“Object "netns" is unknown, try "ip help".\n'”报错

tail -f/var/log/neutron/dhcp-agent.log

By default, CentOS 6.4 does not support network namespaces. If one wants totest the new virtualization platforms (Docker, OpenStack, & co…) on aCentOS server, all features won’t be available.
For OpenStack for example, Neutron won’t work as expected, since it actuallyneeds network namespace to create networks,

Fortunately, RedHat �C through RDO �C provides a kernel that get this feature backported.

So, before updating the kernel, if one runs :

1	#>  ip netns list

s/he will be presented with the following error message : Object “netns”is unknown, try “ip help”.

The following steps needs to be realized to install the new kernel andenable the network namespace feature

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#>  yum install -y http://rdo.fedorapeople.org/rdo-release.rpm #>  yum install kernel iproute #>  reboot

And that’s it. Really.

Now one can run

1 2	#>  ip netns add spredzy #>  ip netns list

spredzy should get displayed.

If everything is working one should have the following kernel and iproutepackages installed :

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kernel-2.6.32-358.123.2.openstack.el6.x86_64 kernel-firmware-2.6.32-358.123.2.openstack.el6.noarch iproute-2.6.32-130.el6ost.netns.2.x86_64