generate systemd: do not set KillMode

`KillMode=none` has been deprecated in systemd and is now throwing big
warnings when being used.  Users have reported the issues upstream
(see #8615) and on the mailing list.

This deprecation was mainly motivated by an abusive use of third-party
vendors causing all kinds of undesired side-effects.  For instance, busy
mounts that delay reboot.

After talking to the systemd team, we came up with the following plan:

 **Short term**: we can use TimeoutStopSec and remove KillMode=none which
 will default to cgroup.

 **Long term**: we want to change the type to sdnotify. The plumbing for
 Podman is done but we need it for conmon. Once sdnotify is working, we
 can get rid of the pidfile handling etc. and let Podman handle it.
 Michal Seklatar came up with a nice idea that Podman increase the time
 out on demand. That's a much cleaner way than hard-coding the time out
 in the unit as suggest in the short-term solution.

This change is executing the short-term plan and sets a minimum timeout
of 60 seconds.  User-specified timeouts are added to that.

Fixes: #8615
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

pkg/systemd/generate/common.go

@@ -11,6 +11,11 @@ import (
 // is set to the unit's (unique) name.
 const EnvVariable = "PODMAN_SYSTEMD_UNIT"
 
+// minTimeoutStopSec is the minimal stop timeout for generated systemd units.
+// Once exceeded, processes of the services are killed and the cgroup(s) are
+// cleaned up.
+const minTimeoutStopSec = 60
+
 // RestartPolicies includes all valid restart policies to be used in a unit
 // file.
 var RestartPolicies = []string{"no", "on-success", "on-failure", "on-abnormal", "on-watchdog", "on-abort", "always"}

pkg/systemd/generate/containers.go

@@ -55,6 +55,8 @@ type containerInfo struct {
 	ExecStartPre string
 	// ExecStart of the unit.
 	ExecStart string
+	// TimeoutStopSec of the unit.
+	TimeoutStopSec uint
 	// ExecStop of the unit.
 	ExecStop string
 	// ExecStopPost of the unit.
@@ -74,6 +76,7 @@ After={{- range $index, $value := .BoundToServices -}}{{if $index}} {{end}}{{ $v
 [Service]
 Environment={{.EnvVariable}}=%n
 Restart={{.RestartPolicy}}
+TimeoutStopSec={{.TimeoutStopSec}}
 {{- if .ExecStartPre}}
 ExecStartPre={{.ExecStartPre}}
 {{- end}}
@@ -81,7 +84,6 @@ ExecStart={{.ExecStart}}
 ExecStop={{.ExecStop}}
 ExecStopPost={{.ExecStopPost}}
 PIDFile={{.PIDFile}}
-KillMode=none
 Type=forking
 
 [Install]
@@ -255,6 +257,8 @@ func executeContainerTemplate(info *containerInfo, options entities.GenerateSyst
 		info.ExecStopPost = "{{.Executable}} rm --ignore -f --cidfile {{.ContainerIDFile}}"
 	}
 
+	info.TimeoutStopSec = minTimeoutStopSec + info.StopTimeout
+
 	if info.PodmanVersion == "" {
 		info.PodmanVersion = version.Version.String()
 	}

