When I want to restore, where do I put the backup file so that I can be restored or how to tell etcdctl to restore from a specific path? Backup and Restore etcd in Kubernetes Cluster for CKA v1.19, Planning the Hardware Requirements for the VMware Cloud Foundation Management Domain, CKA 2020 Curriculum for Kubernetes v1.19 | Brandon Willmott, Important Directories to Know for Kubernetes CKA Exam | Brandon Willmott, https://jira.linuxfoundation.org/plugins/servlet/theme/portal/15/create/324, Restoring the etcd snapshot to the /var/lib/etcd-from-backup directory, Re-initializing the etcd cluster token since we are creating a new cluster, Specifying the IP:Port for etcd-to-etcd communication. sudo ETCDCTL_API=3 etcdctl snapshot restore /home/cloud_user/etcd_backup.db Offsite could be object storage in public or private clouds or storage available on prem in different regions or failure domains. When you type the etcd backup command, you’re going to need to specify the location of a few certificates and a key. Hi Satya, while I think it’s technically possible, I don’t think that will pass for the exam since etcd should only run on control plane nodes, they will likely be looking to see if the file was restored to the control plane node. You might have to get your hands dirty if you are running Kubernetes on Baremetal, just like we are. The advantage of external etcd mode is that you can use dedicated data backup and restore strategies separate from the Kubernetes control plane component nodes. Enough, let’s dive into the technical details! If you want to take a backup of the ETCD service running on a different machine, you will have to provide the correct endpoint to that server (which is the IP Address and port of the etcd server with the --endpoint argument) The Certs are provided in question, but the certs within the existing etcdl pod are definition are quite different. Star 0 Fork 0; Star Code Revisions 5. Let’s quickly perform the actions we need to complete this step for the exam. However, in production you wouldn’t want to stop here since this process doesn’t modify the existing etcd pod in anyway. However, Kubernetes v1.19 ships with etcd 3.4.9 and in etcd 3.4.x, the default API version is 3 so this process is no longer necessary! Change ), You are commenting using your Twitter account. To make use of etcdctl for tasks such as back up and restore, make sure that you set the ETCDCTL_API to 3. –endpoints=https://etcd1:2379 But after restore with the certs provided, the etcdl pod on control plane started crashing. A complete guide on how to setup … As mentioned previously, we need to backup etcd. Let’s see how to do first – backup etcd in two basic and easy ways. You can do this by exporting the variable ETCDCTL_API prior to using the etcdctl client. ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key snapshot save /tmp/snapshot-pre-boot.db, ETCDCTL_API=3 etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt If you want to roll back, it’s actually the same process. –cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key Backups are done often to protect from system failure or complete … go (14,761)swift (7,649)kubernetes (1,713)aws (1,073)backup (196)gcp (126)etcd (83)restore (39) Repo. Backup and recovery for Kubernetes is focused on the backup of the entire application from the local Kubernetes cluster to somewhere offsite. With a restore, we’re going to specify those same 4 parameters from the backup operation but add a few more that are needed to initialize the restore as a new etcd store: For the CKA exam, this is all that’s necessary to complete the task! I have the similar question regarding this ETCD restore . Here’s how they map: Your backup command should look like this: That’s it! can we restore etcd using pem format cert and keys? Stars. Backups can capture subsets of the cluster’s resources, filtering by namespace, resource type, and/or label selector, providing a high degree of flexibility around what’s backed up and restored. sudo chown -R etcd:etcd /var/lib/etcd, Verify the system is working: This can be done as follows: If etcdctl version returns a version lower than 3.4.x, you will still need to set the API version to 3 for performing backup and restore operations. Hi I remember that there was no context given. The views and opinions expressed on this blog are my own and do not reflect the views and opinions of my employer. How can I solve the task without a context? Backup and restore using legacy etcd ¶ Volume backups ¶ If you are running your cluster in legacy etcd mode (without etcd-manager), backups can be done through snapshots of the etcd volumes. –name=master Back up your cluster’s etcd data regularly and store in a secure location ideally outside the OpenShift Container Platform environment. While it’s still early and details of the CKA v1.19 environment aren’t known yet, I’m anticipating a small change to how etcd backup and restore is performed. Etcd in Rancher 1.6. apache-2.0. Please excuse me if this is obvious, but new with kubernetes. Open Issues. In production you would need to tell etcd about the new data-dir but the exam doesn’t ask you to do that. –initial-cluster-token=etcd-cluster-1 \ I checked twice and was not there which is strange, That is very odd, Youssef. While this solution address application level backups issue, it’s manual an requires additional tooling to automate; Also application data backups are not possible; Storing in all kubernetes manifests in Git before applying. Above steps looks good, are you facing any issue? Hi Biswanath, the etcd restore step on the exam can be performed without modifying the existing etcd pod. –initial-advertise-peer-urls=https://127.0.0.1:2380 And between the two nodes it’s difficult to understand which endpoint to use? You just destroy your newly updated cluster, start up a cluster on the old version, and restore to it. Kublr implements the full cluster backup procedure described in the Backup section. The final module of the Cluster Architecture, Installation, and Configuration is Implement etcd backup and restore. The options --cert, --cacert and --key are mandatory to authenticate to the ETCD server to take the backup. If you have any questions or comments about what you’ve seen here, we’d love to hear from you! In production, you would modify the etcd pod’s manifest in /etc/kubernetes/manifests/etcd.yaml to utilize the new data directory and the initial cluster token. Take a snapshot backup and save it to a different directory : ETCDCTL_API=3 etcdctl --endpoints=https://[127.0.0.1]:2379 \, –cacert=/etc/kubernetes/pki/etcd/ca.crt \, –cert=/etc/kubernetes/pki/etcd/server.crt \, –key=/etc/kubernetes/pki/etcd/server.key \, snapshot restore /opt/snapshot-pre-boot.db, Powered by Discourse, best viewed with JavaScript enabled. The etcd database is backed up and we’re ready to restore! Backup and Restore etcd in Kubernetes Cluster for CKA v1.19. Do not take an etcd backup before the first certificate rotation completes, which occurs 24 hours after installation, otherwise the backup will contain expired certificates. Users of managed Kubernetes offerings often do not have access to the underlying etcd database, so direct backups/restores of it are not possible. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. You can perform the etcd data backup process on any master host that has connectivity to the etcd cluster, where the proper certificates are provided. You can find in-depth information about etcd in the official documentation. They’re close enough to match up. Etcd-backup-restore is collection of components to backup and restore the etcd. You will also be able to check it by viewing the logs with kubectl logs
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