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

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