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Chrony Time Sync Failed When It Is Configured With IB Network (Doc ID 2639861.1)

Last updated on FEBRUARY 23, 2020

적용 대상:

Exadata X6-2 Hardware - 버전 All Versions to All Versions [릴리즈 All Releases]
Linux x86-64

증상

On : NA version, ENVIRONMENTAL

ACTUAL BEHAVIOR
---------------
Cell Node상의 Exadata Image version을 18.1.6.0 에서19.2.3.0 으로 upgrade하였슴.
이후 Chrony를 통한 Time 동기화가 실패함.
Exadata image를 19.2.3.0 으로 upgrade후 Cellwall service가 start되었을 때
아래와 같이 iptables에 잘못된 rule 이 등록되면서 Chrony를 통한 Time 동기화가 실패함


[root@pgieesdcel1 ~]# iptables -xnvL |grep udp
  9736 739936 REJECT udp -- ib1 * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
  0 0 REJECT udp -- ib0 * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
  0 0 ACCEPT udp -- eth0 * X,X.X.X 0.0.0.0/0 udp dpt:162
  0 0 ACCEPT udp -- eth0 * X,X.X.X 0.0.0.0/0 udp spt:623 dpts:1024:65535
  0 0 ACCEPT udp -- eth0 * 192.168.10.3 0.0.0.0/0 udp spt:123
  0 0 ACCEPT udp -- eth0 * 192.168.10.1 0.0.0.0/0 udp spt:123
  44784 15537312 REJECT udp -- eth0 * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
  8973 638946 ACCEPT udp -- lo * 0.0.0.0/0 0.0.0.0/0
  0 0 REJECT udp -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable


BUSINESS IMPACT
-----------------------
Can't synchronize time between NTP server and cell servers.

현재 3rd cell node만 Cellwall service를 stop하여 정상적으로 Time 동기화가 이루어지고 있슴.

변경 내역

 Cell Node상의 Exadata Image version을 18.1.6.0 에서19.2.3.0 으로 upgrade하였슴.

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