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I am running centos 6.x on my server. It rebooted itself at 10.30am and 11.13am today.

I checked /var/log/messages file and couldn't understand. What can be cause to reboot?

My log file (I couldn't paste it here because character limit):

http://pastebin.com/R9VN3nSJ

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Check your servers memory by memtest86+. You can install it on the Centos system:

# yum -y install memtest86+
# memtest-setup

Then reboot system and choose memtest at boot grub menu. Before all you need to ensure that klogd is running and kernel log file exists at /var/log/kernel.

I think reboot initiated by watchdog timer. If memory is good then show us dmesg command output and /var/log/kernel file.

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