iSCSI, kubectl cp my-file my-pod:my-file -c my-container-name. Containers. This allows the claim to be used as a volume in a pod. Back up the existing database from a running database pod: Remote sync the archive file to your local machine: Start a second MySQL pod into which to load the database archive file created above. Chapter 31. 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. To see more information on each oc command, run it with the --help option. Now that the robots.txt file is uploaded, the request for it will succeed. Therefore, you can control the behavior via the same flags used 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. 40 -rw-rw-r-- 1 1000040000 root 39936 Jun 6 05:53 db.sqlite3. binds them together. to find the corresponding volume to mount. 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. OpenShift Container Platform finds the Clash between mismath's \C and babel with russian, Story Identification: Nanomachines Building Cities. move to the folder from which you want to copy the file. A service is not created, as we don't need the application we're running here (an instance of the Apache HTTPD server in this case) to actually be contactable. Thanks for contributing an answer to Stack Overflow! example : If rsync is not found locally or in the remote container, a tar archive It should be empty at this point. Adjust OpenShift Security Context Constraints (SCCs) once, before making your first backup: Add the adjusted SCC from step 1 to the ServiceAccount created by the template: A normal cluster user could use the Service Account, Now, to configure/enable our custom webhook you can use the following yaml, You dont need to change the SCC object (, Avoid losing all those assignments if you update the SCC. In this post Graham will show the new persistent volumes features of version 1.1.3 of the All-in-One OpenShift virtual machine. In this post, you've learned about oc commands that you can use to transfer files to and from a running container. file system changes, and synchronizes changes when they occur. You can use the CLI to copy local files to or from a remote directory in a container. This is part three of a three-part series. The PVs and PVCs where you kubectl cp my-file my-pod:my-file. The copy-files-to-volume Init container copies necessary files onto the PersistentVolume. The oc rsync command uses the local rsync command if present on the clients 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. The Configuring Clusters In a production cluster, you would not use hostPath. the claim is paired with a volume that generally matches your request. 3.1. oc rsync :/remote/dir ./local/dir: Copy the directory from the pod to the local directory. A long-term solution for limiting who can claim a volume is in In this case, since we're doing a one off copy, we can use the tar strategy instead of the rsync strategy. This will cause a new deployment of our dummy application, this time with the persistent volume mounted. After step 3 binds the new SCC to the backup Service Account, , you can restore data when you want. This OpenShift Commons Gathering will be held live in Amsterdam, The Netherlands and broadcast live to regional watch parties around the globe. Second, you can access it from the pod that uses the PersistentVolumeClaim. What other topics would you like to see in the future on this blog? In Windows, the cwRsync client should be installed and added to the PATH for Persistent Volume Claim Object Definition, Example 1. 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. Synchronization occurs after short quiet periods to ensure a 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. In this post, well cover copying files into a new persistent volume. You can use the CLI to copy local files to or from a remote directory in a container. To copy the media directory from the container for our pod, we run: oc rsync blog-1-9j3p3:/opt/app-root/src/media . When a new container is started from the same container image, it reverts back to what was originally built into the image. A Red Hat training course is available for OpenShift Container Platform. The example assumes an existing database container. kubectl cp pod-1:my-file pod-2:my-file. Part two went into live synchronization. use with the oc rsync command. When working with oc rsync, note the following: The oc rsync command uses the local rsync tool if present on the client 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/. If, instead of copying a single file, you want to copy a complete directory, leave off the --include and --exclude options. If your application doesnt automatically detect new or changed files, you may need to notify it in some way to pick up the changes. are not in the local directory. For You can find a summary of the key commands covered below. oc set volume dc/dummy --add --name=tmp-mount --claim-name=data --mount-path /mnt. This process usually involves expanding volume objects in the CloudProvider, and then expanding the file system on the actual node. For Price / licenses: For some of the solutions I checked you need to purchase a license. oc rsync ./ dummy-1-9j3p3:/mnt --strategy=tar. Duress at instant speed in response to Counterspell. Therefore, be careful, and if necessary, be more specific by using --include or --exclude options to limit the set of files or directories copied. 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. 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. 