[root@bogon rsyslog.d]# systemctl is-enabled httpd
disabled
[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...age
Jun 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...age
Jun 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 -DFOREGROUND
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...age
Jun 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...age
Jun 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...age
Jun 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 httpd
Created 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 httpd
disabled
[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