From: smagnuson_at_forzani.com
Date: Wed 06 Apr 2005 - 22:10:00 BST
Herbert,
I'm sorry, perhaps I've gotten off track. This goes back to the df command not working in the vserver.
:df
df: cannot read table of mounted filesystems
you mentioned the following to me and I started chasing that rabbit.
> > no, that's not normal, but I suspect you are missing some
> > file (maybe /etc/mtab or so) which is used by the df
> > tool (using strace -fF on the df might shed some light
> > on that)
I was thinking that I needed an entry in /etc/fstab on the vserver to get df to work.
My strace is in a previous posting.
thanks
sig
-----Original Message-----
From: Herbert Poetzl [mailto:herbert_at_13thfloor.at]
Sent: Wednesday, April 06, 2005 2:51 PM
To: Magnuson, Sig
Cc: vserver_at_list.linux-vserver.org
Subject: Re: [Vserver] a couple of beginner questions
On Wed, Apr 06, 2005 at 12:58:09PM -0600, smagnuson_at_forzani.com wrote:
> If I add the following to the vserver fstab file and restart vserver.
> cat /etc/fstab
> /dev/root / ext3 rw 0 0
>
> Then df command works for the vserver partition
> df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/root 22G 2.5G 18G 13% /
>
> I have not gotten any other entries to work
well, what _would_ you like to add there?
I'm still not able to see what you try to accomplish ...
please either try to provide some more details, or
pay a visit at the irc channel #vserver @ irc.oftc.net
TIA,
Herbert
> But doing the above breaks the df command on the host server.
> df -h
> Filesystem Size Used Avail Use% Mounted on
> /dev/hdv1 198M 23M 166M 12% /
> none 2.0G 33M 1.9G 2% /tmp
>
> any suggestions on how this should be done?
> thanks
> sig
>
> -----Original Message-----
> From: vserver-bounces_at_list.linux-vserver.org
> [mailto:vserver-bounces_at_list.linux-vserver.org]On Behalf Of Magnuson,
> Sig
> Sent: Wednesday, April 06, 2005 8:31 AM
> To: vserver_at_list.linux-vserver.org
> Subject: RE: [Vserver] a couple of beginner questions
>
>
> Sorry, looking at my previous post I realized many may not look further down. Please scroll down.
>
>
> >> 1) When inside a guest OS the "df" command does not work.
> >> Is this normal? Here is my output:
> >> root_at_vcrux03 /
> >> :df
> >> df: cannot read table of mounted filesystems
> >> root_at_vcrux03 /
> >> :df -k
> >> df: cannot read table of mounted filesystems
>
> > no, that's not normal, but I suspect you are missing some
> > file (maybe /etc/mtab or so) which is used by the df
> > tool (using strace -fF on the df might shed some light
> > on that)
>
> >> Other commands like top, ps, du all work fine.
>
>
> When on the host server
> cat /usr/local/etc/vservers/crux03/fstab
> none /proc proc defaults 0 0
> none /tmp tmpfs size=16m,mode=1777 0 0
> none /dev/pts devpts gid=5,mode=620 0 0
>
>
> When on the vserver
> ls -la /etc/mtab
> -rw-r--r-- 1 root root 0 Apr 6 08:13 /etc/mtab
>
> ls -la /etc/fstab
> -rw-r--r-- 1 root root 0 Apr 6 08:12 /etc/fstab
>
> should I be populating my fstab with something? Everytime I put something in it the versver won't start. Anyone have a example to share?
>
> :strace -fF df
> execve("/bin/df", ["df"], [/* 25 vars */]) = 0
> uname({sys="Linux", node="vcrux03", ...}) = 0
> brk(0) = 0x8051000
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fea000
> open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("tls/i686/sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("tls/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("tls/sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("tls/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("i686/sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> ...
> ...
> open("/usr/lib/i686/sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> stat64("/usr/lib/i686/sse2", 0xbffff348) = -1 ENOENT (No such file or directory)
> open("/usr/lib/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> stat64("/usr/lib/i686", 0xbffff348) = -1 ENOENT (No such file or directory)
> open("/usr/lib/sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> stat64("/usr/lib/sse2", 0xbffff348) = -1 ENOENT (No such file or directory)
> open("/usr/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> stat64("/usr/lib", {st_mode=S_IFDIR|0755, st_size=8192, ...}) = 0
> open("/lib/i686/sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> stat64("/lib/i686/sse2", 0xbffff348) = -1 ENOENT (No such file or directory)
> open("/lib/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> stat64("/lib/i686", 0xbffff348) = -1 ENOENT (No such file or directory)
> open("/lib/sse2/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
> stat64("/lib/sse2", 0xbffff348) = -1 ENOENT (No such file or directory)
> open("/lib/libc.so.6", O_RDONLY) = 3
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340T\1"..., 512) = 512
> fstat64(3, {st_mode=S_IFREG|0755, st_size=1150376, ...}) = 0
> mmap2(NULL, 1129964, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0xb7ed6000
> mmap2(0xb7fdf000, 36864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x109) = 0xb7fdf000
> mmap2(0xb7fe8000, 7660, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7fe8000
> close(3) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7ed5000
> set_thread_area({entry_number:-1 -> 6, base_addr:0xb7ed5280, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
> brk(0) = 0x8051000
> brk(0x8072000) = 0x8072000
> brk(0) = 0x8072000
> open("/etc/mtab", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7ed4000
> read(3, "", 4096) = 0
> close(3) = 0
> munmap(0xb7ed4000, 4096) = 0
> write(2, "df: ", 4df: ) = 4
> write(2, "cannot read table of mounted fil"..., 40cannot read table of mounted filesystems) = 40
> write(2, "\n", 1
> ) = 1
> exit_group(1) = ?
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