It looks like docker exec is being used as the backend for kubectl exec. There is no sudo or similar in the image, and the doc advise to use docker exec -u 33 when in a Docker environment. I am using google cloud. It's not them. or mute the thread The Cookies collected are used only to Show customized Ads. I thought su -l didn't copy env vars? Another usecase for this is manually executing scripts in containers. I was able to solve it by using the exec-as plugin. The syntax is a little self-explanatory, we will see more examples so that you would understand this even better. 1) find out what node it is running on kubectl get po -n [NAMESPACE] -o wide, 3) find the docker container sudo docker ps | grep [namespace], 4) log into container as root sudo docker exec -it -u root [DOCKER ID] /bin/bash. If you have any questions, please feel free to reach out directly. However, you can do it by using docker exec with the additional option: --user , -u Username or UID (format: <name|uid> [:<group|gid>]) Installing stuff for debugging purposes is my use case as well. The default output format for all kubectl commands is the human readable plain-text format. error on Kubernetes. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Let's suppose you want to pass some complicated commands like ls -lrt |awk '{print $9}' that time this would be really helpful. Hi Abdennour. For example, Actually there is already a possibility to connect via kubectl addon kubectl-plugins. Successfully merging a pull request may close this issue. Exec commands on kubernetes pods with root access, https://github.com/jordanwilson230/kubectl-plugins, github.com/jordanwilson230/kubectl-plugins/issues/40, https://github.com/jordanwilson230/kubectl-plugins/blob/krew/kubectl-exec-as, Production grade running kubernetes on AWS using EKS, How a top-ranked engineering school reimagined CS curriculum (Ep. Automatically scale the set of pods that are managed by a replication controller. If it comes back and says that your uid and gid are 1000, you're done! Display endpoint information about the master and services in the cluster. kubectl client it's distributed as a binary file so depending on your host you might give exec access to all users by doing chmod +x /usr/local/bin/kubectl or you can add a custom rule to your /etc/sudoers by using visudo your_user ALL = NOPASSWD: /usr/local/bin/kubectl your user will be able to run kubectl like this sudo kubectl . What is the symbol (which looks similar to an equals sign) called? suppose you have a Pod named my-pod, and the Pod has two containers To print information about the status of a pod, use a command like the following: To output objects to a sorted list in your terminal window, you can add the --sort-by flag to a supported kubectl command. By default kubectl will first determine if it is running within a pod, and thus in a cluster. you need to mention which container, the command should be executed using -c. Note*: In a multi container pod, if you are not mentioning the desired container name, the first container would be taken by default. You can get this with kubectl get nodes -o wide. Here are some examples: If a Pod has more than one container, use --container or -c to This only works in Kubernetes clusters which allow priviledged containers. If you have a specific, answerable question about how to use Kubernetes, ask it on In case anyone is working on AKS, follow these steps: Once you are inside a node, perform these commands to get into the container: In k8s deployment configuration, you can set to run the container as root. If total energies differ across different software, how do I decide which software to use? Made with in SYDNEY 2020-2022 Sukanta Maikap. you can specify the singular, plural, or abbreviated forms. I was wrong about that, because your injected debug container shares the process namespace with your target container, you can access the filesystem of any process in the target container from your debug container. -it tells exec to redirect the shell's input and output streams back to the controlling shell. Find centralized, trusted content and collaborate around the technologies you use most. Why xargs does not process the last argument? What are the advantages of running a power tool on 240 V vs 120 V? Find centralized, trusted content and collaborate around the technologies you use most. This solution does not work for remote cluster. I added KUBECONFIG for the root user and it is working fine now. But this is not ideal. (since k8s 1.21 uses cri-o as container runtime). In short, this suggestion does not solve my problem at all. When a gnoll vampire assumes its hyena form, do its HP change? First, inspect the pod in question to get the docker container you want to connect to. And, many times, you wont have access to the underlying Dockerfile to make the necessary changes. For example, if the variable is set to seattle, kubectl get pods would return pods in the seattle namespace. Review the output of kubectl api-resources to determine if a resource is namespaced. Anyone willing to push this forward would have to address the security implications Clayton mentions. please do let us know on the comments section. Share For those on Windows Platform using minikube. Working with kubernetes 1.21, none of the docker and kubectl-plugin approaches worked for me. Asking for help, clarification, or responding to other answers. Do they even work with exec? Before you begin crictl requires a Linux operating system with a CRI runtime. Unlike the Ansible command module, Ansible Shell would accept any highly complexed commands with pipes, redirection etc and you can also execute Shell scripts using Ansible Shell module. By default when you execute the following command, you get root privileges. kubernetes env vars are missing. On Tue, Oct 11, 2016 at 5:26 PM, Michael Elsdrfer How to Install Kubernetes on Rocky Linux {Manual or via Ansible}
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