Here is how to disable SSLv3 in apache and nginx.
Just for fun, before you do it, scan your site with this tool:
https://www.tinfoilsecurity.com/poodle
Qualys SSL Server Test (this one is much better. tinfoilhat was the first one i found that found poodle)
In apache, add to your apache config apache2.conf or security.conf:
SSLProtocol all -SSLv2 -SSLv3
In Nginx, add this to your HTTP block:
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
Now use https://www.tinfoilsecurity.com/poodle to scan it again.
done.