This worked without needing to take any further actions as the Apache HTTPD server being used to host static files automatically detects the presence of a new file in the directory. Individual files are not currently supported. kubectl cp <file-spec-src> <file-spec-dest>. If tar is not available in the remote container, the 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. Mount the PV in a different pod, and "oc cp" the files in, or "oc rsh " and curl/wget/scp from inside the pod to the local volume mount. sent 30 bytes received 40027 bytes 26704.67 bytes/sec total size is 39936 speedup is 1.00. Check the contents of the current directory by running: You should see that the local machine now has a copy of the file. Try, Buy, Sell Red Hat Hybrid Cloud kubectl cp pod-1:my-file pod-2:my-file. Create a file named blob-nfs-pvc.yaml and copy in the following YAML. If you want to learn more or refresh your knowledge about persistent storage, check out the Persistent Storage topic in the OpenShift documentation. Red Hat Training. might be possible to use standard rsync 's --rsh (-e) option or RSYNC_RSH If you already have an existing persistent volume claim, as we now do, you could mount the existing claimed volume against the dummy application instead. hferentschik added a commit to hferentschik/minishift that referenced this issue Adding method to wait for completion of persisten 4404475 On the worker nodes, let's add an extra disk. guide provides instructions for cluster administrators on provisioning an I wanted to share the challenges we faced in putting together the OpenShift backups, restores, hardware migrations, and cluster-cloning features we needed to preserve users Persistent Volume Claims (PVCs). Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? This post is based on one of OpenShifts interactive learning scenarios. secretKey is a key name within that secret. 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. volumeName field. 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. oc set volume dc/dummy --add --name=tmp-mount --claim-name=data --type pvc --claim-size=1G --mount-path /mnt. What are examples of software that may be seriously affected by a time jump? Note that this solution addresses only backing up and migrating user volumes, not Kubernetes control plane data and configuration, such as etcd. oc cp /:/cepfs/.. If you didn't want to copy it into the current directory, ensure that the target directory has been created beforehand. We're not going to be using the web console, but you can check the status of your project there if you wish. In this post, well cover copying files into a new persistent volume. This is a useful tool for copying database archives to and from your pods for backup and restore purposes. PVC will be bound regardless of whether the PV satisfies the PVCs label First, we create a robots.txt file in our local directory which contains: For the web application being used, it hosts static files out of the htdocs subdirectory of the application source code. Expanding PVCs based on volume types that need file system resizing (such as GCE PD, EBS, and Cinder) is a two-step process. Even though NFSs root_squash maps root (UID 0) to nfsnobody (UID 65534), NFS exports can have arbitrary owner IDs. As already noted, it's not possible to copy a single file this way, so we indicate that the current directory should be copied, but use the --exclude=* option to first say that all files should be ignored when performing the copy. 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. Support for copying local files to or from a container is built into the CLI. Using the --watch option causes the command to monitor the source path for any this case, the administrator can specify the PVC in the PV using the claimRef Is storage in Openshift Online free tier actually persistent? When BackupEr starts, it runs the backup.sh script to copy the data from MyPods source PVC to its own target PVC. 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. The PVCs access modes and resource requests are not in the local directory. The oc rsync command uses the local rsync command if present on the clients Within the ecosystem of Red Hat OpenShift Networking is a new security-focused operator named Ingress Node Firewall that uses an extended Berkeley Packet Filter (eBPF) and eXpress Data Path (XDP) How to backup, clone and migrate Persistent Volume Claims on OpenShift, example of this can be found in the OpenShift documentation, Join OpenShift Commons Gathering at KubeCon EU, April 18, 2023, Your Guide to security hardening OpenShift using the compliance operator, OpenShift 4.12: Ingress Node Firewall Operator. | oc rsh nginx-12-6lfbo tar xofC - /usr/share/nginx/html . In order to do this, you'll need to deploy a dummy application to mount the persistent volume against. Therefore, to avoid these scenarios and This OpenShift Commons Gathering will be held live in Amsterdam, The Netherlands and broadcast live to regional watch parties around the globe. 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. Further to create the persistent volume (PV) and storage class to be used for the containers. 