linux systemctl 命令完全指南-mile米乐体育
linux
2020年03月29日 23:39
1
systemctl是一个systemd工具，主要负责控制systemd系统和服务管理器。
systemd是一个系统管理守护进程、工具和库的集合，用于取代system v初始进程。systemd的功能是用于集中管理和配置类unix系统。
在linux生态系统中，systemd被部署到了大多数的标准linux发行版中，只有为数不多的几个发行版尚未部署。systemd通常是所有其它守护进程的父进程，但并非总是如此。
使用systemctl管理linux服务
本文旨在阐明在运行systemd的系统上“如何控制系统和服务”。
systemd初体验和systemctl基础
1. 首先检查你的系统中是否安装有systemd并确定当前安装的版本
# systemd --version systemd 215 pam audit selinux ima sysvinit libcryptsetup gcrypt acl xz -seccomp -apparmor
上例中很清楚地表明，我们安装了215版本的systemd。
2. 检查systemd和systemctl的二进制文件和库文件的安装位置
# whereis systemd systemd: /usr/lib/systemd /etc/systemd /usr/share/systemd /usr/share/man/man1/systemd.1.gz # whereis systemctl systemctl: /usr/bin/systemctl /usr/share/man/man1/systemctl.1.gz
3. 检查systemd是否运行
# ps -eaf | grep [s]ystemd root 1 0 0 16:27 ? 00:00:00 /usr/lib/systemd/systemd --switched-root --system --deserialize 23 root 444 1 0 16:27 ? 00:00:00 /usr/lib/systemd/systemd-journald root 469 1 0 16:27 ? 00:00:00 /usr/lib/systemd/systemd-udevd root 555 1 0 16:27 ? 00:00:00 /usr/lib/systemd/systemd-logind dbus 556 1 0 16:27 ? 00:00:00 /bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
注意：systemd是作为父进程（pid=1）运行的。在上面带（-e）参数的ps命令输出中，选择所有进程，（-a）选择除会话前导外的所有进程，并使用（-f）参数输出完整格式列表（即 -eaf）。
也请注意上例中后随的方括号和例子中剩余部分。方括号表达式是grep的字符类表达式的一部分。
4. 分析systemd启动进程
# systemd-analyze startup finished in 487ms (kernel) 2.776s (initrd) 20.229s (userspace) = 23.493s
5. 分析启动时各个进程花费的时间
# systemd-analyze blame 8.565s mariadb.service 7.991s webmin.service 6.095s postfix.service 4.311s httpd.service 3.926s firewalld.service 3.780s kdump.service 3.238s tuned.service 1.712s network.service 1.394s lvm2-monitor.service 1.126s systemd-logind.service ....
6. 分析启动时的关键链
# systemd-analyze critical-chain the time after the unit is active or started is printed after the "@" character. the time the unit takes to start is printed after the " " character. multi-user.target @20.222s └─mariadb.service @11.657s 8.565s └─network.target @11.168s └─network.service @9.456s 1.712s └─networkmanager.service @8.858s 596ms └─firewalld.service @4.931s 3.926s └─basic.target @4.916s └─sockets.target @4.916s └─dbus.socket @4.916s └─sysinit.target @4.905s └─systemd-update-utmp.service @4.864s 39ms └─auditd.service @4.563s 301ms └─systemd-tmpfiles-setup.service @4.485s 69ms └─rhel-import-state.service @4.342s 142ms └─local-fs.target @4.324s └─boot.mount @4.286s 31ms └─systemd-fsck@dev-disk-by/x2duuid-79f594ad/x2da332/x2d4730/x2dbb5f/x2d85d19608096 └─dev-disk-by/x2duuid-79f594ad/x2da332/x2d4730/x2dbb5f/x2d85d196080964.device @4
重要：systemctl接受服务（.service），挂载点（.mount），套接口（.socket）和设备（.device）作为单元。
7. 列出所有可用单元
# systemctl list-unit-files unit file state proc-sys-fs-binfmt_misc.automount static dev-hugepages.mount static dev-mqueue.mount static proc-sys-fs-binfmt_misc.mount static sys-fs-fuse-connections.mount static sys-kernel-config.mount static sys-kernel-debug.mount static tmp.mount disabled brandbot.path disabled .....