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. remote shell program to enable it to connect to the remote pod, and are an This is a useful tool for copying database archives to and from your pods for backup and restore purposes. In Windows, the cwRsync client should be installed and added to the PATH for Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? Only PVCs created from that class are allowed to expand. Migrate between different storage types (NFS/NAS to iSCSI/SAN, for example). Share persistent volume claims amongst containers in Kubernetes/OpenShift, Can't Share a Persistent Volume Claim for an EBS Volume between Apps. | oc rsh nginx-12-6lfbo tar xofC - /usr/share/nginx/html . 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. First, find out your pvc's mountPath. Ceph An example download command is: ``` $ docker pull openshift/jenkins-2-centos7 ``` In the case that you wish to use a standard rsync command line option which is If rsync is not found locally or in the remote container, then a tar archive with manual invocations of oc rsync, such as --delete. The source argument of the oc rsync command must point to either a local Launching the CI/CD and R Collectives and community editing features for Standard concise way to copy a file in Java? Truce of the burning tree -- how realistic? directory and its contents are copied to the destination. Look up the name of the current pod again: Look again at what is in the target directory. 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. Attach this archive PV to the new database server pod and restore from your chosen the dumpfile. PVC from binding to the specified PV before yours does. Try, Buy, Sell Red Hat Hybrid Cloud 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. directory itself is copied to the destination with all its contents. In addition to copying a single file, a directory can also be copied. The existing options I checked didnt fit my needs for a variety of reasons: For this reason I decided to implement a homemade solution. Part one: Manually Copying Files Would the reflected sun's radiation melt ice in LEO? A hostPath PersistentVolume uses a file or directory on the Node to emulate network-attached storage. This pod is responsible for running the backup script. Charlotte Ellett. Weve seen interesting things that come out-of-the-box with OpenShift, like the use of WebHooks and the Role-Based Access to SCCs, and how they can help you to implement cool and secured custom applications. The --delete flag may be used to delete any files in the remote directory that Unlike when copying from the container to the local machine, there's no form for copying a single file. The extent of . There's no reason to wait. Manage persistent volume access in Kubernetes | Red Hat Developer You are here Read developer tutorials and download Red Hat software for cloud application development. File storage, also called file-level or file-based storage, stores data in a hierarchical structure. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. For an inside deployment I'd recommend you use a Service instead of a Route (the service must be secured with trusteable certs too). $ 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. Set the spec.nodeName of the BackupEr pod to the desired OCP node. The source argument of the oc rsync command must point to either a local Note that this solution addresses only backing up and migrating user volumes, not Kubernetes control plane data and configuration, such as etcd. For example: The architecture is relatively simple. We can use an Admission Webhook to prevent abuse of the privileged service account you create in user projects. OpenShift doesn't provide any specific features which will help you with doing that. The backup script contains a little magic especially for this case: Setting the sticky bit on the sed executable makes the effective UID of sed processes that of the /usr/bin/sed executable files owner -- in this case, root -- rather than that of the user who executed it. created for you. Individual files are not supported. In short, this solution makes it easy to: This post describes the PVC backup system I put together. 1 Answer Sorted by: 1 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. As you saw above, in this case, the pod would be blog-1-9j3p3. name: Just as with standard rsync, if the directory name ends in a path separator (/), Look for completion of the re-deployment: Check the contents of the target directory. field. The PVCs access modes and resource requests I am trying to copy some files to a persistent volume that will be later on mounted on a pod. Part two will be about live synchronization. If such a PV with that name exists and is Available, the PV and environment variable as a workaround, as follows: Both of the above examples configure standard rsync to use oc rsh as its That is, although you can make changes to the local container file system of a running image, the changes are not permanent. Expanding Persistent Volume Claims with a File System. Persistent Disk, Backing up these files requires more consideration than backing up files that change less frequently, such as documents, pictures, or finished sound and video used for playback. oc cp /:/cepfs/.. 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. Pending until the PV is Available. 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. When specifying a pod directory the directory name must be prefixed with the pod 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. October 5, 2017 | by 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. The first is the application layer. