When creating container images to run on OpenShift Container Platform there are a number of best practices to consider as an image author to ensure a good experience for consumers of those images. This script is EOF, OpenShift Container Platform 4.6 release notes, Mirroring images for a disconnected installation, Installing a cluster on AWS with customizations, Installing a cluster on AWS with network customizations, Installing a cluster on AWS in a restricted network, Installing a cluster on AWS into an existing VPC, Installing a cluster on AWS into a government region, Installing a cluster on AWS using CloudFormation templates, Installing a cluster on AWS in a restricted network with user-provisioned infrastructure, Installing a cluster on Azure with customizations, Installing a cluster on Azure with network customizations, Installing a cluster on Azure into an existing VNet, Installing a cluster on Azure into a government region, Installing a cluster on Azure using ARM templates, Installing a cluster on GCP with customizations, Installing a cluster on GCP with network customizations, Installing a cluster on GCP in a restricted network, Installing a cluster on GCP into an existing VPC, Installing a cluster on GCP using Deployment Manager templates, Installing a cluster into a shared VPC on GCP using Deployment Manager templates, Installing a cluster on GCP in a restricted network with user-provisioned infrastructure, Installing a cluster on bare metal with network customizations, Restricted network bare metal installation, Setting up the environment for an OpenShift installation, Installing a cluster on IBM Z and LinuxONE, Installing a cluster on IBM Power Systems, Restricted network IBM Power Systems installation, Installing a cluster on OpenStack with customizations, Installing a cluster on OpenStack with Kuryr, Installing a cluster on OpenStack on your own infrastructure, Installing a cluster on OpenStack with Kuryr on your own infrastructure, Installing a cluster on OpenStack in a restricted network, Uninstalling a cluster on OpenStack from your own infrastructure, Installing a cluster on RHV with customizations, Installing a cluster on RHV with user-provisioned infrastructure, Installing a cluster on vSphere with customizations, Installing a cluster on vSphere with network customizations, Installing a cluster on vSphere with user-provisioned infrastructure, Installing a cluster on vSphere with user-provisioned infrastructure and network customizations, Installing a cluster on vSphere in a restricted network, Installing a cluster on vSphere in a restricted network with user-provisioned infrastructure, Uninstalling a cluster on vSphere that uses installer-provisioned infrastructure, Installing a cluster on VMC with customizations, Installing a cluster on VMC with network customizations, Installing a cluster on VMC in a restricted network, Installing a cluster on VMC with user-provisioned infrastructure, Installing a cluster on VMC with user-provisioned infrastructure and network customizations, Installing a cluster on VMC in a restricted network with user-provisioned infrastructure, Supported installation methods for different platforms, Understanding the OpenShift Update Service, Installing and configuring the OpenShift Update Service, Updating a cluster that includes RHEL compute machines, Showing data collected by remote health monitoring, Using Insights to identify issues with your cluster, Using remote health reporting in a restricted network, Troubleshooting CRI-O container runtime issues, Troubleshooting the Source-to-Image process, Troubleshooting Windows container workload issues, Extending the OpenShift CLI with plug-ins, Configuring custom Helm chart repositories, Knative CLI (kn) for use with OpenShift Serverless, Hardening Red Hat Enterprise Linux CoreOS, Replacing the default ingress certificate, Securing service traffic using service serving certificates, User-provided certificates for the API server, User-provided certificates for default ingress, Monitoring and cluster logging Operator component certificates, Retrieving Compliance Operator raw results, Performing advanced Compliance Operator tasks, Understanding the Custom Resource Definitions, Understanding the File Integrity Operator, Performing advanced File Integrity Operator tasks, Troubleshooting the File Integrity Operator, Allowing JavaScript-based access to the API server from additional hosts, Authentication and authorization overview, Understanding identity provider configuration, Configuring an HTPasswd identity provider, Configuring a basic authentication identity provider, Configuring a request header identity provider, Configuring a GitHub or GitHub Enterprise identity provider, Configuring an OpenID Connect identity provider, Using RBAC to define and apply