This post is also available in: 日本語 (Japanese)On May 31th, the Kubernetes Product Security Committee announced a security regression in Kubernetes for which they had assigned CVE-2019-11245. This article reviews the common issues I found when adapting containers from Docker and Kubernetes to run on Red Hat OpenShift. So to get it working you do the following to the directory being written to: Remember we are talking root group not root user. By default, Docker containers are run as root users. Yes, I know that it is not the preferred way to do it. This allows OpenShift Enterprise to validate the authority the image is attempting to run with and prevent running images that are trying to run as root, because running containers as a privileged user exposes potential security holes. If an image can't be modified, you can elect to override the default security configuration of OpenShift and have it run as the user the image specifies, but this can only be done by an administrator of the OpenShift cluster. Anyway here is how you do it. privileged or as root). There is also a concern where an associated entry in /etc/passwd is required. oc adm policy add-scc-to-user anyuid -z default. Containerized applications designed to run as the root user might not run as expected on OpenShift. This means that you can do whatever you want in your container, such as install system packages, edit configuration files, bind privilege ports, adjust permissions, create And although Bitnami has an excellent plethora of images running as non root users there will always be some cases where you want to run a container as root. Note that the Dockerfile contains " USER 0 ", i.e. Enable Container Images that Require Root Some container images (examples: postgres and redis ) require root access and have certain expectations about how volumes are owned. In this case the image declares that it will run as the jovyan user so will not run as the root user. Openshift ignores the USER directive of the Dockerfile and launches the container with a random UUID. From the root of the installer directory, run:./ setup_openshift. Show that containers running on OpenShift cannot run as root (by default). This is because saying a random user ID is used, can give the impression that each time an application is re-started, or where multiple replicas are run, that it is assigned a differ… Also, Che requires specific privs on the docker socket, you may have to run a sudo chmod 666 /var/run/docker.sock on your host. It’s possible to enable images to run as root on OpenShift, that’s documented in the OpenShift documentation here, by adding a service account. OpenShift guarantees that the capabilities required by a container are granted to the user that executes the container at admission time . This allows OpenShift Container Platform to validate the authority the image is attempting to run with and prevent running images that are trying to run as root, because running containers as a privileged user exposes potential security holes. This allows images to run as the root UID if no USER is specified in the Dockerfile. The image below shows the result of the simply deployed postgreSQL image from dockerhub. When people discuss running applications under OpenShift, you will hear it said that applications are run as a random user ID. Verify that the deployment was successful. This is a very important consideration and the people at Red Hat Openshift have taken a stand against unnecessarily running containers as root. Being forced to run as an arbitrary user ID does mean that some container images may not run out of the box in OpenShift. Create a new build configuration: For more information on this, check out the following post about Running Non-Root . # you don't want to give this scc Openshift run container as non root Running non-root containers on Openshift, What are non-root containers? Allow containers to run as root on Openshift 3.10 Yes, I know that it is not the preferred way to do it. By default, Docker containers are run as root users. If the image does not specify a USER, it … If this is not possible then we can tell OpenShift to allow this project to run as root using the below command to change the security context constraints (see manual for these here): # oadm policy add-scc-to-user anyuid -z default It is best to read what Openshift says about support for arbitrary ID's. Now go ahead and deploy something in your project. The root group does not have any special permissions (unlike the root user) so there are no security concerns with this arrangement. sh-r # Restore Note configmap will be recreated from values in the inventory file. RUN useradd -g root -m -s /bin/bash -l -o -u 1099990000 nginx Method 2: Modify the User's UID at Runtime Similar to the process detailed above, this process modifies the named user to use the UID provided by your OpenShift project. So running non-root containers enables you to use Kubernetes distributions like Openshift. Root-only containers simply do not run in that distro. Add the security policy anyuid to the service account responsible for creating your deployment, by default this user is default. By default, OpenShift Container Platform runs containers using an arbitrarily assigned user ID. The most visible aspect of using scc by default is that containers that run their processes as ROOT will not run in OpenShift. OpenShift is Red Hat's container platform, built on Kubernetes, Red Hat Enterprise Linux, and OCI containers, and it has a great security feature: By default, no containers are allowed to run as root. Well ideally we fix the original docker image to not run as root. It is also important to note that the processes running in the container cannot listen on privileged ports: So all ports below 1024. the container should run as root. Even an image which has been setup to run