centos7不同于以往linux的操作，對于開機自啟動的調整，命令有所不同。? ? chkconfig --list查看非系統內置服務的自啟動狀態

[iyunv@vd13crmtb01 ~]# chkconfig --list

Note: This output shows SysV services only and does not include native

systemd services. SysV configuration data might be overridden by native

systemd configuration.

If you want to list systemd services use 'systemctl list-unit-files'.

To see services enabled on particular target use

'systemctl list-dependencies [target]'.

iprdump? ?? ?? ?0:off? ?1:off? ?2:on? ? 3:on? ? 4:on? ? 5:on? ? 6:off

iprinit? ?? ?? ?0:off? ?1:off? ?2:on? ? 3:on? ? 4:on? ? 5:on? ? 6:off

iprupdate? ?? ? 0:off? ?1:off? ?2:on? ? 3:on? ? 4:on? ? 5:on? ? 6:off

netconsole? ?? ?0:off? ?1:off? ?2:off? ?3:off? ?4:off? ?5:off? ?6:off

network? ?? ?? ?0:off? ?1:off? ?2:on? ? 3:on? ? 4:on? ? 5:on? ? 6:off

vmware-tools? ? 0:off? ?1:off? ?2:on? ? 3:on? ? 4:on? ? 5:on? ? 6:off

根據提示，要查看系統內置的服務自啟動狀態需要使用命令systemctl list-unit-files，它會列出系統所有內置服務的自啟動狀態。

所以調整ntp的自啟動需要在這里調整。

[iyunv@vd13crmtb01 ~]# systemctl enable ntpd.service? ?? ?? ?//開機自啟動

調整之后重啟系統，可是發現ntp并沒有啟動起來

[iyunv@vd13crmtb01 ~]# pgrep ntpd? ?? ?? ?? ?? ?? ?? ?? ?? ? //無法查看到相關進程

[iyunv@vd13crmtb01 ~]# systemctl status ntpd

ntpd.service - Network Time Service

Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled)

Active: inactive (dead)? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ? //顯示開機自啟動了，但是狀態是inactive

通過查詢發現有一個chronyd服務設置為開機自啟動，這個服務導致ntp無法開啟自啟動

[iyunv@vd13crmtb01 ~]# systemctl status chronyd

chronyd.service - NTP client/server

Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)

Active: inactive (dead) since Tue 2014-11-11 08:28:14 CST; 1min 45s ago

Main PID: 3033 (code=exited, status=0/SUCCESS)

CGroup: /system.slice/chronyd.service

Nov 11 08:06:31 vd13crmtb01.zj.chinamobile.com systemd[1]: Starting NTP clien...

Nov 11 08:06:31 vd13crmtb01.zj.chinamobile.com chronyd[3033]: chronyd version...

Nov 11 08:06:31 vd13crmtb01.zj.chinamobile.com chronyd[3033]: Linux kernel ma...

Nov 11 08:06:31 vd13crmtb01.zj.chinamobile.com chronyd[3033]: hz=100 shift_hz...

Nov 11 08:06:31 vd13crmtb01.zj.chinamobile.com systemd[1]: Started NTP client...

Nov 11 08:28:14 vd13crmtb01.zj.chinamobile.com systemd[1]: Stopping NTP clien...

Nov 11 08:28:14 vd13crmtb01.zj.chinamobile.com systemd[1]: Stopped NTP client...

Hint: Some lines were ellipsized, use -l to show in full.

通過禁止chronyd服務開機自啟動之后再將系統重啟

[iyunv@vd13crmtb01 ~]# systemctl disable chronyd.service

rm '/etc/systemd/system/multi-user.target.wants/chronyd.service'

[iyunv@vd13crmtb01 ~]# pgrep ntpd

2981

[iyunv@vd13crmtb01 ~]# ntpq -p

remote? ?? ?? ???refid? ?? ?st t when poll reach? ?delay? ?offset??jitter

==============================================================================

10.70.213.132? ?10.70.91.148? ???3 u? ?21? ?64? ? 1? ? 1.252? ? 0.029? ?0.000

*10.70.213.133? ?10.70.91.148? ???3 u? ?21? ?64? ? 1? ? 1.139? ?-0.191? ?0.000

此時，NTP的服務已經開機自啟動了，完成！

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