Create UDP collector that listens to UDP messages from monitor.lua and exposes them on /metrics endpoint

internal/ingress/controller/util.go

@@ -17,6 +17,8 @@ limitations under the License.
 package controller
 
 import (
+	"os"
+	"os/exec"
 	"syscall"
 
 	"github.com/golang/glog"
@@ -66,3 +68,28 @@ func sysctlFSFileMax() int {
 	glog.V(2).Infof("rlimit.max=%v", rLimit.Max)
 	return int(rLimit.Max)
 }
+
+const (
+	defBinary = "/usr/sbin/nginx"
+	cfgPath   = "/etc/nginx/nginx.conf"
+)
+
+func nginxExecCommand(args ...string) *exec.Cmd {
+	ngx := os.Getenv("NGINX_BINARY")
+	if ngx == "" {
+		ngx = defBinary
+	}
+
+	cmdArgs := []string{"-c", cfgPath}
+	cmdArgs = append(cmdArgs, args...)
+	return exec.Command(ngx, cmdArgs...)
+}
+
+func nginxTestCommand(cfg string) *exec.Cmd {
+	ngx := os.Getenv("NGINX_BINARY")
+	if ngx == "" {
+		ngx = defBinary
+	}
+
+	return exec.Command(ngx, "-c", cfg, "-t")
+}