Is there a way to get notified when new netns is created

[msherif1234]

my application when it starts it detect all available netns by looking at /var/run/netns but while its running if new netns is created my application won't know anything about it and as a result it won't know about links and their attributes

what is the best way to know runtime when netns is created so we can use LinkSubscribeAt() for it ?

[bn222]

I believe we can use inotify to watch for creation/deletion events in /var/run/netns

[msherif1234]

Yeah I added inotify and when netns is created I subscribe for notificatoin using netlink.LinkSubscribeAt but it failed here

[msherif1234]

cc'd @vishvananda
I have an easy reproducer w/o using k8s or docker

• clone https://github.com/netobserv/netobserv-ebpf-agent
• make build
• sudo FLOWS_TARGET_HOST=127.0.0.1 FLOWS_TARGET_PORT=9999 ./bin/netobserv-ebpf-agent
• sudo ip netns add n1
  that will result into

ERRO[0009] can't subscribe to links netns NS(16: 25, 58164)  component=ifaces.Watcher error="failed to set into network namespace 16 while creating netlink socket: invalid argument"