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systemctl 命令完全指南（三）
2016-12-17 18:23:20
14884
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?、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 -TheApache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled)
Active: active (running) since Tue2015-04-2817:21:30 IST;6s ago
Process:2876ExecStop=/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
Apr2817:21:30 tecmint systemd[1]:StartingTheApache HTTP Server...
Apr2817:21:30 tecmint httpd[2881]: AH00558: httpd:Couldnot 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?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 -TheApache HTTP Server Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled) Active: failed (Result:exit-code) since Tue2015-04-2818:01:42 IST;28min ago Main PID:2881(code=exited, status=0/SUCCESS) Status:"Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec" Apr2817:37:29 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2817:37:29 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2817:37:39 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2817:37:39 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2817:37:49 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2817:37:49 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2817:37:59 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2817:37:59 tecmint systemd[1]: httpd.service:Got notification message from PID 2881, but recepti...bled. Apr2818:01:42 tecmint systemd[1]: httpd.service: control process exited, code=exited status=226 Apr2818:01:42 tecmint systemd[1]:Unit httpd.service entered failed state. Hint:Some lines were ellipsized,use-l to show in full.
