Cluster clock synchronization configuration

The idea of cluster clock synchronization

1、 Each server node in the distributed cluster can connect to the Internet

Ideas ：

Mode of operation ：

# send ⽤ ntpdate ⽹ Network time synchronization command
ntpdate -u ntp.api.bz # from ⼀ Time servers synchronize time  

windows Planned tasks
Linux There are also scheduled tasks ,crond, have access to linux Scheduled tasks for , every other 10 Minute execution ⼀ Time ntpdate command

2、 In a distributed cluster ⼀ Server nodes can access the Internet ⽹ Or all nodes cannot access the Internet

X Ideas ：

Mode of operation ：

Select... In the cluster ⼀ Server nodes A(172.17.0.17) As a time server （ The whole cluster time starts from this service
Synchronizer , If this server can access the Internet , You can keep this server synchronized with the network time , If you don't
It can be set manually ⼀ Time ） 

First set up A Time for

hold A Configured as a time server （ modify /etc/ntp.conf file ）

1、 If there is restrict default ignore, Comment it out
2、 Add the following lines
restrict 172.17.0.0 mask 255.255.255.0 nomodify notrap # Let go of the game
Domain network synchronization function ,172.17.0.0 It's your LAN segment
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
3、 Restart and configure ntpd The service starts automatically
service ntpd restart
chkconfig ntpd on

Other nodes in the cluster can be accessed from A Server synchronization time  

ntpdate 172.17.0.17