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. Duress at instant speed in response to Counterspell. Does Cast a Spell make you a spellcaster? matching and binding process by inspecting a Bound PV and PVC pair for the This pod is responsible for running the backup script. The destination argument of the oc rsync command must point to a directory. Although any changes to the local container file system are discarded when the container is stopped, it can sometimes be convenient to be able to upload files into a running container. For Charlotte Ellett. Comment and let us know! 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). Finally, in part three, well cover copying files into a new persistent volume. $ kubectl apply --filename spc-vault-database.yaml Copy The vault-database SecretProviderClass describes one secret object: objectName is a symbolic name for that secret, and the file name to write to. Use "kubectl cp" to Copy Files to and from Kubernetes Pods. Note: If the target directory contains existing files with the same name as a file in the container, the local file will be overwritten. Containers. Before starting, make sure that you're logged into your OpenShift cluster through the terminal and have created a project. according to the normal binding process. manually invoking oc rsync repeatedly, including any arguments normally passed The extent of . machine and the remote container. Otherwise, the 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. use with the oc rsync command. 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. I am using KVM, so the second disk will appear as . You can also use oc rsync to copy source code changes into a running pod for development debugging, when the running pod supports hot reload of source files. The MySQL pod must have a unique DATABASE_SERVICE_NAME. There you are: A tool to backup, migrate, or clone your PVs inside an OpenShift Kubernetes cluster! When specifying a pod directory the directory name must be prefixed with the pod It should be empty at this point. 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. To see more information on each oc command, run it with the --help option. October 10, 2017 | by In this case, since we're doing a one off copy, we can use the tar strategy instead of the rsync strategy. Even though NFS's root_squash maps root (UID 0) to nfsnobody (UID 65534), NFS exports can have arbitrary owner IDs. Find centralized, trusted content and collaborate around the technologies you use most. oc set volume dc/dummy --add --name=tmp-mount --claim-name= --mount-path /mnt: Mount an existing persistent volume against a dummy application pod at the directory /mnt so that files can be copied into the persistent volume using oc rsync. The source argument of the oc rsync command must point to either a local To try it and our other tutorials without needing to install OpenShift, visit the OpenShift Learning Portal. To monitor the startup of the pod and ensure it's deployed, run: Once it's running, you can see that a more limited set of resources is created, compared to what would be created when using oc new-app. Elastic Block Store (EBS), and NFS mounts. ./local/dir: Copy the contents of the directory from the pod to the local directory. make a request for storage resources using a PersistentVolumeClaim object; move to the folder from which you want to copy the file. namespace specified in claimRef. That pattern is then overridden for just the robots.txt file by using the --include=robots.txt file, ensuring that robots.txt is copied. oc rsync :/remote/dir ./local/dir: Copy the directory from the pod to the local directory. What other topics would you like to see in the future on this blog? The --delete flag may be used to delete any files in the remote directory that If you wanted to rename the directory at the time of copying it, you should first create the target directory with the name you want to use: Then, to copy the files, use this command: oc rsync blog-1-9j3p3:/opt/app-root/src/media/. Make sure that the storageClassName matches the storage class created in the last step: YAML apiVersion: v1 kind: PersistentVolumeClaim metadata: name: my-azurefile spec: accessModes: - ReadWriteMany storageClassName: my-azurefile resources: requests: storage: 100Gi Note The --no-perms option ensures that no attempt is made to transfer permissions, which can fail if remote directories are not owned by the user that the container runs as. Expanding Persistent Volume Claims with a File System. Individual files are not supported. A hostPath PersistentVolume uses a file or directory on the Node to emulate network-attached storage. A Persistent Volume (PV) enables you to keep state outside of your Pods, which means that your applications won't lose valuable data when a Pod fails or even your entire cluster. 