neutron IOError: [Errno 2] No such file or directory: '/proc/sys/net/ipv6/conf/default/disable_ipv6'

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Error:
neutron IOError: [Errno 2] No such file or directory: '/proc/sys/net/ipv6/conf/default/disable_ipv6'
Due to this error, the neutron-l3-agent does not start up. End errors out. with the above error. There is a bug filed for this and patched in releases after Icehouse.

Solution

This bug is fixed by doing this

curl -o /usr/lib/python2.6/site-packages/neutron/common/ipv6_utils.py https://raw.githubusercontent.com/openstack/neutron/stable/icehouse/neutron/common/ipv6_utils.py

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