How to exchange information between K8s node?

now I have 8 node, programs running the same java program in K8s.
if you send a message to someone at 10:00 every day, eight node will be sent eight times.
but you only need to send it once.

is there any way to set flag bits to allow 8 node messages to communicate with each other?

the method of inserting the record of the message sent into the MySQL should not work. When inserting it, other node will repeat the message if it is not recorded in the database.

Kubernetes k8s

Apr.25,2021

finally uses the method of inserting into MYSQL

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Kube-apiserver default port range
I want to change the nodePort range of K8s and modify the startup parameters of kube-apiserver. however, when I added this parameter, I found that the api would not work as long as the port range was not 30000-32768. I have another environment, th...

Kubernetes k8s

Mar.20,2021

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e45bc3-44b67.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e45bc3-44b67.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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