8. 列出所有运行中单元
# systemctl list-units unit load active sub description proc-sys-fs-binfmt_misc.automount loaded active waiting arbitrary executable file formats file syste sys-devices-pc...0-1:0:0:0-block-sr0.device loaded active plugged vbox_cd-rom sys-devices-pc...:00:03.0-net-enp0s3.device loaded active plugged pro/1000 mt desktop adapter sys-devices-pc...00:05.0-sound-card0.device loaded active plugged 82801aa ac'97 audio controller sys-devices-pc...:0:0-block-sda-sda1.device loaded active plugged vbox_harddisk sys-devices-pc...:0:0-block-sda-sda2.device loaded active plugged lvm pv qzyo3l-qyal-urua-cjuk-pljo-qktx-vgbq8 sys-devices-pc...0-2:0:0:0-block-sda.device loaded active plugged vbox_harddisk sys-devices-pl...erial8250-tty-ttys0.device loaded active plugged /sys/devices/platform/serial8250/tty/ttys0 sys-devices-pl...erial8250-tty-ttys1.device loaded active plugged /sys/devices/platform/serial8250/tty/ttys1 sys-devices-pl...erial8250-tty-ttys2.device loaded active plugged /sys/devices/platform/serial8250/tty/ttys2 sys-devices-pl...erial8250-tty-ttys3.device loaded active plugged /sys/devices/platform/serial8250/tty/ttys3 sys-devices-virtual-block-dm/x2d0.device loaded active plugged /sys/devices/virtual/block/dm-0 sys-devices-virtual-block-dm/x2d1.device loaded active plugged /sys/devices/virtual/block/dm-1 sys-module-configfs.device loaded active plugged /sys/module/configfs ...
9. 列出所有失败单元
# systemctl --failed unit load active sub description kdump.service loaded failed failed crash recovery kernel arming load = reflects whether the unit definition was properly loaded. active = the high-level unit activation state, i.e. generalization of sub. sub = the low-level unit activation state, values depend on unit type. 1 loaded units listed. pass --all to see loaded but inactive units, too. to show all installed unit files use 'systemctl list-unit-files'.
10. 检查某个单元（如 cron.service）是否启用
# systemctl is-enabled crond.service enabled
11. 检查某个单元或服务是否运行
# systemctl status firewalld.service firewalld.service - firewalld - dynamic firewall daemon loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled) active: active (running) since tue 2015-04-28 16:27:55 ist; 34min ago main pid: 549 (firewalld) cgroup: /system.slice/firewalld.service └─549 /usr/bin/python -es /usr/sbin/firewalld --nofork --nopid apr 28 16:27:51 tecmint systemd[1]: starting firewalld - dynamic firewall daemon... apr 28 16:27:55 tecmint systemd[1]: started firewalld - dynamic firewall daemon.
使用systemctl控制并管理服务
12. 列出所有服务（包括启用的和禁用的）
# systemctl list-unit-files --type=service unit file state arp-ethers.service disabled auditd.service enabled autovt@.service disabled blk-availability.service disabled brandbot.service static collectd.service disabled console-getty.service disabled console-shell.service disabled cpupower.service disabled crond.service enabled dbus-org.fedoraproject.firewalld1.service enabled ....
