今天我参考这个将 PHP 版本 7.0 降级到 5.6博客：
现在每次我输入 apache2 restart 命令时sudo service apache2 start都会显示
Job for apache2.service failed because the control process exited with error code.
See "systemctl status apache2.service" and "journalctl -xe" for details.
然后我为了更好地理解我只是简单地跳转到这个命令systemctl status apache2.service它只显示一些代码退出和状态 139
root@server:~# systemctl status apache2.service
● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
Drop-In: /lib/systemd/system/apache2.service.d
└─apache2-systemd.conf
Active: failed (Result: exit-code) since Fri 2020-01-10 11:24:15 UTC; 2min 29s ago
Process: 2708 ExecStart=/usr/sbin/apachectl start (code=exited, status=139)
Jan 10 11:24:15 server.mypcbd.xyz systemd[1]: Starting The Apache HTTP Server...
Jan 10 11:24:15 server.mypcbd.xyz apachectl[2708]: Segmentation fault (core dumped)
Jan 10 11:24:15 server.mypcbd.xyz apachectl[2708]: Action 'start' failed.
Jan 10 11:24:15 server.mypcbd.xyz apachectl[2708]: The Apache error log may have more information.
Jan 10 11:24:15 server.mypcbd.xyz systemd[1]: apache2.service: Control process exited, code=exited s
Jan 10 11:24:15 server.mypcbd.xyz systemd[1]: apache2.service: Failed with result 'exit-code'.
Jan 10 11:24:15 server.mypcbd.xyz systemd[1]: Failed to start The Apache HTTP Server.
我到处搜索，但我不知道该怎么办。请帮帮我，我的服务器刚刚宕机了。
root@server:~# journalctl -xe
Jan 10 12:13:41 server.mypcbd.xyz sshd[3306]: Failed password for root from 222.186.30.12 port 48781
Jan 10 12:13:41 server.mypcbd.xyz sshd[3306]: Received disconnect from 222.186.30.12 port 48781:11:
Jan 10 12:13:41 server.mypcbd.xyz sshd[3306]: Disconnected from authenticating user root 222.186.30.
Jan 10 12:13:41 server.mypcbd.xyz sshd[3306]: PAM 2 more authentication failures; logname= uid=0 eui
Jan 10 12:13:42 server.mypcbd.xyz sshd[3312]: Failed password for invalid user wuv from 52.66.66.20
Jan 10 12:13:42 server.mypcbd.xyz sshd[3312]: Received disconnect from 52.66.66.20 port 48058:11: By
Jan 10 12:13:42 server.mypcbd.xyz sshd[3312]: Disconnected from invalid user wuv 52.66.66.20 port 48
Jan 10 12:13:51 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:13:52 server.mypcbd.xyz sshd[3311]: Connection closed by 114.220.176.106 port 60506 [preau
Jan 10 12:14:11 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:14:30 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:14:51 server.mypcbd.xyz sshd[3315]: pam_unix(sshd:auth): authentication failure; logname=
Jan 10 12:14:51 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:14:52 server.mypcbd.xyz sshd[3315]: Failed password for root from 80.173.177.76 port 43616
Jan 10 12:14:52 server.mypcbd.xyz sshd[3315]: Received disconnect from 80.173.177.76 port 43616:11:
Jan 10 12:14:52 server.mypcbd.xyz sshd[3315]: Disconnected from authenticating user root 80.173.177.
Jan 10 12:15:01 server.mypcbd.xyz CRON[3317]: pam_unix(cron:session): session opened for user root b
Jan 10 12:15:01 server.mypcbd.xyz CRON[3318]: (root) CMD (command -v debian-sa1 > /dev/null && debia
Jan 10 12:15:01 server.mypcbd.xyz CRON[3317]: pam_unix(cron:session): session closed for user root
Jan 10 12:15:10 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:15:30 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:15:52 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:16:11 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:16:31 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:16:42 server.mypcbd.xyz sshd[3320]: Invalid user arma3server from 149.126.32.23 port 59194
Jan 10 12:16:42 server.mypcbd.xyz sshd[3320]: pam_unix(sshd:auth): check pass; user unknown
Jan 10 12:16:42 server.mypcbd.xyz sshd[3320]: pam_unix(sshd:auth): authentication failure; logname=
Jan 10 12:16:44 server.mypcbd.xyz sshd[3320]: Failed password for invalid user arma3server from 149.
Jan 10 12:16:44 server.mypcbd.xyz sshd[3320]: Received disconnect from 149.126.32.23 port 59194:11:
Jan 10 12:16:44 server.mypcbd.xyz sshd[3320]: Disconnected from invalid user arma3server 149.126.32.
Jan 10 12:16:47 server.mypcbd.xyz sshd[3322]: pam_unix(sshd:auth): authentication failure; logname=
Jan 10 12:16:50 server.mypcbd.xyz sshd[3322]: Failed password for root from 222.186.30.35 port 23086
Jan 10 12:16:50 server.mypcbd.xyz kernel: [UFW BLOCK] IN=enp7s0 OUT= MAC=00:e0:2b:68:06:4d:8c:a6:df:
Jan 10 12:16:51 server.mypcbd.xyz sshd[3322]: Failed password for root from 222.186.30.35 port 23086
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语法结果
root@server:~# cd /etc/apache2
root@server:/etc/apache2# apache2ctl configtest
Syntax OK
root@server:/etc/apache2#
结果：
root@server:~# sudo a2dismod php7.0 && sudo a2enmod php5.6 && sudo update-alternatives --set php /usr/bin/php5.6 && sudo service apache2 start
Module php7.0 already disabled
Considering dependency mpm_prefork for php5.6:
Considering conflict mpm_event for mpm_prefork:
Considering conflict mpm_worker for mpm_prefork:
Module mpm_prefork already enabled
Considering conflict php5 for php5.6:
Module php5.6 already enabled
Job for apache2.service failed because the control process exited with error code.
See "systemctl status apache2.service" and "journalctl -xe" for details.
root@server:~#
结果 2：
root@server:~# sudo a2dismod mpm_prefork && sudo a2dismod mpm_worker && sudo a2dismod mpm_event && sudo service apache2 start
ERROR: The following modules depend on mpm_prefork and need to be disabled first: php5.6 php7.2
root@server:~#
结果@Jos：/var/log/apache2/error.log：
[Fri Jan 10 06:25:05.000345 2020] [mpm_prefork:notice] [pid 1551] AH00163: Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1 configured -- resuming normal operations
[Fri Jan 10 06:25:05.000380 2020] [core:notice] [pid 1551] AH00094: Command line: '/usr/sbin/apache2'
[Fri Jan 10 10:45:08.905835 2020] [mpm_prefork:notice] [pid 1551] AH00169: caught SIGTERM, shutting down
[Fri Jan 10 10:45:09.032788 2020] [mpm_prefork:notice] [pid 11277] AH00163: Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1 configured -- resuming normal operations
[Fri Jan 10 10:45:09.032844 2020] [core:notice] [pid 11277] AH00094: Command line: '/usr/sbin/apache2'
[Fri Jan 10 11:01:06.665145 2020] [mpm_prefork:notice] [pid 11277] AH00169: caught SIGTERM, shutting down