Apache2 sigterm在Debian上崩溃

Question

I have an issue with my debian server.
I have a website hosted on an apache2 but 2 times per day, apache crash and my website is not accessible.
I have looked log files and I haven't a lot of information.
Here are my logs :

access.log

13.235.52.55:443 - - [24/May/2018:10:05:51 +0200] "GET / HTTP/1.1" 200 13244 "-" "Python-urllib/2.7"
13.235.52.55:443 - - [24/May/2018:10:05:52 +0200] "GET / HTTP/1.1" 200 13309 "-" "Python-urllib/2.7"
13.235.52.55:443 - - [24/May/2018:10:05:52 +0200] "GET / HTTP/1.1" 200 13309 "-" "Python-urllib/2.7"
13.235.52.55:443 - - [24/May/2018:10:05:53 +0200] "GET / HTTP/1.1" 200 13309 "-" "Python-urllib/2.7"
13.235.52.55:443 - - [24/May/2018:10:05:54 +0200] "GET / HTTP/1.1" 200 13309 "-" "Python-urllib/2.7"

error.log

[Thu May 24 08:00:31.698217 2018] [mpm_prefork:notice] [pid 3544] AH00163: Apache/2.4.10 (Debian) OpenSSL/1.0.1t configured -- resuming normal operations
[Thu May 24 08:00:31.698270 2018] [core:notice] [pid 3544] AH00094: Command line: '/usr/sbin/apache2'
[Thu May 24 12:17:43.064962 2018] [mpm_prefork:notice] [pid 3544] AH00169: caught SIGTERM, shutting down
[Thu May 24 12:17:46.968823 2018] [mpm_prefork:notice] [pid 4518] AH00163: Apache/2.4.10 (Debian) OpenSSL/1.0.1t configured -- resuming normal operations
[Thu May 24 12:17:46.968889 2018] [core:notice] [pid 4518] AH00094: Command line: '/usr/sbin/apache2'
[Thu May 24 12:17:47.011670 2018] [mpm_prefork:notice] [pid 4518] AH00169: caught SIGTERM, shutting down

Generally, apache crash at 12:17PM and 00:17AM

I have already check for a DoS attack, but I have not enough access in the access.log

Finally, I have found the following in my phperror log

[24-May-2018 13:39:01 Europe/Berlin] PHP Warning: Module 'PDO' already loaded in Unknown on line 0
[24-May-2018 14:09:01 Europe/Berlin] PHP Warning: Module 'PDO' already loaded in Unknown on line 0
[24-May-2018 14:39:01 Europe/Berlin] PHP Warning: Module 'PDO' already loaded in Unknown on line 0
[24-May-2018 15:09:01 Europe/Berlin] PHP Warning: Module 'PDO' already loaded in Unknown on line 0
[24-May-2018 15:39:01 Europe/Berlin] PHP Warning: Module 'PDO' already loaded in Unknown on line 0
[24-May-2018 16:04:24 Europe/Berlin] PHP Warning: Module 'PDO' already loaded in Unknown on line 0
[24-May-2018 16:09:01 Europe/Berlin] PHP Warning: Module 'PDO' already loaded in Unknown on line 0

if someone can help me.. :-)

Thank you !

EDIT : This is my journalctl when apache crashs journalctl

Answer 1

Ok, finally i've found where was the problem.

It was due to Certbot. I had 2 domains not used for a long time and the SSL certificates was expirated. I have remove these certificates and my apache is currently running for 1 day and 13 hours.

If this solution can help someone.. ;)