Re: [systemd-devel] start service in multi-user.target but don't stop it on isolate

Jérémy Rosen Tue, 20 Mar 2018 02:43:29 -0700

naive question, but why are you not using systemd's handling of hardwaredaemon (see man:system.conf for how to activate it)

basically, systemd is monitored by the hardware daemon and systemdmonitors (via its software watchdog) any service that wants to be monitored

this creates a better chain of trust (I think) than an external daemonand would do what you want...


On 19/03/2018 14:39, Alexander 'Leo' Bergolth wrote:

Hi!

I am using the software watchdog daemon together with a watchdog device in 
"nowayout" mode.
Thus once started, the watchdog daemon should never be stopped or the box will 
be rebooted.

watchdog.service is WantedBy multi-user.target and when changing e.g. to 
rescue.target, it should stay active.

I tried to configure this using IgnoreOnIsolate=true but this doesn't show the 
desired effect.
On "systemd isolate rescue.target", watchdog.service still gets stopped:
-------------------- 8< --------------------
Mar 19 13:44:02 strike watchdog[1291]: stopping daemon (5.13)
Mar 19 13:44:02 strike systemd[1]: Stopping watchdog daemon...
-------------------- 8< --------------------

What did I do wrong?

Cheers,
--leo


I am using systemd-219-42.el7_4.7.x86_64 on Centos 7.

-------------------- 8< --------------------
# systemctl cat watchdog.service
# /usr/lib/systemd/system/watchdog.service
[Unit]
Description=watchdog daemon
# man systemd.special
# auto added After=basic.target

[Service]
Type=forking
ExecStart=/usr/sbin/watchdog
ControlGroup=cpu:/

[Install]
WantedBy=multi-user.target

# /etc/systemd/system/watchdog.service.d/override.conf
[Unit]
IgnoreOnIsolate=true

-------------------- 8< --------------------
# systemctl status watchdog.service
* watchdog.service - watchdog daemon
    Loaded: loaded (/usr/lib/systemd/system/watchdog.service; enabled; vendor 
preset: disabled)
   Drop-In: /etc/systemd/system/watchdog.service.d
            `-override.conf
    Active: inactive (dead) since Mon 2018-03-19 13:44:07 CET; 23min ago
   Process: 1267 ExecStart=/usr/sbin/watchdog (code=exited, status=0/SUCCESS)
  Main PID: 1291 (code=exited, status=0/SUCCESS)