pkg/systemd/generate/containers_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/containers/podman/v2/pkg/domain/entities"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestValidateRestartPolicyContainer(t *testing.T) {
@@ -48,11 +49,11 @@ After=network-online.target
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=82
 ExecStart=/usr/bin/podman start 639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401
-ExecStop=/usr/bin/podman stop -t 10 639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401
+ExecStop=/usr/bin/podman stop -t 22 639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401
-ExecStopPost=/usr/bin/podman stop -t 10 639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401
+ExecStopPost=/usr/bin/podman stop -t 22 639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401
 PIDFile=/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -71,11 +72,11 @@ After=network-online.target
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=70
 ExecStart=/usr/bin/podman start foobar
 ExecStop=/usr/bin/podman stop -t 10 foobar
 ExecStopPost=/usr/bin/podman stop -t 10 foobar
 PIDFile=/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -96,11 +97,11 @@ After=a.service b.service c.service pod.service
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=70
 ExecStart=/usr/bin/podman start foobar
 ExecStop=/usr/bin/podman stop -t 10 foobar
 ExecStopPost=/usr/bin/podman stop -t 10 foobar
 PIDFile=/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -119,12 +120,12 @@ After=network-online.target
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=70
 ExecStartPre=/bin/rm -f %t/jadda-jadda.pid %t/jadda-jadda.ctr-id
 ExecStart=/usr/bin/podman run --conmon-pidfile %t/jadda-jadda.pid --cidfile %t/jadda-jadda.ctr-id --cgroups=no-conmon -d --replace --name jadda-jadda --hostname hello-world awesome-image:latest command arg1 ... argN "foo=arg \"with \" space"
-ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 42
+ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 10
 ExecStopPost=/usr/bin/podman rm --ignore -f --cidfile %t/jadda-jadda.ctr-id
 PIDFile=%t/jadda-jadda.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -143,12 +144,12 @@ After=network-online.target
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=70
 ExecStartPre=/bin/rm -f %t/jadda-jadda.pid %t/jadda-jadda.ctr-id
 ExecStart=/usr/bin/podman run --conmon-pidfile %t/jadda-jadda.pid --cidfile %t/jadda-jadda.ctr-id --cgroups=no-conmon --replace -d --name jadda-jadda --hostname hello-world awesome-image:latest command arg1 ... argN
-ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 42
+ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 10
 ExecStopPost=/usr/bin/podman rm --ignore -f --cidfile %t/jadda-jadda.ctr-id
 PIDFile=%t/jadda-jadda.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -167,12 +168,12 @@ After=network-online.target
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=70
 ExecStartPre=/bin/rm -f %t/jadda-jadda.pid %t/jadda-jadda.ctr-id
 ExecStart=/usr/bin/podman run --conmon-pidfile %t/jadda-jadda.pid --cidfile %t/jadda-jadda.ctr-id --cgroups=no-conmon --pod-id-file /tmp/pod-foobar.pod-id-file --replace -d --name jadda-jadda --hostname hello-world awesome-image:latest command arg1 ... argN
-ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 42
+ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 10
 ExecStopPost=/usr/bin/podman rm --ignore -f --cidfile %t/jadda-jadda.ctr-id
 PIDFile=%t/jadda-jadda.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -191,12 +192,12 @@ After=network-online.target
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=70
 ExecStartPre=/bin/rm -f %t/jadda-jadda.pid %t/jadda-jadda.ctr-id
 ExecStart=/usr/bin/podman run --conmon-pidfile %t/jadda-jadda.pid --cidfile %t/jadda-jadda.ctr-id --cgroups=no-conmon --replace --detach --name jadda-jadda --hostname hello-world awesome-image:latest command arg1 ... argN
-ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 42
