MEDIUM: remove restart of HAProxy

pkg/controller/controller.go

@@ -196,15 +196,7 @@ func (c *HAProxyController) updateHAProxy() {
 		c.setToReady()
 	}
 
-	switch {
-	case instance.NeedRestart():
-		if err = c.haproxy.Service("restart"); err != nil {
-			logger.Error(err)
-		} else {
-			logger.Info("HAProxy restarted")
-		}
-		c.prometheusMetricsManager.UpdateRestartMetrics(err)
-	case instance.NeedReload():
+	if instance.NeedReload() {
 		if err = c.haproxy.Service("reload"); err != nil {
 			logger.Error(err)
 		} else {

pkg/controller/global.go

@@ -90,12 +90,12 @@ func (c *HAProxyController) globalCfg() {
 	diff := newGlobal.Diff(*global)
 	if len(diff) != 0 {
 		logger.Error(c.haproxy.GlobalPushConfiguration(*newGlobal))
-		instance.Restart("Global config updated: %+v", diff)
+		instance.Reload("Global config updated: %+v", diff)
 	}
 	diff = newLg.Diff(lg)
 	if len(diff) != 0 {
 		logger.Error(c.haproxy.GlobalPushLogTargets(newLg))
-		instance.Restart("Global log targets updated: %+v", diff)
+		instance.Reload("Global log targets updated: %+v", diff)
 	}
 	c.globalCfgSnipp()
 }
@@ -110,7 +110,7 @@ func (c *HAProxyController) globalCfgSnipp() {
 	}
 	updatedSnipp, errSnipp := annotations.UpdateGlobalCfgSnippet(c.haproxy)
 	logger.Error(errSnipp)
-	instance.RestartIf(len(updatedSnipp) != 0,
+	instance.ReloadIf(len(updatedSnipp) != 0,
 		"Global config-snippet updated: %s", strings.Join(updatedSnipp, "\n"))
 
 	updatedSnipp, errSnipp = annotations.UpdateFrontendCfgSnippet(c.haproxy, "http", "https", "stats")

pkg/controller/monitor.go

@@ -34,7 +34,7 @@ func (c *HAProxyController) SyncData() {
 		case k8ssync.COMMAND:
 			c.auxCfgManager()
 			// create a NeedAction function.
-			if hadChanges || instance.NeedAction() {
+			if hadChanges || instance.NeedReload() {
 				c.updateHAProxy()
 				hadChanges = false
 				continue
@@ -97,7 +97,6 @@ func (c *HAProxyController) SyncData() {
 	}
 }
 
-// auxCfgManager returns restart or reload requirement based on state and transition of auxiliary configuration file.
 func (c *HAProxyController) auxCfgManager() {
 	info, errStat := os.Stat(c.haproxy.AuxCFGFile)
 	var (
@@ -115,7 +114,7 @@ func (c *HAProxyController) auxCfgManager() {
 		c.haproxy.SetAuxCfgFile(auxCfgFile)
 		c.haproxy.UseAuxFile(useAuxFile)
 		// The file exists now  (modifTime !=0 otherwise nothing changed case).
-		instance.RestartIf(c.auxCfgModTime == 0, "auxiliary configuration file created")
+		instance.ReloadIf(c.auxCfgModTime == 0, "auxiliary configuration file created")
 		instance.ReloadIf(c.auxCfgModTime != 0, "auxiliary configuration file modified")
 		c.auxCfgModTime = modifTime
 		if c.auxCfgModTime != 0 {
@@ -131,7 +130,7 @@ func (c *HAProxyController) auxCfgManager() {
 			// never existed before
 			return
 		}
-		instance.Restart("Auxiliary HAProxy config '%s' removed", c.haproxy.AuxCFGFile)
+		instance.Reload("Auxiliary HAProxy config '%s' removed", c.haproxy.AuxCFGFile)
 		return
 	}
 	// File exists

pkg/haproxy/instance/configuration.go

@@ -13,37 +13,21 @@ func Reload(reason string, args ...any) {
 	DefaultConfigurationManager.SetReload(reason, args...)
 }
 
-func Restart(reason string, args ...any) {
-	DefaultConfigurationManager.SetRestart(reason, args...)
-}
-
 func ReloadIf(reload bool, reason string, args ...any) {
 	DefaultConfigurationManager.SetReloadIf(reload, reason, args...)
 }
 
-func RestartIf(restart bool, reason string, args ...any) {
-	DefaultConfigurationManager.SetRestartIf(restart, reason, args...)
-}
-
 func NeedReload() bool {
 	return DefaultConfigurationManager.NeedReload()
 }
 
-func NeedRestart() bool {
-	return DefaultConfigurationManager.NeedRestart()
-}
-
 func Reset() {
 	DefaultConfigurationManager.Reset()
 }
 
-func NeedAction() bool {
-	return DefaultConfigurationManager.NeedAction()
-}
-
 type configurationManagerImpl struct {
-	logger          utils.Logger
-	reload, restart bool
+	logger utils.Logger
+	reload bool
 }
 
 func NewConfigurationManager() *configurationManagerImpl {
@@ -60,27 +44,14 @@ func (cmi *configurationManagerImpl) SetReload(reason string, args ...any) {
 	cmi.logger.InfoSkipCallerf("reload required : "+reason, args...)
 }
 
