configuring multiple domains using virtual host with mod proxy in a single httpd instance

Question

I have an apache instance running three domains using name based virtual hosting and every domain has resources to reverse proxy them down to an application server. Application

Answer 1

Create Three different Name-based VirtualHost and disable context(alpha and beta) in www.ghi.com.

<VirtualHost www.abc.com>
ServerName abc.com
Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/alpha" env=BALANCER_ROUTE_CHANGED
<Proxy balancer://mycluster1>
<LimitExcept POST GET>
order Allow,Deny
Deny from all
</LimitExcept>
BalancerMember http://x.x.x.x:8080 route=1 retry=0
BalancerMember http://x.x.x.x:8081 route=2 retry=0
ProxySet stickysession=ROUTEID
</Proxy>
ProxyPass /alpha balancer://mycluster4/alpha
ProxyPassReverse /alpha balancer://mycluster4/alpha
</VirtualHost>

<VirtualHost www.def.com>
ServerName def.com
Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/beta" env=BALANCER_ROUTE_CHANGED
<Proxy balancer://mycluster1>
<LimitExcept POST GET>
order Allow,Deny
Deny from all
</LimitExcept>
BalancerMember http://x.x.x.x:8080 route=1 retry=0
BalancerMember http://x.x.x.x:8081 route=2 retry=0
ProxySet stickysession=ROUTEID
</Proxy>
ProxyPass /beta balancer://mycluster4/beta
ProxyPassReverse /beta balancer://mycluster4/beta
</VirtualHost>

<VirtualHost www.ghi.com>
ServerName ghi.com
Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED
<Proxy balancer://mycluster1>
<LimitExcept POST GET>
order Allow,Deny
Deny from all
</LimitExcept>
BalancerMember http://x.x.x.x:8080 route=1 retry=0
BalancerMember http://x.x.x.x:8081 route=2 retry=0
ProxySet stickysession=ROUTEID
</Proxy>
ProxyPass /alpha !
ProxyPass /beta !
ProxyPass / balancer://mycluster4/
ProxyPassReverse / balancer://mycluster4/
</VirtualHost>

Answer 2

Use the below sequence and test.

ProxyPass /alpha !
ProxyPass /gamma balancer://mycluster4/gamma
ProxyPassReverse /gamma balancer://mycluster4/gamma
ProxyPass / balancer://mycluster4/
ProxyPassReverse / balancer://mycluster4/