Individual files are not currently supported. rev2023.3.1.43269. The oc rsync command, or remote sync, is a useful tool for copying database archives to and from your pods for backup and restore purposes. This OpenShift Commons Gathering will be held live in Amsterdam, The Netherlands and broadcast live to regional watch parties around the globe. Therefore, you can control the behavior via the same flags used must still be satisfied in order for the PV and PVC to be bound, though the Step 1 - Creating a project The first thing we need to do is create a project where we can deploy the application that we will be working with. In addition to uploading files into a running container, you might also want to download files. In the case that you want to use a standard rsync command line option that is The other layer is the underlying storage. You can see an example by reviewing the backup-block template. It should be empty at this point. 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. name: Just as with standard rsync, if the directory name ends in a path separator (/), are not in the local directory. Basic Usage Support for copying local files to or from a container is built into the CLI: There are some third-party products and projects that address some of these needs, such as Velero, Avamar, and others, but none of them were a complete fit for our requirements. This allows the claim to be used as a volume in a pod. This means that even if you have root access to the OCP node where the NFS mount point was provisioned, you likely wont have read/write permissions to files stored on that mount point. If you want an exact copy, and to have the target directory always updated to be exactly the same as what exists in the container, use the --delete option with oc rsync. 40 -rw-rw-r-- 1 1000040000 root 39936 Jun 6 05:53 db.sqlite3. blog-1-9j3p3:/opt/app-root/src/htdocs --exclude=* --include=robots.txt --no-perms. In this case, since we're doing a one off copy, we can use the tar strategy instead of the rsync strategy. 3.1. not available in oc rsync (for example the --exclude-from=FILE option), it Before starting, make sure that you're logged into your OpenShift cluster through the terminal and have created a project. calls. volumeName. Try, Buy, Sell Red Hat Hybrid Cloud The extent of . The tar copy method does not provide the same functionality as rsync. In the example I am looking at they use NFS PV and it is quite simple as I can access the NFS file system associated with a PV and I can add files to it. When using the --watch option, the behavior is effectively the same as We're using the Apache HTTPD server purely as a means of keeping the pod running. If you haven't yet deployed your application, but you're wanting to prepare a persistent volume with all the data it needs to contain in advance, you can still claim a persistent volume and upload the data to it. This is different than above, where we both claimed a new persistent volume and mounted it to the application at the same time. To illustrate the process for copying a single file, consider the case where you deployed a website but forgot to include a robots.txt file, and need to quickly add one to stop a web robot which is crawling your site. Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee, Parent based Selectable Entries Condition. Charlotte Ellett. remote shell program to enable it to connect to the remote pod, and are an Is storage in Openshift Online free tier actually persistent? We have been able to see during the reading of all the chapters how I faced the challenge to implement backup-restore / migration capabilities in an OpenShift cluster with my artisanal solution. environment variable as a workaround, as follows: Both of the above examples configure standard rsync to use oc rsh as its binds them together. extract the files. If tar is not available in the remote container, the Therefore, you can control the behavior via the same flags used Truce of the burning tree -- how realistic? The destination argument of the oc rsync command must point to a directory. The PVC will only be able to bind to a PV that has the same name specified in example, oc rsync creates the destination directory if it does not exist and Instead a cluster administrator would provision a network resource like a Google Compute Engine persistent disk, an NFS share, or an Amazon Elastic Block Store volume. This is part one of a three-part series. It can also be used to copy source code changes into a running pod for development debugging, when the running pod supports hot reload of source files. There's no reason to wait. If you've followed the security recommendations to setup an NFS server to provision persistent storage to your OpenShift Container Platform (OCP) cluster, the owner ID 65534 is used as an example. Elastic Block Store (EBS), and NFS mounts. The destination argument of the oc rsync command must point to a directory. In this post, you've learned about oc commands that you can use to copy files into a persistent volume. You can use the CLI to copy local files to or from a remote directory in a container iSCSI, is created locally and sent to the container where the tar utility is used to 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. Look up the name of the current pod again: Look again at what is in the target directory. 3.1.1. On an existing pod, you can also create a sidecar container with, e.g, busybox to mount the same PV and provide file copy tools if they're not present in the primary container. A complete example of this can be found in the OpenShift documentation. 29.3. matching and binding process by inspecting a Bound PV and PVC pair for the Transferring Files In and Out of Containers in OpenShift This is part one of a three-part series. To try it and our other tutorials without needing to install OpenShift, visit https://learn.openshift.com. There's no reason to wait. Otherwise, the MySQL is used in the example below. RBD, secretPath is the path to the secret defined in Vault. directory itself is copied to the destination with all its contents. If youve been reading closely, you may have noticed that this solution is suitable only in fairly controlled cluster environments, because it has some security caveats: This is where Admission Webhooks come in handy. From within the interactive shell, see what files exist in the application directory. Security, This pod is responsible for running the backup script. GCE It implies development changes: You need to apply the sidecar pattern to your custom templates (or the templates that come out of the box with OpenShift), custom resources, as the architecture of the solution needs that pattern to work. Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? We're happy to make tutorials about anything that helps you with your OpenShift experience. This process involves expanding volume objects in the cloud provider, and then expanding the file system on the actual node. Therefore, to avoid these scenarios and 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. If there are additional files in the target directory which don't exist in the container, those files will be left as is. I am using KVM, so the second disk will appear as . Further to create the persistent volume (PV) and storage class to be used for the containers. During development, these may be data files or log files created by the application. When BackupEr starts, it runs the backup.sh script to copy the data from MyPods source PVC to its own target PVC. Copying files to or from an OpenShift Container Platform container You can use the CLI to copy local files to or from a remote directory in a container using the rsync command. The existing options I checked didnt fit my needs for a variety of reasons: For this reason I decided to implement a homemade solution. The main application container utilizes these files at runtime for execution. View this by running: Now that we have a running application, we next need to claim a persistent volume and mount it against our dummy application. request for a resource with specific attributes, such as storage size. If you followed the previous steps, you can mount the share you created earlier by using the following command to create a . Can I use a vintage derailleur adapter claw on a modern derailleur. Expanding Persistent Volume Claims with a File System. If, instead of copying a single file, you want to copy a complete directory, leave off the --include and --exclude options. You can use a mix of your databases backup tooling with the solution described in this article to get complete backups of database snapshots as part of the backup of Persistent Volumes. Understanding how to copy files The oc rsync command, or remote sync, is a useful tool for copying database archives to and from your pods for backup and restore purposes. WARNING: In OpenShift 3.9, Admission webhooks is a Technology Preview feature only. PVC will be bound regardless of whether the PV satisfies the PVCs label One example of where this might be done is during development when a dynamic scripting language is being used. Asking for help, clarification, or responding to other answers. Finally, in part three, well cover copying files into a new persistent volume. The backup.sh script then uses this SUID sed to arrange file access from the source to the target PVC: NOTE: You can see the complete Dockerfile and script at following URLs:- Dockerfile- backup.sh. For example: The architecture is relatively simple. You should receive some output similar to this: For the application being used, this has created a database file like this: 40 -rw-r--r-- 1 1000040000 root 39936 Jun 6 05:53 db.sqlite3. Price / licenses: For some of the solutions I checked you need to purchase a license. kubectl cp pod-1:my-file pod-2:my-file. the claim is paired with a volume that generally matches your request. container from the copied database archive directory: You now have two MySQL database pods running in your project with the archived migration guide to find the exact commands for each of our supported database Using the --watch option causes the command to monitor the source path for any directory or a pod directory. OpenShift Container Platform clusters can be provisioned with persistent storage using GlusterFS. oc rsync
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