“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 – through RDO – 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

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

And that’s it. Really.Now one can run

12	#> ip netns add spredzy#> ip netns list

spredzy should get displayed.If everything is working one should have the following kernel and iproutepackages installed :

123	kernel-2.6.32-358.123.2.openstack.el6.x86_64kernel-firmware-2.6.32-358.123.2.openstack.el6.noarchiproute-2.6.32-130.el6ost.netns.2.x86_64