Creating Multiple Namespaces from the Kubernetes Command Line Interface

Question

I want to create multiple namespaces from the Kubernetes CLI (kubectl) without any YAML manifests:

kubectl create namespace app1,app2,app3

Can this be done?

Answer 1

kubectl expects exactly one namespace:

➜  / kubectl create ns
error: exactly one NAME is required, got 0

depending on your shell you could pack it into a loop. here's an example for bash and zsh:

➜  / foreach ns (ns1 ns2 ns3); kubectl create ns $ns; end

Answer 2

You could chain together 2 kubectl commands like so:

kubectl create ns app1 && kubectl create ns app2...