kubectl attach

 Unable to use a TTY - container your-container did not allocate one

kubectl attach my-pod -i
https://kubernetes.io/docs/reference/kubectl/cheatsheet/#updating-resources

spec:
    containers:
    - name: your-name
      image: your-name:latest
      tty: true
      stdin: true

kubectl exec

See also

• kubectl: [ cp | config | create | delete | edit | explain | apply | exec | get | set | drain | uncordon | rolling-update | rollout | logs | run | auth | label | annotate | version | top | diff | debug | replace | describe | port-forward | proxy | scale | rollout | api-resources | expose deployment | expose | patch | attach | get endpoints | ~/.kube/config | kubectl logs --help | kubectl --help, kubectl-convert, kubectl autoscale, kubectl.kubernetes.io