Etcd reset cluster If you run etcd as static pods on your master nodes, you stop the etcd pods, create a temporary cluster, and then restart the etcd pods. 21. 30. brandond opened this issue Sep 28, 2022 · 3 comments Oct 15, 2024 · Restoring etcd from a backup is necessary when recovering from a failure or corruption. If you used cloud-config to configure your discovery token, peer addrs, etc, you will need to update your cloud-config file with the new clustering info and new token. node. Perform the cluster reset through the first cluster node: rke2 server Sep 14, 2023 · If the etcd member removal annotation is used to prepare a node for deletion from the cluster, and the annotation is set at the time an etcd snapshot is taken, the node can attempt to re-remove itself from the cluster after a reset or re Jun 7, 2020 · In this tutorial, we will learn about how to reset single node/control-plane Kubernetes Cluster. For example: May 14, 2021 · $ curl https://get. However, if this is a single-node cluster used for testing purposes, a graceful reset is not an option since etcd cannot be “left” if there is only a single member. sh $ sudo chmod +x install-"k3s". sh $ sudo groupadd --system etcd && sudo useradd -s /sbin/nologin --system -g etcd etcd $ sudo modprobe ip_vs_rr $ sudo modprobe ip_vs_wrr $ sudo modprobe ip_vs_sh $ sudo printf "on_oovm. An etcd cluster automatically recovers from temporary failures (e. 20. panic_on_oops=1 \n" > ~/90-kubelet. panic=10 \nkernel. etcd-snapshot-schedule-cron value. When a member permanently fails, whether due to hardware failure or disk corruption, it loses access to the cluster. Connect to an etcd node through SSH. cluster-reset-restore-path: Path to snapshot file to be restored: etcd-expose-metrics: Expose etcd metrics to client interface. g. false: etcd-disable-snapshots: Disable automatic etcd snapshots: etcd-snapshot-name: Set the base name of etcd snapshots: etcd-snapshot-<unix-timestamp>) etcd-snapshot-schedule-cron Mar 26, 2024 · --cluster-init tells the server to initialize a new etcd cluster. This procedure is the primary method for restoring etcd in RKE2, and it is essential to always refer to the official Rancher documentation for detailed instructions and recommendations. kubeadm reset phase can be used to execute the separate phases of the 在本节中，你将学习如何创建 K3s 嵌入式 etcd 数据存储的备份，以及如何使用备份恢复集群。 创建快照 . to. Jun 18, 2024 · etcdctl can be used to create a backup of the etcd cluster by taking a snapshot of the current state of the cluster. Stop the etcd Service. Inspect available parameters. Environmental Info: rke2 version v1. 8. Forget all peers and become sole member of a new cluster. Stop rke2-server on all master nodes systemctl stop rke2-server 3. The first step is to stop the RKE2 server on all nodes: systemctl stop rke2-server. English; 简体中文; Demo →. every 4 hours 0 */4 * * *. Before restoring, stop the etcd service on the control plane node: sudo systemctl stop etcd Restore the Snapshot. Be aware, that I don't have ssl enabled at this point! Cluster Configuration: The cluster consists of 2 etcd nodes, and i want to add a third one, before i add the agent nodes. sudo systemctl stop kubelet Apr 7, 2023 · INFO[0057] Managed etcd cluster membership has been reset, restart without --cluster-reset flag now. At this point, the etcd data should be recovered, and the surviving etcd member should be able to start. Admin Kubeconfig Options. " I generated a new discovery id for the cluster. You may need to shut down and restart workload clusters to accommodate planned outages for network maintenance or planned network downtime. To skip a list of phases you can use the --skip-phases flag, which works in a similar way to the kubeadm join and kubeadm init phase runners. Kubeadm Reset. kubeadm reset is responsible for cleaning up a node local file system from files that were created using the kubeadm init or kubeadm join commands. , machine reboots) and tolerates up to (N-1)/2 permanent failures for a cluster of N members. Actual behavior: rke2 doesn't appear to attempt to reset etcd and instead starts as normal: Apr 29, 2021 · stop rke2-server and attempt to reset cluster to a single-node cluster on the initial node with rke2 server --cluster-reset; Expected behavior: Cluster should come back as a single-node cluster using existing etcd data. Jun 22, 2022 · processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 85 model name : Intel(R) Xeon(R) Silver 4214R CPU @ 2. Same steps which are mentioned below could be also performed on any Kubernetes cluster created on Ubuntu Apr 8, 2025 · rke2 server \ --cluster-reset \ --cluster-reset-restore-path=<SNAPSHOT-NAME> To restore from a local snapshot file when an etcd-s3 backup configuration is defined, use the --etcd-s3=false flag and provide the full path to the snapshot file in the --cluster-reset-restore-path argument. 40GHz stepping : 7 microcode : 0x500320a cpu MHz : 2400. Follow these steps to restore your etcd cluster from a snapshot. 