sudo visudo
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# add this like in visudo
www-data ALL=(ALL) NOPASSWD: /usr/sbin/a2ensite, /usr/sbin/service apache2 reload

www-data ALL=(ALL) NOPASSWD: /usr/sbin/a2ensite, /usr/sbin/a2dissite, /usr/sbin/service apache2 reload

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chmod +x /for/all/the/scripts

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chmod 755 /var/labsstorage/home/kalaiyarasan.offl.2004/htdocs/gosite/htdocs/

chown -R www-data:www-data /home/kalaiyarasan.offl.2004/htdocs/gosite/site/

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chown www-data:www-data /etc/apache2/sites-available

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