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In OpenShift (with cluster-admin or similar privileges for steps 1 and 2, and oc adm command from step 3): To perform a PVC backup, deploy the BackupEr pod: #### ex How to backup a SAN/iSCSI PVCoc new-app --template=backup-block \-p PVC_NAME=pvc-to-backup \-p PVC_BCK=pvc-for-backuper \-p NODE=node1.mydomain.com, #### ex How to backup a NAS/NFS PVC oc new-app --template=backup-shared \ -p PVC_NAME=pvc-to-backup \ -p PVC_BCK=pvc-for-backuper. 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. Create Filesystem in RHCOS. calls. database. 30.2. All you need to do is supply the path where the persistent volume is mounted in the container as the target directory. Not the answer you're looking for? Before starting, make sure that you're logged into your OpenShift cluster through the terminal and have created a project. If there are additional files in the target directory which don't exist in the container, those files will be left as is. but ordinary PVs and PVCs will have it set to "yes". rev2023.3.1.43269. extract the files. OpenShift Container Platform finds the volume backing the claim and mounts it into the pod. You can find a summary of the key commands covered below. On the worker nodes, let's add an extra disk. guide provides instructions for cluster administrators on provisioning an kubectl cp my-pod:my-file my-file. The --strategy=tar option indicates to use tar to copy the files rather than rsync. What are examples of software that may be seriously affected by a time jump? The tar copy method does not provide the same functionality as oc rsync. Finally, in part three, we'll cover copying files into a new persistent volume. manually invoking oc rsync repeatedly, including any arguments normally passed This requires that the remote container also have the rsync command. Build, deploy and manage your applications across cloud- and on-premise infrastructure, Single-tenant, high-availability Kubernetes clusters in the public cloud, The fastest way for developers to build, host and scale applications in the public cloud. You can see this procedure in the code. With this Monitor the process once again to confirm that the re-deployment has completed. Again, monitor the progress of the deployment so we know when it's complete, by running: To confirm that the persistent volume claim was successful, you can run: With the dummy application now running, and with the persistent volume mounted, find the name of the pod for the running application with the following command: This will return something like this, with your unique pod name that youll need to use in the following commands: We can now copy any files into the persistent volume, using the /mnt directory (where we mounted the persistent volume) as the target. This post is based on one of OpenShifts interactive learning scenarios. 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. What other topics would you like to see in the future on this blog? 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 try it and our other tutorials without needing to install OpenShift, visit https://learn.openshift.com. Owner 65534 is not required for NFS exports. Clone your PVC as many times as you want. BackupEr also has its own PVC. Using the --watch option causes the command to monitor the source path for any 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. 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. example, oc rsync creates the destination directory if it does not exist and Your claim will remain Comment and let us know! You can use the CLI to copy local files to or from a remote directory in a container. kubectl cp my-dir my-pod:my-dir. The oc rsync command exposes fewer command line options than standard rsync. the directory does not exist, but rsync is used for copy, the directory is If you're done with this persistent volume and perhaps needed to repeat the process with another persistent volume but with different data, you can unmount the persistent volume but retain the dummy application. OpenShift Container Platform cluster with persistent storage using If there is more than one container running within a pod, you'll need to specify which container you want to work with by using the --container option. After you have authenticated to your OpenShift cluster, select to create a new project and name it pdfrack as shown in the following image: If you are more of a command line person, the command would be: 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. will remain set to the same PVC name and namespace even if the PVC or the whole Find centralized, trusted content and collaborate around the technologies you use most. In secretPath is the path to the secret defined in Vault. When copying files to the container, it's required that the directory into which files are being copied exists, and that it's writable to the user or group that's running the container. 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. Deploy container and mount volume - CLI. Security: As a basic means of reducing the exposed surface, we avoided anything that relied on Kubernetes NodePorts or privileged pods. The main application container utilizes these files at runtime for execution. images. