Update main.go

README_GO.md

@@ -15,14 +15,85 @@ export HAPROXY_TEMPLATE="./haproxy.tmpl"
 {{- range .backends }}
 
 backend {{ .Name }}
-  mode tcp
+  mode {{ .Mode }}
-  balance leastconn
+  balance {{ .Balance }}
-  cookie {{ .Name }} insert indirect nocache
+  {{- if .CookieName }}
+  cookie {{ .CookieName }} {{ .CookieFlags }}
+  {{- end }}
 
+  {{- if .HealthCheck }}
+  option httpchk GET {{ .HealthCheck }}
+  http-check expect status 200
+  {{- end }}
+
+  {{- $backend := . }}
   {{- range .Servers }}
-  server {{ .Name }} {{ .Address }}:{{ .Port }} check cookie {{ .Cookie }}
+  server {{ .Name }} {{ .Address }}:{{ .Port }}{{ if $backend.HealthCheck }} check{{ end }}{{ if $backend.CookieName }} cookie {{ .Cookie }}{{ end }}{{ if $backend.ServerOptions }} {{ $backend.ServerOptions }}{{ end }}
   {{- end }}
 
 {{- end }}
+```
+
+
+# Systemd Service and Timer
 
 ```
+[Unit]
+Description=HAProxy Config Generator
+After=network.target
+
+[Service]
+Type=oneshot
+Environment=KUBERNETES_HOST=https://10.0.20.7:6443
+Environment=KUBERNETES_TOKEN=eyJhbGciOi...
+Environment=KUBERNETES_VERIFYSSL=false
+Environment=HAPROXY_TEMPLATE=/etc/haproxy/haproxy.tmpl
+ExecStart=/bin/bash /etc/haproxy/haproxy-generator.sh
+
+```
+
+Timer for Systemd
+```
+[Unit]
+Description=Run HAProxy Config Generator every minute
+
+[Timer]
+OnBootSec=1min
+OnUnitActiveSec=1min
+Unit=haproxy-generator.service
+Persistent=true
+
+[Install]
+WantedBy=timers.target
+
+```
+
+# Reload Script for post start
+
+Copy the script to /etc/haproxy/haproxy-generator.sh
+```
+#!/bin/bash
+
+/usr/local/bin/haproxy-generator > /etc/haproxy/haproxy.cfg.new
+DIFF=$(diff /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.new)
+/sbin/haproxy -f /etc/haproxy/haproxy.cfg.new -c
+VALID=$?
+
+if [ "$DIFF" != "" ] && [ $VALID -eq 0 ]
+then
+    mv /etc/haproxy/haproxy.cfg.new /etc/haproxy/haproxy.cfg
+    /usr/sbin/service haproxy restart
+fi
+```
+
+# Service Annotations
+
+| Annotation-Key                 | Beschreibung                                                                | Typ     | Beispielwert               |
+|--------------------------------|-----------------------------------------------------------------------------|---------|---------------------------|
+| `haproxy/enabled`              | **Aktiviert** die Aufnahme des Services in die HAProxy-Konfiguration        | `bool`  | `"true"`                   |
+| `haproxy/mode`                 | Betriebsmodus des Backends (`tcp` oder `http`)                              | `string`| `"tcp"` / `"http"`         |
+| `haproxy/cookie-name`          | Name des Cookies zur Session-Persistenz                                     | `string`| `"SRVCOOKIE"`              |
+| `haproxy/cookie-flags`         | Zusätzliche Cookie-Optionen für HAProxy                                     | `string`| `"insert indirect nocache"`|
+| `haproxy/health-check`         | Deaktiviert Health-Checks, wenn `"false"` gesetzt wird                      | `bool`  | `"false"`                  |
+| `haproxy/server-options`       | Zusätzliche Optionen für die einzelnen `server`-Zeilen in HAProxy           | `string`| `"ssl verify none"`        |
+| `haproxy/port`                 | Nutze nur **diesen Port** des Services, wenn mehrere Ports definiert sind   | `int`   |`"8080"`                   |

