NTP Failed

Hi,
my NTP service is failed with below logs in messages, can anybody please help.
ntpd[25634]: ntpd 4.2.6p5@1.2349-o Tue May 3 14:57:03 UTC 2016 (1)
ntpd[25635]: proto: precision = 0.044 usec
ntpd[25635]: 0.0.0.0 c01d 0d kern kernel time sync enabled
ntpd[25635]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
ntpd[25635]: Listen and drop on 1 v6wildcard :: UDP 123
ntpd[25635]: Listen normally on 2 lo 127.0.0.1 UDP 123
ntpd[25635]: Listen normally on 3 bond0 10.184.22.65 UDP 123
ntpd[25635]: Listen normally on 4 bond0:0 10.184.22.85 UDP 123
ntpd[25635]: Listen normally on 5 lo ::1 UDP 123
ntpd[25635]: Listen normally on 6 bond0 fe80::210:e0ff:fe22:584c UDP 123
ntpd[25635]: Listen normally on 7 ens1f0 fe80::a236:9fff:fe16:cb20 UDP 123
ntpd[25635]: Listen normally on 8 ens1f1 fe80::a236:9fff:fe16:cb21 UDP 123
ntpd[25635]: Listening on routing socket on fd #25 for interface updates
ntpd[25635]: Deferring DNS for 0.africa.pool.ntp.org 1
ntpd[25635]: Deferring DNS for 1.africa.pool.ntp.org 1
ntpd[25635]: Deferring DNS for 2.africa.pool.ntp.org 1
ntpd[25635]: Deferring DNS for 3.africa.pool.ntp.org 1
ntpd[25635]: 0.0.0.0 c016 06 restart
ntpd[25635]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM
ntpd[25635]: 0.0.0.0 c011 01 freq_not_set
ntpd[25635]: 0.0.0.0 c514 04 freq_mode
ntpd_intres[25636]: host name not found: 0.africa.pool.ntp.org
ntpd_intres[25636]: host name not found: 1.africa.pool.ntp.org
ntpd_intres[25636]: host name not found: 2.africa.pool.ntp.org
ntpd_intres[25636]: host name not found: 3.africa.pool.ntp.org
ntpd[25635]: 0.0.0.0 0617 07 panic_stop -3564 s; set clock manually within 1000 s.
systemd: ntpd.service: main process exited, code=exited, status=255/n/a
ntpd_intres[25636]: ntpd exiting on signal 15
systemd: Unit ntpd.service entered failed state.
systemd: ntpd.service failed.