13. linux中如何启动、重启、停止、重载服务以及检查服务（如 httpd.service）状态
# systemctl start httpd.service # systemctl restart httpd.service # systemctl stop httpd.service # systemctl reload httpd.service # systemctl status httpd.service httpd.service - the apache http server loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled) active: active (running) since tue 2015-04-28 17:21:30 ist; 6s ago process: 2876 execstop=/bin/kill -winch ${mainpid} (code=exited, status=0/success) main pid: 2881 (httpd) status: "processing requests..." cgroup: /system.slice/httpd.service ├─2881 /usr/sbin/httpd -dforeground ├─2884 /usr/sbin/httpd -dforeground ├─2885 /usr/sbin/httpd -dforeground ├─2886 /usr/sbin/httpd -dforeground ├─2887 /usr/sbin/httpd -dforeground └─2888 /usr/sbin/httpd -dforeground apr 28 17:21:30 tecmint systemd[1]: starting the apache http server... apr 28 17:21:30 tecmint httpd[2881]: ah00558: httpd: could not reliably determine the server's fully q...ssage apr 28 17:21:30 tecmint systemd[1]: started the apache http server. hint: some lines were ellipsized, use -l to show in full. 注意：当我们使用systemctl的start，restart，stop和reload命令时，我们不会从终端获取到任何输出内容，只有status命令可以打印输出。
14. 如何激活服务并在启动时启用或禁用服务（即系统启动时自动启动服务）
# systemctl is-active httpd.service # systemctl enable httpd.service # systemctl disable httpd.service
15. 如何屏蔽（让它不能启动）或显示服务（如 httpd.service）
# systemctl mask httpd.service ln -s '/dev/null' '/etc/systemd/system/httpd.service' # systemctl unmask httpd.service rm '/etc/systemd/system/httpd.service'
16. 使用systemctl命令杀死服务
# systemctl kill httpd # systemctl status httpd httpd.service - the apache http server loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled) active: failed (result: exit-code) since tue 2015-04-28 18:01:42 ist; 28min ago main pid: 2881 (code=exited, status=0/success) status: "total requests: 0; current requests/sec: 0; current traffic: 0 b/sec" apr 28 17:37:29 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 17:37:29 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 17:37:39 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 17:37:39 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 17:37:49 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 17:37:49 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 17:37:59 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 17:37:59 tecmint systemd[1]: httpd.service: got notification message from pid 2881, but recepti...bled. apr 28 18:01:42 tecmint systemd[1]: httpd.service: control process exited, code=exited status=226 apr 28 18:01:42 tecmint systemd[1]: unit httpd.service entered failed state. hint: some lines were ellipsized, use -l to show in full.
使用systemctl控制并管理挂载点
17. 列出所有系统挂载点
# systemctl list-unit-files --type=mount unit file state dev-hugepages.mount static dev-mqueue.mount static proc-sys-fs-binfmt_misc.mount static sys-fs-fuse-connections.mount static sys-kernel-config.mount static sys-kernel-debug.mount static tmp.mount disabled
18. 挂载、卸载、重新挂载、重载系统挂载点并检查系统中挂载点状态
# systemctl start tmp.mount # systemctl stop tmp.mount # systemctl restart tmp.mount # systemctl reload tmp.mount # systemctl status tmp.mount tmp.mount - temporary directory loaded: loaded (/usr/lib/systemd/system/tmp.mount; disabled) active: active (mounted) since tue 2015-04-28 17:46:06 ist; 2min 48s ago where: /tmp what: tmpfs docs: man:hier(7) http://www.freedesktop.org/wiki/software/systemd/apifilesystems process: 3908 execmount=/bin/mount tmpfs /tmp -t tmpfs -o mode=1777,strictatime (code=exited, status=0/success) apr 28 17:46:06 tecmint systemd[1]: mounting temporary directory... apr 28 17:46:06 tecmint systemd[1]: tmp.mount: directory /tmp to mount over is not empty, mounting anyway. apr 28 17:46:06 tecmint systemd[1]: mounted temporary directory.
19. 在启动时激活、启用或禁用挂载点（系统启动时自动挂载）
# systemctl is-active tmp.mount # systemctl enable tmp.mount # systemctl disable tmp.mount
20. 在linux中屏蔽（让它不能启用）或可见挂载点
# systemctl mask tmp.mount ln -s '/dev/null' '/etc/systemd/system/tmp.mount' # systemctl unmask tmp.mount rm '/etc/systemd/system/tmp.mount'
使用systemctl控制并管理套接口
21. 列出所有可用系统套接口
# systemctl list-unit-files --type=socket unit file state dbus.socket static dm-event.socket enabled lvm2-lvmetad.socket enabled rsyncd.socket disabled sshd.socket disabled syslog.socket static systemd-initctl.socket static systemd-journald.socket static systemd-shutdownd.socket static systemd-udevd-control.socket static systemd-udevd-kernel.socket static 11 unit files listed.
