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Re: 3 SysAdmin questions
On Thu, 1 May 1997, Tuvik Beker wrote:
> 1. I have the following problem: I want to share home directories in a
> network with hosts of different architectures, that were recently put
> together. Currently we have SGI and Linux, others may be added. The
> problem is to map the UID/GID spaces correctly. On a pure linux net,
why not NIS+? if you have about 20 users, or even 60, it's easy to synch
GIDs and UIDs again.
> The problem (apart from how to do it properly...) is the silly group
> convention used by RedHat, which is unlike anything standard, POSIX or
> other. Do you think it would matter much if I abandon it and adopt a
read about it a little in the RedHat FAQ, it isn't silly at all, it is
actually VERY helpful. thing is that it can be nicely mixed with other
schemes if you need...
> more conventional GID allocation? Does anyone have better ideas of how
> to accomplish the task? Bare in mind that each host already has its set
> of users, and some users have separate accounts on different hosts. The
> aim is to cause minimal disturbance while doing the merge.
convert a few people's UIDs each day, or automate it and do the whole
server one night in one blow so the UIDs are synched and use NIS+, or
start playing around with Radius...
> 2. Any recommecdations as to agood backup tool for linux? Of course,
> one can simply write backup scripts to be run with cron, but I guess
> there should exist smarter applications, giving easy controll over
> multiple backups to tapes and disks etc.
try AMANDA at http://www.cs.umd.edu/projects/amanda/index.html
BRU is commercial http://www.estinc.com/features.html
PerfactBACKUP+ at http://home.XL.CA/perfectBackup/
> 3. There were threads in the past dealing with HD->HD duplication in the
> case of identical disks, and several solutions were suggested. What
> about moving an entire system to a larger disk? What is least likely to
> cause problems - tar|tar or dd (or cp -... ).
afaik tar|tar should have the same resaults as cp -a, if used with the
right commandline switches. I once jammed an entire computer because I
untared the file system before I had /etc/passwd restored, and many files
were not created with the right persmissions or ownerships, when that
happens in /dev you may never get out of it, that's why I believe cp -a is
better, though I can't tell you if faster.
-------------------------------------------------------------
Ira Abramov <ira@scso.com> Scalable Solutions
POBox 3600, Jerusalem 91035, Israel Tel (972)2-642-6822
http://www.scso.com/~ira Check out: http://www.linux.org.il
References: