We recently moved to a load balanced environment for a large mod_perl,
mason based application using mod_backhand from a 1 server environment,
to a 3 server environment.
We are using Apache 1.3.33, mod_backhand 1.2.2 and mod_perl 1.29 on Suse
Linux 9.1. We have an unusual configuration in that we are running on
port 81. We have a front-end apache that runs mod_ssl and mod_rewrite
and handles all the SSL so the back-end servers don't have the overhead
of dealing with ssl. The front-end servers are utilizing mod_rewrite
with proxy to send request to the back-end server, that is running the
application.
We have had quite a few problems since doing this that seem to be
directly related to mod_backhand. It intermittently responds from Get
requests, by dropping the parameters and going to the default screen(s).
For instance, when listing a client screen that shows an alphabetical
list of all clients that begin with S, we have the parameters that look
like ?start=s&all=1 after the URL to our mason component. Occasionally,
the URL shows the parameter list correctly, but lists the A list, which
is the default if not start parameter is listed. This is just one
example. Out of the hundreds of screens in the app, many are losing
parameters, causing the user to have to reload to resolve the issue.
Our initial configuration on all three boxes was exactly the same as
from the examples of the Configuration Help screen -
http://www.backhand.org/mod_backhand/configuring.shtml.
<IfModule mod_backhand.c>
# This directorty must be readable and writable by euid of apache
(nobody)
# The mod_backhand-Arriba and the AF_UNIX domain files are stored in
here.
UnixSocketDir /var/backhand/backhand
# This would be the way to do ethernet broadcast
# MulticastStats 128.220.221.255:4445
# but we choose to use the following IP multicast address with a TTL
of 1
MulticastStats 239.255.221.20:4445,1
# We want to accept resource information originating from any IP on
our
# network.
AcceptStats 128.220.221.0/24
</IfModule>
<Directory "/var/backhand/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
Backhand byAge
Backhand byRandom
Backhand byLogWindow
Backhand byLoad
</Directory>
We have experimented with many options including having the primary
server remove itself from the cluster, and have the secondary servers
with no backhand directory options(all retain their IfModule sections):
The primary server:
<Directory "/var/backhand/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
Backhand byAge
Backhand removeSelf
Backhand byRandom
Backhand byLoad
</Directory>
The secondary servers:
<Directory "/var/backhand/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
</Directory>
Has anyone else found issues with parameters being lost?
Also, the issue with incorrect memory being displayed as
4294967295 MB
4294967295 MB
For Total Mem and Available Mem.
Paul Millard
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mason based application using mod_backhand from a 1 server environment,
to a 3 server environment.
We are using Apache 1.3.33, mod_backhand 1.2.2 and mod_perl 1.29 on Suse
Linux 9.1. We have an unusual configuration in that we are running on
port 81. We have a front-end apache that runs mod_ssl and mod_rewrite
and handles all the SSL so the back-end servers don't have the overhead
of dealing with ssl. The front-end servers are utilizing mod_rewrite
with proxy to send request to the back-end server, that is running the
application.
We have had quite a few problems since doing this that seem to be
directly related to mod_backhand. It intermittently responds from Get
requests, by dropping the parameters and going to the default screen(s).
For instance, when listing a client screen that shows an alphabetical
list of all clients that begin with S, we have the parameters that look
like ?start=s&all=1 after the URL to our mason component. Occasionally,
the URL shows the parameter list correctly, but lists the A list, which
is the default if not start parameter is listed. This is just one
example. Out of the hundreds of screens in the app, many are losing
parameters, causing the user to have to reload to resolve the issue.
Our initial configuration on all three boxes was exactly the same as
from the examples of the Configuration Help screen -
http://www.backhand.org/mod_backhand/configuring.shtml.
<IfModule mod_backhand.c>
# This directorty must be readable and writable by euid of apache
(nobody)
# The mod_backhand-Arriba and the AF_UNIX domain files are stored in
here.
UnixSocketDir /var/backhand/backhand
# This would be the way to do ethernet broadcast
# MulticastStats 128.220.221.255:4445
# but we choose to use the following IP multicast address with a TTL
of 1
MulticastStats 239.255.221.20:4445,1
# We want to accept resource information originating from any IP on
our
# network.
AcceptStats 128.220.221.0/24
</IfModule>
<Directory "/var/backhand/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
Backhand byAge
Backhand byRandom
Backhand byLogWindow
Backhand byLoad
</Directory>
We have experimented with many options including having the primary
server remove itself from the cluster, and have the secondary servers
with no backhand directory options(all retain their IfModule sections):
The primary server:
<Directory "/var/backhand/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
Backhand byAge
Backhand removeSelf
Backhand byRandom
Backhand byLoad
</Directory>
The secondary servers:
<Directory "/var/backhand/cgi-bin">
AllowOverride None
Options None
Order allow,deny
Allow from all
</Directory>
Has anyone else found issues with parameters being lost?
Also, the issue with incorrect memory being displayed as
4294967295 MB
4294967295 MB
For Total Mem and Available Mem.
Paul Millard
This email and any files transmitted with it may contain legally privileged and/or confidential information intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error, please let us know by replying to the sender, and immediately delete this email from your system. Please note that in these circumstances, the use, disclosure, distribution or copying of this information is strictly prohibited. We apologize for any inconvenience that may have been caused to you.
Examinetics, Inc. does not accept any responsibility for the accuracy or completeness of this message as it has been transmitted over a public network.