9vx tutorial: running a cpu server from kfs (RFC)

原文：http://groups.google.com/group/comp.os.plan9/browse_thread/thread/2db7a483a46f9acd

【说明】

本文是yiyus发布在9fans上的一篇教程。文中用到的9vx是yiyus维护的分支：http://bytebucket.org/yiyus/vx32/overview。根据yiyus在9fans中的说明，他的9vx分支是从ron的分支上更改的。vx32/9vx的创始人Russ Cox最近在9fans中声明他本人已经放弃了对9vx的维护，准备将所有权限转交给ron minnich（八卦一下：Russ Cox现在是Google Go语言的核心成员之一，正与Rob Pike，Ken Tompson等原plan9的元老一起维护Go……）。

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9vx tutorial:running a cpu server from kfs (RFC)

This tutorial is a work in progress (it will eventually be added tothe 9vx documentation and probably to the Plan 9 wiki). Please let meknow if you see anything I'm doing wrong (unfortunately I don't havetoo much experiencewith real Plan 9 systems of more than onemachine). In particular, I don't know why I could not use mkfs insteadof dircp. The line

% disk/mkfs -s /n/9660 /sys/lib/sysconfig/proto/allproto

gave me this error:

mkfs: /sys/lib/sysconfig/proto/allproto:1: can't move tmp file to/n/kfs/dist/replica/plan9.compressed.db: wstat -- unknown type/mode

Anyway, these instructions are working here. Please, let me know ifthey work for you too.

By the way, this tutorial is only the first one, but I'd like to havesome more. For example, to run several 9vx instances in a privatenetwork using the tap device and to run 9vx from fossil backed up byp9p's venti. Contributions are welcomed ;-)

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This is a brief tutorial on how to run a 9vx cpu server from a kfsfile system. You will need 9vx, a plan9.iso and some free disk space.

First, go to the destination directory and install 9vx:

$ hg clone http://bitbucket.org/yiyus/vx32/ $ cd vx32/src/ $ make 9vx/9vx && sudo make 9vx/install

(Commands run on the host are preceded by $, commands run from inside9vx are preceded with %)

You can check that 9vx is working running the minimal system embeddedin the executable. The rcvx script should take you to a vx32% rcprompt in the current directory. Once you have played a bit with arootless 9vx type exit to go back to your host system.

rcvx is cool but you will want a full Plan 9 tree to have real fun.

Let's boot from the iso file:

$ 9vx -r plan9.iso -u glenda "CWD=#Z`pwd`" "nvram=#Z`pwd`/plan9.nvr"

You should be in rio now, have an acme and a rio window, stats,faces... This is the live system in the iso that you probably alreadyknow. The CWD=... and nvram=... arguments are interpreted as plan9.inilines and passed as environment variables, we will use them later.

Open a new rio window:

% cd $CWD % dd -if /dev/random -of plan9.nvr -bs 512 -count 1 % dd -if /dev/zero -of plan9.kfs -bs 1024 -count 320000

Those files will be our nvram and kfs partitions (check the size ofyour kfs file, 320Mb is not too much, but will be enough). Nvram needsto be initialized:

% auth/wrkey authid: bootes authdom: 9vx secstore key: password:

We can populate the file system now:

% 9660srv -f plan9.iso % 9fs 9660 % disk/kfs -f plan9.kfs File system main inconsistent Would you like to ream it (y/n)? y % 9fs kfs % dircp /n/9660 /n/kfs

The system is now installed. You should be able to open a new 9vxinstance from your new root:

$ 9vx "nvram=#Z`pwd`/plan9.nvr" -r plan9.kfs -u glenda

You can also boot a cpu server. We will use the canopenpath option, sothat only the files which begin with `pwd`/plan9 can be opened from9vx, the -ic flags tell 9vx to pass -c to /386/init:

$ 9vx -gic -r plan9.kfs "nvram=#Z`pwd`/plan9.nvr" "canopenpath=`pwd`/plan9" -u bootes

When you see the vx32# prompt add a key so that you can cpu as glenda:

vx32# echo 'key proto=p9sk1 dom=9vx user=glenda !password=password' >/mnt/factotum/ctl

Now you can cpu to your new server. From another 9vx instance (forexample, booted from the iso):

% cpu -h 127.0.0.1

If it worked we are done.

Now you will probably want to adjust to your needs the 9vxc script tolaunch cpu servers (also, think about adding a /cfg/vx32/cpurc file).

You could be interested in the options localroot, canopenpath,cpulimit and memsize. Or maybe you want to setup a virtual ethernetdevice (have a look at the tap script and the 9vx man page).

Have fun! (and please, report bugs)

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- yiyus || JGL . 4l77.com