Add support for sticky sessions

controllers/nginx/controller.go

@@ -694,6 +694,8 @@ func (lbc *loadBalancerController) getUpstreamServers(data []interface{}) ([]*ng
 	return aUpstreams, aServers
 }
 
+// createUpstreams creates the NGINX upstreams for each service referenced in
+// Ingress rules. The servers inside the upstream are endpoints.
 func (lbc *loadBalancerController) createUpstreams(data []interface{}) map[string]*nginx.Upstream {
 	upstreams := make(map[string]*nginx.Upstream)
 

controllers/nginx/nginx.tmpl

@@ -141,9 +141,13 @@ http {
 
     {{range $name, $upstream := .upstreams}}
     upstream {{$upstream.Name}} {
+        {{ if $cfg.enableStickySessions }}
+        sticky hash=sha1 httponly;
+        {{ else }}
         least_conn;
-        {{range $server := $upstream.Backends}}server {{$server.Address}}:{{$server.Port}};
-        {{end}}
+        {{ end }}
+        {{ range $server := $upstream.Backends }}server {{ $server.Address }}:{{ $server.Port }};
+        {{ end }}
     }
     {{end}}
 
@@ -153,9 +157,6 @@ http {
         {{ if $server.SSL }}listen 443{{ if $cfg.useProxyProtocol }} proxy_protocol{{ end }} ssl http2;
         ssl_certificate {{ $server.SSLCertificate }};
         ssl_certificate_key {{ $server.SSLCertificateKey }};{{ end }}
-        {{ if $cfg.enableVtsStatus }}
-        vhost_traffic_status_filter_by_set_key {{ $server.Name }} application::*;
-        {{ end }}
 
         server_name {{ $server.Name }};
 

controllers/nginx/nginx/main.go

@@ -89,6 +89,11 @@ type nginxConfiguration struct {
 	// Sets the maximum allowed size of the client request body
 	BodySize string `structs:"body-size,omitempty"`
 
+	// EnableStickySessions enabled sticky sessions using cookies
+	// https://bitbucket.org/nginx-goodies/nginx-sticky-module-ng
+	// By default this is disabled
+	EnableStickySessions bool `structs:"enable-sticky-sessions,omitempty"`
+
 	// EnableVtsStatus allows the replacement of the default status page with a third party module named
 	// nginx-module-vts - https://github.com/vozlt/nginx-module-vts
 	// By default this is disabled