I didnt mention this before, but I tried to keep it the installation steps as simple as possible, as this is a very interesting approach (GA since 3.11 and above). Security: As a basic means of reducing the exposed surface, we avoided anything that relied on Kubernetes NodePorts or privileged pods. From within the interactive shell, see what files exist in the application directory. 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. oc set volume dc/dummy --add --name=tmp-mount --claim-name=data --type pvc --claim-size=1G --mount-path /mnt. 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/. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. We will discuss the security implications of this UID munging later in this post. MySQL is used in the example below. To copy our single database file from our pod, we run: oc rsync blog-1-9j3p3:/opt/app-root/src/db.sqlite3 . selector, access modes, and resource requests. Price / licenses: For some of the solutions I checked you need to purchase a license. 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. Deploy container and mount volume - CLI. The existing options I checked didnt fit my needs for a variety of reasons: For this reason I decided to implement a homemade solution. 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. You have a few options. Unlike when copying from the container to the local machine, there's no form for copying a single file. When copying a directory, you can be more selective about what is copied by using the --exclude and --include options to specify patterns to be matched against directories and files, with them being excluded or included as appropriate. 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. Products Ansible.com Learn about and try our IT automation product. rev2023.3.1.43269. Asking for help, clarification, or responding to other answers. volumeName. development. This post is based on one of OpenShifts interactive learning scenarios. To demonstrate transferring files to and from a running container, we first need to deploy an application. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. 1 - Create an Azure Red Hat OpenShift cluster 2 - Connect to an Azure Red Hat OpenShift cluster 3 - Delete an Azure Red Hat OpenShift cluster Quickstarts How-to guides Cluster operations Networking Storage Encrypt cluster data with customer-managed key Create an Azure Files Storageclass Use the built-in container registry You can request storage by creating PersistentVolumeClaim objects in your 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. Look for completion of the re-deployment: Check the contents of the target directory. you can use the below command to copy files from local to ocp PV. 31.1. This will cause a new deployment of our dummy application, this time with the persistent volume mounted. Expanding persistent volume claims (PVCs) with a file system Expanding PVCs based on volume types that need file system resizing, such as GCE PD, EBS, and Cinder, is a two-step process. With this 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: 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. The PVC will only be able to bind to a PV that has the same name specified in 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. directory itself is copied to the destination with all its contents. 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. AWS EBS, PersistentVolume objects from sources such as GCE Persistent Disk, AWS This is because the persistent volume is no longer mounted, and you're looking at the directory within the local container file system. That is, although you can make changes to the local container file system of a running image, the changes are not permanent. When complete, you can validate that the files were transferred by listing the contents of the target directory inside of the container. guide provides instructions for cluster administrators on provisioning an claim with the given name in the same namespace as the pod, then uses the claim Otherwise, the kubectl cp my-file my-pod:my-file. oc set volume dc/dummy --add --name=tmp-mount --claim-name= --type pvc --claim-size=1G --mount-path /mnt: Claim a persistent volume and mount it against the dummy application pod at the directory /mnt so that files can be copied into the persistent volume using oc rsync. For directory and its contents are copied to the destination. In a production cluster, you would not use hostPath. Jose Antonio Gonzalez Prada. ensure your claim gets bound to the volume you want, you must ensure that both This requires that the remote container also have the rsync command. Share persistent volume claims amongst containers in Kubernetes/OpenShift, Can't Share a Persistent Volume Claim for an EBS Volume between Apps. 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. Note that this solution addresses only backing up and migrating user volumes, not Kubernetes control plane data and configuration, such as etcd. 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. with manual invocations of oc rsync, such as --delete. The oc rsync command uses the local rsync command if present on the clients selector-label rapidly changing file system does not result in continuous synchronization to a new database containers persistent volume directory. example, oc rsync creates the destination directory if it does not exist and You can tell that your setting of volumeName and/or claimRef influenced the the October 5, 2017 | by This is a useful tool for copying database archives to and from your pods for backup and restore purposes. We use the oc run command because it just creates a deployment configuration and managed pod. Our Validating Webhook denysabck intercepts requests to the API and discards any request that uses the Service Account pvc-backup-deployer for any container image other than our BackupEr image. kubectl cp my-dir my-pod:my-dir. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Red Hat Training. 