Are you running out of file descriptors with your Apache Process ? [ulimit -a]
Greetings
Oliver
-----Ursprüngliche Nachricht-----
Von: Neil A. Hillard [mailto:hillardn@xxxxxxxxx]
Gesendet: Mi 25.01.2006 10:53
An: users@xxxxxxxxxxxxxxxx
Betreff: [users@httpd] Apache drops connection but ifdown/up resolves the issue!
Hi,
I've got Apache 2.0.55 built from source and am seeing an odd problem
related to multiple IP addresses on VLANs.
The server has a trunked connection back to our switch and has the IP
addresses 172.24.12.9, 172.24.11.3 and 172.16.14.104. These are
configured as bond0, bond0:2 and bond0.2 respectively. There are other
aliases IP addresses on bond0 but they're probably irrelevant for this
problem.
Apache is listening on all interfaces, port 80 and 443.
I have a client at 172.16.40.32 attempting to connect to port 80 on
172.24.11.3. The following occurs:
# telnet 172.24.11.3 80
Trying 172.24.11.3...
Connected to 172.24.11.3 (172.24.11.3).
Escape character is '^]'.
Connection closed by foreign host.
An strace against httpd shows:
[pid 31138] accept(3, {sa_family=AF_INET, sin_port=htons(44894),
sin_addr=inet_addr("172.16.40.32")}, [16]) = 16
[pid 31138] semop(6914069, 0xb79f0c, 1) = 0
[pid 31138] futex(0x837c474, FUTEX_WAKE, 1 <unfinished ...>
[pid 31130] <... futex resumed> ) = 0
[pid 31138] <... futex resumed> ) = 1
[pid 31138] semop(6914069, 0xb79f12, 1) = 0
[pid 31138] poll( <unfinished ...>
[pid 31130] futex(0x837c43c, FUTEX_WAKE, 1) = 0
[pid 31130] getsockname(16, {sa_family=AF_INET, sin_port=htons(80),
sin_addr=inet_addr("172.24.11.3")}, [16]) = 0
[pid 31130] fcntl64(16, F_GETFL) = 0x2 (flags O_RDWR)
[pid 31130] fcntl64(16, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 31130] read(16, 0x83eccf8, 8000) = -1 EAGAIN (Resource
temporarily unavailable)
[pid 31130] poll([{fd=16, events=POLLIN,
revents=POLLIN|POLLERR|POLLHUP}], 1, 300000) = 1
[pid 31130] read(16, 0x83eccf8, 8000) = -1 ECONNRESET (Connection
reset by peer)
[pid 31130] gettimeofday({1138182161, 971221}, NULL) = 0
[pid 31130] shutdown(16, 1 /* send */) = -1 ENOTCONN (Transport
endpoint is not connected)
[pid 31130] close(16) = 0
If I then perform 'ifconfig bond0.2 down', 'ifconfig bond0.2 up' and
repeat the test everything works as expected! It carries on working for
a while and then gives up the ghost again!
Apache is receiving the connection and I can see from a packet capture
that the three-way handshake is completing but for some reason it's
dropping the connection - almost like tcpwrappers does!
Whilst Apache is refusing the connections, I can still ssh to the same
IP address.
This one has me puzzled - if anyone can shed some light on it, it would
be much appreciated!
Many thanks in advance,
Neil.
--
Neil Hillard hillardn@xxxxxxxxx
Westland Helicopters Ltd. http://www.whl.co.uk/
Disclaimer: This message does not necessarily reflect the
views of Westland Helicopters Ltd.
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