mpm_event module to improve apache scalability

Change-Id: I2ec0dbe6c07a0c510a5f9c43a1b389630464d625

tools/container/huelb/hue_httpd_template

@@ -7,6 +7,7 @@ LoadModule lbmethod_byrequests_module /etc/httpd/modules/mod_lbmethod_byrequests
 LoadModule authz_core_module /etc/httpd/modules/mod_authz_core.so
 LoadModule log_config_module /etc/httpd/modules/mod_log_config.so
 LoadModule mime_module /etc/httpd/modules/mod_mime.so
+LoadModule mpm_event_module /etc/httpd/modules/mpm_event_module.so
 
 ErrorLog "${HUE_LOG_DIR}/httpd_error_log"
 LogLevel warn
@@ -17,6 +18,16 @@ LogLevel warn
   CustomLog "${HUE_LOG_DIR}/httpd_access_log" common
 </IfModule>
 
+<IfModule mpm_event_module>
+  ServerLimit             5000
+  StartServers            1000
+  MaxClients              10000
+  MinSpareThreads         750
+  MaxSpareThreads         2500
+  ThreadsPerChild         500
+  MaxRequestsPerChild     10000
+</IfModule>
+
 <IfModule mime_module>
   TypesConfig /etc/mime.types
   AddType application/x-compress .Z
@@ -44,6 +55,10 @@ ProxyPass / balancer://hue/ stickysession=ROUTEID
 SetEnv proxy-initial-not-pooled 1
 ProxyTimeout 900
 
+KeepAlive On
+KeepAliveTimeout 120
+MaxKeepAliveRequests 500
+
 AllowEncodedSlashes NoDecode
 User ${HUEUSER}
 Group ${HUEUSER}