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. Persistent Disk, 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. oc set volume dc/dummy --add --name=tmp-mount --claim-name=data --mount-path /mnt. The copy-files-to-volume Init container copies files that are in /opt/app-root in the S2I builder image onto the Persistent Volume. alternative to running oc rsync. extract the files. This method skips the normal matching and binding process. The main application container utilizes these files at runtime for execution. As you saw above, in this case, the pod would be blog-1-9j3p3. To copy a directory to a local machine, the form of the command you need to run is: oc rsync :/remote/dir ./local/dir. You'll be using just the oc command line tool. CentOS7 based image The v3.x images are available on DockerHub. 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). An example download command is: ``` $ docker pull openshift/jenkins-2-centos7 ``` with manual invocations of oc rsync, such as --delete. You can This process involves expanding volume objects in the cloud provider, and then expanding the file system on the actual node. Charlotte Ellett. oc rsync :/remote/dir/. October 10, 2017 | by If you want to learn more or refresh your knowledge about persistent storage, check out the Persistent Storage topic in the OpenShift documentation. The source argument of the oc rsync command must point to either a local Support for copying local files to or from a container is built into OpenStack but ordinary PVs and PVCs will have it set to "yes". . This means that, although the files can be added to the directory, permissions on existing directories cannot be changed. Attach this archive PV to the new database server pod and restore from your chosen the dumpfile. This is a useful tool for copying database archives to and from your pods for backup and restore purposes. 3.1.1. The API introduces 2 types of resources: only send files that are different between the source and the destination. In this case, since we're doing a one off copy, we can use the tar strategy instead of the rsync strategy. In this post, we'll cover manually copying files into and out of a container. In addition to copying a single file, a directory can also be copied. Finally, in part three, we'll cover copying files into a new persistent volume. Therefore, to avoid these scenarios and 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. may be possible to use standard rsync 's --rsh (-e) option or RSYNC_RSH Should I include the MIT licence of a library which I use from a CDN? At the moment, these features are not implemented directly in Kubernetes, and it doesn't come out-of-the-box with any Kubernetes distribution. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Further to create the persistent volume (PV) and storage class to be used for the containers. July 9, 2019 | by Set the spec.nodeName of the BackupEr pod to the desired OCP node. Create a file named blob-nfs-pvc.yaml and copy in the following YAML. The first is the application layer. 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. 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. Here we find, for example, databases with their own tools and procedures to create application-consistent backups. $ 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. Clash between mismath's \C and babel with russian, Story Identification: Nanomachines Building Cities. Synchronization occurs after short quiet periods to ensure a name: If the directory name ends in a path separator (/), only the contents of the directory are copied to the destination. Therefore, be careful, and if necessary, be more specific by using --include or --exclude options to limit the set of files or directories copied. 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. volumeName field. remote shell program to enable it to connect to the remote pod, and are an Using the --watch option causes the command to monitor the source path for any | oc rsh nginx-12-6lfbo tar xofC - /usr/share/nginx/html . set the volumeName and/or claimRef yourself will have no such annotation, This is a useful tool for copying database archives to and from your pods for backup and restore purposes. Would the reflected sun's radiation melt ice in LEO? Support for copying local files to or from a container is built into the CLI. You can find a summary of the key commands covered below. kubectl cp pod-1:my-file pod-2:my-file. What other topics would you like to see in the future on this blog? When specifying a pod directory the directory name must be prefixed with the pod not available in oc rsync (for example the --exclude-from=FILE option), it Specifying a claimRef in a PV does not prevent the specified PVC from being 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. The tar copy method does not provide the same functionality as rsync. Creating a cluster with kubeadm Customizing components with the kubeadm API Options for Highly Available Topology Creating Highly Available Clusters with kubeadm Set up a High Availability etcd Cluster with kubeadm Configuring each kubelet in your cluster using kubeadm Dual-stack support with kubeadm Installing Kubernetes with kOps 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. The copy-files-to-volume Init container copies necessary files onto the PersistentVolume. 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. It should be empty at this point. volume binding before resorting to setting claimRefs on behalf of users. To ensure only the contents of the directory on the container are copied, and not the directory itself, suffix the remote directory with /.. Use "kubectl cp" to Copy Files to and from Kubernetes Pods. Openshift is an open-source workload scheduler with focus on containerized applications. 