+ExecStop=/usr/bin/podman stop --ignore --cidfile %t/jadda-jadda.ctr-id -t 10
 ExecStopPost=/usr/bin/podman rm --ignore -f --cidfile %t/jadda-jadda.ctr-id
 PIDFile=%t/jadda-jadda.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -215,12 +216,12 @@ After=network-online.target
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=70
 ExecStartPre=/bin/rm -f %t/container-639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401.pid %t/container-639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401.ctr-id
 ExecStart=/usr/bin/podman run --conmon-pidfile %t/container-639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401.pid --cidfile %t/container-639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401.ctr-id --cgroups=no-conmon -d awesome-image:latest
 ExecStop=/usr/bin/podman stop --ignore --cidfile %t/container-639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401.ctr-id -t 10
 ExecStopPost=/usr/bin/podman rm --ignore -f --cidfile %t/container-639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401.ctr-id
 PIDFile=%t/container-639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -242,7 +243,7 @@ WantedBy=multi-user.target default.target
 				ContainerNameOrID: "639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401",
 				RestartPolicy:     "always",
 				PIDFile:           "/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
-				StopTimeout:       10,
+				StopTimeout:       22,
 				PodmanVersion:     "CI",
 				EnvVariable:       EnvVariable,
 			},
@@ -302,7 +303,7 @@ WantedBy=multi-user.target default.target
 				ContainerNameOrID: "jadda-jadda",
 				RestartPolicy:     "always",
 				PIDFile:           "/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
-				StopTimeout:       42,
+				StopTimeout:       10,
 				PodmanVersion:     "CI",
 				CreateCommand:     []string{"I'll get stripped", "container", "run", "--name", "jadda-jadda", "--hostname", "hello-world", "awesome-image:latest", "command", "arg1", "...", "argN", "foo=arg \"with \" space"},
 				EnvVariable:       EnvVariable,
@@ -318,7 +319,7 @@ WantedBy=multi-user.target default.target
 				ContainerNameOrID: "jadda-jadda",
 				RestartPolicy:     "always",
 				PIDFile:           "/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
-				StopTimeout:       42,
+				StopTimeout:       10,
 				PodmanVersion:     "CI",
 				CreateCommand:     []string{"I'll get stripped", "container", "run", "-d", "--name", "jadda-jadda", "--hostname", "hello-world", "awesome-image:latest", "command", "arg1", "...", "argN"},
 				EnvVariable:       EnvVariable,
@@ -334,7 +335,7 @@ WantedBy=multi-user.target default.target
 				ContainerNameOrID: "jadda-jadda",
 				RestartPolicy:     "always",
 				PIDFile:           "/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
-				StopTimeout:       42,
+				StopTimeout:       10,
 				PodmanVersion:     "CI",
 				CreateCommand:     []string{"I'll get stripped", "container", "run", "-d", "--name", "jadda-jadda", "--hostname", "hello-world", "awesome-image:latest", "command", "arg1", "...", "argN"},
 				EnvVariable:       EnvVariable,
@@ -353,7 +354,7 @@ WantedBy=multi-user.target default.target
 				ContainerNameOrID: "jadda-jadda",
 				RestartPolicy:     "always",
 				PIDFile:           "/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
-				StopTimeout:       42,
+				StopTimeout:       10,
 				PodmanVersion:     "CI",
 				CreateCommand:     []string{"I'll get stripped", "container", "run", "--detach", "--name", "jadda-jadda", "--hostname", "hello-world", "awesome-image:latest", "command", "arg1", "...", "argN"},
 				EnvVariable:       EnvVariable,
@@ -390,9 +391,7 @@ WantedBy=multi-user.target default.target
 				t.Errorf("CreateContainerSystemdUnit() error = \n%v, wantErr \n%v", err, test.wantErr)
 				return
 			}
-			if got != test.want {
+			assert.Equal(t, test.want, got)
-				t.Errorf("CreateContainerSystemdUnit() = \n%v\n---------> want\n%v", got, test.want)
-			}
 		})
 	}
 }