本页介绍了使用k3s etcd-snapshot CLI 管理 etcd 快照的方法，以及为k3s server 进程配置 etcd 定期快照，以及使用k3s server --cluster-reset 命令重置 etcd 集群成员资格并可选地恢复 etcd 快照。 Reset workflow. --cluster-reset performs a minimal start up of the Feb 11, 2023 · Rancher Server Setup Rancher version: 2. Steps to the following: We can get the ETCD cluster information from the default location: STEP-1: First, we need to check the ETCD health in the Jan 23, 2025 · etcd is a consistent and highly-available key value store used as Kubernetes' backing store for all cluster data. 0. There is a way out of this situation. Thus, to create a snapshot of the current etcd cluster state, use the etcdctl command as All etcd nodes in the cluster receive a plan to create an etcd snapshot, per the cluster configuration. K3S_CLUSTER_RESET. Use the etcdctl snapshot restore command to restore the Jun 5, 2022 · To be able to install a new K3S on a different server and restore from the backup we have on the S3 bucket, we will have to use the --cluster-reset and --cluster-reset-restore-path specifying the backup, together with all the other --etcd-s3 options to set the backup we want to restore from: Sep 10, 2024 · Ensure etcd and etcdctl is installed. 52 - working dk1k8s07 / 192. io --output install-"k3s". panic_on_oom=0 \nvm. You should clean it up to avoid restoring previous cluster configuration. Go to the cluster in the Rancher Cluster Manager view; Go to the action menu in the top right corner; Select Restore Snapshot; Select the etcd snapshot that you found in the previous steps Dec 5, 2022 · 文章浏览阅读9. Apr 26, 2021 · A restore initializes a new member of a new cluster, with a fresh cluster configuration using etcd’s cluster configuration flags, but preserves the contents of the etcd keyspace. etcd, m3. Oct 18, 2023 · We currently have an empty etcd cluster on our temporary master nodes. ETCD Info: Snapshots are composed of the cluster data in etcd, the Kubernetes version, and the cluster configuration in the cluster. These components allow you to select from the following options when restoring a cluster from a snapshot: Restore just the etcd contents: This restore is similar to restoring to snapshots in Rancher before v2. elect for leader election: The etcdctl command is used to conduct leader elections in an etcd cluster. panic_ps=1 \nkernel. This guide walks you through the complete Mar 5, 2021 · Sometimes it happens that you have lost most of the nodes from the cluster and etcd went into an inoperative state. Continuing from the previous example, the following creates new etcd data directories (m1. Jul 2, 2019 · So yes, basically when you create a single control-plane cluster using kubeadm - you are installing cluster that has single control-plane node, with a single etcd database running on it. ETCD Restoration. Dec 17, 2024 · To remove nodes from a Talos Linux cluster: talosctl -n <IP. conf Oct 18, 2023 · The etcd cluster join failed: duplicate node name found message looks like as if the reset wasn't completely/correctly done. Feb 21, 2024 · Reset Kubernetes cluster node. So, we need to restore the etcd snapshot we found in this node’s previous steps. 9+rke2r1). Backup and delete ${datadir}/server/db on each peer etcd server and rejoin the nodes Nodes joined cluster and cluster reset is successful Oct 1, 2021 · You signed in with another tab or window. Start the RKE2 service on the surviving etcd member. The majority Jan 15, 2025 · For control-plane nodes reset also removes the local stacked etcd member of this node from the etcd cluster. For control-plane nodes reset also removes the local stacked etcd member of this node from the etcd cluster. Check for active etcd cluster. Without relying on other third-party tools, this article documents the process of restoring the cluster using regular ETCD backups. 7 Installation option (Docker install/Helm Chart): If Helm Chart, Kubernetes Cluster and version (RKE1, RKE2, k3s, EKS, etc): Proxy/Cert Details: almalinux 9. yml. It is highly recommended to always have a cluster size greater than two in production. You switched accounts on another tab or window. Backup and delete ${datadir}/server/db on each peer etcd server and rejoin the nodes May 4, 2022 · When performing a cluster-reset without cluster-reset-restore-path flag, then trying to rejoin server nodes, the cluster ends up with a split brain situation. Before you begin Before you follow steps in this page to deploy, manage, back up or restore etcd Apr 11, 2024 · etcd is designed to withstand machine failures. Options Description; etcd-disable-snapshots. Create a KubeSphere Cloud account and log in to the platform. Jul 11, 2020 · [y/N]: y [preflight] Running pre-flight checks [reset] Removing info for node "k8s-master" from the ConfigMap "kubeadm-config" in the "kube-system" Namespace [reset] failed to remove etcd member: etcdserver: re-configuration failed due to not enough started members. Th May 16, 2025 · This topic explains how to shut down and restart workload clusters, and how to delete them. The default etcd directory used by kubeadm is /var/lib/etcd on the control-plane node. 