permissions, Understanding and creating service accounts, Using a service account as an OAuth client, Understanding the Cluster Network Operator, Defining a default network policy for projects, Removing a pod from an additional network, About Single Root I/O Virtualization (SR-IOV) hardware networks, Configuring an SR-IOV Ethernet network attachment, Configuring an SR-IOV InfiniBand network attachment, About the OpenShift SDN default CNI network provider, Configuring an egress firewall for a project, Removing an egress firewall from a project, Considerations for the use of an egress router pod, Deploying an egress router pod in redirect mode, Deploying an egress router pod in HTTP proxy mode, Deploying an egress router pod in DNS proxy mode, Configuring an egress router pod destination list from a config map, About the OVN-Kubernetes network provider, Migrating from the OpenShift SDN cluster network provider, Rolling back to the OpenShift SDN cluster network provider, Configuring ingress cluster traffic using an Ingress Controller, Configuring ingress cluster traffic using a load balancer, Configuring ingress cluster traffic on AWS using a Network Load Balancer, Configuring ingress cluster traffic using a service external IP, Configuring ingress cluster traffic using a NodePort, Associating secondary interfaces metrics to network attachments, Persistent storage using AWS Elastic Block Store, Persistent storage using GCE Persistent Disk, Persistent storage using Red Hat OpenShift Container Storage, AWS Elastic Block Store CSI Driver Operator, Red Hat Virtualization (oVirt) CSI Driver Operator, Image Registry Operator in OpenShift Container Platform, Configuring the registry for AWS user-provisioned infrastructure, Configuring the registry for GCP user-provisioned infrastructure, Configuring the registry for Azure user-provisioned infrastructure, Creating applications from installed Operators, Allowing non-cluster administrators to install Operators, Generating a cluster service version (CSV), Configuring built-in monitoring with Prometheus, Setting up additional trusted certificate authorities for builds, Creating CI/CD solutions for applications using OpenShift Pipelines, Working with Pipelines using the Developer perspective, Using the Cluster Samples Operator with an alternate registry, Using image streams with Kubernetes resources, Triggering updates on image stream changes, Creating applications using the Developer perspective, Viewing application composition using the Topology view, Working with Helm charts using the Developer perspective, Understanding Deployments and DeploymentConfigs, Monitoring project and application metrics using the Developer perspective, Adding compute machines to user-provisioned infrastructure clusters, Adding compute machines to AWS using CloudFormation templates, Automatically scaling pods with the horizontal pod autoscaler, Automatically adjust pod resource levels with the vertical pod autoscaler, Using Device Manager to make devices available to nodes, Including pod priority in pod scheduling decisions, Placing pods on specific nodes using node selectors, Configuring the default scheduler to control pod placement, Placing pods relative to other pods using pod affinity and anti-affinity rules, Controlling pod placement on nodes using node affinity rules, Controlling pod placement using node taints, Controlling pod placement using pod topology spread constraints, Running background tasks on nodes automatically with daemonsets, Viewing and listing the nodes in your cluster, Managing the maximum number of pods per node, Freeing node resources using garbage collection, Allocating specific CPUs for nodes in a cluster, Using Init Containers to perform tasks before a pod is deployed, Allowing containers to consume API objects, Using port forwarding to access applications in a container, Viewing system event information in a cluster, Configuring cluster memory to meet container memory and risk requirements, Configuring your cluster to place pods on overcommited nodes, Using remote worker node at the network edge, Red Hat OpenShift support for Windows Containers overview, Red Hat OpenShift support for Windows Containers release notes, Understanding Windows container workloads, Creating a Windows MachineSet object on AWS, Creating a Windows MachineSet object on Azure, About the Cluster Logging custom resource, Configuring CPU and memory limits for cluster logging components, Using tolerations to control cluster logging pod placement, Moving the cluster logging resources with node selectors, Configuring systemd-journald for cluster logging, Collecting logging data for Red Hat Support, Enabling monitoring for user-defined projects, Exposing custom application metrics for autoscaling, Planning your environment according to object maximums, What