22. 在linux中启动、重启、停止、重载套接口并检查其状态
# systemctl start cups.socket # systemctl restart cups.socket # systemctl stop cups.socket # systemctl reload cups.socket # systemctl status cups.socket cups.socket - cups printing service sockets loaded: loaded (/usr/lib/systemd/system/cups.socket; enabled) active: active (listening) since tue 2015-04-28 18:10:59 ist; 8s ago listen: /var/run/cups/cups.sock (stream) apr 28 18:10:59 tecmint systemd[1]: starting cups printing service sockets. apr 28 18:10:59 tecmint systemd[1]: listening on cups printing service sockets.
23. 在启动时激活套接口，并启用或禁用它（系统启动时自启动）
# systemctl is-active cups.socket # systemctl enable cups.socket # systemctl disable cups.socket
24. 屏蔽（使它不能启动）或显示套接口
# systemctl mask cups.socket ln -s '/dev/null' '/etc/systemd/system/cups.socket' # systemctl unmask cups.socket rm '/etc/systemd/system/cups.socket'
服务的cpu利用率（分配额）
25. 获取当前某个服务的cpu分配额（如httpd）
# systemctl show -p cpushares httpd.service cpushares=1024
注意：各个服务的默认cpu分配份额=1024，你可以增加/减少某个进程的cpu分配份额。
26. 将某个服务（httpd.service）的cpu分配份额限制为2000 cpushares/
# systemctl set-property httpd.service cpushares=2000 # systemctl show -p cpushares httpd.service cpushares=2000
注意：当你为某个服务设置cpushares，会自动创建一个以服务名命名的目录（如 httpd.service），里面包含了一个名为90-cpushares.conf的文件，该文件含有cpushare限制信息，你可以通过以下方式查看该文件：
# vi /etc/systemd/system/httpd.service.d/90-cpushares.conf [service] cpushares=2000
27. 检查某个服务的所有配置细节
# systemctl show httpd id=httpd.service names=httpd.service requires=basic.target wants=system.slice wantedby=multi-user.target conflicts=shutdown.target before=shutdown.target multi-user.target after=network.target remote-fs.target nss-lookup.target systemd-journald.socket basic.target system.slice description=the apache http server loadstate=loaded activestate=active substate=running fragmentpath=/usr/lib/systemd/system/httpd.service ....
28. 分析某个服务（httpd）的关键链
# systemd-analyze critical-chain httpd.service the time after the unit is active or started is printed after the "@" character. the time the unit takes to start is printed after the " " character. httpd.service 142ms └─network.target @11.168s └─network.service @9.456s 1.712s └─networkmanager.service @8.858s 596ms └─firewalld.service @4.931s 3.926s └─basic.target @4.916s └─sockets.target @4.916s └─dbus.socket @4.916s └─sysinit.target @4.905s └─systemd-update-utmp.service @4.864s 39ms └─auditd.service @4.563s 301ms └─systemd-tmpfiles-setup.service @4.485s 69ms └─rhel-import-state.service @4.342s 142ms └─local-fs.target @4.324s └─boot.mount @4.286s 31ms └─systemd-fsck@dev-disk-by/x2duuid-79f594ad/x2da332/x2d4730/x2dbb5f/x2d85d196080964.service @4.092s 149ms └─dev-disk-by/x2duuid-79f594ad/x2da332/x2d4730/x2dbb5f/x2d85d196080964.device @4.092s
29. 获取某个服务（httpd）的依赖性列表
# systemctl list-dependencies httpd.service httpd.service ├─system.slice └─basic.target ├─firewalld.service ├─microcode.service ├─rhel-autorelabel-mark.service ├─rhel-autorelabel.service ├─rhel-configure.service ├─rhel-dmesg.service ├─rhel-loadmodules.service ├─paths.target ├─slices.target │ ├─-.slice │ └─system.slice ├─sockets.target │ ├─dbus.socket ....
