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backup_service.md

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Backup service

A backup service will be created if the etcd cluster has backup enabled. The backup service saves backup for the etcd cluster based on the requirement of the backup spec.

The backup service will skip creating a new snapshot if the etcd cluster revision has not changed since the last snapshot, i.e the etcd-cluster data has not been modified (e.g., Put, Delete, Txn).

It also exposes an HTTP API for requesting a new backup and retrieving existing backups. The HTTP API can be accessed from inside the kubernetes cluster as:

$ curl "http://<cluster-name>-backup-sidecar:19999/v1/<command>

HTTP API v1

GET /v1/backupnow

The backup service requests a backup from the etcd cluster immediately when it receives the GET request.

Response Body

JSON format of the backup status when backup is successful.

type BackupStatus struct {
    // Creation time of the backup.
    CreationTime string `json:"creationTime"`

    // Size is the size of the backup in MB.
    Size float64 `json:"size"`

    // Version is the version of the backup cluster.
    Version string `json:"version"`

    // TimeTookInSecond is the total time took to create the backup.
    TimeTookInSecond int `json:"timeTookInSecond"`
}

GET /v1/backup

The backup service returns the most recent backup in the body of the HTTP response when it receives the GET request.

Request Parameters

  • etcdVersion (optional): backup service checks the compatibility between the latest backup and the etcd server with passed in etcdVersion. For example, if we want to get a backup for etcd server 3.1.0, we should set etcdVersion to 3.1.0. Backup service will check the if its latest backup can be used to restore a 3.1.0 etcd cluster.

  • etcdRevision (optional): when both etcdVersion and etcdRevision are provided, a backup with revision equal to etcdRevision and taken from the etcd cluster with version equal to etcdVersion will be returned.

Response Headers

  • X-etcd-Version: the etcd cluster version tht the backup was made from
  • X-Revision: the etcd store revision when the backup was made

GET /v1/status

The backup service returns the service status in JSON format. The JSON payload is defined in pkg backapi.ServiceStatus.