huge pages do and how they are consumed by apps, Performance Addon Operator for low latency nodes, Optimizing data plane performance with Intel devices, Overview of backup and restore operations, Installing and configuring OADP with Azure, Recovering from expired control plane certificates, About migrating from OpenShift Container Platform 3 to 4, Differences between OpenShift Container Platform 3 and 4, Installing MTC in a restricted network environment, Migration toolkit for containers overview, Editing kubelet log level verbosity and gathering logs, LocalResourceAccessReview [authorization.openshift.io/v1], LocalSubjectAccessReview [authorization.openshift.io/v1], ResourceAccessReview [authorization.openshift.io/v1], SelfSubjectRulesReview [authorization.openshift.io/v1], SubjectAccessReview [authorization.openshift.io/v1], SubjectRulesReview [authorization.openshift.io/v1], LocalSubjectAccessReview [authorization.k8s.io/v1], SelfSubjectAccessReview [authorization.k8s.io/v1], SelfSubjectRulesReview [authorization.k8s.io/v1], SubjectAccessReview [authorization.k8s.io/v1], ClusterAutoscaler [autoscaling.openshift.io/v1], MachineAutoscaler [autoscaling.openshift.io/v1beta1], HelmChartRepository [helm.openshift.io/v1beta1], ConsoleCLIDownload [console.openshift.io/v1], ConsoleExternalLogLink [console.openshift.io/v1], ConsoleNotification [console.openshift.io/v1], ConsoleYAMLSample [console.openshift.io/v1], CustomResourceDefinition [apiextensions.k8s.io/v1], MutatingWebhookConfiguration [admissionregistration.k8s.io/v1], ValidatingWebhookConfiguration [admissionregistration.k8s.io/v1], ImageStreamImport [image.openshift.io/v1], ImageStreamMapping [image.openshift.io/v1], ContainerRuntimeConfig [machineconfiguration.openshift.io/v1], ControllerConfig [machineconfiguration.openshift.io/v1], KubeletConfig [machineconfiguration.openshift.io/v1], MachineConfigPool [machineconfiguration.openshift.io/v1], MachineConfig [machineconfiguration.openshift.io/v1], MachineHealthCheck [machine.openshift.io/v1beta1], MachineSet [machine.openshift.io/v1beta1], PrometheusRule [monitoring.coreos.com/v1], ServiceMonitor [monitoring.coreos.com/v1], EgressNetworkPolicy [network.openshift.io/v1], IPPool [whereabouts.cni.cncf.io/v1alpha1], NetworkAttachmentDefinition [k8s.cni.cncf.io/v1], OAuthAuthorizeToken [oauth.openshift.io/v1], OAuthClientAuthorization [oauth.openshift.io/v1], Authentication [operator.openshift.io/v1], CloudCredential [operator.openshift.io/v1], ClusterCSIDriver [operator.openshift.io/v1], Config [imageregistry.operator.openshift.io/v1], Config [samples.operator.openshift.io/v1], CSISnapshotController [operator.openshift.io/v1], DNSRecord [ingress.operator.openshift.io/v1], ImageContentSourcePolicy [operator.openshift.io/v1alpha1], ImagePruner [imageregistry.operator.openshift.io/v1], IngressController [operator.openshift.io/v1], KubeControllerManager [operator.openshift.io/v1], KubeStorageVersionMigrator [operator.openshift.io/v1], OpenShiftAPIServer [operator.openshift.io/v1], OpenShiftControllerManager [operator.openshift.io/v1], OperatorPKI [network.operator.openshift.io/v1], CatalogSource [operators.coreos.com/v1alpha1], ClusterServiceVersion [operators.coreos.com/v1alpha1], InstallPlan [operators.coreos.com/v1alpha1], PackageManifest [packages.operators.coreos.com/v1], Subscription [operators.coreos.com/v1alpha1], ClusterRoleBinding [rbac.authorization.k8s.io/v1], ClusterRole [rbac.authorization.k8s.io/v1], RoleBinding [rbac.authorization.k8s.io/v1], ClusterRoleBinding [authorization.openshift.io/v1], ClusterRole [authorization.openshift.io/v1], RoleBindingRestriction [authorization.openshift.io/v1], RoleBinding [authorization.openshift.io/v1], AppliedClusterResourceQuota [quota.openshift.io/v1], ClusterResourceQuota [quota.openshift.io/v1], FlowSchema [flowcontrol.apiserver.k8s.io/v1alpha1], PriorityLevelConfiguration [flowcontrol.apiserver.k8s.io/v1alpha1], CertificateSigningRequest [certificates.k8s.io/v1], CredentialsRequest [cloudcredential.openshift.io/v1], PodSecurityPolicyReview [security.openshift.io/v1], PodSecurityPolicySelfSubjectReview [security.openshift.io/v1], PodSecurityPolicySubjectReview [security.openshift.io/v1], RangeAllocation [security.openshift.io/v1], SecurityContextConstraints [security.openshift.io/v1], StorageVersionMigration [migration.k8s.io/v1alpha1], VolumeSnapshot [snapshot.storage.k8s.io/v1beta1], VolumeSnapshotClass [snapshot.storage.k8s.io/v1beta1], VolumeSnapshotContent [snapshot.storage.k8s.io/v1beta1], BrokerTemplateInstance [template.openshift.io/v1], TemplateInstance [template.openshift.io/v1], UserIdentityMapping [user.openshift.io/v1], Configuring the distributed tracing platform, Configuring distributed tracing data collection, Preparing your cluster for OpenShift Virtualization, Installing OpenShift