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RKE ETCD Plugin

Introduction to ETCD

Etcd is the persistent data store for Kubernetes. It is a distributed key-value store that records the state of all resources in a Kubernetes cluster. Etcd is a distributed reliable key-value store which is simple, fast and secure. It acts like a backend service discovery and database, runs on different servers in Kubernetes clusters at the same time to monitor changes in clusters and to store state/configuration data that should to be accessed by a Kubernetes master or clusters.

RKE Cluster Backup & Disaster Recovery (DR)

RKE clusters can be configured to take snapshots of etcd. In a disaster scenario, you can restore these snapshots. This snapshots can be shared outside cluster like s3 storage so that in case if we loose server, we will have backups to restore.

ETCD backup and restore using rke-etcd-backup-restore

The plugin helps user to perform ETCD backup and restore of RKE1 clusters and enables the user to store the snapshot on s3 storage created using TVK target.

Important Notes & Plugin Prerequisites

Important notes for the plugin
Prerequisites

Installation, Upgrade, Removal of Plugins

With krew
Without krew
  • Add TVK custom plugin index of krew:
    kubectl krew index add tvk-interop-plugin https://github.com/trilioData/tvk-interop-plugins.git
  • Installation:
    kubectl krew install tvk-interop-plugin/rke-etcd-backup-restore
  • Upgrade:
    kubectl krew upgrade rke-etcd-backup-restore
  • Removal:
    kubectl krew uninstall rke-etcd-backup-restore
  1. 2.
    Choose a version of preflight plugin to install and check if release assets have preflight plugin's package[rke-etcd-backup-restore-${OS}.tar.gz]
  2. 3.
    To check OS & Architecture, execute command uname -a on linux/macOS
  3. 4.
    Set env variable TVK_RKE_ETCD_BACKUP_RESTORE_VERSION=v1.x.x [update with your desired version]. If TVK_RKE_ETCD_BACKUP_RESTORE_VERSION is not exported, latest tagged version will be considered.

Linux/macOS

Bash or ZSH shells:
(
set -ex; cd "$(mktemp -d)" &&
OS="$(uname)" &&
if [[ -z ${TVK_RKE_ETCD_BACKUP_RESTORE_VERSION} ]]; then version=$(curl -s https://api.github.com/repos/trilioData/tvk-interop-plugins/releases/ | grep -oP '"tag_name": "\K(.*)(?=")'); fi &&
echo "Installing version=${TVK_RKE_ETCD_BACKUP_RESTORE_VERSION}" &&
package_name="rke-etcd-backup-restore-${OS}.tar.gz" &&
curl -fsSLO "https://github.com/trilioData/tvk-interop-plugins/releases/download/"${TVK_RKE_ETCD_BACKUP_RESTORE_VERSION}"/${package_name}" &&
tar zxvf ${package_name} && sudo mv rke-etcd-backup-restore /usr/local/bin/kubectl-rke_etcd_backup_restore
)
Verify installation with: kubectl rke-etcd-backup-restore --help

Usage

ETCD Backup and restore on Rancher cluster. Available flags: -backup -restore.
[-h] [-backup] [-restore] [--target-name TARGET_NAME]
[--target-namespace TARGET_NAMESPACE] --rancher-url RANCHER_URL
--bearer-token BEARER_TOKEN --cluster-name CLUSTER_NAME
[--log-location LOG_LOC]

Arguments/Flags:

Parameter
Description
-backup
Flag to notify backup is to be taken.
-restore
Falg to notify restore is to be performed.
--target-name
The name of a single datastore on which etcd backup needs to be stored i.e. TVK target name.
--target-namespace
Namespace name in which TVK target is created.
--rancher-url
Rancher server URL
--bearer-token
Token to access rancher server More info here
--cluster-name
Cluster name to perform Backup/Restore on.
--log-location
Log file name along with path where the logs should be save default - /tmp/etcd-ocp-backup.log

Arguments Details:

  • -backup: Flag to notify the plugin to perform backup.
  • -restore: Flag to notify the plugin to perform restore.
  • --target-name: TVK target name.The target should be created and in available state. Currently S3 target type is supported. This target should be the target where the backups should be stored. This argument is mandatory if -backup flag is provided.
  • --target-namespace: Namespace name in which TVK target resides. This argument is mandatory if -backup flag is provided.
  • --rancher-url: This is the rancher server URL through which rancher can be accessed. should be given in the below form: "https://<rancher server ip>/" This is the URL to access rancher server. This is mandatory argument.
  • --bearer-token: This is the token provided by rancher server to access its cluster/apis without using password. More info about how to get bearer-token can be found at https://rancher.com/docs/rancher/v2.5/en/user-settings/api-keys/ The scope of API key should be "No scope" as to access API's, plugin needs access to complete scope of Rancher server This is mandatory argument.
  • --cluster-name: Rancher server hosts many RKE cluster, so specify the one cluster name for which ETCD backup is to be taken. This is mandatory argument.
  • --log-location: specify the log file location. default: /tmp/etcd-ocp-backup.log

Examples:

A user may specify more than one option with each command execution. For example, to create a backup with a configured target name and associated namespace, and to set the cluster API URL with the associated bearer token, execute the following single command:
kubectl rke-etcd-backup-restore -backup --target-name <target-name> --target-namespace <target-namespace> --rancher-url <https://rancher server ip/> --bearer-token <bearer_token> --cluster-name <cluster_name>
Then, to restore from the same cluster API URL with the associated bearer token, execute the following single command:
kubectl rke-etcd-backup-restore -restore --rancher-url <https://rancher server ip/> --bearer-token <bearer_token> --cluster-name <cluster_name>
Restoring to a previous cluster state can be destructive and destabilizing action to take on a running cluster.

Important Additional Information

  1. 1.
    If restoring the backup which is a different TVK version than the one you are currently using, the operation fails and cluster accessibility is lost. The workaround is to delete the current TVK and then re-try restoring.
  2. 2.
    Supported GLIBC version 2.27.
  3. 3.
    Plugin is tested with RKE1 with kubernetes version v1.21.9.