简介
systemctl是一个systemd工具，负责控制systemd系统和服务管理。
工具的使用
systemd作为父守护进程运行（PID = 1）
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| # 查看systemd进程信息
ps -eaf | grep systemd
# 重启系统
systemctl reboot
# 关闭系统，切断电源
systemctl poweroff
# cpu停止工作
systemctl halt
# 暂停系统
systemctl suspend
# 查看系统启动耗时
systemd-analyze
#-------
# output is :
#Startup finished in 2.900s (kernel) + 12.773s (userspace) = 15.674s
#graphical.target reached after 12.761s in userspace
#-------
# 查看每个服务的启动耗时
systemd-analyze blame
#-------
# output is :
# 20.138s healthd2.service
# 7.812s casaos-local-storage.service
# 3.908s casaos-app-management.service
# 3.005s networking.service
# 1.251s user@1000.service
# 1.217s user@0.service
# 1.213s user@2000.service
# 1.105s casaos-user-service.service
# 1.095s nfs-server.service
# 984ms casaos-message-bus.service
# 791ms casaos-gateway.service
# 775ms ifupdown-pre.service
# 738ms casaos.service
# 614ms apt-daily-upgrade.service
# 565ms apt-daily.service
# 493ms cloud-init-local.service
# 423ms docker.service
# .....
#-------
# 查看启动的关键链接
systemd-analyze critical-chain
#------
#output is :
#graphical.target @12.761s
#└─multi-user.target @12.760s
# └─exim4.service @6.250s +350ms
# └─network-online.target @6.243s
# └─network.target @3.927s
# └─ifupdown-pre.service @463ms +775ms
# └─systemd-udev-trigger.service @370ms +89ms
# └─systemd-udevd-kernel.socket @368ms
# └─system.slice @332ms
# └─-.slice @332ms
#-------
|
参考资料