Virtualization using the web console, Installing OpenShift Virtualization using the CLI, Uninstalling OpenShift Virtualization using the web console, Uninstalling OpenShift Virtualization using the CLI, Additional security privileges granted for kubevirt-controller and virt-launcher, Triggering virtual machine failover by resolving a failed node, Installing the QEMU guest agent on virtual machines, Viewing the QEMU guest agent information for virtual machines, Managing config maps, secrets, and service accounts in virtual machines, Installing VirtIO driver on an existing Windows virtual machine, Installing VirtIO driver on a new Windows virtual machine, Configuring PXE booting for virtual machines, Enabling dedicated resources for a virtual machine, Importing virtual machine images with data volumes, Importing virtual machine images into block storage with data volumes, Importing a Red Hat Virtualization virtual machine, Importing a VMware virtual machine or template, Enabling user permissions to clone data volumes across namespaces, Cloning a virtual machine disk into a new data volume, Cloning a virtual machine by using a data volume template, Cloning a virtual machine disk into a new block storage data volume, Configuring the virtual machine for the default pod network, Attaching a virtual machine to a Linux bridge network, Configuring IP addresses for virtual machines, Configuring an SR-IOV network device for virtual machines, Attaching a virtual machine to an SR-IOV network, Viewing the IP address of NICs on a virtual machine, Using a MAC address pool for virtual machines, Configuring local storage for virtual machines, Configuring CDI to work with namespaces that have a compute resource quota, Uploading local disk images by using the web console, Uploading local disk images by using the virtctl tool, Uploading a local disk image to a block storage data volume, Managing offline virtual machine snapshots, Moving a local virtual machine disk to a different node, Expanding virtual storage by adding blank disk images, Cloning a data volume using smart-cloning, Using container disks with virtual machines, Re-using statically provisioned persistent volumes, Enabling dedicated resources for a virtual machine template, Migrating a virtual machine instance to another node, Monitoring live migration of a virtual machine instance, Cancelling the live migration of a virtual machine instance, Configuring virtual machine eviction strategy, Managing node labeling for obsolete CPU models, Troubleshooting node network configuration, Diagnosing data volumes using events and conditions, Viewing information about virtual machine workloads, OpenShift cluster monitoring, logging, and Telemetry, Collecting OpenShift Virtualization data for Red Hat Support, Installing the OpenShift Serverless Operator, Listing event sources and event source types, Serverless components in the Administrator perspective, Integrating Service Mesh with OpenShift Serverless, Cluster logging with OpenShift Serverless, Configuring JSON Web Token authentication for Knative services, Configuring a custom domain for a Knative service, Setting up OpenShift Serverless Functions, Function project configuration in func.yaml, Accessing secrets and config maps from functions, Using NVIDIA GPU resources with serverless applications, OpenShift Container Platform-specific guidelines, Creating images from source code with source-to-image, Understanding the source-to-image build process, Using OpenShift Container Platform for building the image. Adding the following to your Dockerfile sets the directory and file permissions to allow users in the root group to access them in the built image: Because the container user is always a member of the root group, the container user can read and write these files. but it should exercise the crucial steps of assemble and run scripts. It is also possible and recommended to pass secrets such as certificates and keys into the container using environment variables. Install the artifacts into locations appropriate for them to run. The tags are the way to categorize the container images into broad areas of functionality. CRI-O supports the insertion of arbitrary user IDs into the containers /etc/passwd, so changing permissions is never required. continuous integration. See the Docker custom metadata documentation for details about the format. For extremely complex scenarios, configuration can also be supplied using volumes that would be mounted into the container at runtime. OpenShift Container Platform collects standard out from containers and sends it to the centralized logging service where it can be viewed. Remove all temporary files you create during the build process. Doing so prevents the need for common dependencies to be downloaded during application assembly