-------------------- 8< --------------------
# systemctl show watchdog.service
Type=forking
Restart=no
NotifyAccess=none
RestartUSec=100ms
TimeoutStartUSec=1min 30s
TimeoutStopUSec=1min 30s
WatchdogUSec=0
WatchdogTimestampMonotonic=0
StartLimitInterval=10000000
StartLimitBurst=5
StartLimitAction=none
FailureAction=none
PermissionsStartOnly=no
RootDirectoryStartOnly=no
RemainAfterExit=no
GuessMainPID=yes
MainPID=0
ControlPID=0
FileDescriptorStoreMax=0
StatusErrno=0
Result=success
ExecMainStartTimestamp=Mon 2018-03-19 13:42:22 CET
ExecMainStartTimestampMonotonic=15052342
ExecMainExitTimestamp=Mon 2018-03-19 13:44:07 CET
ExecMainExitTimestampMonotonic=119544736
ExecMainPID=1291
ExecMainCode=1
ExecMainStatus=0
ExecStart={ path=/usr/sbin/watchdog ; argv[]=/usr/sbin/watchdog ; 
ignore_errors=no ; start_time=[Mon 2018-03-19 13:42:22 CET] ; stop_time=[Mon 
2018-03-19 13:42:22 CET] ; pid=12
Slice=system.slice
MemoryCurrent=18446744073709551615
TasksCurrent=18446744073709551615
Delegate=no
CPUAccounting=no
CPUShares=18446744073709551615
StartupCPUShares=18446744073709551615
CPUQuotaPerSecUSec=infinity
BlockIOAccounting=no
BlockIOWeight=18446744073709551615
StartupBlockIOWeight=18446744073709551615
MemoryAccounting=no
MemoryLimit=18446744073709551615
DevicePolicy=auto
TasksAccounting=no
TasksMax=18446744073709551615
UMask=0022
LimitCPU=18446744073709551615
LimitFSIZE=18446744073709551615
LimitDATA=18446744073709551615
LimitSTACK=18446744073709551615
LimitCORE=18446744073709551615
LimitRSS=18446744073709551615
LimitNOFILE=4096
LimitAS=18446744073709551615
LimitNPROC=63090
LimitMEMLOCK=65536
LimitLOCKS=18446744073709551615
LimitSIGPENDING=63090
LimitMSGQUEUE=819200
LimitNICE=0
LimitRTPRIO=0
Type=forking
Restart=no
NotifyAccess=none
RestartUSec=100ms
TimeoutStartUSec=1min 30s
TimeoutStopUSec=1min 30s
WatchdogUSec=0
WatchdogTimestampMonotonic=0
StartLimitInterval=10000000
StartLimitBurst=5
StartLimitAction=none
FailureAction=none
PermissionsStartOnly=no
RootDirectoryStartOnly=no
RemainAfterExit=no
GuessMainPID=yes
MainPID=0
ControlPID=0
FileDescriptorStoreMax=0
StatusErrno=0
Result=success
ExecMainStartTimestamp=Mon 2018-03-19 13:42:22 CET
ExecMainStartTimestampMonotonic=15052342
ExecMainExitTimestamp=Mon 2018-03-19 13:44:07 CET
ExecMainExitTimestampMonotonic=119544736
ExecMainPID=1291
ExecMainCode=1
ExecMainStatus=0
ExecStart={ path=/usr/sbin/watchdog ; argv[]=/usr/sbin/watchdog ; 
ignore_errors=no ; start_time=[Mon 2018-03-19 13:42:22 CET] ; stop_time=[Mon 
2018-03-19 13:42:22 CET] ; pid=12
Slice=system.slice
MemoryCurrent=18446744073709551615
TasksCurrent=18446744073709551615
Delegate=no
CPUAccounting=no
CPUShares=18446744073709551615
StartupCPUShares=18446744073709551615
CPUQuotaPerSecUSec=infinity
BlockIOAccounting=no
BlockIOWeight=18446744073709551615
StartupBlockIOWeight=18446744073709551615
MemoryAccounting=no
MemoryLimit=18446744073709551615
DevicePolicy=auto
TasksAccounting=no
TasksMax=18446744073709551615
UMask=0022
LimitCPU=18446744073709551615
LimitFSIZE=18446744073709551615
LimitDATA=18446744073709551615
LimitSTACK=18446744073709551615
LimitCORE=18446744073709551615
LimitRSS=18446744073709551615
LimitNOFILE=4096
LimitAS=18446744073709551615
LimitNPROC=63090
LimitMEMLOCK=65536
LimitLOCKS=18446744073709551615
LimitSIGPENDING=63090
LimitMSGQUEUE=819200
LimitNICE=0
LimitRTPRIO=0
LimitRTTIME=18446744073709551615
OOMScoreAdjust=0
Nice=0
IOScheduling=0
CPUSchedulingPolicy=0
CPUSchedulingPriority=0
TimerSlackNSec=50000
CPUSchedulingResetOnFork=no
NonBlocking=no
StandardInput=null
StandardOutput=journal
StandardError=inherit
TTYReset=no
TTYVHangup=no
TTYVTDisallocate=no
SyslogPriority=30
SyslogLevelPrefix=yes
SecureBits=0
CapabilityBoundingSet=18446744073709551615
AmbientCapabilities=0
MountFlags=0
PrivateTmp=no
PrivateNetwork=no
PrivateDevices=no
ProtectHome=no
ProtectSystem=no
SameProcessGroup=no
IgnoreSIGPIPE=yes
NoNewPrivileges=no
SystemCallErrorNumber=0
RuntimeDirectoryMode=0755
KillMode=control-group
KillSignal=15
SendSIGKILL=yes
SendSIGHUP=no
Id=watchdog.service
Names=watchdog.service
Requires=basic.target
Wants=system.slice
WantedBy=multi-user.target
Conflicts=shutdown.target
Before=multi-user.target shutdown.target
After=basic.target systemd-journald.socket system.slice
Description=watchdog daemon
LoadState=loaded
ActiveState=inactive
SubState=dead
FragmentPath=/usr/lib/systemd/system/watchdog.service
DropInPaths=/etc/systemd/system/watchdog.service.d/override.conf
UnitFileState=enabled
UnitFilePreset=disabled
InactiveExitTimestamp=Mon 2018-03-19 13:42:22 CET
InactiveExitTimestampMonotonic=14539954
