Nginx的即时configuration重载会导致错误

我试图运行一个“nginx -c /etc/nginx/nginx.conf”但我得到：

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() [Exit 1] 

然后我运行一个

  fuser -k 80/tcp ; service nginx restart. 

我再次尝试用“nginx -c /etc/nginx/nginx.conf”，但是仍然出现同样的错误“[emerg] bind（）到0.0.0.0:80失败（98：Address already in use）”

为什么发生这种情况？

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