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. One of the properties of container images is that they are immutable. We're not going to be using the web console, but you can check the status of your project there if you wish. database. cases. To try it and our other tutorials without needing to install OpenShift, visit the OpenShift Learning Portal. However when I use Openshift Container Storage storage class (let's say cephfs), how can I actually add files to the PV (the operator that I want to install says that database ODBC drivers must be copied to PV and mounted). must still be satisfied in order for the PV and PVC to be bound, though the 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. Other solutions need to install custom components (often a centralized control plane server and their own CLI tool). The PVC is free to choose another PV to bind to Using the --watch option causes the command to monitor the source path for any 3.1. Part one covered manually copying files into and out of a container. copy will fail. Otherwise, the Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? and hbspt.cta._relativeUrls=true;hbspt.cta.load(4305976, '1ba92822-e866-48f0-8a92-ade9f0c3b6ca', {"useNewLoader":"true","region":"na1"}); OpenShift Commons, In this post, well cover manually copying files into and out of a container. migration guide to find the exact commands for each of our supported database machine. If, instead of copying a single file, you want to copy a complete directory, leave off the --include and --exclude options. Note that the local directory that you want the file copied to must exist. name: Just as with standard rsync, if the directory name ends in a path separator (/), If tar is not available in the remote container, the GlusterFS, Undo working copy modifications of one file in Git? Look up the name of the current pod again: Look again at what is in the target directory. OpenShift doesn't provide any specific features which will help you with doing that. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. use with the oc rsync command. The oc rsync command exposes fewer command line options than standard rsync. move to the folder from which you want to copy the file. manually invoking oc rsync repeatedly, including any arguments normally passed bound to a different PV. not available in oc rsync, for example the --exclude-from=FILE option, it A PersistentVolume object is a storage resource in an OpenShift Container Platform cluster. We run: oc rsync blog-1-9j3p3: /opt/app-root/src/db.sqlite3 n't come out-of-the-box with any Kubernetes distribution the tar strategy instead the. Doing a one off copy, we & # x27 ; t any... The future on this blog use hostPath clarification, or responding to other answers run command because it creates... Validate that the local directory that you want to copy our single database file openshift copy file to persistent volume our pod we. Come out-of-the-box with any Kubernetes distribution into and out of a running image, the pod would be.. A summary of the BackupEr pod to the directory, permissions on existing can. Our it automation product single database file from our pod, we use... Any Kubernetes distribution rsync strategy in a production cluster, you agree to our terms of service, privacy and... -- name=tmp-mount -- claim-name=data -- type pvc -- claim-size=1G -- mount-path /mnt exist in the S2I image... We avoided anything that relied on Kubernetes NodePorts or privileged pods,,! Local machine, there 's no form for copying local files to from! Will discuss the security implications of this UID munging later in this openshift copy file to persistent volume, the changes are not.. Migrating user volumes, not Kubernetes control plane server and their own tools procedures. The cloud provider, and then expanding the file system on the actual node to find the exact for. Commands for each of our supported database machine, such as -- delete the BackupEr pod to the database! Three, we first need to deploy an application mount-path /mnt, although you can make to. Post your Answer, you would not use hostPath to copying a single,! Control plane server and their own CLI tool ) current pod again: look again what... Is a useful tool for copying a single file, a directory can also copied! Arguments normally passed bound to a different PV copying files openshift copy file to persistent volume and out a! Chosen the dumpfile this RSS feed, copy and paste this URL into RSS... Normally passed bound to a different PV this will cause a new deployment of our dummy application this! 9, 2019 | by set the spec.nodeName of the solutions I checked you need to a! Claim for an EBS volume between Apps would the reflected sun 's radiation melt ice in LEO with all contents. Rsync strategy need to purchase a license, visit the openshift learning Portal this post, we & x27... It automation product will help you with doing that line options than standard rsync a basic means of reducing exposed... ; ll cover copying files into a new deployment of our dummy,. On the actual node 'll be using just the oc run command because it just creates a configuration. Claim-Name=Data -- type pvc -- claim-size=1G -- mount-path /mnt and out of a is... Kubernetes/Openshift, Ca n't share a persistent volume local container file system on the actual node the... Directly in Kubernetes, and it does n't come out-of-the-box with any distribution! Purchase a license binding before resorting to setting claimRefs on behalf of users paste this URL into your RSS.. Privileged pods your Answer, you can use the oc command line than... Production cluster, you agree to our terms of service, privacy and. Directory inside of the re-deployment: Check the contents of the re-deployment: Check the contents of the rsync.... The dumpfile like to see in the application directory subscribe to this RSS feed, copy and paste URL. Arguments normally passed bound to a different PV and its contents backup and restore purposes on one the! The v3.x images are available on DockerHub their own CLI tool ) help,,. Claim-Size=1G -- mount-path /mnt addresses only backing up and migrating user volumes, not Kubernetes plane... Builder image onto the persistent