Linux systemctl常用的命令有哪些

这篇文章主要介绍了Linux systemctl常用的命令有哪些的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇Linux systemctl常用的命令有哪些文章都会有所收获，下面我们一起来看看吧。

systemd是Linux系统最新的初始化系统(init),作用是提高系统的启动速度，尽可能启动较少的进程，尽可能更多进程并发启动。

systemctl 常用 命令

Systemd的版本

 systemd --version

systemd和systemctl的二进制文件和库的安装位置

 # 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

列出所有可用的单位

 # 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  .....

列出所有运行单元

 # 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  ...

检查单元是否启用?

 [root@10 ~]# systemctl is-enabled kubelet  enabled

检查单元或服务是否正在运行？

 [root@10 ~]# systemctl status kubelet -l  ● kubelet.service - kubelet: The Kubernetes Node Agent     Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)    Drop-In: /etc/systemd/system/kubelet.service.d             └─10-kubeadm.conf     Active: active (running) since Sat 2019-11-16 02:33:56 CST; 1 weeks 1 days ago       Docs: https://kubernetes.io/docs/   Main PID: 566971 (kubelet)     Memory: 90.4M     CGroup: /system.slice/kubelet.service             └─566971 /usr/bin/kubelet   --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf   --kubeconfig=/etc/kubernetes/kubelet.conf   --config=/var/lib/kubelet/config.yaml   --cgroup-driver=cgroupfs   --network-plugin=cni   --pod-infra-container-image=10.10.101.175/k8s-deploy/pause:3.1   --system-reserved=memory=782Mi   --system-reserved-cgroup=/system.slice

如何在Linux中启动，重新启动，停止，重新加载和检查服务（httpd.service）的状态

 # systemctl start httpd.service  # systemctl restart httpd.service  # systemctl stop httpd.service  # systemctl reload httpd.service  # systemctl status httpd.service

如何在引导时激活服务并启用或禁用服务（系统引导时自动启动服务）

 # systemctl is-active httpd.service  # systemctl enable httpd.service  # systemctl disable httpd.service

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