kubectl attach: Unable to use a TTY - container es

问题:

I am trying to attach to a running container in Kubernetes, however I get the error message below.

>kubectl attach -it es-client-2756725635-4rk43 -c es-node
Unable to use a TTY - container es-node did not allocate one
If you don't see a command prompt, try pressing enter.

How do I enable a TTY in my container yaml?

回答1:

In order to have proper TTY and stdin when doing attach:

kubectl attach -it POD -c CONTAINER

The container must be configured with tty: true and stdin: true. By default both of those values are false: https://kubernetes.io/docs/api-reference/v1.5/#container-v1

Example Pod:

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

回答2:

The reason why it's failiing is because you're not passing the bash argument. This causes a failure when trying to create a tty connection.

Please try:

kubectl exec -it [POD-NAME] -c [CONTAINER-NAME] bash

回答3:

For Windows, MINGW64 (git bash) does not seem to work, but PowerShell does!

kubectl exec -it abc-deployment-5d64659ff8-8tnnb -- /bin/bash
root@abc-deployment-5d64659ff8-8tnnb:/#

回答4:

Whatever I did, it didn't work, tty command would always return not a tty response and exit non-0, i.e. nothing that require tty would work on my terminal.

I'm making an ephemeral workstation with persistent disk as my $HOME with Ubuntu Bionic Beaver on GKE.

Since I had brew installed in my PD mounted $HOME and brew was in my $PATH, following worked for me:

brew install tmux
tmux new -d -s <some arbitrary session name here> ### i.e.> tmux new -d -s tty
tmux ls # Lists your sessions
tmux a  # Attach to first available session

Then inside tmux:
$ tty
Voila
/dev/pts/0

My agnoster is b0rkz but now I can do stuff that prompts for interactive password entry, i.e. gcloud auth.

PS: For those curious, I mounted /etc/shadow, /etc/group, /etc/passwd into /etc with configmap

回答5:

you can add a shell container ,like this. then you can use

kubectl attach -it nginx -c shell

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  shareProcessNamespace: true
  containers:
  - name: nginx
    image: nginx
  - name: shell
    image: busybox
    stdin: true
    tty: true