Literate DevOps

Document everything you do on a system in an executable, reusable format: http://www.howardism.org/Technical/Emacs/literate-devops.html

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Firefox was slow. I disabled IPv6. Now Firefox is fast.

Type this:

sudo bash
echo '1' > /proc/sys/net/ipv6/conf/lo/disable_ipv6  
echo '1' > /proc/sys/net/ipv6/conf/lo/disable_ipv6  
echo '1' > /proc/sys/net/ipv6/conf/all/disable_ipv6  
echo '1' > /proc/sys/net/ipv6/conf/default/disable_ipv6

http://ccm.net/faq/759-ubuntu-disabling-ipv6-support