as a fixed user ID which isn't root may not work - Openshift cookbook. This will be the case where images do not adopt security best practices and need to be run as the root user ID even though they have no actual requirement to run as root . Don’t listen port < 1024 Openshift starts the image with a random UID but always with root GID. Enable Dockerhub Images that Require Root Some Dockerhub images (examples: postgres and redis ) require root access and have certain expectations about how volumes are owned. Some containers require root - and can't get around it, so in this case an admin will have to enable those accounts. The inventory file is included in backup tarball. If enabling the ability for a user to run images as any user ID, an administrator should first ensure that the user is trusted, and that . Here's an example of jetting vanilla Jetty to run as non-root in a Docker container. This means that you can do whatever you want in your container, such as install system packages, edit configuration files, bind privilege ports, adjust permissions, create system users and groups, access networking information. Basically, openshift compatible image means Don’t run as root. This allows images to run as the root UID if no USER is specified in the Dockerfile. By default, Docker containers are run as root users. An admin can override this, otherwise all user containers run without ever being root. And although Bitnami has an excellent plethora of images running as non root users there will always be some cases where you want to run a container as root. So you have setup OpenShift Container Platform and try to deploy your first image, dockerhub's nginx image and what do we get...an error: The reality is that you are being forced to run as an arbitrary user ID and that means that some container images may not run out of the box in OpenShift, This will be the case where images do not adopt security best practices and need to be run as the root user ID even though they have no actual requirement to run as root. Openshift says about support for arbitrary ID's, Karma Computing: Building Non-root Docker images for Openshift, Bitnami: Running Non-root Containers in OpenShift, Non-root containers advantages and disadvantages. 8.7. Unfortunetly, we can't simply use the official docker hub jetty image as it begins as root by default (even though it eventually drops to non-root Lastly, the final USER declaration in the Dockerfile should specify the user ID (numeric value) and not the user name, If the image does not specify a USER, it inherits the USER from the parent image. However, it’s good to know how to Running Containers to Run as Root in Minishift It is not recommended to run containers as root in Minishift because for security reasons OpenShift doesn’t support running containers as root. You can allow containers to run as the root user in the configuration of Openshift Container Platform. After this, the operator successfully run as root: [root@k8s-node1 ~]# docker exec -ti 4dd1b072b67f bash groups: cannot find name for group ID 1000310000 root@rook-operator-3874973114-9vqld:/# root@rook-operator-3874973114 sh-b # Backup./ setup_openshift. For an image to support running as an arbitrary user, directories and files that may be written to by processes in the image should be owned by the root group and be read/writable by that group. Also, note that the container image that is used for each step requires root permissions, so we had to give root privileges to the service account running the workflow ( oc adm policy add-role-to-user admin system:serviceaccount:namespace:default-editor ). A massive blow to developer experience coming from using standard vanilla Kubernetes or RKE (Rancher Kubernetes Distro). 最初にOpenShiftのバージョンを確認する。 OpenShiftのバージョンは、v3の最新バージョンである事が読み取れる。 それから、ocコマンドと一緒にkubectlコマンドもインストールされるが、これまでのIKSクラスタを利用してきた関係で、kubectl コマンドもインストールしてありパスが先にある。そこで、kubectlコマンドでもバージョンを確認してみる。kubectlコマンドは、IKSの実行時点のデフォルトバージョン v1.14 であり、OpenShift のマスターノードは、Kubernetes v1.11 である。つまり、kubectl … Something that you need root access to do. For the two most common build strategies (source-to-image and Dockerfile), the creation of the new image and the pushing of it to the target image registry was managed through interaction with the docker daemon. It seems as though you will be building your container specifically to fit into OKD's paradigm. The dash z indicates that we want to manipulate a service account. For an image to support running as an arbitrary user, directories and files that may be written to by processes in the image should be owned by the root group and be read/writable by that group. Check this Example Dockerfile to build your image. These seem to be data stores though. In OpenShift 3.x the build implementation was entirely dependent on the presence of a docker daemon on the cluster node host machines. As a result, this pipeline will not run on OpenShift, which uses a CRI-O container engine and the k8sapi executor for Argo. This avoids the risks associated with having to run an application as the root user ID, or other fixed user ID which may be shared with applications in other projects. Especially in your homelab. はじめに OpenShiftの環境では、Dockerイメージからコンテナを起動する際に（主にセキュリティ上の理由から）いくつかの制限がかけられるため、一定のお作法に従ってイメージを作成しておく必要があります。ここでは、そのようなイメージを作成して、OpenShiftの環境で実行する手順を紹 … From what I have read kubernetes and docker swarm don't care, they will run your root container. How to run privileged pods with root user in a custom scc in OpenShift 3.X Solution Verified - Updated 2020-03-25T19:04:10+00:00 - English If so, the image will tell you that the permissions are not correct. Files to be executed should also have group execute permissions. For me this "issue" was particularly hard to google. I tested with nginx as it wants to bind to port 80. 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