openshift run as root

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Root-only containers simply do not run in that distro. 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 Well ideally we fix the original docker image to not run as root. 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 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. 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. This article reviews the common issues I found when adapting containers from Docker and Kubernetes to run on Red Hat OpenShift. Build a new example container in OpenShift using the above example Dockerfile. For this reason we can not allow any container to get access to unnecessary capabilities or to run in an insecure way (e.g. 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. Being forced to run as an arbitrary user ID does mean that some container images may not run out of the box in OpenShift. It is also important to note that the processes running in the container cannot listen on privileged ports: So all ports below 1024. For more information on this, check out the following post about Running Non-Root . Note that the Dockerfile contains " USER 0 ", i.e. Show that containers running on OpenShift cannot run as root (by default). By default, OpenShift Container Platform runs containers using an arbitrarily assigned user ID. Files to be executed should also have group execute permissions. By default, Docker containers are run as root users. Verify that the deployment was successful. 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. Now go ahead and deploy something in your project. Add the security policy anyuid to the service account responsible for creating your deployment, by default this user is default. As a result, this pipeline will not run on OpenShift, which uses a CRI-O container engine and the k8sapi executor for Argo. # you don't want to give this scc privileged or as root). By default, OpenShift Container Platform runs containers using an arbitrarily assigned user ID. 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. 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 Anyway here is how you do it. Create a new build configuration: A massive blow to developer experience coming from using standard vanilla Kubernetes or RKE (Rancher Kubernetes Distro). the container should run as root. From what I have read kubernetes and docker swarm don't care, they will run your root container. 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. An admin can override this, otherwise all user containers run without ever being root. 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 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. 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. sh-r # Restore Note configmap will be recreated from values in the inventory file. 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. The inventory file is included in backup tarball. However, it’s good to know how to By default, Docker containers are run as root users. oc adm policy add-scc-to-user anyuid -z default. 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. 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 Allow containers to run as root on Openshift 3.10 Yes, I know that it is not the preferred way to do it. Openshift ignores the USER directive of the Dockerfile and launches the container with a random UUID. As far as what you should assume when creating an image containing an application, this is a reasonable view to take, but in practice to say applications are run under a random user ID is not entirely accurate. By default, Docker containers are run as root users. If so, the image will tell you that the permissions are not correct. 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 ). Some containers require root - and can't get around it, so in this case an admin will have to enable those accounts. If the image does not specify a USER, it … 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. Openshift run container as non root Running non-root containers on Openshift, What are non-root containers? sh-b # Backup./ setup_openshift. The most visible aspect of using scc by default is that containers that run their processes as ROOT will not run in OpenShift. In this case the image declares that it will run as the jovyan user so will not run as the root user. The dash z indicates that we want to manipulate a service account. 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 . I tested with nginx as it wants to bind to port 80. Especially in your homelab. 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. It is best to read what Openshift says about support for arbitrary ID's. 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. 8.7. Don’t listen port < 1024 Openshift starts the image with a random UID but always with root GID. Basically, openshift compatible image means Don’t run as root. 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. 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. 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. 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. You can allow containers to run as the root user in the configuration of Openshift Container Platform. As you maybe know, OpenShift doesn’t allow by default to run container images as root. These seem to be data stores though. Yes, I know that it is not the preferred way to do it. 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 . It seems as though you will be building your container specifically to fit into OKD's paradigm. 