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I am having problems with my Ubuntu 10.04.4 LTS server. My monitor application claims it goes off every morning at about 4 AM for 5 to 10 minutes. I am not sure where to start the troubleshooting process, but I have confirmed the following:

# uptime
09:51:32 up 6 days, 12:48,  2 users,  load average: 1.35, 1.39, 1.57

A graph of my server's CPU load over 2 days:

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A graph of my server's ping results over 2 days:

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Is there a log similar to event viewer (From Windows) in ubuntu server? I am not sure which log file to interpret or check since there are various logs with a lot of information to process. I do not have time to go through all of them. Therefore I am asking which log I can start with to isolate all the activities to those that happened in the problematic hours.

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how do you connect to your server, is this a "usual" landline? –  Dennis Nolte Mar 25 '14 at 8:47
maybe check if you have a crontabtask at those times? if not ubuntu like debian is syslog heavy, so /var/log/syslogis a good place to start. –  Sverre Mar 25 '14 at 9:34
Look into /var/log/kern.log and /var/log/syslog , as well as the dmesg command. In any case your server's load is very high, you want to start checking with tools like 'top` what processes are taking the resources. –  LinuxDevOps Mar 25 '14 at 13:18

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