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

What is your nginx.conf look like? I assume you have not changed the config, maybe just added the gzip and a new include folder to have separate location for the websites. For each of your doman / sub-domain have a separate config file. Like:

• example.com & www.example.com
• api.example.com
• blog.example.com

This is because I assume these are separate websites under the same domain. If they are on the same website and they are just a so-called sub-page, then you would be better at creating just sub-pages with the location options.

To re-organise your nginx config I would create a com.example.conf file with 3 separate server sections. First is to redirect the non-www users to the www website:

server {
    listen       80;
    server_name  example.com;
    return       301 https://www.example.com$request_uri;
}

server {
    listen       443 ssl;
    server_name  example.com;
    return       301 https://www.example.com$request_uri;
}

The third section would contain the main site:

server {
    listen 443 ssl;

    server_name example.com www.example.com;

    root /var/www/example.com/public_html/web;

    index    index.php;

    error_log /var/log/nginx/www.example.com_error.log;
    access_log /var/log/nginx/www.example.com_access.log;

    location / {
        # try to serve file directly, fallback to front controller
        try_files $uri /index.php$is_args$args;
    }

    location ~ ^/index\.php(/|$) {
        fastcgi_pass   unix:/var/run/php/php7.0-fpm.sock;

        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param HTTPS off;
        fastcgi_param   DATABASE_NAME           some;
        fastcgi_param   DATABASE_USER           some_user;
        fastcgi_param   DATABASE_PASSWORD       some_pwd;
    }

    location ~ \.php$ {
        return 404;
    }
}

(I have to say, your fastcgi part in your index.php location looks weird to me, but I'll leave that to you)

Then create separate config files as com.example.api.conf and com.example.blog.conf. Add the first two sections from the previous config similarly as before, then you can just add yourself each sub-domain a different config for the locations.

For example I have this for my laravel websites:

rewrite ^/index\.php?(.*)$ /$1 permanent;

location / {
        try_files $uri @rewrite;
}

location        @rewrite {
        rewrite ^(.*)$ /index.php/$1 last;
}
location ~ ^/index.php(/|$) {
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param HTTPS on;
        fastcgi_buffers 16 16k;
        fastcgi_buffer_size 32k;
        fastcgi_read_timeout 299;
}

Hope this helps you, if not, comment your questions.

To fix the bind() to 0.0.0.0:80 or 443 failed (98: Address already in use)

Run following commands:

sudo pkill -f nginx & wait $!

sudo systemctl start nginx