time, speeding up application image builds. If your image uses such a script, that script uses exec so that the scripts process is replaced by your software. http(s)://path_to_scripts_dir: URL to a directory where the S2I scripts are located. Instead, they can simply define environment variable values when defining a pod and change those settings without rebuilding the image. Then each time you changed myfile and reran podman build or docker build, the ADD operation would invalidate the RUN layer cache, so the yum operation must be rerun as well. Users of your image are able to configure it without having to create a downstream image based on your image. The container builder reads the Dockerfile and runs the instructions from top to bottom. If you want to support incremental builds, make sure to define save-artifacts as well. In particular, provide database drivers for common databases used with your platform. Alternatively, you can allow all images to run as any user. Labels are different from environment variable in that they are not visible to the running application and they can also be used for fast look-up of images and containers. S2I combines the application source code and builder image, so in order to test If your OpenShift Container Platform instance is hosted on a public IP address, the build can The save-artifacts script gathers all dependencies that can speed up the build processes that follow. If you later release an incompatible update, then switch to a new tag, for example foo:v2. Many images use wrapper scripts to do some setup before starting a process for the software being run. Run the image to verify the test application is working. Doing so ensures the next builds of the same image are very fast because the cache is not invalidated by upper layer changes. The UI can warn the user that deploying this container image may exceed their user quota. for use on OpenShift Container Platform. based on the S2I builder image you updated. If required, follow the installation instructions However, if you elect to do it this way you must ensure that your image provides clear error messages on startup when the necessary volume or configuration is not present. be triggered each time you push into your S2I builder image GitHub repository. creating a new S2I image. OpenShift Container Platform allows you to easily colocate and co-manage related images by grouping them into a single pod. S2I requires the The test/run script performs the S2I build, so you must have the S2I binary Signal handling flows are also clearer with a single process as you do not have to manage routing signals to spawned processes. These probes allow users to deploy your image with confidence that traffic is not be routed to the container until it is prepared to handle it, and that the container is restarted if the process gets into an unhealthy state. Because images are intended to be immutable and used as-is, the following guidelines help ensure that your images are highly consumable and easy to use on OpenShift Container Platform. If required, first build the S2I image. This means that the runtime configuration is handled using environment variables. The UI can then use this description together with the container image name to provide more human friendly information to end users. It is very important to place instructions that rarely change at the top of your Dockerfile. This way OpenShift Container Platform mounts the network storage to the node running the container, and if the container moves to a new node the storage is reattached to that node. The workflow for this script is: Optional: Restore build artifacts. This also includes any files added with the ADD command. This topic only defines the metadata needed by the current set of use cases. For example, you can add metadata to provide helpful descriptions of your image, or offer suggestions on other images that may also be needed. This is not necessary because containers are lightweight and can be easily linked together for orchestrating multiple processes. scripts and testing tools along with the Makefile: The generated test/run script must be adjusted to be The test script assumes you have already built the image you want to Tags help UI and generation tools to suggest relevant container images during the application creation process. assemble and run scripts to be present in order to successfully run Makefile. in the For example, if you provide an image named foo and it currently includes version 1.0, you might provide a tag of foo:v1. By using the volume for all persistent storage needs, the content is preserved even if the container is restarted or moved. Update, then switch to a directory where the S2I scripts are located run the image to verify the application! 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