In this post, well cover copying files into a new persistent volume. claim with the given name in the same namespace as the pod, then uses the claim Persistent Volume Claim Object Definition, Example 1. developer (OpenShift user) can claim space from a persistent volume specific to a project PVCs are requests for PVs and also act as claim checks to the resources claiming more storage than the PV provides, results in failure VMDK Since we are dealing with virtual disk, VMware provides several disk types: The copy-files-to-volume Init container copies files that are in /opt/app-root in the S2I builder image onto the Persistent Volume. If such a PV with that name exists and is Available, the PV and To copy a directory to a local machine, the form of the command you need to run is: oc rsync :/remote/dir ./local/dir. Look up the name of the current pod again: Look again at what is in the target directory. To confirm what directory the file is located in, inside of the container, run: To exit the interactive shell and return to the local machine, run: To copy files from the container to the local machine, you can use the oc rsync command. A long-term solution for limiting who can claim a volume is in To copy the complete contents of a directory to the htdocs directory in the container, you could run: oc rsync images blog-1-9j3p3:/opt/app-root/src/htdocs --no-perms. PersistentVolume objects from sources such as GCE Persistent Disk, AWS My solution is unsupported by Red Hat and it is not recommended for production use, but rather, is just to have a customizable solution in case the others doesn't fit you for any reason.You can reach other interesting solutions, based in an operator approach, in the OperatorHub.io like the etcd, whose operator is responsible for installing, backing up and restoring an etcd cluster (between many other cool features). To learn more, see our tips on writing great answers. extract the files. To try it and our other tutorials without needing to install OpenShift, visit the OpenShift Learning Portal. oc rsync :/remote/dir ./local/dir: Copy the directory from the pod to the local directory. Part one: Manually Copying Files This means that, although the files can be added to the directory, permissions on existing directories cannot be changed. Before starting, make sure that you're logged into your OpenShift cluster through the terminal and have created a project. You have a few options. You can find a summary of the key commands covered below. This allows the claim to be used as a volume in a pod. namespace no longer exists. Why must a product of symmetric random variables be symmetric? Note that this solution addresses only backing up and migrating user volumes, not Kubernetes control plane data and configuration, such as etcd. NFS, In this post, you've learned about oc commands that you can use to transfer files to and from a running container. In this post, well cover manually copying files into and out of a container. There you are: A tool to backup, migrate, or clone your PVs inside an OpenShift Kubernetes cluster! Edit /etc/origin/master/master-config.yaml and add the following: ValidatingAdmissionWebhook:configuration:apiVersion: v1disable: falsekind: DefaultAdmissionConfig. The openshift cluster install for 3.11 will ensure that credentials are provided and subsequently available on the nodes in the cluster to facilitate image pulling. You can find a summary of the key commands covered below. oc rsync ./local/dir :/remote/dir --strategy=tar: Copy the directory to the remote directory in the pod. Security: As a basic means of reducing the exposed surface, we avoided anything that relied on Kubernetes NodePorts or privileged pods. Undo working copy modifications of one file in Git? are not in the local directory. If you are mounting a persistent volume into the container for your application and you need to copy files into it, then oc rsync can be used in the same way as described previously to upload files. Dot product of vector with camera's local positive x-axis? oc rsync :/remote/dir/. As the templates are responsible for creating the ServiceAccount and assigning our custom ClusterRole to that ServiceAccount, you dont need extra commands to start the backup process (this does not change from what we have seen before, in the Backup point). GCE You can see the name of the pods corresponding to the running containers for this application by running: You only have one instance of the application, so only one pod will be listed, looking something like this: For subsequent commands which need to interact with that pod, you'll need to use the name of the pod as an argument. only sends files that are different between the source and the destination. You'll be using just the oc command line tool. To demonstrate transferring files to and from a running container, we first need to deploy an application. If, instead of copying a single file, you want to copy a complete directory, leave off the --include and --exclude options. You can request storage by creating PersistentVolumeClaim objects in your pv.kubernetes.io/bound-by-controller annotation. The following YAML can be used to create a persistent volume claim 5 GB in size with ReadWriteMany access, using the built-in storage class. If you want to learn more or refresh your knowledge about persistent storage, check out the Persistent Storage topic in the OpenShift documentation. To see more information on each oc command, run it with the --help option. