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

Posted 2020-10-19 Tinywan

今天服务器安装了NodeJs,服务器实在卡的不行，就重启了，结果重启后，nginx没有自动重启。果断的手动重启，结果问题来了

在ubuntu16.04上面尝试启动nginx，使用命令：

sudo /etc/init.d/nginx start

启动不了啊！出错了哎！提示的错误信息：

[email protected]:~$ sudo /usr/local/openresty/nginx/sbin/nginx
nginx: [warn] could not build optimal variables_hash, you should increase either variables_hash_max_size: 1024 or variables_hash_bucket_size: 64; ignoring variables_hash_bucket_size
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()

查看80端口是不是被占用了

[email protected]:~$ netstat -anp |grep 80
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      -               
tcp        0      0 内网IP:50852     外网IP:80      ESTABLISHED -               
unix  2      [ ACC ]     STREAM     LISTENING     13580    -                   /var/run/nscd/socket
unix  3      [ ]         STREAM     CONNECTED     13809    -       

遇到这种问题我先用中文搜索了一下答案，发现大家都在装逼地说要杀nginx重复的进程。我试了下发现是扯淡，于是看了谷歌搜到的第一个英文页面，老外说是nginx先监听了ipv4的80端口之后又监听了ipv6的80端口，于是就重复占用了。更加坑人的是你去看了端口占用它又把80端口释放了，是不是很囧。  解决方案是编辑nginx的配置文件

　　

我的配置

    # 配置HTTP请求重定向
    server {
        # 监听所有的ipv4的地址
        listen 80 default_server;
        # 监听所有的ipv6的地址
        listen [::]:80 default_server;
        server_name  _;
        # Redirect all HTTP requests to HTTPS with a 301 Moved Permanently response.
        return 301 https://$host$request_uri;
        # 过滤爬虫
        if ($http_user_agent ~* "python|curl|java|wget|httpclient|okhttp") {
            return 503;
        }
    }

修改这一段

listen [::]:80 default_server;

修改后

listen [::]:80 ipv6only=on default_server;

 

 

http://www.hankcs.com/appos/linux/fix-nginx-bind-err.html