Below is quick tips to setup NTP server and sync the whole hadoop cluster.
1. Configure hdm as the NTP server.
vi /etc/ntp.conf:
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
2. Configure others as NTP clients
vi /etc/ntp.conf:
server hdm.xxx.com
3. Start ntpd on all servers.
service ntpd start
4. Enable ntpd on all servers.
chkconfig ntpd on
5. Make sure NTP server has sycned with itself
ntpq -p
6. Check NTP clients
ntpdate -q hdm
7. Troubleshooting on NTP client
ntpdate -d hdm
8. Sample&Minimum /etc/ntp.conf
On server side:
driftfile /var/lib/ntp/drift
restrict 192.111.111.0 mask 255.255.255.0 nomodify notrap
restrict 127.0.0.1
restrict -6 ::1
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
keys /etc/ntp/keys
On client side:
driftfile /var/lib/ntp/drift
server hdm.xxx.com prefer true iburst
keys /etc/ntp/keys
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