the build machine via NFS. For multiple build sets, /usr/src should be on one build machine, and NFS mounted on the rest.

Ensure that /etc/make.conf and /etc/src.conf on all the machines in the build set agree with the build machine. That means that the build machine must build all the parts of the base system that any machine in the build set is going to install. Also, each build machine should have its kernel name set with KERNCONF in /etc/make.conf, and the build machine should list them all in its KERNCONF, listing its own kernel first. The build machine must have the kernel configuration files for each machine in its /usr/src/sys/arch/conf.

On the build machine, build the kernel and world as described in 節 24.6, “重新編譯 World”, but do not install anything on the build machine. Instead, install the built kernel on the test machine. On the test machine, mount /usr/src and /usr/obj via NFS. Then, run shutdown now to go to single-user mode in order to install the new kernel and world and run mergemaster as usual. When done, reboot to return to normal multi-user operations.

After verifying that everything on the test machine is working properly, use the same procedure to install the new software on each of the other machines in the build set.

The same methodology can be used for the ports tree. The first step is to share /usr/ports via NFS to all the machines in the build set. To configure /etc/make.conf to share distfiles, set DISTDIR to a common shared directory that is writable by whichever user root is mapped to by the NFS mount. Each machine should set WRKDIRPREFIX to a local build directory, if ports are to be built locally. Alternately, if the build system is to build and distribute packages to the machines in the build set, set PACKAGES on the build system to a directory similar to DISTDIR.

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