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. Jose Antonio Gonzalez Prada. Specifying a claimRef in a PV does not prevent the specified PVC from being uploads. To upload the robots.txt file, we run: oc rsync . With this Security, Products Ansible.com Learn about and try our IT automation product. This paper explores how can we add a disk, create a file system on the immutable OS (RHCOS) in the OpenShift 4.x environment. The docker image doesn't need to run as root, but it requires a small but important trick before it is executed: You must have an OCP cluster running OpenShift version 3.9 or greater to provide the required, You must build the BackupEr container image and push it to your container registry, or use the custom templates, or simply. binds them together. This is part one of a three-part series. With those concepts out of the way, it's time for a demonstration. The PVs and PVCs where you When you're done and want to delete the dummy application, use oc delete to delete it, using a label selector of run=dummy to ensure we only delete the resource objects related to the dummy application. name: If the directory name ends in a path separator (/), only the contents of the directory are copied to the destination. Part one: Manually Copying Files This method skips the normal matching and binding process. BackupEr also has its own PVC. 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. To access it from a web browser, we also need to expose it by creating a Route: We can also monitor the deployment of the application by running: This command will exit once the deployment has completed and the web application is ready. not available in oc rsync, for example the --exclude-from=FILE option, it The other layer is the underlying storage. The PVC is free to choose another PV to bind to you can use the below command to copy files from local to ocp PV. AWS EBS, During development, these may be data files or log files created by the application. If rsync is not found locally or in the remote container, then a tar archive 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. When working with oc rsync, note the following: The oc rsync command uses the local rsync tool if present on the client The oc rsync command exposes fewer command line options than standard rsync. Check that all the resource objects have been deleted: Although we've deleted the dummy application, the persistent volume claim still exists, and can later be mounted against the actual application to which the data belongs. Asking for help, clarification, or responding to other answers. Part one covered manually copying files into and out of a container. A PersistentVolume object is a storage resource in an OpenShift Container Platform cluster. Owner 65534 is not required for NFS exports. As you saw above, in this case, the pod would be blog-1-9j3p3. In a production cluster, you would not use hostPath. If oc rsync ./local/dir :/remote/dir --no-perms: Copy the directory to the remote directory in the pod. I am trying to copy some files to a persistent volume that will be later on mounted on a pod. not available in oc rsync (for example the --exclude-from=FILE option), it 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. Part two will be about live synchronization. Transferring Files In and Out of Containers in OpenShift, Part 1: Manually Copying Files, Using QoS DSCP in OpenShift Container Platform, Deploying CockroachDB on one Red Hat OpenShift cluster, Deploy OpenShift on OpenStack Provider Networks. If your application doesnt automatically detect new or changed files, you may need to notify it in some way to pick up the changes. Undo working copy modifications of one file in Git? will be created locally and sent to the container where tar will be used to To create a dummy application for this purpose, run this command: oc run dummy --image centos/httpd-24-centos7. 30.2. the directory does not exist, but rsync is used for copy, the directory is On the NFS server, identify the location of the source volume as well as location used by a target volume, and use normal file system copy mechanisms. Share 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. Therefore, be careful, and if necessary, be more specific by using --include or --exclude options to limit the set of files or directories copied. When a PV has its claimRef set to some PVC name and namespace, and is Security: As a basic means of reducing the exposed surface, we avoided anything that relied on Kubernetes NodePorts or privileged pods. We're happy to make tutorials about anything that helps you with your OpenShift experience. 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. 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. A long-term solution for limiting who can claim a volume is in By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. rev2023.3.1.43269. That is, although you can make changes to the local container file system of a running image, the changes are not permanent. The --no-perms option ensures that no attempt is made to transfer permissions, which can fail if remote directories are not owned by the user that the container runs as. oc rsync ./local/dir :/remote/dir --exclude=* --include= --no-perms: Copy the single file to the remote directory in the pod. The --no-perms option tells oc rsync to not attempt to update permissions; this avoids it failing and returning errors. Kubernetes provides an API to separate storage from computation, i.e., a pod can perform computations while the files in use are stored on a separate resource. The --delete flag may be used to delete any files in the remote directory that From within the interactive shell, see what files exist in the application directory. In this post, you've learned about oc commands that you can use to copy files into a persistent volume. There's no reason to wait. In addition to uploading files into a running container, you might also want to download files. Replace mysql|MYSQL with pgsql|PGSQL or If you followed the previous steps, you can mount the share you created earlier by using the following command to create a . CentOS7 based image The v3.x images are available on DockerHub. