1. 아이피에 따른 접근 허용

Create a new virtual host file, and setup like this:

<VirtualHost *:80>
        ServerAdmin webmaster@localhost
        ServerAlias 192.168.1.1 
        DocumentRoot /somewhere/public_html
        <Directory /somewhere/public_html/>
         Options Indexes FollowSymLinks MultiViews ExecCGI
         AllowOverride Authconfig FileInfo
         Require all granted
        </Directory>
</VirtualHost>

2. 조금 더 기능이 필요한 경우(파악필요)

" <http://162.243.93.216/info.php> then /var/www/html/info.php is opened "

I am assuming this already works (If not, uncomment the ServerAlias line shown in the conf below)

You now want to map

http://162.243.93.216/projecta/ to /var/www/projectahttp://162.243.93.216/projectb/ to /var/www/projectb

For this you need to use the Apache Alias directive.

Update your 000-default.conf file to:

<VirtualHost *:80>
    # ServerAlias 162.243.93.216
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html

    Alias /projecta /var/www/projecta
    Alias /projectb /var/www/projectb

    <Directory /var/www/>
            Options Indexes FollowSymLinks MultiViews
            AllowOverride All
            Order allow,deny
            allow from all
     </Directory>

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>