I’m a long time flow-tools user and am in the very early stages of migrating to
nfdump.
I'm attempting to execute nfcapd on a generic RHEL5 system and I'm getting a
stat() failed error telling me that my flow base dir is an invalid argument.
This feels like a really basic permissions problem, so I've checked the
permissions of my flow base dir, deleted it, recreated it, chmod'ed it, chown'd
it, etc., with no success. I also strace'd the execution of nfcapd looking for
more information about the call to stat() but that was not enlightening either.
As a last resort, I compiled a C stat() reference program and executed it
against my directory and that program completed successfully.
I dug through the nfdump mailing lists archives and I don't see anyone else
having this issue so I figured I'd post the problem here.
Here are the ugly details.
-bash-3.2$ whoami
mrtg <- I'm running as the user named "mrtg"
-bash-3.2$
-bash-3.2$ ./nfcapd -V
./nfcapd: Version: 1.6.10p1 $Date: 2013-08-06 10:31:45 +0200 (Tue, 06 Aug 2013)
$ <- my nfcpad version info
-bash-3.2$
-bash-3.2$ ./nfcapd -w -D -l /opt/netflow/v9flows -p 2099
stat() failed on /opt/netflow/v9flows: Invalid argument <- this is the error
message
-bash-3.2$
-bash-3.2$ ls -ald /opt/netflow/v*
drwxr-xr-x 2 mrtg isjnetpt 4096 Aug 29 12:38 /opt/netflow/v9flows <- this
is my nfcapd flow base dir, owned by userid=mrtg and with 755 perms
-bash-3.2$
This is the strace output when I launch nfcapd. Strangely enough, I see lots of
calls to stat(<some_other_file_or_dir>) but never a call to
stat(/opt/netflow/v9flows).
-bash-3.2$ strace ./nfcapd -w -D -l /opt/netflow/v9flows -p 2099
execve("./nfcapd", ["./nfcapd", "-w", "-D", "-l", "/opt/netflow/v9flows", "-p",
"2099"], [/* 29 vars */]) = 0
brk(0) = 0x15dd000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x2b38fd0f2000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x2b38fd0f3000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/opt/CA/SharedComponents/ETPKI/../lib/tls/x86_64/libresolv.so.2",
O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/ETPKI/../lib/tls/x86_64", 0x7ffff9553680) = -1
ENOENT (No such file or directory)
open("/opt/CA/SharedComponents/ETPKI/../lib/tls/libresolv.so.2", O_RDONLY) = -1
ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/ETPKI/../lib/tls", 0x7ffff9553680) = -1 ENOENT
(No such file or directory)
open("/opt/CA/SharedComponents/ETPKI/../lib/x86_64/libresolv.so.2", O_RDONLY) =
-1 ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/ETPKI/../lib/x86_64", 0x7ffff9553680) = -1
ENOENT (No such file or directory)
open("/opt/CA/SharedComponents/ETPKI/../lib/libresolv.so.2", O_RDONLY) = -1
ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/ETPKI/../lib", {st_mode=S_IFDIR|0755,
st_size=4096, ...}) = 0
open("/opt/CA/SharedComponents/lib/tls/x86_64/libresolv.so.2", O_RDONLY) = -1
ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/lib/tls/x86_64", 0x7ffff9553680) = -1 ENOENT (No
such file or directory)
open("/opt/CA/SharedComponents/lib/tls/libresolv.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat("/opt/CA/SharedComponents/lib/tls", 0x7ffff9553680) = -1 ENOENT (No such
file or directory)
open("/opt/CA/SharedComponents/lib/x86_64/libresolv.so.2", O_RDONLY) = -1
ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/lib/x86_64", 0x7ffff9553680) = -1 ENOENT (No
such file or directory)
open("/opt/CA/SharedComponents/lib/libresolv.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat("/opt/CA/SharedComponents/lib", {st_mode=S_IFDIR|0755, st_size=4096, ...})
= 0
open("/opt/CA/CAlib/tls/x86_64/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat("/opt/CA/CAlib/tls/x86_64", 0x7ffff9553680) = -1 ENOENT (No such file or
directory)
open("/opt/CA/CAlib/tls/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat("/opt/CA/CAlib/tls", 0x7ffff9553680) = -1 ENOENT (No such file or
directory)
open("/opt/CA/CAlib/x86_64/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat("/opt/CA/CAlib/x86_64", 0x7ffff9553680) = -1 ENOENT (No such file or
directory)
open("/opt/CA/CAlib/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat("/opt/CA/CAlib", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/lib/tls/x86_64/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat("/usr/lib/tls/x86_64", 0x7ffff9553680) = -1 ENOENT (No such file or