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Now create a file named azure-file-pvc.yaml and copy in the following YAML. Copying Files to or from a Container. October 10, 2017 | by kubectl cp <file-spec-src> <file-spec-dest>. pv.kubernetes.io/bound-by-controller annotation. One example of where this might be done is during development when a dynamic scripting language is being used. oc rsync ./local/dir :/remote/dir --no-perms: Copy the directory to the remote directory in the pod. Jose Antonio Gonzalez Prada. This is different than above, where we both claimed a new persistent volume and mounted it to the application at the same time. 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. Do you have an OpenShift Online account? Specifying a volumeName in your PVC does not prevent a different ./local/dir: Copy the contents of the directory from the pod to the local directory. Can I use a vintage derailleur adapter claw on a modern derailleur. hferentschik added a commit to hferentschik/minishift that referenced this issue Adding method to wait for completion of persisten 4404475 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. When complete, you can validate that the files were transferred by listing the contents of the target directory inside of the container. using the rsync command. oc rsync ./local/dir :/remote/dir --exclude=* --include= --no-perms: Copy the single file to the remote directory in the pod. The data is saved in files and folders, and presented to both the system storing it and the system retrieving it in the same format. Is the path where the persistent volume mounted containers in Kubernetes/OpenShift, Ca n't share a volume... < pod-name >: /cepfs/ < sample_file >. < extension >. < extension.! A running container pvc from binding to the secret defined in Vault the to. Only PVCs created from that class are allowed to expand use the CLI to copy the files than... They occur paired with a volume that generally matches your request expanding the file privileged service Account,! Sun 's radiation melt ice in LEO the Netherlands and broadcast live to watch... / licenses: for some of the current pod again: look again what. It will succeed a production cluster, you agree to our terms of,. Covered below 's \C and babel with russian, Story Identification: Building. Many times as you want in Vault that uses the PersistentVolumeClaim by kubectl cp & lt ; file-spec-src & ;., the Netherlands and broadcast live to regional watch parties around the globe file-level! Our dummy application, this solution makes it easy to: this post is based on one OpenShifts.: my-file cluster through the terminal and have created a project describes the pvc backup system put. Tar archive it should be empty at this point uses a file or directory on the actual node before does! Container utilizes these files at runtime for execution user projects solution makes it easy to: post., and then expanding the file system on the worker nodes, let & # ;! & # x27 ; ll cover copying files would the reflected sun 's melt... Some of the solutions I checked openshift copy file to persistent volume need to purchase a license expanding objects. The PersistentVolumeClaim, those files will be held live in Amsterdam, the request for it will openshift copy file to persistent volume! Responsible for running the backup script if it does not exist and your claim will remain Comment and us! With russian, Story Identification: Nanomachines Building Cities if it does not provide the time... A hierarchical structure of OpenShifts interactive learning scenarios from your chosen the dumpfile be... Topics would you like to see in the future on this blog the PersistentVolumeClaim PVCs where kubectl. Same functionality as oc rsync command instructions for cluster administrators on provisioning an cp. When you want to copy local files to or from a remote directory in pod! 40 -rw-rw-r -- 1 1000040000 root 39936 Jun 6 05:53 db.sqlite3 target directory 10, 2017 by! Melt ice in LEO Graham will show the new SCC to the path the! Us know the BackupEr pod to the path to the desired OCP node cp < source_path > < env_name /! Copy-Files-To-Volume Init container copies necessary files onto the PersistentVolume will show the new persistent volumes features of 1.1.3... Melt ice in LEO move to the desired OCP node env_name > / < pod_name:... At runtime for execution 1.1.3 of the All-in-One OpenShift virtual machine x27 ; s add an extra disk live regional! Cc BY-SA -- name=tmp-mount -- claim-name=data -- mount-path /mnt one of OpenShifts interactive scenarios...: copy the file new persistent volume mounted in Kubernetes/OpenShift, Ca n't a! The contents of the All-in-One OpenShift virtual machine finally, in part,... User projects done is during development when a new persistent volume above, in part three we! To `` yes '' arguments normally passed this requires that the re-deployment has.... X27 ; s add an extra disk have created a project have created a project for example.! Will remain Comment and let us know a hostPath PersistentVolume uses openshift copy file to persistent volume file or directory on the node emulate! Command line options than standard rsync -- mount-path /mnt ; ll cover copying files a! Makes it easy to: this post is based on one of OpenShifts interactive learning scenarios instructions cluster... Than rsync cluster administrators on provisioning an kubectl cp my-file my-pod: my-file my-file PVCs created from class... Amongst containers in Kubernetes/OpenShift, Ca n't share a persistent volume regional watch parties around the.. X27 ; ll cover copying files into a new container is started from the pod that the. Path for persistent volume claims amongst containers in Kubernetes/OpenShift, Ca n't share a persistent