httpd/koji: set MaxKeepAliveRequests 0 to fix 502 race condition

This acts as the second half of the fix for the 502 Bad Gateway errors
on long-running koji connections.

Fixes #12913

Signed-off-by: Victor Koycheff <victorkoycheff@gmail.com>

playbooks/include/proxies-reverseproxy.yml

@@ -13,7 +13,7 @@
   - import_tasks: "{{ handlers_path }}/restart_services.yml"
 
   vars:
-  - varnish_url: http://localhost:6081
+    varnish_url: http://localhost:6081
 
   pre_tasks:
 
@@ -661,6 +661,7 @@
     website: koji.fedoraproject.org
     destname: koji
     keephost: true
+    proxyopts: "keepalive=on ttl=10"
     balancer_name: koji
     balancer_members:
     - "koji01.{{ datacenter }}.fedoraproject.org"
@@ -674,6 +675,7 @@
     website: koji.fedoraproject.org
     destname: koji
     keephost: true
+    proxyopts: "keepalive=on ttl=10"
     balancer_name: koji
     balancer_members:
     - "koji01.stg.{{ datacenter }}.fedoraproject.org"

roles/httpd/proxy/templates/httpd.conf.j2

@@ -87,7 +87,7 @@ KeepAlive On
 # during a persistent connection. Set to 0 to allow an unlimited amount.
 # We recommend you leave this number high, for maximum performance.
 #
-MaxKeepAliveRequests 500
+MaxKeepAliveRequests 0
 
 #
 # KeepAliveTimeout: Number of seconds to wait for the next request from the

roles/koji_hub/templates/kojihub.conf.j2

@@ -3,6 +3,7 @@
 #
 
 KeepAlive On
+MaxKeepAliveRequests 0
 
 Alias /kojihub /usr/share/koji-hub/kojiapp.py
 

roles/koji_hub/templates/kojiweb.conf.j2

@@ -2,7 +2,7 @@ RewriteEngine On
 RewriteRule ^/$ /koji/  [R,L]
 KeepAlive On
 KeepAliveTimeout 16
-MaxKeepAliveRequests 500
+MaxKeepAliveRequests 0
 
 ServerLimit 2000
 MaxRequestWorkers 2000