我想让我自己的云安装监听端口80.现在它监听端口81.所以在apache2 / ports.conf中，我添加了
听80
当我想重启apache 2时，它给了我： apache2.service的作业失败，因为控制进程退出并显示错误代码。
当我试图找出哪个进程可能使用该端口时，键入： lsof -i：80 我一无所获。所以没有任何进程似乎听那个端口。
可能出了什么问题？
我的整个配置：
Listen 81
<IfModule ssl_module>
Listen 443
</IfModule>
<IfModule mod_gnutls.c>
Listen 443
</IfModule>
Listen 82
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
netstat -a | grep LISTEN给了我
tcp 0 0 0.0.0.0:nntps 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:ssh 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:nntp 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:504 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:smtp 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:microsoft-ds 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:imaps 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:pop3s 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:2020 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:xmpp-client 0.0.0.0:* LISTEN
tcp 0 0 localhost:mysql 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:submission 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:netbios-ssn 0.0.0.0:* LISTEN
tcp 0 0 localhost:11211 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:pop3 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:imap2 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:http 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:urd 0.0.0.0:* LISTEN
tcp6 0 0 [::]:ssh [::]:* LISTEN
tcp6 0 0 ip6-localhost:3350 [::]:* LISTEN
tcp6 0 0 [::]:3389 [::]:* LISTEN
tcp6 0 0 [::]:microsoft-ds [::]:* LISTEN
tcp6 0 0 [::]:netbios-ssn [::]:* LISTEN
tcp6 0 0 [::]:81 [::]:* LISTEN
tcp6 0 0 [::]:82 [::]:* LISTEN
[Wed Apr 04 20:26:55.673090 2018] [mpm_prefork:notice] [pid 1082] AH00163: Apache/2.4.25 (Raspbian) configured -- resuming normal o$
[Wed Apr 04 20:26:55.673314 2018] [core:notice] [pid 1082] AH00094: Command line: '/usr/sbin/apache2'
[Wed Apr 04 20:27:44.980083 2018] [mpm_prefork:notice] [pid 1082] AH00169: caught SIGTERM, shutting down
[Wed Apr 04 20:28:04.370959 2018] [mpm_prefork:notice] [pid 1162] AH00163: Apache/2.4.25 (Raspbian) configured -- resuming normal o$
[Wed Apr 04 20:28:04.371181 2018] [core:notice] [pid 1162] AH00094: Command line: '/usr/sbin/apache2'
[Wed Apr 04 20:31:12.299314 2018] [mpm_prefork:notice] [pid 1162] AH00169: caught SIGTERM, shutting down
[Wed Apr 04 20:31:12.703337 2018] [mpm_prefork:notice] [pid 1226] AH00163: Apache/2.4.25 (Raspbian) configured -- resuming normal o$
[Wed Apr 04 20:31:12.703553 2018] [core:notice] [pid 1226] AH00094: Command line: '/usr/sbin/apache2'
[Wed Apr 04 20:31:31.775335 2018] [core:notice] [pid 1226] AH00052: child pid 1230 exit signal Segmentation fault (11)
[Wed Apr 04 20:31:32.789760 2018] [mpm_prefork:notice] [pid 1226] AH00169: caught SIGTERM, shutting down
[Wed Apr 04 20:34:07.337845 2018] [mpm_prefork:notice] [pid 1334] AH00163: Apache/2.4.25 (Raspbian) configured -- resuming normal o$
[Wed Apr 04 20:34:07.338077 2018] [core:notice] [pid 1334] AH00094: Command line: '/usr/sbin/apache2'
[Wed Apr 04 20:37:03.819967 2018] [mpm_prefork:notice] [pid 1334] AH00169: caught SIGTERM, shutting down
[Wed Apr 04 20:37:30.130293 2018] [mpm_prefork:notice] [pid 1439] AH00163: Apache/2.4.25 (Raspbian) configured -- resuming normal o$
[Wed Apr 04 20:37:30.130520 2018] [core:notice] [pid 1439] AH00094: Command line: '/usr/sbin/apache2'
[Wed Apr 04 20:51:34.940551 2018] [mpm_prefork:notice] [pid 1439] AH00169: caught SIGTERM, shutting down