I highly suggest starting with the tools I provided in an earlier response. You do have a few accounts that had higher bandwidth totals for the month. I suggest reviewing those accounts bandwidth usage in their respective cPanel accounts (cPanel >> Home >> Metrics >> Bandwidth). Another tool that may be useful would be AWStats, though this is assuming the bandwidth spike is caused by web traffic.
I would also like to clarify that only certain bandwidth information is logged and the list can be found at:
https://documentation.cpanel.net/display/74Docs/Bandwidth#Bandwidth-Non-recordedbandwidthinformation
If the cPanel and/or WHM Bandwidth tools do not offer you the information you require, you will need to find a third-party tool to find this information. As a courtesy, I found some external resources that may assist you with finding which user/process is causing bandwidth spikes:
https://www.slashroot.in/find-network-traffic-and-bandwidth-usage-process-linux
https://askubuntu.com/questions/706928/how-to-tell-which-processes-are-uploading-and-downloading-data-and-how-much (I checked a test server and nethogs is available on RHEL/CentOS)
Best Regards,
I would also like to clarify that only certain bandwidth information is logged and the list can be found at:
https://documentation.cpanel.net/display/74Docs/Bandwidth#Bandwidth-Non-recordedbandwidthinformation
If the cPanel and/or WHM Bandwidth tools do not offer you the information you require, you will need to find a third-party tool to find this information. As a courtesy, I found some external resources that may assist you with finding which user/process is causing bandwidth spikes:
https://www.slashroot.in/find-network-traffic-and-bandwidth-usage-process-linux
https://askubuntu.com/questions/706928/how-to-tell-which-processes-are-uploading-and-downloading-data-and-how-much (I checked a test server and nethogs is available on RHEL/CentOS)
Best Regards,
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