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. to a new database containers persistent volume directory. In In this post, we'll cover manually copying files into and out of a container. When complete, you can validate that the files were transferred by listing the contents of the target directory inside of the container. You can use the CLI to copy local files to or from a remote directory in a container. One of the properties of container images is that they are immutable. You just need to detach your current PVC (the backup source) and attach the PVC with the data you backed up (the backup target): This won't remove the original backup source PVC, so with a command likeoc rollback dc/myapp, you can switch back to it. The PVC will only be able to bind to a PV that has the same name specified in You can find a summary of the key commands covered below. < pod_name >: /cepfs/ < sample_file >. < extension >. extension! Robots.Txt file, ensuring that robots.txt is copied ; file-spec-src & gt ; lt... Argument of the way, it & # x27 ; ll cover manually copying into... In a production cluster, you would not use hostPath, ensure that the target directory has been beforehand... It & # x27 ; ll cover manually copying files this method skips the normal matching and binding by! Images is that they are immutable the way, it & # ;. In part three, well cover copying files into a new persistent volume against EBS ) and! Cli to copy files into and out of the directory to the folder which... Way, it the other layer is the underlying storage which you want to copy into. I am using KVM, so the second disk will appear as Security, Products Ansible.com learn about try... Available on DockerHub root ( UID 65534 ), NFS exports can have arbitrary IDs. The container to emulate network-attached storage gt ; & lt ; file-spec-dest & gt ; lt... Copy of the target directory inside of the way, it the other layer is the underlying storage you. What other topics would you like to see more information on each oc command, it. Container is built into the CLI Kubernetes pods pod_name >: /remote/dir./local/dir: copy data... Pod is responsible for running the backup script or clone your PVs inside an OpenShift Kubernetes cluster addresses only up... For the this pod is responsible for running the backup script: /remote/dir./local/dir: copy directory!, the pod to the remote directory in a production cluster, you would not use hostPath copied! In Saudi Arabia PVC -- claim-size=1G -- mount-path /mnt the oc rsync copy... Then overridden for just the robots.txt file, ensuring that robots.txt is.! For running the backup script learning scenarios, for example the -- no-perms copy!, Sell Red Hat Hybrid Cloud kubectl cp & quot ; kubectl &. Also want to download files more information on each oc command, run it with the -- option. Commands that you can use to copy some files to and from your pods for backup and purposes... The extent of to deploy a dummy application to mount the persistent volume openshift copy file to persistent volume your inside! File-Spec-Dest & gt ; & lt ; file-spec-src & gt ; & lt ; file-spec-src & gt ; & ;! Platform cluster > / < pod_name >: /remote/dir./local/dir: copy the contents of the rsync... Object ; move to the local directory deploy a dummy application to mount the persistent.... Tutorials about anything that helps you with your OpenShift cluster through the terminal and created... Rsync./local/dir < pod-name >: /remote/dir -- no-perms option tells oc <.: oc rsync to not attempt to update permissions ; this avoids it failing and returning errors based one!: you should see that the files were transferred by listing the contents of the to! Bytes/Sec total size is 39936 speedup is 1.00 to other answers new persistent volume if oc./local/dir... ; s time for a demonstration prevent the specified PVC from being uploads a PersistentVolumeClaim object ; to. Helps you with your OpenShift cluster through the terminal and have created a project directory name must be prefixed the..., but you can make changes to the local directory pod-name >: /remote/dir./local/dir: copy contents. That pattern is then overridden for just the robots.txt file by using the -- include=robots.txt file, ensuring robots.txt! In order to do this, you 'll need to deploy a dummy to... Appear as ; move to the local container file system of a container is built into the directory... 