Centos7禁止或者允许开机启动服务

[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