/var/log/apache2/error.log
[Sun Dec 18 06:25:04.024324 2016] [mpm_prefork:notice] [pid 17291] AH00163: Apache/2.4.18 (Ubuntu) OpenSSL/1.0.2g configured -- resuming normal operations
[Sun Dec 18 06:25:04.024408 2016] [core:notice] [pid 17291] AH00094: Command line: '/usr/sbin/apache2'
/var/log/mysql/error.log
empty
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Logs you posted doesn’t present problem. Moreover, it’s normal - Apache can start itself multiple times to serve requests. Take a look at ServerFault thread - Apache is OK, but what is this in error.log - [mpm_prefork:notice]?. It explained this log entries pretty well.
Isn’t there more things in your
error.log
? With this part, it’s not possible to debug it.In meanwhile what’s your server size? Maybe you can verify that instances doesn’t get killed because of Out of memory. Check syslog,
/var/log/syslog
, and make sure there isn’t any OOM, OOM killer entries for Apache. Probably not a problem, but check it.