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【整理】systemctl的使用心得和语法

CentOS crifan 379浏览 0评论

折腾:

【已解决】CentOS中如何用systemctl管理supervisor包括设置supervisor开机启动

搜到了:

How To Use Systemctl to Manage Systemd Services and Units | DigitalOcean

之前是已经知道了基本用法:

<code>systemctl status xxx

systemctl start xxx
systemctl stop xxx
systemctl restart xxx
systemctl reload xxx
systemctl enable xxx
systemctl disable xxx
systemctl is-enabled xxx

systemctl is-active xxx
</code>

但是更高级的,不知道,所以继续去学习学习,和systemctl有关的东西:

systemctl cat

<code>[root@xx-general-01 robotDemo]# systemctl cat supervisord
# /usr/lib/systemd/system/supervisord.service
[Unit]
Description=Process Monitoring and Control Daemon
After=rc-local.service nss-user-lookup.target

[Service]
Type=forking
ExecStart=/usr/bin/supervisord -c /etc/supervisord.conf

[Install]
WantedBy=multi-user.target
[root@xx-general-01 robotDemo]# ll /usr/lib/systemd/system/supervisord.service
-rw-r--r-- 1 root root 221 Jul 29  2017 /usr/lib/systemd/system/supervisord.service
</code>

看看list-dependencies:

<code>[root@xx-general-01 robotDemo]# systemctl list-dependencies supervisord
supervisord.service
● ├─system.slice
● └─basic.target
●   ├─microcode.service
●   ├─rhel-autorelabel-mark.service
●   ├─rhel-autorelabel.service
●   ├─rhel-configure.service
●   ├─rhel-dmesg.service
●   ├─rhel-loadmodules.service
●   ├─selinux-policy-migrate-local-changes@targeted.service
●   ├─paths.target
●   ├─slices.target
●   │ ├─-.slice
●   │ └─system.slice
●   ├─sockets.target
●   │ ├─dbus.socket
●   │ ├─systemd-initctl.socket
●   │ ├─systemd-journald.socket
●   │ ├─systemd-shutdownd.socket
●   │ ├─systemd-udevd-control.socket
●   │ └─systemd-udevd-kernel.socket
●   ├─sysinit.target
●   │ ├─dev-hugepages.mount
●   │ ├─dev-mqueue.mount
●   │ ├─kmod-static-nodes.service
●   │ ├─plymouth-read-write.service
●   │ ├─plymouth-start.service
●   │ ├─proc-sys-fs-binfmt_misc.automount
●   │ ├─sys-fs-fuse-connections.mount
●   │ ├─sys-kernel-config.mount
●   │ ├─sys-kernel-debug.mount
●   │ ├─systemd-ask-password-console.path
●   │ ├─systemd-binfmt.service
●   │ ├─systemd-firstboot.service
●   │ ├─systemd-hwdb-update.service
●   │ ├─systemd-journal-catalog-update.service
●   │ ├─systemd-journal-flush.service
●   │ ├─systemd-journald.service
●   │ ├─systemd-machine-id-commit.service
●   │ ├─systemd-modules-load.service
●   │ ├─systemd-random-seed.service
●   │ ├─systemd-sysctl.service
●   │ ├─systemd-tmpfiles-setup-dev.service
●   │ ├─systemd-tmpfiles-setup.service
●   │ ├─systemd-udev-trigger.service
●   │ ├─systemd-udevd.service
●   │ ├─systemd-update-done.service
●   │ ├─systemd-update-utmp.service
●   │ ├─systemd-vconsole-setup.service
●   │ ├─cryptsetup.target
●   │ ├─local-fs.target
●   │ │ ├─-.mount
●   │ │ ├─rhel-import-state.service
●   │ │ ├─rhel-readonly.service
●   │ │ ├─systemd-fsck-root.service
●   │ │ └─systemd-remount-fs.service
●   │ └─swap.target
●   └─timers.target
●     └─systemd-tmpfiles-clean.timer
[root@xx-general-01 robotDemo]#
</code>

再去看看show:

<code>[root@xx-general-01 robotDemo]# systemctl show supervisord
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=exit-code
ExecMainStartTimestamp=Mon 2018-05-14 16:41:52 CST
ExecMainStartTimestampMonotonic=5390982
ExecMainExitTimestamp=Thu 2018-05-24 12:00:24 CST
ExecMainExitTimestampMonotonic=847117137605
ExecMainPID=678
ExecMainCode=1
ExecMainStatus=2
ExecStart={ path=/usr/bin/supervisord ; argv[]=/usr/bin/supervisord -c /etc/supervisord.conf ; ignore_errors=no ; start_time=[Thu 2018-05-24 13:57:01 CST] ; stop_time=[Thu 2018-05-24 13:
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=63471
LimitMEMLOCK=65536
LimitLOCKS=18446744073709551615
LimitSIGPENDING=63471
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=supervisord.service
Names=supervisord.service
Requires=basic.target
Wants=system.slice
WantedBy=multi-user.target
Conflicts=shutdown.target
Before=shutdown.target multi-user.target
After=nss-user-lookup.target system.slice rc-local.service systemd-journald.socket basic.target
Description=Process Monitoring and Control Daemon
LoadState=loaded
ActiveState=failed
SubState=failed
FragmentPath=/usr/lib/systemd/system/supervisord.service
UnitFileState=enabled
UnitFilePreset=disabled
InactiveExitTimestamp=Thu 2018-05-24 13:57:01 CST
InactiveExitTimestampMonotonic=854114362107
ActiveEnterTimestamp=Mon 2018-05-14 16:41:52 CST
ActiveEnterTimestampMonotonic=5391055
ActiveExitTimestamp=Thu 2018-05-24 12:00:24 CST
ActiveExitTimestampMonotonic=847117138092
InactiveEnterTimestamp=Thu 2018-05-24 13:57:02 CST
InactiveEnterTimestampMonotonic=854114560838
CanStart=yes
CanStop=yes
CanReload=no
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=yes
OnFailureJobMode=replace
IgnoreOnIsolate=no
IgnoreOnSnapshot=no
NeedDaemonReload=no
JobTimeoutUSec=0
JobTimeoutAction=none
ConditionResult=yes
AssertResult=yes
ConditionTimestamp=Thu 2018-05-24 13:57:01 CST
ConditionTimestampMonotonic=854114361339
AssertTimestamp=Thu 2018-05-24 13:57:01 CST
AssertTimestampMonotonic=854114361340
Transient=no
</code>

有机会,去试试:

  • mask

  • unmask

和systemctl相关的:

  • systemctl

    • daemons进程:systemd

    • 管理系统的进程和服务

  • journalctl

    • daemons进程:journald

    • 管理日志log management

  • loginctl

    • daemons进程:logind

    • 管理用户会话user sessions

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