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. From within the interactive shell, see what files exist in the application directory. Become a Red Hat partner and get support in building customer solutions. Charlotte Ellett. Set the spec.nodeName of the BackupEr pod to the desired OCP node. We're using the Apache HTTPD server purely as a means of keeping the pod running. Persistent Volume Claim Object Definition with volumeName, Persistent Volume Object Definition with claimRef, OpenShift Container Platform 3.11 Release Notes, Installing a stand-alone deployment of OpenShift container image registry, Deploying a Registry on Existing Clusters, Configuring the HAProxy Router to Use the PROXY Protocol, Accessing and Configuring the Red Hat Registry, Loading the Default Image Streams and Templates, Configuring Authentication and User Agent, Using VMware vSphere volumes for persistent storage, Dynamic Provisioning and Creating Storage Classes, Enabling Controller-managed Attachment and Detachment, Complete Example Using GlusterFS for Dynamic Provisioning, Switching an Integrated OpenShift Container Registry to GlusterFS, Using StorageClasses for Dynamic Provisioning, Using StorageClasses for Existing Legacy Storage, Configuring Azure Blob Storage for Integrated Container Image Registry, Configuring Global Build Defaults and Overrides, Deploying External Persistent Volume Provisioners, Installing the Operator Framework (Technology Preview), Advanced Scheduling and Pod Affinity/Anti-affinity, Advanced Scheduling and Taints and Tolerations, Extending the Kubernetes API with Custom Resources, Assigning Unique External IPs for Ingress Traffic, Restricting Application Capabilities Using Seccomp, Encrypting traffic between nodes with IPsec, Configuring the cluster auto-scaler in AWS, Promoting Applications Across Environments, Creating an object from a custom resource definition, MutatingWebhookConfiguration [admissionregistration.k8s.io/v1beta1], ValidatingWebhookConfiguration [admissionregistration.k8s.io/v1beta1], LocalSubjectAccessReview [authorization.k8s.io/v1], SelfSubjectAccessReview [authorization.k8s.io/v1], SelfSubjectRulesReview [authorization.k8s.io/v1], SubjectAccessReview [authorization.k8s.io/v1], ClusterRoleBinding [authorization.openshift.io/v1], ClusterRole [authorization.openshift.io/v1], LocalResourceAccessReview [authorization.openshift.io/v1], LocalSubjectAccessReview [authorization.openshift.io/v1], ResourceAccessReview [authorization.openshift.io/v1], RoleBindingRestriction [authorization.openshift.io/v1], RoleBinding [authorization.openshift.io/v1], SelfSubjectRulesReview [authorization.openshift.io/v1], SubjectAccessReview [authorization.openshift.io/v1], SubjectRulesReview [authorization.openshift.io/v1], CertificateSigningRequest [certificates.k8s.io/v1beta1], ImageStreamImport [image.openshift.io/v1], ImageStreamMapping [image.openshift.io/v1], EgressNetworkPolicy [network.openshift.io/v1], OAuthAuthorizeToken [oauth.openshift.io/v1], OAuthClientAuthorization [oauth.openshift.io/v1], AppliedClusterResourceQuota [quota.openshift.io/v1], ClusterResourceQuota [quota.openshift.io/v1], ClusterRoleBinding [rbac.authorization.k8s.io/v1], ClusterRole [rbac.authorization.k8s.io/v1], RoleBinding [rbac.authorization.k8s.io/v1], PriorityClass [scheduling.k8s.io/v1beta1], 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], VolumeAttachment [storage.k8s.io/v1beta1], BrokerTemplateInstance [template.openshift.io/v1], TemplateInstance [template.openshift.io/v1], UserIdentityMapping [user.openshift.io/v1], Container-native Virtualization Installation, Container-native Virtualization Users Guide, Container-native Virtualization Release Notes. To copy a local directory to a pod directory: To copy a pod directory to a local directory: The oc rsync command exposes fewer command line options than standard rsync. To copy a single file from the container to the local machine, the form of the command you need to run is: oc rsync :/remote/dir/filename ./local/dir. The first is the application layer. File Storage. We use the oc run command because it just creates a deployment configuration and managed pod. You can tell whether a claim or volume is bound by querying using the CLI: A PersistentVolumeClaim is used by a pod as a volume. BackupEr also has its own PVC. In the next sections, I will demonstrate the usefulness of OpenShift's persistent volume framework by deploying a MySQL database, first without and then with persistent volume storage. To copy files from the local machine to the container, we'll again use the oc rsync command. Even though NFS's root_squash maps root (UID 0) to nfsnobody (UID 65534), NFS exports can have arbitrary owner IDs. To create an interactive shell within the same container running the application, you can use the oc rsh command, supplying it the environment variable holding the name of the pod. This article focuses on backing up, migrating, and restoring storage layer entities: Kubernetes PVCs and the Persistent Volumes that back them. OpenStack directory or a pod directory. Is storage in Openshift Online free tier actually persistent? let's say you have a test folder in which you have test.json that you want to copy so here would be the command. Using the --watch option causes the command to monitor the source path for any PVC from binding to the specified PV before yours does. The --delete option ensures that the resulting directories will match exactly, with directories/files in the local directory which are not found in the pod being deleted. kubectl cp <file-spec-src> <file-spec-dest>. Users can copy the files to PV to make it available to the pods (for example configuration files), or pods can create the files to make it accessible outside the OpenShift cluster (for example log files). argument, the command runs forever. I recently implemented a complete backup solution for our Red Hat OpenShift clusters. oc cp /:/cepfs/.. As you can see in the above image, the BackupEr pod has access to the PVC of the MyPod pod that is deployed in the OpenShift Project creatively named MyProject. We mount the persistent volume at /mnt inside of the container, which is the traditional directory used in Linux systems for temporarily mounting a volume. < pod_name >: /cepfs/ < sample_file >. < extension >. < extension >. < >... 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