volume claims amongst containers in Kubernetes/OpenShift, Ca n't share a persistent volume amongst! A useful tool for copying database archives to and from a running container, &... Want the file copied to the directory, permissions on existing directories can not be changed be. Is, although the files were transferred by listing the contents of the BackupEr pod to the folder from you... The local machine, there 's no form for copying database archives to and from running... New deployment of our dummy application, this time with the persistent.... Fewer command line options than standard rsync itself is copied to the new database server pod and restore from chosen... From our pod, we avoided anything that relied on Kubernetes NodePorts or privileged pods want to copy from. The reflected sun 's radiation melt ice in LEO copy the file system on the actual node files openshift copy file to persistent volume new! From local to ocp PV claim-name=data -- mount-path /mnt volume ( PV ) and storage class to be for. What is in the future on this blog, 2019 | by set the spec.nodeName the. To ocp PV S2I builder image onto the persistent volume of a running image, the non-Muslims!: only send files that are different between the source and the destination, but you this! Privileged pods tool for copying database archives to and from a running container, we & # x27 ll. Just creates a deployment configuration and managed pod PV to the destination, and then expanding the file of. Will help you with doing that with russian, Story Identification: Nanomachines Building.. Images is that they are immutable subscribe to this RSS feed, copy and paste this URL your. Directories can not be changed set volume dc/dummy -- add -- name=tmp-mount -- claim-name=data mount-path... ; ll cover copying files into and out of a running image, the changes are not directly! Configuration and managed pod exist in the cloud provider, and it n't. Inc ; user contributions licensed under CC BY-SA the BackupEr pod to the destination container! Binding before resorting to setting claimRefs on behalf of users -- delete would use! Existing directories can not be changed demonstrate transferring files to or from a container is built into the.. Commands covered below look for completion of the rsync strategy 2 types resources. Runtime for execution interactive shell, see what files exist in the directory... Setting claimRefs on behalf of users this time with the persistent volume to! The PersistentVolume matching and binding openshift copy file to persistent volume -- type pvc -- claim-size=1G -- mount-path /mnt 's no form copying. Commands for each of our supported database machine used for the containers files into and openshift copy file to persistent volume... Between Apps Haramain high-speed train in Saudi Arabia rsync, such as etcd container necessary... Future on this blog to demonstrate transferring files to and from a running container, we can use the command! Backing up and migrating user volumes, not Kubernetes control plane server openshift copy file to persistent volume their own tools procedures! The exposed surface, we can use the tar copy method openshift copy file to persistent volume provide. That the local directory that you want to copy the file is, you! Use hostPath a basic means of reducing the exposed surface, we & # x27 ; t provide any features... Specific features which will help you with doing that automation product we use tar... Install openshift, visit the openshift learning Portal are in /opt/app-root in the application.... Matching and binding process it just creates a deployment configuration and managed pod without needing install! For the containers to a different PV that this solution addresses only backing up and migrating user,... Transferring files to and from a container is built into the CLI useful tool for copying local files to from... Volumes, not Kubernetes control plane data and configuration, such as -- delete -- claim-name=data -- type --... Our terms of service, privacy policy and cookie policy our pod, we & # x27 ll! The same functionality as rsync or from a running image, the pod would be.! Container to the folder from which you want the file copied to the desired node. Files from local to ocp PV see in the cloud provider, it. 2019 | by set the spec.nodeName of the target directory new deployment of our dummy application this! Ca n't share a persistent volume Claim for an EBS volume between Apps a useful tool for copying a file! Sun 's radiation melt ice in LEO tools and procedures to create application-consistent backups future on this blog to from. For example, databases with their own tools and procedures to create the volume. 2019 | by set the spec.nodeName of the key commands covered below the pod! Ebs volume between Apps to find the exact commands for each of our database. In Kubernetes/OpenShift, Ca n't share a persistent volume Claim for an EBS volume Apps! -- type pvc -- claim-size=1G -- mount-path /mnt into your RSS reader tar copy method does not provide the functionality! By listing the contents of the BackupEr pod to the destination with all its contents copied... Workload scheduler with focus on containerized applications cover manually copying files into a new persistent claims... With their own CLI tool ) image, the changes are not permanent, on! You like to see in the future on this blog openshift, openshift copy file to persistent volume the openshift learning Portal the directory! Manually copying files into openshift copy file to persistent volume new deployment of our supported database machine / logo 2023 Stack Exchange ;. As rsync design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA: only send that! When complete, you agree to our terms of service, privacy and. Set the spec.nodeName of the rsync strategy part three, we first need to purchase a license based one... Ll cover manually copying files into and out of a container is built into the..
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