30. 按等级列出控制组
# systemd-cgls ├─1 /usr/lib/systemd/systemd --switched-root --system --deserialize 23 ├─user.slice │ └─user-0.slice │ └─session-1.scope │ ├─2498 sshd: root@pts/0 │ ├─2500 -bash │ ├─4521 systemd-cgls │ └─4522 systemd-cgls └─system.slice ├─httpd.service │ ├─4440 /usr/sbin/httpd -dforeground │ ├─4442 /usr/sbin/httpd -dforeground │ ├─4443 /usr/sbin/httpd -dforeground │ ├─4444 /usr/sbin/httpd -dforeground │ ├─4445 /usr/sbin/httpd -dforeground │ └─4446 /usr/sbin/httpd -dforeground ├─polkit.service │ └─721 /usr/lib/polkit-1/polkitd --no-debug ....
31. 按cpu、内存、输入和输出列出控制组
# systemd-cgtop path tasks %cpu memory input/s output/s / 83 1.0 437.8m - - /system.slice - 0.1 - - - /system.slice/mariadb.service 2 0.1 - - - /system.slice/tuned.service 1 0.0 - - - /system.slice/httpd.service 6 0.0 - - - /system.slice/networkmanager.service 1 - - - - /system.slice/atop.service 1 - - - - /system.slice/atopacct.service 1 - - - - /system.slice/auditd.service 1 - - - - /system.slice/crond.service 1 - - - - /system.slice/dbus.service 1 - - - - /system.slice/firewalld.service 1 - - - - /system.slice/lvm2-lvmetad.service 1 - - - - /system.slice/polkit.service 1 - - - - /system.slice/postfix.service 3 - - - - /system.slice/rsyslog.service 1 - - - - /system.slice/system-getty.slice/getty@tty1.service 1 - - - - /system.slice/systemd-journald.service 1 - - - - /system.slice/systemd-logind.service 1 - - - - /system.slice/systemd-udevd.service 1 - - - - /system.slice/webmin.service 1 - - - - /user.slice/user-0.slice/session-1.scope 3 - - - -
控制系统运行等级
32. 启动系统救援模式
# systemctl rescue broadcast message from root@tecmint on pts/0 (wed 2015-04-29 11:31:18 ist): the system is going down to rescue mode now!
33. 进入紧急模式
# systemctl emergency welcome to emergency mode! after logging in, type "journalctl -xb" to view system logs, "systemctl reboot" to reboot, "systemctl default" to try again to boot into default mode.
34. 列出当前使用的运行等级
# systemctl get-default multi-user.target
35. 启动运行等级5，即图形模式
# systemctl isolate runlevel5.target 或 # systemctl isolate graphical.target
36. 启动运行等级3，即多用户模式（命令行）
# systemctl isolate runlevel3.target 或 # systemctl isolate multiuser.target
36. 设置多用户模式或图形模式为默认运行等级
# systemctl set-default runlevel3.target # systemctl set-default runlevel5.target
37. 重启、停止、挂起、休眠系统或使系统进入混合睡眠
# systemctl reboot # systemctl halt # systemctl suspend # systemctl hibernate # systemctl hybrid-sleep
对于不知运行等级为何物的人，说明如下。
- runlevel 0 : 关闭系统
- runlevel 1 : 救援？维护模式
- runlevel 3 : 多用户，无图形系统
- runlevel 4 : 多用户，无图形系统
- runlevel 5 : 多用户，图形化系统
- runlevel 6 : 关闭并重启机器
到此为止吧。保持连线，进行评论。别忘了在下面的评论中为我们提供一些有价值的反馈哦。喜欢我们、与我们分享，求扩散。
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