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mod_backhand unresponsive, then failure to requests
 

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lister at primetime

Feb 20, 2005, 4:20 PM


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mod_backhand unresponsive, then failure to requests

Configuration :
10.200.1.111 and 10.200.1.112
OS : 4.11-STABLE FreeBSD
packages (all source compiled from ports) :
apache+mod_ssl-1.3.33+2.8.22
mod_backhand-1.2.2 mod_bandwidth-2.0.5
mod_dav-1.0.3_2 mod_php4-4.3.10_2,1

Node 1 httpd.conf :
<IfModule mod_backhand.c>
UnixSocketDir /var/backhand/backhand
MulticastStats 10.200.1.111 10.200.1.255:4445,1
AcceptStats 10.200.1.0/24
</IfModule>

<Location "/backhand/">
SetHandler backhand-handler
</Location>

<Directory /usr/local/www/data/www.lauraandamber.com>
Backhand removeSelf
Backhand byBusyChildren
</Directory>

Node 2 httpd/conf :
<IfModule mod_backhand.c>
UnixSocketDir /var/backhand/backhand
MulticastStats 10.200.1.112 10.200.1.255:4445,1
AcceptStats 10.200.1.0/24
</IfModule>

<Location "/backhand/">
SetHandler backhand-handler
</Location>
Both with and with out this :
<Directory /usr/local/www/data/www.lauraandamber.com>
Backhand addSelf
</Directory>

I (re)start apache and see
[Sun Feb 20 17:10:17 2005] [notice] SIGUSR1 received. Doing graceful
restart
[Sun Feb 20 17:10:17 2005] [notice] mod_backhand -- UnixSocketDir set to
/var/backhand/backhand
[Sun Feb 20 17:10:17 2005] [notice] mod_backhand -- Broadcast
10.200.1.255:4445 added
[Sun Feb 20 17:10:17 2005] [notice] mod_backhand -- Multicast accept
10.200.1.0/24
[Sun Feb 20 17:10:17 2005] [notice] backhand_init(4859) spawning
moderator (PID 4910)
[Sun Feb 20 17:10:17 2005] [notice] mod_backhand moderator ready to go
[Sun Feb 20 17:10:18 2005] [notice] Apache/1.3.33 (Unix) PHP/4.3.10
mod_backhand/1.2.2 DAV/1.0.3 configured -- resuming normal operations
[Sun Feb 20 17:10:18 2005] [notice] Accept mutex: flock (Default: flock)

After a bunch of refreshes normal (I see the pages in each system's
access log) to the page :
http://bookpc1/www.lauraandamber.com/
It stops responding, and I see (something like) this :

> netstat
tcp4 0 0 10.200.1.111.4179 10.200.1.112.http SYN_SENT
tcp4 0 0 10.200.1.111.3412 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.1875 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4199 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.2039 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3527 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4922 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4064 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3785 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4986 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3011 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.1702 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.2660 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3068 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4948 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.2797 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3074 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4851 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4449 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3046 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4777 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.http 10.200.1.90.4496
TIME_WAIT
tcp4 0 0 10.200.1.111.4098 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3982 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.1582 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.1488 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.1329 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.http 10.200.1.90.1974
TIME_WAIT
tcp4 0 0 10.200.1.111.4357 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.2882 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.2489 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3332 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.4193 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3413 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3676 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.http 10.200.1.90.1715
TIME_WAIT
tcp4 0 0 10.200.1.111.http 10.200.1.90.1416
TIME_WAIT
tcp4 0 0 10.200.1.111.4907 10.200.1.112.http
TIME_WAIT
tcp4 0 0 10.200.1.111.3817 10.200.1.112.http
TIME_WAIT

I see nothing in the back end's (bookpc2, .112) logs, but in the front
end's logs 9bookpc1, .111) I start to (slowly) see these :
[Sun Feb 20 16:29:55 2005] [warn] (4)Interrupted system call: connect()
timed out

Eventually, I see this :
[Sun Feb 20 14:18:09 2005] [error] [client 10.200.1.90] Request exceeded
the limit of 20 internal redirects due to probable configuration error.
Use 'LimitInternalRecursion' to increase the limit if necessary. Use
'LogLevel debug' to get a backtrace.

And / or this :
[Sun Feb 20 16:53:12 2005] [error] mod_backhand: child 4734 hung talking
to moderator. Die!
And
[Sun Feb 20 17:06:41 2005] [error] (61)Connection refused: Child 4874
failed to establish umbilical to moderator!
And
[Sun Feb 20 17:08:09 2005] [notice] child pid 4860 exit signal Broken
pipe (13)
And
message format error

This list / package appears to be have relatively low volume of
chatter. This could either mean 'really stable' or 'dead project'.
I asked on #apache, and people said it was 'in use, but not being
developed (for)'.
I would love to use this to load balance for some XML-RPC scripts
I am developing, but it has to berock solid for this. If this is not the
tool, is there something that people are using now?

TIA


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Subject User Time
mod_backhand unresponsive, then failure to requests lister at primetime Feb 20, 2005, 4:20 PM

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