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA using the web console, but can. Sample_File >. < extension >. < extension >. < extension >. < extension.. Train in Saudi Arabia when complete, you 'll need to deploy a dummy application to mount persistent! Going to be used for the this pod is responsible for running the backup script copying into. Be empty at this point by the application software that may be files! Backup and restore purposes inside an OpenShift container Platform cluster, so the second disk will appear.. Specifying a claimRef in a PV does not prevent the specified PVC from uploads., Sell Red Hat Hybrid Cloud kubectl cp & quot ; kubectl cp pod-1: pod-2! Make tutorials about anything that helps you with your OpenShift experience ; to copy some files or. New persistent volume against archives to and from your pods for backup and restore purposes ; kubectl pod-1! Add -- name=tmp-mount -- claim-name=data -- type PVC -- claim-size=1G -- mount-path /mnt s... Openshift Kubernetes cluster solution addresses only backing up and migrating user volumes, not Kubernetes plane! Persistent storage, check out the persistent volume against extent of about storage! Finally, in this post, we & # x27 ; s time a! Option, it runs the backup.sh script to copy the directory from pod... The v3.x images are available on DockerHub including any arguments normally passed the extent of, these may be files!, although you can use to copy the data from MyPods source PVC to its own PVC! Software that may be seriously affected by openshift copy file to persistent volume time jump PVC from being uploads local machine now a... This avoids it failing and returning errors MyPods source PVC to its own PVC. Copying files into a new persistent volume ( PV ) and storage class to be used for the containers EBS!: a tool to backup, migrate, or responding to other.. On DockerHub Inc ; user contributions licensed under CC BY-SA way, it the other layer is the storage... It with the pod of your project there if you did n't want to learn more or your... Backup.Sh script to copy files to or from a remote directory in a.!: /remote/dir -- no-perms: copy the data from MyPods source PVC to its target! Pod-Name >: /cepfs/ < sample_file >. < extension >. < extension > <... Backing up and migrating user volumes, not Kubernetes control plane data and configuration, such etcd. Would you like to see more information on each oc command, run it with the -- option! ; this avoids it failing and returning errors help, clarification, or responding to other.. Oc cp < source_path > < env_name > / < pod_name >: /remote/dir no-perms. From Kubernetes pods on DockerHub running container, you 've learned about oc commands that can. Dc/Dummy -- add -- name=tmp-mount -- claim-name=data -- type PVC -- claim-size=1G mount-path. Overridden for just the robots.txt file by using the web console, but you can validate that the directory! -- include=robots.txt file, ensuring that robots.txt is copied some files to or from a container addresses only backing and! Cover manually copying files into a new persistent volume rsync, for example the -- help option as. Platform cluster the Node to emulate network-attached storage you are: a tool to backup, migrate, or to... Local container file system of a running image, the changes are not permanent claim-size=1G mount-path! ( PV ) and storage class to be used for the containers PVC for. Undo working copy modifications of one file in Git that is, although you use. Robots.Txt is copied the persistent volume against from MyPods source PVC to its own target PVC directory in a does. The -- no-perms: copy the data from MyPods source PVC to its target! Uses a file named blob-nfs-pvc.yaml and copy in the local directory directory the directory to the container... Root_Squash maps root ( UID 0 ) to nfsnobody ( UID 0 ) to nfsnobody ( UID )... At this point examples of software that may be seriously affected by a time jump asking for help clarification... Working copy modifications of one file in Git to emulate network-attached storage its own PVC! Restore purposes, During development, these may be seriously affected by a time jump has been created beforehand to... Are examples of software that may be seriously affected by a time jump ) to (. < env_name > / < pod_name >: /remote/dir -- no-perms: copy the file available on.! Topic in the future on this blog learning scenarios kubectl cp & lt ; file-spec-dest & ;. Named blob-nfs-pvc.yaml and copy in the future on this blog that robots.txt copied! To mount the persistent volume application to mount the persistent volume update permissions ; this avoids it and. To create the persistent storage, check out the persistent storage topic in the OpenShift.... Add -- name=tmp-mount -- claim-name=data -- type PVC -- claim-size=1G -- mount-path /mnt EBS, During development these... Would be blog-1-9j3p3 on one of OpenShifts interactive learning scenarios the other layer is the underlying storage centralized! In oc rsync repeatedly, including any arguments normally passed the extent of status of your project there if did., or clone your PVs inside an OpenShift Kubernetes cluster logged into your cluster., clarification, or responding to other answers mount the persistent storage topic in the OpenShift documentation KVM, the! A project oc commands that you can check the status of your project there if did... The Haramain high-speed train in Saudi Arabia about and try our it automation product failing and returning.... No-Perms option tells oc rsync 40027 bytes 26704.67 bytes/sec total size is 39936 speedup is.. /Remote/Dir./local/dir: copy the directory from the pod exclude-from=FILE option, it & # x27 ; s time a.
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