跟着老师的视频做_sub_module模块的示例

修改了default.conf，后重启报错,还望老师能抽出时间帮我看一下，这是什么原因造成的，在此先感谢老师！！

location / {
root /opt/app/code;
index index.html index.htm;
sub_filter '<a>imooc' '<a>IMOOC';
}

具体报错如下

[root@localhost conf.d]# systemctl reload nginx

Job for nginx.service invalid.

[root@localhost conf.d]# systemctl status nginx.service

● nginx.service - nginx - high performance web server

   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)

   Active: inactive (dead)

     Docs: http://nginx.org/en/docs/

10月 17 23:07:01 localhost.localdomain systemd[1]: Unit nginx.service cannot be reloaded because it is inactive.

[root@localhost conf.d]# systemctl status nginx.service

● nginx.service - nginx - high performance web server

   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; vendor preset: disabled)

   Active: failed (Result: exit-code) since 二 2017-10-17 23:19:04 CST; 27s ago

     Docs: http://nginx.org/en/docs/

  Process: 1647 ExecStartPre=/usr/sbin/nginx -t -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)

10月 17 23:19:04 localhost.localdomain systemd[1]: Starting nginx - high performance web server...

10月 17 23:19:04 localhost.localdomain nginx[1647]: nginx: the configuration file /etc/nginx/nginx.conf syntax is ok

10月 17 23:19:04 localhost.localdomain systemd[1]: nginx.service: control process exited, code=exited status=1

10月 17 23:19:04 localhost.localdomain nginx[1647]: nginx: [emerg] open() "/var/run/nginx.pid" failed (13: Permission denied)

10月 17 23:19:04 localhost.localdomain nginx[1647]: nginx: configuration file /etc/nginx/nginx.conf test failed

10月 17 23:19:04 localhost.localdomain systemd[1]: Failed to start nginx - high performance web server.

10月 17 23:19:04 localhost.localdomain systemd[1]: Unit nginx.service entered failed state.

10月 17 23:19:04 localhost.localdomain systemd[1]: nginx.service failed.

我使用nginx -t -c /etc/nginx/nginx.conf发现也没问题

[root@localhost conf.d]# nginx -t -c /etc/nginx/nginx.conf

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok

nginx: configuration file /etc/nginx/nginx.conf test is successful

[root@localhost nginx]#  nginx -c /etc/nginx/nginx.conf

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

nginx: [emerg] still could not bind()