Oracle RAC installation PRVG-13606 NTP synchronous error resolution process

Oracle NTP check Error

./runcluvfy.sh Stage-pre Crsinst-n Oracle57,oracle58-verbose

[10:06:58] Verifying Network time Protocol (NTP) ... FAILED
[10:06:58] prvg-1063:configuration files for more than one time synchronization service
[10:06:58]were found on nodes of the cluster
[10:06:58]configuration file "/etc/chrony.conf" was found on nodes "Oracle58,oracle57"
[10:06:58]configuration file "/etc/ntp.conf" was found on nodes "Oracle58,oracle57"
[10:06:58]
[10:06:58] Verifying chrony daemon is synchronized with at least one external time
[10:06:58] Source ... FAILED
[10:06:58] Oracle58:prvg-13606:chrony daemon is not synchronized with any external
[10:06:58] Time Source on node "oracle58".
[10:06:58]
[10:06:58] Oracle57:prvg-13606:chrony daemon is not synchronized with any external
[10:06:58] Time Source on node "Oracle57".

Hint that there is no external time source, check that ntpq-p is normal and need to confirm that Ntpstat is showing synchronization.

Ntpstat display is not synchronized, ntpq-p or ntpq-c peers display sync arrives

[root@oracle58 ~]# ntpstat
unsynchronised
polling server every 64 s

[root@oracle58 tmp]# ntpq -p
remote refid st t when poll reach delay offset jitter

*192.168.1.25 85.199.214.100 2 U 5 64 377 0.406 20.282 8.062

[root@oracle58 tmp]# ntpq -c peers
remote refid st t when poll reach delay offset jitter

*192.168.1.25 85.199.214.100 2 U 32 64 377 0.406 20.282 8.062
[root@oracle58 tmp]#

You need to check whether the firewall, Seliunx, and so on have been shut down.

My environment is after the SELinux is turned off, wait a moment Ntpstat show synchronization

[root@oracle58 tmp]# ntpstat
synchronised to NTP server (192.168.1.25) at stratum 3
time correct to within 195 ms
polling server every 64 s
[root@oracle58 tmp]#

./runcluvfy.sh Stage-pre Crsinst-n Oracle57,oracle58-verbose

Failures were encountered during execution of CVU verification request "Stage-pre Crsinst".

Verifying Network time Protocol (NTP) ... FAILED
prvg-1063:configuration files for more than one time synchronization service
were found on nodes of the cluster
Configuration file "/etc/chrony.conf" was found on nodes "Oracle58,oracle57"
Configuration file "/etc/ntp.conf" was found on nodes "Oracle58,oracle57"

Prompts NTP to configure multiple times,/etc/ntp.conf Delete, and then check.

Check the environment again, it will show all success

Pre-Check for Cluster services setup was successful.

CVU Operation Performed:stage-pre Crsinst
Date:jul, 2018 11:29:19 AM
CVU Home:/tmp/oracle/grid/
User:grid

Reference links
https://www.linuxquestions.org/questions/linux-server-73/ntp-client-error-ntpstat-shows-unsynchronised-749641/

Oracle RAC installation PRVG-13606 NTP synchronous error resolution process

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