In general CoreOS is used for creating cluster . So which ports should be open by default in coreOS ?

[Parag Gupta]

I am hardening the coreOS image using cis Linux independent checks. Can you tell me which ports should be opened by default? As per cis drop policy should be applied.

[Parag Gupta]

as far as i know port 2379 and 2380 should be opened if etcd cluster is being used . am i right ?  

Can i launch a cluster without etcd nodes ? i am askng this because if i can launch cluster without etcd how locksmith and fleet take care of updates and service management . They use etcd for same .

[Rob Szumski]

Yes, that's correct. If you want to use etcd, those are the ports.

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