main.go

@@ -30,6 +30,11 @@ type BackendServer struct {
 type Backend struct {
 	Name          string
 	Balance       string
+	Mode          string
+	CookieName    string
+	CookieFlags   string
+	HealthCheck   string
+	ServerOptions string
 	Servers       []BackendServer
 }
 
@@ -119,6 +124,7 @@ func main() {
 		Metadata struct {
 			Name        string            `json:"name"`
 			Namespace   string            `json:"namespace"`
+			Annotations map[string]string `json:"annotations"`
 		} `json:"metadata"`
 		Spec struct {
 			Type  string `json:"type"`
@@ -131,16 +137,13 @@ func main() {
 	type EndpointSubsetAddress struct {
 		IP string `json:"ip"`
 	}
-
 	type EndpointSubsetPort struct {
 		Port int `json:"port"`
 	}
-
 	type EndpointSubset struct {
 		Addresses []EndpointSubsetAddress `json:"addresses"`
 		Ports     []EndpointSubsetPort    `json:"ports"`
 	}
-
 	type Endpoint struct {
 		Metadata struct {
 			Name      string `json:"name"`
@@ -178,29 +181,55 @@ func main() {
 	backends := []Backend{}
 
 	for _, svc := range services {
-		if svc.Spec.Type != "Ingress" {
+		ann := svc.Metadata.Annotations
+		if val, ok := ann["haproxy/enabled"]; !ok || val != "true" {
 			continue
 		}
+
 		key := svc.Metadata.Namespace + "/" + svc.Metadata.Name
 		ep, found := endpointMap[key]
-		if !found || len(ep.Subsets) == 0 {
-			continue
-		}
 
 		b := Backend{
 			Name:        "SRV_" + strings.ReplaceAll(svc.Metadata.Name, " ", "-"),
 			Balance:     "leastconn",
+			Mode:        "tcp",
+			HealthCheck: "",
+		}
+
+		if val, ok := ann["haproxy/mode"]; ok && val != "" {
+			b.Mode = val
+		}
+		if val, ok := ann["haproxy/cookie-name"]; ok && val != "" {
+			b.CookieName = val
+		}
+		if val, ok := ann["haproxy/cookie-flags"]; ok && val != "" {
+			b.CookieFlags = val
+		}
+		if val, ok := ann["haproxy/health-check"]; ok && val != "" {
+			b.HealthCheck = val
+		}
+		if val, ok := ann["haproxy/server-options"]; ok && val != "" {
+			b.ServerOptions = val
+		}
+
+		targetPort := 0
+		if val, ok := ann["haproxy/port"]; ok && val != "" {
+			if p, err := strconv.Atoi(val); err == nil {
+				targetPort = p
+			}
 		}
 
 		servers := []BackendServer{}
-		serverIndex := 1
+
+		if found && len(ep.Subsets) > 0 {
 			for _, subset := range ep.Subsets {
 				for _, addr := range subset.Addresses {
 					for _, port := range subset.Ports {
+						if targetPort != 0 && port.Port != targetPort {
+							continue
+						}
 						cookie := hashString(fmt.Sprintf("%s-%s-%d", svc.Metadata.Name, addr.IP, port.Port))
-					serverName := fmt.Sprintf("%s_%d", svc.Metadata.Name, serverIndex)
+						serverName := fmt.Sprintf("%s_%d", svc.Metadata.Name, cookie)
-					serverIndex++
-
 						servers = append(servers, BackendServer{
 							Name:    serverName,
 							Address: addr.IP,
@@ -210,8 +239,9 @@ func main() {
 					}
 				}
 			}
-		b.Servers = servers
+		}
 
+		b.Servers = servers
 		backends = append(backends, b)
 	}
 
@@ -219,11 +249,11 @@ func main() {
 	if err != nil {
 		log.Fatalf("Failed to get absolute path: %v", err)
 	}
+	
 	tmpl, err := getTemplate(tmplAbsPath)
 	if err != nil {
 		log.Fatalf("Failed to parse template: %v", err)
 	}
-
 	err = tmpl.Execute(os.Stdout, map[string]interface{}{
 		"backends": backends,
 	})