-func (cmi *configurationManagerImpl) SetRestart(reason string, args ...any) {
-	cmi.restart = true
-	if !cmi.validReason(reason) {
-		return
-	}
-	cmi.logger.InfoSkipCallerf("restart required : "+reason, args...)
-}
-
 func (cmi *configurationManagerImpl) Reset() {
 	cmi.reload = false
-	cmi.restart = false
 }
 
 func (cmi *configurationManagerImpl) NeedReload() bool {
 	return cmi.reload
 }
 
-func (cmi *configurationManagerImpl) NeedRestart() bool {
-	return cmi.restart
-}
-
 func (cmi *configurationManagerImpl) SetReloadIf(reload bool, reason string, args ...any) {
 	if !reload {
 		return
@@ -92,21 +63,6 @@ func (cmi *configurationManagerImpl) SetReloadIf(reload bool, reason string, arg
 	cmi.logger.InfoSkipCallerf("reload required : "+reason, args...)
 }
 
-func (cmi *configurationManagerImpl) SetRestartIf(restart bool, reason string, args ...any) {
-	if !restart {
-		return
-	}
-	cmi.restart = true
-	if !cmi.validReason(reason) {
-		return
-	}
-	cmi.logger.InfoSkipCallerf("restart required : "+reason, args...)
-}
-
-func (cmi *configurationManagerImpl) NeedAction() bool {
-	return cmi.NeedReload() || cmi.NeedRestart()
-}
-
 func (cmi *configurationManagerImpl) validReason(reason string) bool {
 	if reason == "" {
 		errMsg := "empty reason for reload"

pkg/haproxy/process/direct-control.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
-	"strconv"
 	"syscall"
 
 	"github.com/haproxytech/kubernetes-ingress/pkg/haproxy/api"
@@ -61,19 +60,6 @@ func (d *directControl) Service(action string) (err error) {
 			return d.Service("start")
 		}
 		return process.Signal(syscall.SIGUSR2)
-	case "restart":
-		if processErr != nil {
-			logger.Errorf("haproxy is not running, trying to start it")
-			return d.Service("start")
-		}
-		pid := strconv.Itoa(process.Pid)
-		cmd = exec.Command(d.Env.Binary, "-S", masterSocketArg, "-f", d.Env.MainCFGFile, "-sf", pid)
-		if d.useAuxFile {
-			cmd = exec.Command(d.Env.Binary, "-S", masterSocketArg, "-f", d.Env.MainCFGFile, "-f", d.Env.AuxCFGFile, "-sf", pid)
-		}
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-		return cmd.Start()
 	default:
 		return fmt.Errorf("unknown command '%s'", action)
 	}

pkg/haproxy/process/pebble.go

@@ -67,11 +67,6 @@ func (d *pebbleControl) Service(action string) error {
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
 		return cmd.Run()
-	case "restart":
-		cmd = exec.Command("pebble", "restart", "haproxy")
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-		return cmd.Run()
 	default:
 		return fmt.Errorf("unknown command '%s'", action)
 	}

pkg/haproxy/process/s6-overlay.go

@@ -69,11 +69,6 @@ func (d *s6Control) Service(action string) error {
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
 		return cmd.Run()
-	case "restart":
-		cmd = exec.Command("s6-svc", "-t", "/run/service/haproxy")
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-		return cmd.Run()
 	default:
 		return fmt.Errorf("unknown command '%s'", action)
 	}

pkg/metrics/prometheus.go

@@ -18,9 +18,6 @@ type PrometheusMetricsManager struct {
 	// reload
 	reloadsCounterVec *prometheus.CounterVec
 
-	// restart
-	restartsCounterVec *prometheus.CounterVec
-
 	// runtime socket
 	runtimeSocketCounterVec *prometheus.CounterVec
 }
@@ -41,15 +38,6 @@ func New() PrometheusMetricsManager {
 			[]string{"result"},
 		)
 
-		// restart
-		restartCounter := promauto.NewCounterVec(
-			prometheus.CounterOpts{
-				Name: "haproxy_restarts_total",
-				Help: "The number of haproxy restarts partitioned by result (success/failure)",
-			},
-			[]string{"result"},
-		)
-
 		// runtime socket
 		runtimeSocketCounter := promauto.NewCounterVec(
 			prometheus.CounterOpts{
@@ -61,21 +49,12 @@ func New() PrometheusMetricsManager {
 
 		pmm = PrometheusMetricsManager{
 			reloadsCounterVec:       reloadCounter,
-			restartsCounterVec:      restartCounter,
 			runtimeSocketCounterVec: runtimeSocketCounter,
 		}
 	})
 	return pmm
 }
 
-func (pmm PrometheusMetricsManager) UpdateRestartMetrics(err error) {
-	if err != nil {
-		pmm.restartsCounterVec.WithLabelValues(ResultFailure).Inc()
-	} else {
-		pmm.restartsCounterVec.WithLabelValues(ResultSuccess).Inc()
-	}
-}
-
 func (pmm PrometheusMetricsManager) UpdateReloadMetrics(err error) {
 	if err != nil {
 		pmm.reloadsCounterVec.WithLabelValues(ResultFailure).Inc()