From: Herbert Poetzl (herbert_at_13thfloor.at)
Date: Sat 27 Mar 2004 - 20:30:32 GMT
On Sat, Mar 27, 2004 at 08:11:53PM +0100, Lars Braeuer wrote:
> I've had a problem when updating from 2.4.20ctx-17_quota to 2.4.24/vserver
> 1.26 (+quota) two weeks ago.
>
> The system hasn't been able to map the long unique uid's to usernames
> anymore after booting the new kernel. For now we are using the old kernel
> again and I'm kind of stuck in solving this problem.
>
> The first thing that seemed weird to me, is that when listing the files
> from outside the vserver, some files have a uid of 0 (root) and others have
> a long uid (i.e. 458752) which also seems to map to root (inside the
> vserver). Here's an example (listing via "ls -lagn /vserver/<name>"):
>
> ...
> drwxr-x--- 2 458752 458752 4096 Nov 19 02:08 service/
> drwxrwxrwt 3 0 0 8192 Mar 27 19:45 tmp/
> drwxr-xr-x 14 0 0 4096 Oct 16 11:36 usr/
> drwxr-xr-x 20 0 0 4096 Oct 15 01:38 var/
458752 = 7*65536 .. which suggests that you are using
a special context tagging mode, which isn't supported
anymore (uid16/gid16 mode)
> The same listing from inside the vserver ("vserver <name> exec ls -lagn /"):
>
> ...
> drwxr-x--- 2 0 0 4096 Nov 19 02:08 service
> drwxrwxrwt 3 0 0 8192 Mar 27 19:45 tmp
> drwxr-xr-x 14 0 0 4096 Oct 16 11:36 usr
> drwxr-xr-x 20 0 0 4096 Oct 15 01:38 var
>
> When updating to the new kernel the files with the long uid's are not
> properly mapped anymore. We noticed this because mysql wouldn't start in
> any of the 10 vservers on this system. After chown'ing the related
> mysql.pid files and directories the mysql server started. But there are
> tons of files with wrong uid's left, so this wouldn't be a solution, just a
> temporary patch.
as I see it, you have two options to migrate to 2.4.25/vs1.27
a) change the context tagging of all files to xid=0
- this can be done on the 'old' setup by using the
old chctx tool, or by touching each file from the
host context (xid = 0)
- or with tagxid disabled, using a small script,
reading the uid/gid, cropping them to 16 bits
- or by doing an xid agnostic backup (tar, dump)
b) converting the partition to the new context tagging
- again a small script, reading the uid/gid, splitting
it into xid/uid/gid and reassembling them to one of
the newer formats ...
> I wasn't able to test this issue anymore, because it's on a production
> system. I'll be starting another try next week, so if there are any other
> things I could check, please tell me.
> Thanks in advance for your help.
> Regards,
>
> Lars
HTH,
Herbert
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