ActiveEnterTimestamp=Mon 2018-03-19 13:42:22 CET
ActiveEnterTimestampMonotonic=15052358
ActiveExitTimestamp=Mon 2018-03-19 13:44:02 CET
ActiveExitTimestampMonotonic=114543976
InactiveEnterTimestamp=Mon 2018-03-19 13:44:07 CET
InactiveEnterTimestampMonotonic=119544801
CanStart=yes
CanStop=yes
CanReload=no
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=yes
OnFailureJobMode=replace
IgnoreOnIsolate=yes
IgnoreOnSnapshot=no
NeedDaemonReload=no
JobTimeoutUSec=0
JobTimeoutAction=none
ConditionResult=yes
AssertResult=yes
ConditionTimestamp=Mon 2018-03-19 13:42:22 CET
ConditionTimestampMonotonic=14539719
AssertTimestamp=Mon 2018-03-19 13:42:22 CET
AssertTimestampMonotonic=14539719
Transient=no
[root@strike systemd]# systemctl show watchdog.service | cat
Type=forking
Restart=no
NotifyAccess=none
RestartUSec=100ms
TimeoutStartUSec=1min 30s
TimeoutStopUSec=1min 30s
WatchdogUSec=0
WatchdogTimestampMonotonic=0
StartLimitInterval=10000000
StartLimitBurst=5
StartLimitAction=none
FailureAction=none
PermissionsStartOnly=no
RootDirectoryStartOnly=no
RemainAfterExit=no
GuessMainPID=yes
MainPID=0
ControlPID=0
FileDescriptorStoreMax=0
StatusErrno=0
Result=success
ExecMainStartTimestamp=Mon 2018-03-19 13:42:22 CET
ExecMainStartTimestampMonotonic=15052342
ExecMainExitTimestamp=Mon 2018-03-19 13:44:07 CET
ExecMainExitTimestampMonotonic=119544736
ExecMainPID=1291
ExecMainCode=1
ExecMainStatus=0
ExecStart={ path=/usr/sbin/watchdog ; argv[]=/usr/sbin/watchdog ; 
ignore_errors=no ; start_time=[Mon 2018-03-19 13:42:22 CET] ; stop_time=[Mon 
2018-03-19 13:42:22 CET] ; pid=1267 ; code=exited ; status=0 }
Slice=system.slice
MemoryCurrent=18446744073709551615
TasksCurrent=18446744073709551615
Delegate=no
CPUAccounting=no
CPUShares=18446744073709551615
StartupCPUShares=18446744073709551615
CPUQuotaPerSecUSec=infinity
BlockIOAccounting=no
BlockIOWeight=18446744073709551615
StartupBlockIOWeight=18446744073709551615
MemoryAccounting=no
MemoryLimit=18446744073709551615
DevicePolicy=auto
TasksAccounting=no
TasksMax=18446744073709551615
UMask=0022
LimitCPU=18446744073709551615
LimitFSIZE=18446744073709551615
LimitDATA=18446744073709551615
LimitSTACK=18446744073709551615
LimitCORE=18446744073709551615
LimitRSS=18446744073709551615
LimitNOFILE=4096
LimitAS=18446744073709551615
LimitNPROC=63090
LimitMEMLOCK=65536
LimitLOCKS=18446744073709551615
LimitSIGPENDING=63090
LimitMSGQUEUE=819200
LimitNICE=0
LimitRTPRIO=0
LimitRTTIME=18446744073709551615
OOMScoreAdjust=0
Nice=0
IOScheduling=0
CPUSchedulingPolicy=0
CPUSchedulingPriority=0
TimerSlackNSec=50000
CPUSchedulingResetOnFork=no
NonBlocking=no
StandardInput=null
StandardOutput=journal
StandardError=inherit
TTYReset=no
TTYVHangup=no
TTYVTDisallocate=no
SyslogPriority=30
SyslogLevelPrefix=yes
SecureBits=0
CapabilityBoundingSet=18446744073709551615
AmbientCapabilities=0
MountFlags=0
PrivateTmp=no
PrivateNetwork=no
PrivateDevices=no
ProtectHome=no
ProtectSystem=no
SameProcessGroup=no
IgnoreSIGPIPE=yes
NoNewPrivileges=no
SystemCallErrorNumber=0
RuntimeDirectoryMode=0755
KillMode=control-group
KillSignal=15
SendSIGKILL=yes
SendSIGHUP=no
Id=watchdog.service
Names=watchdog.service
Requires=basic.target
Wants=system.slice
WantedBy=multi-user.target
Conflicts=shutdown.target
Before=multi-user.target shutdown.target
After=basic.target systemd-journald.socket system.slice
Description=watchdog daemon
LoadState=loaded
ActiveState=inactive
SubState=dead
FragmentPath=/usr/lib/systemd/system/watchdog.service
DropInPaths=/etc/systemd/system/watchdog.service.d/override.conf
UnitFileState=enabled
UnitFilePreset=disabled
InactiveExitTimestamp=Mon 2018-03-19 13:42:22 CET
InactiveExitTimestampMonotonic=14539954
ActiveEnterTimestamp=Mon 2018-03-19 13:42:22 CET
ActiveEnterTimestampMonotonic=15052358
ActiveExitTimestamp=Mon 2018-03-19 13:44:02 CET
ActiveExitTimestampMonotonic=114543976
InactiveEnterTimestamp=Mon 2018-03-19 13:44:07 CET
InactiveEnterTimestampMonotonic=119544801
CanStart=yes
CanStop=yes
CanReload=no
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=yes
OnFailureJobMode=replace
IgnoreOnIsolate=yes
IgnoreOnSnapshot=no
NeedDaemonReload=no
JobTimeoutUSec=0
JobTimeoutAction=none
ConditionResult=yes
AssertResult=yes
ConditionTimestamp=Mon 2018-03-19 13:42:22 CET
ConditionTimestampMonotonic=14539719
AssertTimestamp=Mon 2018-03-19 13:42:22 CET
AssertTimestampMonotonic=14539719
Transient=no


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Re: [systemd-devel] start service in multi-user.target but don't stop it on isolate

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