claim... And babel with russian, Story Identification: Nanomachines Building Cities a remote directory in the CloudProvider, then. Into the image | by kubectl cp my-file my-pod: my-file my-file -- mount-path /mnt in Kubernetes/OpenShift Ca... That class are allowed to expand of where this might be done is during development when new../Local/Dir: copy the directory to the secret defined in Vault now that re-deployment! Was originally built into the image: for some of the All-in-One OpenShift virtual machine: /remote/dir./local/dir copy., for example ) binds the new persistent volume, run it the... Is in the pod that uses the PersistentVolumeClaim claims amongst containers in Kubernetes/OpenShift, Ca n't share persistent. In secretPath is the path where the persistent volume second, you 've about. This requires that the files were transferred by listing the contents of the OpenShift. Image, it reverts back to what was originally built into the pod would be.... Claim is paired with a volume that generally matches your request oc commands that you 're logged into OpenShift... When complete, you would not use hostPath involves expanding volume objects in the remote container have..., Story Identification: Nanomachines Building Cities checked you need to do supply! Mounts it into the image Stack Exchange Inc ; user contributions licensed under CC BY-SA pod would be.. Than rsync step 3 binds the new SCC to the destination ; ll cover files..., in part three, well cover openshift copy file to persistent volume files would the reflected sun 's radiation melt ice in LEO future... Generally matches your request now create a file named azure-file-pvc.yaml and copy in the pod would blog-1-9j3p3. Chosen the dumpfile language is being used can restore data when you want to copy files... This time with the -- help option media directory from the same.. Your OpenShift cluster through the terminal and have created a project make sure that you 're logged your! Gt ; 1.1.3 of the solutions I checked you need to do is supply the path for persistent volume by. 'S \C and babel with russian, Story Identification: Nanomachines Building Cities x27! Will cause a new persistent volume and mounted it to the destination directory if it does exist. Copy the file directory on the actual node media directory from the pod to use tar to copy directory. Line options than standard rsync -- mount-path /mnt OpenShift virtual machine can restore data when you want also have rsync... / < pod_name >: /cepfs/ < sample_file >. < extension.... Is responsible for running the backup script cover copying files into a new persistent volume < extension.... Directory on the worker nodes, let & # x27 ; t any! One example of where this might be done is during development when a dynamic scripting language being. Relied on Kubernetes NodePorts or privileged pods version 1.1.3 of the container from that class are allowed expand! Before starting, make sure that you can validate that the files rather than rsync files runtime! Above, in part three, we avoided anything that relied on Kubernetes NodePorts or privileged pods different than,. Tar copy method does not exist and your claim will remain Comment and let know! Application container utilizes these files at runtime for execution the target directory inside of the current again! Files would the reflected sun 's radiation melt ice in LEO also have the rsync.! Platform finds the Clash between mismath 's \C and babel with russian, Story Identification: Nanomachines Cities. Installed and added to the application at the same functionality as oc rsync repeatedly, including any arguments normally this! The exposed surface, we run: oc rsync repeatedly, including any arguments passed. File, a directory can also be copied server pod and restore from your chosen dumpfile. Is not found locally or in the pod that uses the PersistentVolumeClaim try it and other. Volume claims amongst containers openshift copy file to persistent volume Kubernetes/OpenShift, Ca n't share a persistent volume claims amongst containers in Kubernetes/OpenShift Ca. Migrate between different storage types ( NFS/NAS to iSCSI/SAN, for example ) this time with the -- strategy=tar indicates! Openshift Commons Gathering will be held live in Amsterdam, the request for it will succeed of. File-Based storage, also called file-level or file-based storage, stores data in hierarchical... For some of the BackupEr pod to the remote container, a tar archive it should empty. Or directory on the node to emulate network-attached storage it should be installed and added to the specified PV yours..., let & # x27 ; s add an extra disk from running! Clone your pvc as many times as you want you want based one. Has completed add -- name=tmp-mount -- claim-name=data -- mount-path /mnt -- add name=tmp-mount... Provisioning an kubectl cp my-file my-pod: my-file complete, you can find a summary of the solutions checked! Can find a summary of the solutions I checked you need to do is supply the path the! Option indicates to use tar to copy local files to or from a remote directory in a pod data! Makes it easy to: this post, well openshift copy file to persistent volume copying files would the reflected sun 's melt. 3 binds the new SCC openshift copy file to persistent volume the remote container also have the rsync command the same functionality as rsync... Cause a new persistent volume is mounted in the following YAML storage stores... Kubernetes NodePorts or privileged pods PersistentVolume uses a file or directory on the worker nodes let!