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Re: files in /etc/xinetd.d become 0 byte size
Simon Matter schrieb:
>
> Hi all,
>
> I'm setting up a new server, basically it's RedHat 7.2 XFS with all
> updates from RedHat applied. Kernel is 2.4.9-31SGI_XFS_1.0.2. I have two
> IDE disks with software RAID1 partitions for /, /boot, /home. Nothing
> special.
>
> The problem I have is that after some installation and configuration
> work, some xinetd config files in /etc/xinetd.d became 0 byte size. IIRC
> I saw the same thing some time ago with another machine but I really
> don't understand what's going on. BTW, I didn't have a crash or unclean
> shutdown.
>
> [root@gw-linux-dev xinetd.d]# ll /etc/xinetd.d
> total 44
> -rw-r--r-- 1 root root 295 Mar 18 15:53 chargen
> -rw-r--r-- 1 root root 315 Mar 18 15:53 chargen-udp
> -rw-r--r-- 1 root root 295 Mar 18 15:53 daytime
> -rw-r--r-- 1 root root 315 Mar 18 15:53 daytime-udp
> -rw-r--r-- 1 root root 287 Mar 18 15:53 echo
> -rw-r--r-- 1 root root 306 Mar 18 15:53 echo-udp
> -rw-r--r-- 1 root root 317 Mar 18 15:53 finger
> -rw-r--r-- 1 root root 491 Mar 18 15:53 jftpgw-inet
> -rw-r--r-- 1 root root 257 Mar 18 15:53 ntalk
> -rw-r--r-- 1 root root 0 Mar 18 15:53 rexec
> -rw-r--r-- 1 root root 0 Mar 18 15:53 rlogin
> -rw-r--r-- 1 root root 0 Mar 18 15:53 rsh
> -rw-r--r-- 1 root root 0 Mar 18 15:53 rsync
> -rw-r--r-- 1 root root 0 Mar 18 15:53 talk
> -rw-r--r-- 1 root root 0 Mar 18 15:53 telnet
> -rw-r--r-- 1 root root 0 Mar 18 15:53 time
> -rw-r--r-- 1 root root 0 Mar 18 15:53 time-udp
> -rw-r--r-- 1 root root 0 Mar 18 15:53 wu-ftpd
>
> I have then restored the empty files from another installation.
> Everything seemed okay. I have then rebooted and now it's getting more
> interesting.
>
> [root@gw-linux-dev xinetd.d]# ll
> total 36
> -rw-r--r-- 1 root root 295 Mar 18 15:59 chargen
> -rw-r--r-- 1 root root 315 Mar 18 15:59 chargen-udp
> -rw-r--r-- 1 root root 295 Mar 18 15:59 daytime
> -rw-r--r-- 1 root root 315 Mar 18 15:59 daytime-udp
> -rw-r--r-- 1 root root 287 Mar 18 15:59 echo
> -rw-r--r-- 1 root root 306 Mar 18 15:59 echo-udp
> -rw-r--r-- 1 root root 317 Mar 18 15:59 finger
> -rw-r--r-- 1 root root 491 Mar 18 15:59 jftpgw-inet
> -rw-r--r-- 1 root root 257 Mar 18 15:59 ntalk
> -rw-r--r-- 1 root root 359 Mar 18 15:59 rexec
> -rw-r--r-- 1 root root 376 Mar 18 15:59 rlogin
> -rw-r--r-- 1 root root 428 Mar 18 15:59 rsh
> -rw-r--r-- 1 root root 317 Mar 18 15:59 rsync
> -rw-r--r-- 1 root root 245 Mar 18 15:59 talk
> -rw-r--r-- 1 root root 303 Mar 18 15:59 telnet
> -rw-r--r-- 1 root root 319 Mar 18 15:59 time
> -rw-r--r-- 1 root root 315 Mar 18 15:59 time-udp
> -rw-r--r-- 1 root root 361 Mar 18 15:59 wu-ftpd
>
> It looks okay, but then I tried this:
> [root@gw-linux-dev xinetd.d]# cat rsh
> [root@gw-linux-dev xinetd.d]#
>
> Further investigation shows that the same files that were missing before
> are now filled with zero. After restarting xinetd, I guess they will be
> 0 bytes in size.
>
> I have searched RedHat bugzilla but didn't find anything useful.
> What comes to mind is the problem with zero filled bytes after a crash
> but I didnt' have any crash or unclean shutdowns. It seems to be
> something similar anyway.
>
> Is it possible that xinetd performs an operation on the files which
> leaves them not cleanly flushed to disk when shutting down?
>
> Thanks for any help!
>
> -Simon
I reproduced it now:
Using ntsysv to manage services -> reboot: Files in /etc/xinetd.d have
normal size but filled with zero. Using ntsysv again truncates them to
zero size. Maybe write cache on the disks is enabled for some reason.
That could explain why changes are not commited to disk. I don't
understand it anyway because on reboot, the cache should be flushed to
disk, doesn't it? The hole thing lets me feel quite bad because I'm
wondering what else has been lost.
Can anybody confirm similar problems?
-Simon