Andrew wrote:
Hello everyone,
I have a ldap server running on another distro and I use it for a lot of
different things (such as users, passwords, and hosts) and it all works
fine on that distro. I'm also trying to get all of this to work in FC5
and so far I have gotten users and passwords to work but the hosts is
giving me problems. If I type getent hosts I see the complete list of
hosts as it should be but if I try to ping one of the hosts it just
hangs. If I try to ping the ip address everything works fine. I should
also note that I can't ping domain's either (such as yahoo.com) again it
just hangs but if I use a browser I can browse to them. On another
note, when I type getent hosts in the ldap console i can see the query
but when I try to ping a single domain I see nothing in the ldap
console, not even an attempt.
Thanks for your time
-Andrew
It appears that there is something strange going on internally in ping.
I see exactly the same problem, ping hangs. I've done some additional
tests. Namely, ssh, telnet and other commands resolve a hostname
perfectly, but ping is hanging on a futex. This is from strace:
munmap(0x2a9556c000, 4096) = 0
uname({sys="Linux", node="ion2.ion.le.ac.uk", ...}) = 0
futex(0x2a959b3da0, FUTEX_WAIT, 2, NULLopen("/etc/ldap.conf", O_RDONLY)
= 4
fstat(4, {st_mode=S_IFREG|0644, st_size=6231, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x2a9556c000
read(4, "# @(#)$Id: ldap.conf,v 1.24 2001"..., 4096) = 4096
read(4, "one\nnss_base_aliases\tou=Aliases,"..., 4096) = 2135
read(4, "", 4096) = 0
close(4) = 0
munmap(0x2a9556c000, 4096) = 0
open("/etc/ldap.secret", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=11, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
= 0x2a9556c000
read(4, "bindpassword\n\n", 4096) = 11
close(4) = 0
munmap(0x2a9556c000, 4096) = 0
uname({sys="Linux", node="ion2.ion.le.ac.uk", ...}) = 0
futex(0x2a959b3da0, FUTEX_WAIT, 2, NULL
and that's as far as it gets.
This affects both RHEL AS4 and WS4.
I first encountered this problem in the FC1 SMP kernel. At that time I
disabled ldap lookup of hosts. IIRC this was solved by removing the low
latency patch in the SMP kernel, but I never properly verified that. On
the FC1 server where I removed that patch ping works, but on the RHEL
AS/WS4 systems I have it does not.
I will try to do some more digging around next week.
--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@xxxxxxxxxxxx
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555