directory)
open("/usr/lib/tls/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat("/usr/lib/tls", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/lib/x86_64/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat("/usr/lib/x86_64", 0x7ffff9553680) = -1 ENOENT (No such file or directory)
open("/usr/lib/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat("/usr/lib", {st_mode=S_IFDIR|0755, st_size=32768, ...}) = 0
open("/opt/CA/SharedComponents/Csam/SockAdapter/lib/tls/x86_64/libresolv.so.2",
O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/Csam/SockAdapter/lib/tls/x86_64",
0x7ffff9553680) = -1 ENOENT (No such file or directory)
open("/opt/CA/SharedComponents/Csam/SockAdapter/lib/tls/libresolv.so.2",
O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/Csam/SockAdapter/lib/tls", 0x7ffff9553680) = -1
ENOENT (No such file or directory)
open("/opt/CA/SharedComponents/Csam/SockAdapter/lib/x86_64/libresolv.so.2",
O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/Csam/SockAdapter/lib/x86_64", 0x7ffff9553680) =
-1 ENOENT (No such file or directory)
open("/opt/CA/SharedComponents/Csam/SockAdapter/lib/libresolv.so.2", O_RDONLY)
= -1 ENOENT (No such file or directory)
stat("/opt/CA/SharedComponents/Csam/SockAdapter/lib", {st_mode=S_IFDIR|0755,
st_size=4096, ...}) = 0
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=59564, ...}) = 0
mmap(NULL, 59564, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2b38fd0f4000
close(3) = 0
open("/lib64/libresolv.so.2", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0203\200+;\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=92816, ...}) = 0
mmap(0x3b2b800000, 2181896, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x3b2b800000
mprotect(0x3b2b811000, 2097152, PROT_NONE) = 0
mmap(0x3b2ba11000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x3b2ba11000
mmap(0x3b2ba13000, 6920, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3b2ba13000
close(3) = 0
open("/opt/CA/SharedComponents/ETPKI/../lib/libc.so.6", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/opt/CA/SharedComponents/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such
file or directory)
open("/opt/CA/CAlib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or
directory)
open("/usr/lib/tls/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/opt/CA/SharedComponents/Csam/SockAdapter/lib/libc.so.6", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/lib64/libc.so.6", O_RDONLY) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\332\301';\0\0\0"..., 832) =
832
fstat(3, {st_mode=S_IFREG|0755, st_size=1718232, ...}) = 0
mmap(0x3b27c00000, 3498328, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x3b27c00000
mprotect(0x3b27d4d000, 2097152, PROT_NONE) = 0
mmap(0x3b27f4d000, 20480, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14d000) = 0x3b27f4d000
mmap(0x3b27f52000, 16728, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3b27f52000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x2b38fd103000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x2b38fd104000
arch_prctl(ARCH_SET_FS, 0x2b38fd103b80) = 0
mprotect(0x3b27f4d000, 16384, PROT_READ) = 0
mprotect(0x3b2ba11000, 4096, PROT_READ) = 0
mprotect(0x3b27a1c000, 4096, PROT_READ) = 0
munmap(0x2b38fd0f4000, 59564) = 0
write(2, "stat() failed on /opt/netflow/v9"..., 56stat() failed on
/opt/netflow/v9flows: Invalid argument
) = 56
exit_group(255) = ?
-bash-3.2$
I know stat() works because the output below is what is produced by the stat()
man page reference program at the bottom of http://linux.die.net/man/2/stat.
-bash-3.2$ ./stat-test /opt/netflow/v9flows/
File type: directory
I-node number: 2
Mode: 40755 (octal)
Link count: 1159
Ownership: UID=725 GID=0
Preferred I/O block size: 8 bytes
File size: 4096 bytes
Blocks allocated: 1378211639
Last status change: Wed Dec 31 18:00:00 1969
Last file access: Wed Dec 31 18:00:00 1969
Last file modification: Wed Dec 31 18:00:00 1969
-bash-3.2$
I feel like I’m missing something really basic here - am I'm using the -l flag
correctly? I've tried all kinds of iterations of the nfcapd command line opts
and I always get that stat error.
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