112 lines
4.2 KiB
Markdown
112 lines
4.2 KiB
Markdown
---
|
|
layout: api
|
|
page_title: Snapshot - HTTP API
|
|
sidebar_current: api-snapshot
|
|
description: |-
|
|
The /snapshot endpoints save and restore Consul's server state for disaster
|
|
recovery.
|
|
---
|
|
|
|
# Snapshot HTTP Endpoint
|
|
|
|
The `/snapshot` endpoints save and restore the state of the Consul
|
|
servers for disaster recovery. Snapshots include all state managed by Consul's
|
|
Raft [consensus protocol](/docs/internals/consensus.html).
|
|
|
|
## Generate Snapshot
|
|
|
|
This endpoint generates and returns an atomic, point-in-time snapshot of the
|
|
Consul server state.
|
|
|
|
Snapshots are exposed as gzipped tar archives which internally contain the Raft
|
|
metadata required to restore, as well as a binary serialized version of the
|
|
Consul server state. The contents are covered internally by SHA-256 hashes.
|
|
These hashes are verified during snapshot restore operations. The structure of
|
|
the archive is internal to Consul and not intended to be used other than for
|
|
restore operations. The archives are not designed to be modified before a
|
|
restore.
|
|
|
|
| Method | Path | Produces |
|
|
| :----- | :--------------------------- | -------------------------- |
|
|
| `GET` | `/snapshot` | `200 application/x-gzip` |
|
|
|
|
The table below shows this endpoint's support for
|
|
[blocking queries](/api/index.html#blocking-queries),
|
|
[consistency modes](/api/index.html#consistency-modes), and
|
|
[required ACLs](/api/index.html#acls).
|
|
|
|
| Blocking Queries | Consistency Modes | ACL Required |
|
|
| ---------------- | ----------------- | ------------ |
|
|
| `NO` | `default,stale` | `management` |
|
|
|
|
### Parameters
|
|
|
|
- `dc` `(string: "")` - Specifies the datacenter to query. This will default
|
|
to the datacenter of the agent being queried. This is specified as part of the
|
|
URL as a query parameter.
|
|
|
|
- `stale` `(bool: false)` - Specifies that any follower may reply. By default
|
|
requests are forwarded to the leader. Followers may be faster to respond, but
|
|
may have stale data. To support bounding the acceptable staleness of
|
|
snapshots, responses provide the `X-Consul-LastContact` header containing the
|
|
time in milliseconds that a server was last contacted by the leader node. The
|
|
`X-Consul-KnownLeader` header also indicates if there is a known leader. These
|
|
can be used by clients to gauge the staleness of a snapshot and take
|
|
appropriate action. The stale mode is particularly useful for taking a
|
|
snapshot of a cluster in a failed state with no current leader.
|
|
|
|
### Sample Request
|
|
|
|
With a custom datacenter:
|
|
|
|
```text
|
|
$ curl https://consul.rocks/v1/snapshot?dc=my-datacenter -o snapshot.tgz
|
|
```
|
|
|
|
The above example results in a tarball named `snapshot.tgz` in the current working directory.
|
|
|
|
In addition to the Consul standard stale-related headers, the `X-Consul-Index`
|
|
header will contain the index at which the snapshot took place.
|
|
|
|
## Restore Snapshot
|
|
|
|
This endpoint restores a point-in-time snapshot of the Consul server state.
|
|
|
|
Restores involve a potentially dangerous low-level Raft operation that is not
|
|
designed to handle server failures during a restore. This operation is primarily
|
|
intended to be used when recovering from a disaster, restoring into a fresh
|
|
cluster of Consul servers.
|
|
|
|
The body of the request should be a snapshot archive returned from a previous
|
|
call to the `GET` method.
|
|
|
|
| Method | Path | Produces |
|
|
| :----- | :--------------------------- | ----------------------------- |
|
|
| `PUT` | `/snapshot` | `200 text/plain (empty body)` |
|
|
|
|
The table below shows this endpoint's support for
|
|
[blocking queries](/api/index.html#blocking-queries),
|
|
[consistency modes](/api/index.html#consistency-modes), and
|
|
[required ACLs](/api/index.html#acls).
|
|
|
|
| Blocking Queries | Consistency Modes | ACL Required |
|
|
| ---------------- | ----------------- | ------------ |
|
|
| `NO` | `none` | `management` |
|
|
### Parameters
|
|
|
|
- `dc` `(string: "")` - Specifies the datacenter to query. This will default
|
|
to the datacenter of the agent being queried. This is specified as part of the
|
|
URL as a query parameter.
|
|
|
|
### Sample Request
|
|
|
|
```text
|
|
$ curl \
|
|
--request PUT \
|
|
--data-binary @snapshot \
|
|
https://consul.rocks/v1/snapshot
|
|
```
|
|
|
|
~> Some tools default to www/encoded uploads. Consul expects the snapshot to be
|
|
in pure binary form.
|