Shulou(Shulou.com)06/03 Report--

[JDK]

All machines in the cluster should be running the same version of Java, even at the patch level

[cron]

The cron daemon drives scheduled tasks

[ntp]

Select the primary node to be the local ntp server for all other nodes

[ssh]

[postifx/sendmail]

Send an email in case of error

[rsync]

Effectively copy files between the local and host

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