默认情况下，快照在系统时间 00:00 和 12:00 启用，会保留 5 个快照。 If you run etcd on a separate host, you must back up etcd, take down your etcd cluster, and form a new one. Then I teared down the old cluster completely, by deleting all content of /var/lib/etcd/* and the directory /var/lib/etcd2 completely and (re-)started the etcd-member service. 4. 51 - working (current holder of the Keepalived VIP) dk1k8s02 / 192. dk1k8sclu01 / 192. k3s. Reset the cluster and restore the etcd database From one of the master nodes, execute the following command to reset the cluster and restore the etcd Nov 13, 2024 · With the previous RKE2 binary installed on all cluster nodes, the next step is to restore an etcd snapshot taken whilst the cluster was still running this previous RKE2 version (in this example v1. Dec 17, 2024 · Before starting a disaster recovery procedure, make sure that etcd cluster can’t be recovered: get etcd cluster member list on all healthy control plane nodes with talosctl -n IP etcd members command and compare across all members. You signed out in another tab or window. 50 - vip / keepalived dk1k8s01 / 192. In the upper-right corner, click Console, and then click Lite Cluster on the left. kubeadm reset phase can be used to execute the separate phases of the above workflow. Aug 18, 2021 · etcd comes with support for incremental runtime reconfiguration, which allows users to update the membership of the cluster at run time. eg. The snapshot captures the data and metadata of the entire etcd cluster at a specific point in time and are typically stored as binary files. etcd) for a three member cluster: May 7, 2015 · Removing all files in that directory will reset etcd, including clustering info. Shut Down and Restart Workload Clusters. It makes sure that only one client become leader at a time. 0-dev+e8b3547b Node(s) CPU architecture, OS, and Version: Ubuntu 20. I saw this issue multiple time but not always, so clearly sporadic Find attached the Rancher Manager logs as well as the k3s ones on the failing node (at least the logs I was able to generate, as k3s is not running). This command usually takes a few minutes to complete. Dec 5, 2024 · What does the etcd warning “request ignored (cluster ID mismatch)” mean? Every new etcd cluster generates a new cluster ID based on the initial cluster configuration and a user-provided unique initial-cluster-token value. You can use one healthy etcd node to form a new cluster, but you must remove all other healthy nodes. 000 cache size : 16896 KB physical id : 0 siblings : 24 core id : 0 cpu cores : 12 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 22 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep Sep 28, 2022 · Cluster fails to come up after rke2 cluster-reset on etcd-only node due to leftover etcd container #3387. You just need to edit the static manifest file and add the --force-new-cluster key to etcd: In this instance only the snapshot filename should be passed in the argument --cluster-reset-restore-path. The phase is set to RestartCluster, and the plans on every etcd node are reset to the original plan for the etcd nodes. Snapshot interval time in cron spec. $ sudo kubeadm reset --help Performs a best effort revert of changes made to this host by 'kubeadm init' or 'kubeadm join' The "reset" command executes the following phases: ``` preflight Run reset pre-flight checks remove-etcd-member Remove a local etcd member. Run the following command to stop kubelet. Flag Initialize a new cluster using embedded Etcd--cluster-reset: K3S_CLUSTER_RESET: Forget all peers and become sole member of a new cluster: Admin Kubeconfig Options . Oct 11, 2023 · This will reset the etcd cluster and remove the other etcd members from the etcd cluster but not from the Kubernetes cluster. 5 Installation option (Docker install/Helm Chart): If Helm Chart, Kubernetes Cluster and version (RKE1, RKE2, k3s, EKS, etc): Docker install Proxy/Cert Details: N/A Information about the Cluster If you delete an etcd node from Kubernetes, the node will be removed from the etcd cluster. If the cluster permanently loses more than (N-1)/2 members then it Jan 25, 2013 · On the server that is reset, etcd is still running following the cluster-reset, and is restarted by static pod sync to remove the force-new-cluster option from the config. Apr 26, 2021 · etcd is designed to withstand machine failures. 1. 执行备份恢复时，用户不需要使用创建快照时使用的 RKE2 版本。用户可以使用更新的版本进行恢复。如果你在恢复时更改版本，请注意正在使用哪个 etcd 版本。 This page documents the management of etcd snapshots using the k3s etcd-snapshot CLI, as well as configuration of etcd scheduled snapshots for the k3s server process, and use of the k3s server --cluster-reset command to reset etcd cluster membership and optionally restore etcd snapshots. 