proxmox: allow consoles to also be load balance reverse proxied

Author: spacelama

files/etc/apache2.webserver.ext/sites-enabled/2-pve.conf

@@ -65,9 +65,11 @@
     <IfModule mod_proxy_balancer.c>
 
         <Proxy "balancer://pvecluster">
-            BalancerMember "https://pve1:8006"
-            BalancerMember "https://pve2:8006" loadfactor=2
-            BalancerMember "https://pve3:8006" loadfactor=5
+            BalancerMember "https://pve1:8006" route=1 keepalive=On smax=1 connectiontimeout=10 retry=600 timeout=900 ttl=900 upgrade=websocket
+            BalancerMember "https://pve2:8006" route=2 keepalive=On smax=1 connectiontimeout=10 retry=600 timeout=900 ttl=900 upgrade=websocket loadfactor=2
+            BalancerMember "https://pve3:8006" route=3 keepalive=On smax=1 connectiontimeout=10 retry=600 timeout=900 ttl=900 upgrade=websocket loadfactor=5
+            ProxySet stickysession=ROUTEID
+            # ProxySet lbmethod=byrequests
         </Proxy>
 
     </IfModule>
@@ -80,19 +82,28 @@
 
         SSLProxyEngine On
 
-        SetEnv force-proxy-request-1.0 1
-        SetEnv proxy-nokeepalive 1
+        # don't know the original author's motivation for saying force-proxy-request-1.0, but it seems to be incompatible with websocket proxies
+        #SetEnv force-proxy-request-1.0 1
+        #SetEnv proxy-nokeepalive 1
 
         SSLProxyVerify none
         SSLProxyCheckPeerCN off
         SSLProxyCheckPeerName off
         SSLProxyCheckPeerExpire off
 
-        # a lot of this config came
-        # from https://forum.proxmox.com/threads/config-dump-apache-load-balancer-fail-over-and-reverse-proxy.131217/
-        # but some straight from https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxyrequests
-        ProxyPass "/" "balancer://pvecluster/" stickysession=JSESSIONID|jsessionid nofailover=On
-        ProxyPassReverse "/" "balancer://pvecluster/"
+        <Location / >
+
+           # Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/; HttpOnly" env=BALANCER_ROUTE_CHANGED
+
+           # a lot of this config came
+           # from https://forum.proxmox.com/threads/config-dump-apache-load-balancer-fail-over-and-reverse-proxy.131217/
+           # but some straight from https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxyrequests
+           # The combination of reverseproxy, load balancer, sticky sessions is not very well documented,
+           # and I ended up adapting this: https://vaadin.com/docs/latest/flow/production/reverse-proxy
+           ProxyPass "balancer://pvecluster/" stickysession=ROUTEID nofailover=On
+           # upgrade=websocket
+           ProxyPassReverse "balancer://pvecluster/"
+        </Location>
 
     </IfModule>