Greetings!
I've been running Apache web sites for years, but until now had never needed
to reference environment variables inside the configuration files. I'm trying
to set up a load balancing configuration using mod_proxy_balancer under Apache
2.2.3 (stock install under Debian Etch).
My enabled modules are:
core_module (static)
log_config_module (static)
logio_module (static)
mpm_prefork_module (static)
http_module (static)
so_module (static)
alias_module (shared)
auth_basic_module (shared)
authn_file_module (shared)
authz_default_module (shared)
authz_groupfile_module (shared)
authz_host_module (shared)
authz_user_module (shared)
autoindex_module (shared)
cgi_module (shared)
dir_module (shared)
env_module (shared)
headers_module (shared)
mime_module (shared)
negotiation_module (shared)
php4_module (shared)
proxy_module (shared)
proxy_balancer_module (shared)
proxy_connect_module (shared)
proxy_http_module (shared)
setenvif_module (shared)
status_module (shared)
userdir_module (shared)
Here is the failing part of the config file:
<VirtualHost *:8080>
# Proxy configuration for testing load balancer.
# S. Courtney, Sine Nomine Associates, 2007-09-24
# For documentation see http://httpd.apache.org/docs/2.2/mod/mod_proxy.html
# and http://issues.apache.org/bugzilla/show_bug.cgi?id=43433
ServerName myapp.sinenomine.net
ProxyRequests off
LogLevel debug
ErrorLog /var/log/apache2/debug.log
<Proxy balancer://etr_cluster>
# This sets a cookie telling which server should have affinity for this client.
# Requires mod_headers to be loaded.
# Header always add Set-Cookie "MYAPP=MYAPP.%{BALANCER_WORKER_ROUTE}e; path=/;" env=BALANCER_ROUTE_CHANGED
Header always add Set-Cookie "MYAPP=MYAPP.%{BALANCER_WORKER_ROUTE}e; path=/;"
Header always add X-Myapp-Balancer "%{BALANCER_WORKER_NAME}e;"
Header always add X-Server-Addr "%{SERVER_ADDR}e"
BalancerMember http://192.168.201.121:28080 smax=5 max=20 loadfactor=10 route=etr01
BalancerMember http://192.168.201.121:38080 smax=5 max=20 loadfactor=10 route=etr02
Order deny,allow
Deny from all
Allow from all
</Proxy>
# Uncomment the following line to enable session affinity, required for reports to work
# Note that we _do_ allow failover, realizing that it will not work for report downloads
# in progress. We accept a small limitation for a large gain in functionality.
# The stickysession parameter relies on the cookie set in the balancer declaration above.
ProxyPass / balancer://etr_cluster/ nofailover=On stickysession=myapp
# Uncomment the following line to disable session affinity
# ProxyPass / balancer://etr_cluster/ nofailover=off
# These lines prevent the users from seeing the canonical host in redirections.
# CAUTION: The trailing slash is significant!
ProxyPassReverse / balancer://etr_cluster/
ProxyPassReverse / http://192.168.201.121:28080/
ProxyPassReverse / http://192.168.201.121:38080/
ProxyPassReverseCookieDomain 192.168.201.121 myapp.sinenomine.net
</VirtualHost>
The line "Header always add X-Server-Addr "%{SERVER_ADDR}e"" is just for testing.
The basis for this configuration is from
http://issues.apache.org/bugzilla/show_bug.cgi?id=43433
When I run this, everything works fine with no errors in the log, except that
all the environment variables are replaced with "(null)" in the I/O to the
browser.
I feel I must be overlooking something obvious...anyone see what I'm doing
wrong?
Kind regards, and thanks,
Scott
--
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Scott D. COURTNEY, Principal Engineer Sine Nomine Associates
scourtney@xxxxxxxxxxxxxx http://www.sinenomine.net/
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