53 - faulty Initialize a new cluster using embedded Etcd--cluster-reset. It is unsafe to remove a member from a two member cluster. It will wipe out Kubernetes cluster data that was configured using kubeadm init as described in Create single node Kubernetes cluster on Ubuntu using kubeadm on Google Cloud Platform (GCP). remove> reset; kubectl delete node <nodename> The command talosctl reset will cordon and drain the node, leaving etcd if required, and then erase its disks and power down the system. Disable automatic etcd snapshots. overcommit_memory=1 \nkernel. If your Kubernetes cluster uses etcd as its backing store, make sure you have a back up plan for the data. You can find in-depth information about etcd in the official documentation. k3s etcd-snapshot. Please manually remove this etcd member using etcdctl [reset] Stopping the May 8, 2024 · Cluster Reset. If you end up with an unhealthy etcd cluster, starting rke2 with just --cluster-reset will knock the cluster back down to just one etcd member, after which you can remove the datastore files and restart the other nodes to re-add them to etcd. 9k次，点赞9次，收藏31次。因k8s集群故障，无法恢复，所以进行重置k8s集群。K8S集群重新初始化。_kubectl reset 在 RKE2 中，快照存储在每个 etcd 节点上。如果您有多个 etcd 或 etcd + control-plane 节点，您将拥有多个本地 etcd 快照副本。 在 RKE2 运行的时候，你可以使用 etcd-snapshot 子命令来手动获取快照，例如 rke2 etcd-snapshot save --name pre-upgrade-snapshot。 Apr 29, 2021 · stop rke2-server and attempt to reset cluster to a single-node cluster on the initial node with rke2 server --cluster-reset; Expected behavior: Cluster should come back as a single-node cluster using existing etcd data. 04 Describe the bug: After restore path is passed we dont see the cluster-reset in the console when cluster-reset-restore-path. of. By having unique cluster ID’s, etcd is protected from cross-cluster interaction which could corrupt the cluster. Reconfiguration requests can only be processed when a majority of cluster members are functioning. Jan 22, 2025 · ETCD Backup. This page documents the management of etcd snapshots using the k3s etcd-snapshot CLI, as well as configuration of etcd scheduled snapshots for the k3s server process, and use of the k3s server --cluster-reset command to reset etcd cluster membership and optionally restore etcd snapshots. You will need to do this on all of your nodes and then re-cluster everything. "If you ever drop your keys into a river of molten lava, let 'em go, because man, they're gone. Aug 19, 2023 · For best results if an etcd database restore is really needed, the etcd restore part with the --cluster-reset option should be done on the same master node as it is also explained bellow. Jan 22, 2025 · When running ETCD as a system service in your Kubernetes cluster, the backup and restore process requires specific handling of the service configuration. If you set up your Kubernetes cluster through other methods, you may need to perform the following steps. ``` Usage: kubeadm reset [flags] kubeadm Feb 15, 2025 · If the machine is part of an HA cluster, a normal, graceful reset should work fine as long as the cluster is in a good state. Taking an etcd backup To take a one-time backup in an RKE2 cluster, run the following command: rke2 etcd-snapshot save 2. RKE2 enables a RKE2 will then attempt to restore the snapshot by creating a new data directory and start etcd with a new RKE2 cluster with one etcd Mar 23, 2023 · INFO[0060] Tunnel server egress proxy waiting for runtime core to become available INFO[0063] Managed etcd cluster membership has been reset, restart without --cluster-reset flag now. etcd, m2. Jul 28, 2024 · Rancher Server Setup Rancher version: v2. To restore from a local snapshot file, where an etcd-s3 backup configuration is present, add the argument --etcd-s3=false and pass the full path to the local snapshot file in the argument --cluster-reset-restore-path. 168. Feb 27, 2024 · Recently encountered issues with the K8S cluster. You’ll not be able to remove or add new members to the cluster and create snapshots as well. Ensure the ENDPOINTS variable is set with the addresses of each etcd cluster members. If there are existing etcd datastore files on disk, this flag is ignored, as the cluster has already been initialized. 2. This interrupts the just-started apiserver, and various rke2 embedded controller operations (such as registering CRDs) fail after a few seconds. 1 fresh system bare metal podman, also Mar 17, 2022 · For a Kubernetes cluster deployed by kubeadm, etcd runs as a pod in the cluster and you can skip this step. query etcd health across control plane nodes with talosctl -n IP service etcd. Reload to refresh your session. cleanup-node Run cleanup node. The phase is set to Finished. Actual behavior: rke2 doesn't appear to attempt to reset etcd and instead starts as normal: Sep 20, 2023 · 然后 K3s 将尝试通过创建一个新的数据目录来恢复快照，然后使用具有一个 etcd 成员的新 K3s 集群启动 etcd。 使用备份恢复集群： 单服务器; 高可用; 使用 --cluster-reset 选项运行 K3s，同时指定 --cluster-reset-restore-path： k3s server \--cluster-reset \--cluster-reset-restore-path Jul 19, 2023 · 1. rifjg cljic ebngm row rysdjdq zjich hjkfy qhmri hxvs mmc