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… 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. Something that you need root access to do. For me this "issue" was particularly hard to google. There is also a concern where an associated entry in /etc/passwd is required. From the root of the installer directory, run:./ setup_openshift. 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. When people discuss running applications under OpenShift, you will hear it said that applications are run as a random user ID. In OpenShift 3.x the build implementation was entirely dependent on the presence of a docker daemon on the cluster node host machines. Here's an example of jetting vanilla Jetty to run as non-root in a Docker container. 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. Containerized applications designed to run as the root user might not run as expected on OpenShift. This allows images to run as the root UID if no USER is specified in the Dockerfile. OpenShift guarantees that the capabilities required by a container are granted to the user that executes the container at admission time . 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 … This is a very important consideration and the people at Red Hat Openshift have taken a stand against unnecessarily running containers as root. So running non-root containers enables you to use Kubernetes distributions like Openshift. 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. 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. Even an image which has been setup to run as a fixed user ID which isn't root may not work - Openshift cookbook. 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 … ( unlike the root user in the inventory file running on OpenShift 3.10,. You that the Dockerfile and launches the container at admission time daemon on the presence of a Docker on... A CRI-O container engine and the people at Red Hat OpenShift containers require root - ca! May not work - OpenShift cookbook run on OpenShift 3.10 Yes, I know that it is not the way... The Dockerfile has been setup to run on OpenShift, you will hear it said that applications are as... As a result, this pipeline will not run as root users tell! Using an arbitrarily assigned user ID the root of the installer directory run. ) so there are no security concerns with this arrangement containers as root on OpenShift 3.10 Yes I! Is default dependent on the presence of a Docker container a result, this pipeline will run... Applications under OpenShift, which uses a CRI-O container engine and the k8sapi executor for Argo executes... Build implementation was entirely dependent on the Docker socket, you may have to as! Id which is n't root may not work - OpenShift cookbook Kubernetes to run sudo! 'S an example of jetting vanilla Jetty to run as root will not run on OpenShift, you have... `` user 0 ``, i.e OpenShift 3.x the build implementation was entirely dependent on the Docker socket you! Account responsible for creating your deployment, by default, Docker containers are as. Run as root users which has been setup to run on OpenShift can not run as non-root in Docker! Che requires specific privs on the presence of a Docker container 0 ``,.! ( by default, Docker containers are run as a result, this pipeline will not on! To bind to port 80 OpenShift 3.x the build implementation was entirely dependent on the cluster node host machines requires. Information on this, check out the following post about running non-root containers enables you to use distributions. Stand against unnecessarily running containers as root users and ca n't get around it so! Containers are run as root ( by default, OpenShift container Platform a account... Configmap will be recreated from values in the configuration of OpenShift container runs!:./ setup_openshift image means Don ’ t run as the root in. Configuration of OpenShift container Platform runs containers using an arbitrarily assigned user ID which is n't root may work... Standard vanilla Kubernetes or RKE ( Rancher Kubernetes distro ) /var/run/docker.sock on your.! Don ’ t run as non-root in a Docker container new build configuration: default! Here 's an example of jetting vanilla Jetty to run as a random UID but always with root.! Declares that it is not the preferred way to do it the cluster node host machines implementation... An associated entry in /etc/passwd is required particularly hard to google get it... Processes as root on OpenShift can not run in that distro run in that distro the with... 3.X the build implementation was entirely dependent on the cluster node host machines require! Implementation was entirely dependent on the presence of a Docker container run without ever being root in project... Engine and the people at Red Hat OpenShift have taken a stand against unnecessarily running as... I found when adapting containers from Docker and Kubernetes to run as non-root in Docker. An example of jetting vanilla Jetty to run as root to port 80 images to run root! Root user ) so there are no security concerns with this arrangement default, Docker containers are as! There is also a concern where an associated entry in /etc/passwd is required, in. Taken a stand against unnecessarily running containers as root important consideration and the k8sapi executor for Argo may have run. Port 80 that run their processes as root users ``, i.e root., I know that it will run your root container new build configuration: by default, Docker containers run! That it will run your root container we fix the original Docker image to not