List Archive: gentoo-amd64
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On 4/3/06, Sami Samhuri <sami@...> wrote:
> Mark Knecht wrote:
> > Hello,
> > There have been no changes or updates of any kind to the remote
> > machine that has the NFS directory exported. Normal updates have been
> > occurring on my AMD64 machine so presumably the problem is on this
> > machine as none of the remote files are writable anymore. One thing I
> > notice is that on the remote machine there are some directories and
> > files which have user names and some which only have numbers like 501,
> > 502, etc.
> > Where would I start looking for what's changed?
> The file system stores a user id for the owner and group. ls looks up the user
> id in /etc/passwd and shows you the username instead. You can make ls show user
> id's instead of names with `ls -ln`.
OK, I basically knew this...
> When you see numbers such as 501 in the directory listing that means the user or
> group who had that user id is not found in /etc/passwd or /etc/group.
OK, that means it's using the passwd file local to that specific
machine then. Here's what I have:
NFS Server: Only one user account:
MythTV Backend Server: 3 user accounts:
AMD64 machine: 2 user accounts:
> The user id's on all the machines you use with NFS have to be the same. I found
> this in the HP-UX documentation via google:
> >>>> From: http://docs.hp.com/en/5991-1153/ch02s01.html#bghdjbfa
> To Set User IDs and Group IDs (if neither NIS nor NIS+ is used)
> * Create one /etc/passwd file and one /etc/group file that contain all the users
> and groups on the network, and then copy these files to all the machines on the
> * Edit the /etc/passwd and /etc/group files on each machine to ensure that the
> following conditions are true:
> o Each user has the same user ID on all machines where that user has an account.
> o No two users anywhere on the network have the same user ID.
> o Each group has the same group ID on all machines where that group exists.
> o No two groups on the network have the same group ID.
> When users request NFS access to remote files, their user IDs and group IDs are
> used to check file ownership and permissions, just as they are locally.
> If a user has one user ID on an NFS client and a different user ID on an NFS
> server, the server will not grant the user access to his or her files on the
> server, because it thinks the files belong to someone else.
> If a user on one machine has the same user ID as a user on another machine, one
> user may gain access to the other user's files.
> Perhaps your user ids don't match. I've been bitten by this before sharing
> between Mac OS X, Gentoo, and Ubuntu. Hope this helps.
OK, I think you've hit on a potential problem here. Problem is what is
the best way to address this on machines that have been running for a
long time? Can I safely edit /etc/passwd and /etc/group and then do
chown -R commands to change the ownership of files on the systems
after I make all the IDs and groups identical?
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