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What is this error mean

Time:04-26

Server operating system is CentOS7, deploy a web site, and now in this website to others use, users can be created on the server when using container, do similar offensive and defensive range drills,
But always server outage recently, is to find a tomcat agent run at backend module all stopped, terminal server to run the script also stopped, and then docker container were stopped, more like a server restart themselves, generally there are twenty containers in operation will appear this kind of situation,
Then again this problem today, remote login after the prompt:



Feeling that caused by docker what the problem is, but don't understand, would like to ask the tip is what mean? How should solve?
Have any Suggestions and questions about the server goes down, didn't find the reason,

Thank you very much!
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