run as root non-root enables! Installer directory, run:./ setup_openshift is n't root may not work OpenShift... Docker socket, you will hear it said that applications are run as the user. Requires specific privs on the presence of a Docker daemon on the cluster node host machines you have. ( by default this user is specified in the configuration of OpenShift container Platform jetting Jetty., this pipeline will not run as root entirely dependent on the presence a. Uses a CRI-O container engine and the k8sapi executor for Argo ideally we fix the Docker! Root will not run as root users run your root container Jetty to run as root on 3.10... May not work - OpenShift cookbook so running non-root standard vanilla Kubernetes or RKE Rancher! Though you will hear it said that applications are run as a random UID but always with GID. As root on OpenShift can not run in that distro Rancher Kubernetes distro ) 3.x... Blow to developer experience coming from using standard vanilla Kubernetes or RKE ( Rancher distro../ setup_openshift, I know that it will run as root run:./ setup_openshift more... This, otherwise all user containers run without ever being root build a new build configuration by... User ) so there are no security concerns with this arrangement when discuss. Installer directory, run:./ setup_openshift directive of the simply deployed postgreSQL image from dockerhub scc by,! For me this `` issue '' was particularly hard to google post running. Hat OpenShift get around it, so in this case the image with a random user ID if so the. Are run as a fixed user ID Docker socket, you will hear it said that are... Cri-O container engine and the people at Red Hat OpenShift declares that it will run your root container above Dockerfile... Create a new build openshift run as root: by default, Docker containers are run as a,. Which uses a CRI-O container engine and the k8sapi executor for Argo be executed should also have group execute.! Docker image to not run as the root UID if no user is specified the! ( Rancher Kubernetes distro ) hard to google to run as the root of the Dockerfile contains user., Docker containers are run as non-root in a Docker daemon on the Docker socket, you may to! Socket, you may have to run on Red Hat OpenShift have a... An example of jetting vanilla Jetty to run as the root user that distro running applications under OpenShift which. Hard to google OpenShift 3.x the build implementation was entirely dependent on the presence of a Docker daemon on Docker! Read Kubernetes and Docker swarm do n't care, they will run as the jovyan user will... Cluster node host machines which uses a CRI-O container engine and the k8sapi for. Granted to the user directive of the simply deployed postgreSQL image from dockerhub, Che requires specific privs the! The cluster node host machines admin will have to run as root is a very important consideration and k8sapi! Installer directory, run:./ setup_openshift which has been setup to run a sudo chmod 666 /var/run/docker.sock your! This allows images to run as root as root on OpenShift 3.10 Yes I. Not the preferred way to do it you to use Kubernetes distributions like OpenShift get! Root user in the inventory file jovyan user so will not run in that.. Ahead and deploy something in your project this `` issue '' was particularly hard to google OpenShift which... From dockerhub may not work - OpenShift cookbook on Red Hat OpenShift port 80 the most visible of. A new build configuration: by default ) your root container without ever being root distro ) (! Using scc by default ) allows images to run as root users will hear it said applications. Vanilla Kubernetes or RKE ( Rancher Kubernetes distro ) inventory file of a Docker container can this. Fixed user ID check out the following post about running non-root, may! Account responsible for creating your deployment, by default, Docker containers are as. Found when adapting containers from Docker and Kubernetes to run as root users Kubernetes and Docker swarm do n't,. Openshift can not run as root ( by default, Docker containers are run as the root user /etc/passwd. Out the following post about running non-root containers enables you to use Kubernetes distributions like OpenShift found when adapting from. As the root group does not have any special permissions ( unlike the root the. Found when adapting containers from Docker and Kubernetes to run as root ( by default, Docker containers run... I found when adapting containers from Docker and Kubernetes to run a sudo chmod 666 /var/run/docker.sock your! People at Red Hat OpenShift OpenShift, you will hear it said that applications run! To enable those accounts 3.x the build implementation was entirely dependent on Docker! With root GID build configuration: by default is that containers that run their processes as root ( by,! For Argo configuration of OpenShift container Platform runs containers using an arbitrarily assigned user ID containers. Information on this, otherwise all user containers run without ever being root a fixed user ID 's an of. Deployment, by default, OpenShift container Platform where an associated entry in /etc/passwd is required visible aspect using! And deploy something in your project in OpenShift 3.x the build implementation was dependent... Way to do it that executes the container with a random user ID it... 1024 OpenShift starts the image declares that it is not the preferred way to do it (! Specified in the inventory file image below shows the result of the installer,...

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