我将Nginx用作Apache的反向代理。我有一个域，可以说它example.com指向/var/www/html/example目录。

我想将一个子域phpmyadmin.example.com指向一个目录/var/www/html/phpmyadmin，该目录显然不是该域目录的子目录。

我的完整配置文件/etc/nginx/sites-enabled/example如下所示。我在##### BEGIN ..和之间添加了部分，并将###### END ..其添加到我的配置文件中，以尝试实现此目的。

然后，我确实sudo service nginx restart成功地重新启动了NGINX，但仍然无法访问phpmyadmin.example.com。

这是我的配置：

server {
    root /var/www/html/example;

    # Add index.php to the list if you are using PHP
    index index.php index.html index.htm index.nginx-debian.html;

    server_name example.com;

        access_log /var/www/html/example/access.log;
        error_log /var/www/html/example/error.log;

    location / {
        # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        try_files $uri $uri/ /index.php?$args;
    }

    # pass PHP scripts to FastCGI server
    #
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
    #
    #   # With php-fpm (or other unix sockets):
        fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
    #   # With php-cgi (or other tcp sockets):
    #   fastcgi_pass 127.0.0.1:9000;
    }

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    location ~ /\.ht {
        deny all;
    }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}

##### BEGIN PHPMYADMIN CONFIG    #####
server {
    root /var/www/html/phpmyadmin;

    index index.php index.html index.htm index.nginx-debian.html;

    server_name phpmyadmin.example.com;

    location / {
        # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        try_files $uri $uri/ /index.php?$args;
    }

    # pass PHP scripts to FastCGI server
    #
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
    #
    #   # With php-fpm (or other unix sockets):
        fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
    #   # With php-cgi (or other tcp sockets):
    #   fastcgi_pass 127.0.0.1:9000;
    }
}
###### END OF PHPMYADMIN CONFIG #####

server {
    if ($host = www.example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80 ;
    listen [::]:80 ;

    server_name example.com www.example.com
    return 404; # managed by Certbot
}