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Using clone() or unshare(), we can create a network namespace. Just as the command:
ns_exec -nm -- /bin/bash
(see http://lxc.sourceforge.net/index.php/about/kernel-namespaces/network/configuration/)
If I have created several network namespaces with ns_exec command, where can I see them? or
How can i count the numbers of network namespaces?
You observe them indirectly. Say, lo devices are independent, iptables rules are independent and so on.
netns objects live in it’s own kmem_cache:
grep net_namespace /proc/slabinfo
But this is unreliable way to count them, as SLUB can share caches.
There is no /proc file or something dedicated specifically as netns counter.