[root@bogon rsyslog.d]# systemctl is-enabled httpddisabled[root@bogon rsyslog.d]# systemctl status httpd● httpd.service - The Apache HTTP Server Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled) Active: inactive (dead) Docs: man:httpd(8) man:apachectl(8)Jun 26 04:51:42 bogon systemd[1]: httpd.service failed.Jun 26 04:53:28 bogon systemd[1]: Starting The Apache HTTP Server...Jun 26 04:53:29 bogon httpd[9652]: AH00558: httpd: Could not reliably determine the...ageJun 26 04:53:29 bogon systemd[1]: Started The Apache HTTP Server.Jun 26 05:38:31 bogon systemd[1]: Stopping The Apache HTTP Server...Jun 26 05:38:32 bogon systemd[1]: Starting The Apache HTTP Server...Jun 26 05:38:33 bogon httpd[12171]: AH00558: httpd: Could not reliably determine th...ageJun 26 05:38:33 bogon systemd[1]: Started The Apache HTTP Server.Jun 26 06:20:03 bogon systemd[1]: Stopping The Apache HTTP Server...Jun 26 06:20:04 bogon systemd[1]: Stopped The Apache HTTP Server.Hint: Some lines were ellipsized, use -l to show in full.[root@bogon rsyslog.d]# systemctl start httpd #开启自启动[root@bogon rsyslog.d]# systemctl status httpd #查看服务当前状态● httpd.service - The Apache HTTP Server Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled) Active: active (running) since Mon 2017-06-26 07:56:27 PDT; 4s ago Docs: man:httpd(8) man:apachectl(8) Main PID: 15508 (httpd) Status: "Processing requests..." CGroup: /system.slice/httpd.service ├─15508 /usr/sbin/httpd -DFOREGROUND ├─15509 /usr/sbin/httpd -DFOREGROUND ├─15510 /usr/sbin/httpd -DFOREGROUND ├─15511 /usr/sbin/httpd -DFOREGROUND ├─15512 /usr/sbin/httpd -DFOREGROUND └─15513 /usr/sbin/httpd -DFOREGROUNDJun 26 07:56:25 bogon systemd[1]: Starting The Apache HTTP Server...Jun 26 07:56:26 bogon httpd[15508]: AH00558: httpd: Could not reliably determine th...ageJun 26 07:56:27 bogon systemd[1]: Started The Apache HTTP Server.Hint: Some lines were ellipsized, use -l to show in full.[root@bogon rsyslog.d]# systemctl stop httpd #禁止自启动[root@bogon rsyslog.d]# systemctl status httpd● httpd.service - The Apache HTTP Server Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled) Active: inactive (dead) Docs: man:httpd(8) man:apachectl(8)Jun 26 05:38:32 bogon systemd[1]: Starting The Apache HTTP Server...Jun 26 05:38:33 bogon httpd[12171]: AH00558: httpd: Could not reliably determine th...ageJun 26 05:38:33 bogon systemd[1]: Started The Apache HTTP Server.Jun 26 06:20:03 bogon systemd[1]: Stopping The Apache HTTP Server...Jun 26 06:20:04 bogon systemd[1]: Stopped The Apache HTTP Server.Jun 26 07:56:25 bogon systemd[1]: Starting The Apache HTTP Server...Jun 26 07:56:26 bogon httpd[15508]: AH00558: httpd: Could not reliably determine th...ageJun 26 07:56:27 bogon systemd[1]: Started The Apache HTTP Server.Jun 26 07:56:35 bogon systemd[1]: Stopping The Apache HTTP Server...Jun 26 07:56:36 bogon systemd[1]: Stopped The Apache HTTP Server.Hint: Some lines were ellipsized, use -l to show in full.[root@bogon rsyslog.d]# systemctl start httpd[root@bogon rsyslog.d]# systemctl restart httpd[root@bogon rsyslog.d]# systemctl enable httpdCreated symlink from /etc/systemd/system/multi-user.target.wants/httpd.service to /usr/lib/systemd/system/httpd.service.[root@bogon rsyslog.d]# systemctl is-enabled httpd #查询是否自启动enabled[root@bogon rsyslog.d]# systemctl disable httpd #禁止自启动Removed symlink /etc/systemd/system/multi-user.target.wants/httpd.service.[root@bogon rsyslog.d]# systemctl is-enabled httpddisabled[root@bogon rsyslog.d]# systemctl list-unit-files|grep enabled #查看自启动服务列表abrt-ccpp.service enabled abrt-oops.service enabled abrt-vmcore.service enabled abrt-xorg.service enabled abrtd.service enabled accounts-daemon.service enabled atd.service enabled auditd.service enabled autovt@.service enabled avahi-daemon.service enabled chronyd.service enabled crond.service enabled dbus-org.fedoraproject.FirewallD1.service enabled dbus-org.freedesktop.Avahi.service enabled dbus-org.freedesktop.ModemManager1.service enabled dbus-org.freedesktop.NetworkManager.service enabled dbus-org.freedesktop.nm-dispatcher.service enabled display-manager.service enabled dmraid-activation.service enabled firewalld.service enabled gdm.service enabled getty@.service enabled irqbalance.service enabled iscsi.service enabled kdump.service enabled ksm.service enabled ksmtuned.service enabled libstoragemgmt.service enabled libvirtd.service enabled lvm2-monitor.service enabled mdmonitor.service enabled microcode.service enabled ModemManager.service enabled multipathd.service enabled NetworkManager-dispatcher.service enabled NetworkManager.service enabled postfix.service enabled qemu-guest-agent.service enabled rngd.service enabled rsyslog.service enabled rtkit-daemon.service enabled smartd.service enabled spice-vdagentd.service enabled sshd.service enabled sysstat.service enabled systemd-readahead-collect.service enabled systemd-readahead-drop.service enabled systemd-readahead-replay.service enabled tuned.service enabled vmtoolsd.service enabled xinetd.service enabled avahi-daemon.socket enabled dm-event.socket enabled iscsid.socket enabled iscsiuio.socket enabled lvm2-lvmetad.socket enabled lvm2-lvmpolld.socket enabled rpcbind.socket enabled virtlockd.socket enabled virtlogd.socket enabled default.target enabled graphical.target enabled nfs-client.target enabled remote-fs.target enabled runlevel5.target enabled [root@bogon rsyslog.d]#
还有基于运行级别上的设置，例如在图形模式下启动httpd，但是在命令行模式下禁止自启httpd等。以后会补充进来