K
Q

Exec commands on kubernetes pods with root access

3/14/2017

I have one pod running with name 'jenkins-app-2843651954-4zqdp'. I want to install few softwares temporarily on this pod. How can I do this?

I am trying this- kubectl exec -it jenkins-app-2843651954-4zqdp -- /bin/bash and then running apt-get install commands but since the user I am accessing with doesn't have sudo access I am not able to run commands

-- biz dev
bash
docker
kubernetes

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4 Answers

3/15/2017
  • Use kubectl describe pod ... to find the node running your Pod and the container ID (docker://...)
  • SSH into the node
  • run docker exec -u root ID -- /bin/bash
-- Janos Lenart
Source: StackOverflow
2/1/2019

There are some plugins for kubectl that may help you achieve this: https://github.com/jordanwilson230/kubectl-plugins

One of the plugins called, 'ssh', will allow you to exec as root user by running (for example) kubectl ssh -u root -p nginx-0

-- jordanwilson230
Source: StackOverflow
8/22/2019
  • docker container ls to find container ID
  • docker exec -it -u root ID /bin/bash
-- MCI
Source: StackOverflow
1/20/2020

For my case, I was in need for root access (or sudo) to container to give the chown permission to a specific mount path.

I cannot SSH to machine because I designed my infrastructure to be fully automated with Terraform without any manual access.

Instead, I found that initContainers does the job:

  initContainers:
    - name: volume-prewarming
      image: busybox
      command: ["sh", "-c", "chown -R 1000:0 {{ .Values.persistence.mountPath }}"]
      volumeMounts:
      - name: {{ .Chart.Name }}
        mountPath: {{ .Values.persistence.mountPath }}

I've also created a whole course about Production grade running kubernetes on AWS using EKS

-- Abdennour TOUMI
Source: StackOverflow