Linux Time synchronization NTP

Pre-configuration: Turn off the firewall, configure the HOSTS,SSH password-free login

1. Select the standard for synchronization, I am using hadoop002 (set to the current time) as the synchronization standard, hadoop003 (Time is March 2018 21, set with Date-s) and hadoop004 (March 2018 21) with which to keep in sync

See if NTP is installed on the hadoop002

Rpm-qa|grep NTP, if there is no display content stating that NTP is not installed, perform the Yum install ntp-y installation

Next Modify/etc/ntp.conf

Increase

1 Server 127.127.1.02 Fudge 127.127.1.0 stratum 10

2. Modify /etc/sysconfig/ntpd

Add the following content

1 Sync_hwclock=yes

3. Start the NTPD service (default is not turned on)

1 Service ntpd Start 2 chkconfig ntpd on (boot start)

4. Create a scheduled task for hadoop003 and hadoop004 (root, set to 1-minute sync at test time, set to 1 hours after testing, or delete directly)

1 */1 * * * */usr/sbin/ntpdate hadoop002

5. Use date-d today + "%y-%m-%d%T" to observe

Linux Time synchronization NTP