Sudden instance reboot

Question

Hi,  
  
One EC2 instance was rebooted on 18th May 16:19:28, and I couldn't find any suspicious log.  
instance id : i-09e71ce18d979de70  
 /var/log/messages-20190519 snippet

```
May 18 16:04:54 ip-xxxxx dhclient[3093]: XMT: Solicit on eth0, interval 124860ms.
May 18 16:04:54 ip-xxxxx dhclient[3093]: send_packet6: Network is unreachable
May 18 16:04:54 ip-xxxxx dhclient[3093]: dhc6: send_packet6() sent -1 of 52 bytes
May 18 16:19:28 ip-xxxxx kernel: imklog 5.8.10, log source = /proc/kmsg started.
May 18 16:19:28 ip-xxxxx rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="3327" x-info="http://www.rsyslog.com"] start
May 18 16:19:28 ip-xxxxx kernel: [    0.000000] Linux version 4.14.77-70.59.amzn1.x86_64 (mockbuild@gobi-build-64001) (gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)) #1 SMP Mon Nov 12 22:02:45 UTC 2018
```

I have read a few similar post from this forum, and understood that running degraded hardware could be one reason.  
I'd like to know if this was the case.   
Is it possible to investigate about it?  
  
Thank you,  
Sunkyung Choi  
  
Edited by: SunkyungChoi on May 28, 2019 5:36 PM

Answer

Found a similar question here  
https://forums.aws.amazon.com/thread.jspa?messageID=877040#jive-message-877291  
  
and able to see the `StatusCheckFailed_System` label.(As described here https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-system-instance-status-check.html#types-of-instance-status-checks)  
  
Edited by: SunkyungChoi on May 29, 2019 5:07 PM

Sudden instance reboot

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