How to run LiveView behind an Apache Load Balancer

How to run LiveView behind an Apache Load Balancer

What are the proxy and load-balancer configurations for connecting to LiveView tables through an Apache httpd server? Only Apache httpd.conf needs to be modified to permit proxying and load-balancing of LiveView Tables to external clients.

This example has been tested using product versions:

• Apache 2.4
• TIBCO Spotfire 10.8 (for re-connect capability)
• TIBCO Spotfire Data Streams (TIBCO Streaming) 10.5.0

and works for clients:

• command-line: lv-client -u lv://localhost:80 "select * from ItemsInventory"
• web browser (lvweb and other application end-points): http://localhost:80/simple
• Spotfire Analyst: localhost:80

This example redirects from the normal HTTP port 80 to back-end servers running on port 10080 at IP's 127.0.0.1 and 192.168.1.7. The LiveView application which provides the "/simple" end-point is sample "sample_lv_sample_javascript" available within StreamBase Studio. 

Make the following additions to the default Apache httpd.conf:

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_wstunnel_module modules/mod_proxy_wstunnel.so
LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
LoadModule xml2enc_module modules/mod_xml2enc.so
LoadModule headers_module modules/mod_headers.so

ProxyRequests Off
ProxyPreserveHost On

Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED

<Proxy "balancer://simple">
    BalancerMember "http://127.0.0.1:10080" route=1
    BalancerMember "http://192.168.1.7:10080" route=2
    ProxySet lbmethod=bytraffic
    ProxySet stickysession=ROUTEID
</Proxy>
<Proxy "balancer://lvapi">
    BalancerMember "http://127.0.0.1:10080" route=1
    BalancerMember "http://192.168.1.7:10080" route=2
    ProxySet lbmethod=bytraffic
    ProxySet stickysession=ROUTEID
</Proxy>
<Proxy "balancer://lvclient">
    BalancerMember "http://127.0.0.1:10080" route=1
    BalancerMember "http://192.168.1.7:10080" route=2
    ProxySet lbmethod=bytraffic
    ProxySet stickysession=ROUTEID
</Proxy>
<Proxy "balancer://lvstreaming/">
    BalancerMember "ws://127.0.0.1:10080" route=1
    BalancerMember "ws://192.168.1.7:10080" route=2
    ProxySet lbmethod=bytraffic
    ProxySet stickysession=ROUTEID
</Proxy>
<Proxy "balancer://lvweb">
    BalancerMember "http://127.0.0.1:10080" route=1
    BalancerMember "http://192.168.1.7:10080" route=2
    ProxySet lbmethod=bytraffic
    ProxySet stickysession=ROUTEID
</Proxy>

# Application Specific End-point

ProxyPass "/simple" "balancer://simple/simple"
ProxyPassReverse "/simple" "balancer://simple/simple"

# Platform Specific Redirects

ProxyPass "/lv/api" "balancer://lvapi/lv/api"
ProxyPassReverse "/lv/api" "balancer://lvapi/lv/api"

ProxyPass "/lv/client" "balancer://lvclient/lv/client"
ProxyPassReverse "/lv/client" "balancer://lvclient/lv/client"

ProxyPass "/lv/streaming/" "balancer://lvstreaming/lv/streaming/"
ProxyPassReverse "/lv/streaming/" "balancer://lvstreaming/lv/streaming/"

ProxyPass "/lvweb" "balancer://lvweb/lvweb"
ProxyPassReverse "/lvweb" "balancer://lvweb/lvweb"

Please see the Apache documentation for a description of each of these settings.
  https://httpd.apache.org/docs/2.4/mod/mod_proxy.html
  https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html#stickyness

  Apache mod_proxy documentation: 
  https://httpd.apache.org/docs/2.4/mod/mod_proxy.html
  https://httpd.apache.org/docs/2.4/mod/mod_proxy_balancer.html#stickyness