pkg/systemd/generate/pods.go

@@ -60,6 +60,8 @@ type podInfo struct {
 	ExecStartPre2 string
 	// ExecStart of the unit.
 	ExecStart string
+	// TimeoutStopSec of the unit.
+	TimeoutStopSec uint
 	// ExecStop of the unit.
 	ExecStop string
 	// ExecStopPost of the unit.
@@ -72,6 +74,7 @@ Before={{- range $index, $value := .RequiredServices -}}{{if $index}} {{end}}{{
 [Service]
 Environment={{.EnvVariable}}=%n
 Restart={{.RestartPolicy}}
+TimeoutStopSec={{.TimeoutStopSec}}
 {{- if .ExecStartPre1}}
 ExecStartPre={{.ExecStartPre1}}
 {{- end}}
@@ -82,7 +85,6 @@ ExecStart={{.ExecStart}}
 ExecStop={{.ExecStop}}
 ExecStopPost={{.ExecStopPost}}
 PIDFile={{.PIDFile}}
-KillMode=none
 Type=forking
 
 [Install]
@@ -298,6 +300,8 @@ func executePodTemplate(info *podInfo, options entities.GenerateSystemdOptions)
 		info.ExecStop = "{{.Executable}} pod stop --ignore --pod-id-file {{.PodIDFile}} {{if (ge .StopTimeout 0)}}-t {{.StopTimeout}}{{end}}"
 		info.ExecStopPost = "{{.Executable}} pod rm --ignore -f --pod-id-file {{.PodIDFile}}"
 	}
+	info.TimeoutStopSec = minTimeoutStopSec + info.StopTimeout
+
 	if info.PodmanVersion == "" {
 		info.PodmanVersion = version.Version.String()
 	}

pkg/systemd/generate/pods_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/containers/podman/v2/pkg/domain/entities"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestValidateRestartPolicyPod(t *testing.T) {
@@ -50,11 +51,11 @@ Before=container-1.service container-2.service
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=always
+TimeoutStopSec=102
 ExecStart=/usr/bin/podman start jadda-jadda-infra
-ExecStop=/usr/bin/podman stop -t 10 jadda-jadda-infra
+ExecStop=/usr/bin/podman stop -t 42 jadda-jadda-infra
-ExecStopPost=/usr/bin/podman stop -t 10 jadda-jadda-infra
+ExecStopPost=/usr/bin/podman stop -t 42 jadda-jadda-infra
 PIDFile=/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -75,13 +76,13 @@ Before=container-1.service container-2.service
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n
 Restart=on-failure
+TimeoutStopSec=70
 ExecStartPre=/bin/rm -f %t/pod-123abc.pid %t/pod-123abc.pod-id
 ExecStartPre=/usr/bin/podman pod create --infra-conmon-pidfile %t/pod-123abc.pid --pod-id-file %t/pod-123abc.pod-id --name foo "bar=arg with space" --replace
 ExecStart=/usr/bin/podman pod start --pod-id-file %t/pod-123abc.pod-id
 ExecStop=/usr/bin/podman pod stop --ignore --pod-id-file %t/pod-123abc.pod-id -t 10
 ExecStopPost=/usr/bin/podman pod rm --ignore -f --pod-id-file %t/pod-123abc.pod-id
 PIDFile=%t/pod-123abc.pid
-KillMode=none
 Type=forking
 
 [Install]
@@ -102,7 +103,7 @@ WantedBy=multi-user.target default.target
 				InfraNameOrID:    "jadda-jadda-infra",
 				RestartPolicy:    "always",
 				PIDFile:          "/var/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
-				StopTimeout:      10,
+				StopTimeout:      42,
 				PodmanVersion:    "CI",
 				RequiredServices: []string{"container-1", "container-2"},
 			},
@@ -139,9 +140,7 @@ WantedBy=multi-user.target default.target
 				t.Errorf("CreatePodSystemdUnit() error = \n%v, wantErr \n%v", err, test.wantErr)
 				return
 			}
-			if got != test.want {
+			assert.Equal(t, test.want, got)
-				t.Errorf("CreatePodSystemdUnit() = \n%v\n---------> want\n%v", got, test.want)
-			}
 		})
 	}
 }

test/e2e/generate_systemd_test.go

@@ -74,6 +74,9 @@ var _ = Describe("Podman generate systemd", func() {
 
 		found, _ := session.GrepString(" stop -t 1234 ")
 		Expect(found).To(BeTrue())
+
+		found, _ = session.GrepString("TimeoutStopSec=1294")
+		Expect(found).To(BeTrue())
 	})
 
 	It("podman generate systemd", func() {