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Editor to share with you how centos7 started to use chronyd synchronization time, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

When installing RAC12C in centos7.4, the pre-check during the installation of oracle software will encounter the problem of time out of sync.

Redheat7 starts using chronyd to synchronize time

There are three kinds of time synchronization.

1.ntp, not here.

2.redheat7 starts using chronyd to synchronize time

Ctss process of 3.rac

After the installation of crsctl check ctss is completed, it is active. Turning on chronyd will shut down automatically.

[grid@ibisdb1 ~] $crsctl check ctss

CRS-4700: The Cluster Time Synchronization Service is in Observer mode.

Configure chronyd: (192.168.56.1 is ntp server)

Vi / etc/chrony.conf

# server 0.centos.pool.ntp.org iburst

# server 1.centos.pool.ntp.org iburst

# server 2.centos.pool.ntp.org iburst

# server 3.centos.pool.ntp.org iburst

Server 10.1.3.1 prefer

Systemctl status chronyd.service-View status

Systemctl start chronyd.service-start

Systemctl enable chronyd.service-make it self-booting

Systemctl status chronyd.service

View time synchronization source

Chronyc sources-v

Chronyc sourcestats-v

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