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Language change cluster -> datacenter (#5212) 

* Updating the language from cluster to datacenter in the backup guide to be consistent and more accurate.

* missed some clusters
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website/source/docs/guides/backup.html.md
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@ -1,14 +1,14 @@
---
layout: "docs"
page_title: "Cluster Backups"
page_title: "Datacenter Backups"
sidebar_current: "docs-guides-backups"
description: |-
Consul provide the snapshot tool for backing up and restoring data. In this guide you will learn how to use both.
---
# Cluster Backups
# Datacenter Backups
Creating server backups is an important step in production deployments. Backups provide a mechanism for the server to recover from an outage (network loss, operator error, or a corrupted data directory). All servers write to the `-data-dir` before commit on write requests. The same directory is used on client agents to persist local state too, but this is not critical and can be rebuilt when recreating an agent. Local client state is not backed up in this guide and doesn't need to be in general, only the server's Raft store state.
Creating datacenter backups is an important step in production deployments. Backups provide a mechanism for the Consul server to recover from an outage (network loss, operator error, or a corrupted data directory). All servers write to the `-data-dir` before commit on write requests. The same directory is used on client agents to persist local state too, but this is not critical and can be rebuilt when recreating an agent. Local client state is not backed up in this guide and doesn't need to be in general, only the server's Raft store state.
Consul provides the [snapshot](https://consul.io/docs/commands/snapshot.html) command which can be run using the CLI or the API. The `snapshot` command saves a point-in-time snapshot of the state of the Consul servers which includes, but is not limited to:
@ -20,13 +20,13 @@ Consul provides the [snapshot](https://consul.io/docs/commands/snapshot.html) co
With [Consul Enterprise](/docs/commands/snapshot/agent.html), the `snapshot agent` command runs periodically and writes to local or remote storage (such as Amazon S3).
By default, all snapshots are taken using `consistent` mode where requests are forwarded to the leader which verifies that it is still in power before taking the snapshot. Snapshots will not be saved if the cluster is degraded or if no leader is available. To reduce the burden on the leader, it is possible to [run the snapshot](/docs/commands/snapshot/save.html) on any non-leader server using `stale` consistency mode.
By default, all snapshots are taken using `consistent` mode where requests are forwarded to the leader which verifies that it is still in power before taking the snapshot. Snapshots will not be saved if the datacenter is degraded or if no leader is available. To reduce the burden on the leader, it is possible to [run the snapshot](/docs/commands/snapshot/save.html) on any non-leader server using `stale` consistency mode.
This spreads the load across nodes at the possible expense of losing full consistency guarantees. Typically this means that a very small number of recent writes may not be included. The omitted writes are typically limited to data written in the last `100ms` or less from the recovery point. This is usually suitable for disaster recovery. However, the system can’t guarantee how stale this may be if executed against a partitioned server.
## Create Your First Backup
The `snapshot save` command for backing up the cluster state has many configuration options. In a production environment, you will want to configure ACL tokens and client certificates for security. The configuration options also allow you to specify the datacenter and server to collect the backup data from. Below are several examples.
The `snapshot save` command for backing up the datacenter state has many configuration options. In a production environment, you will want to configure ACL tokens and client certificates for security. The configuration options also allow you to specify the datacenter and server to collect the backup data from. Below are several examples.
First, we will run the basic snapshot command on one of our servers with the all the defaults, including `consistent` mode.
@ -49,7 +49,7 @@ Version 1
To understand each field review the inspect [documentation](https://www.consul.io/docs/commands/snapshot/inspect.html). Notably, the `Version` field does not correspond to the version of the data. Rather it is the snapshot format version.
Next, let’s collect the cluster data from a non-leader by specifying stale mode.
Next, let’s collect the datacenter data from a non-leader server by specifying stale mode.
```sh
$ consul snapshot save -stale backup.snap
@ -66,13 +66,13 @@ Saved and verified snapshot to index 2287
In the above example, we set the token as an ENV and the ca-file with a command line flag.
For production use, the `snapshot save` command or [API](https://www.consul.io/api/snapshot.html) should be scripted and run frequently. In addition to frequently backing up the cluster state, there are several use cases when you would also want to manually execute `snapshot save`. First, you should always backup the cluster before upgrading. If the upgrade does not go according to plan it is often not possible to downgrade due to changes in the state store format. Restoring from a backup is the only option so taking one before the upgrade will ensure you have the latest data. Second, if the cluster loses quorum it may be beneficial to save the state before the servers become divergent. Finally, you can manually snapshot a cluster and use that to bootstrap a new cluster with the same state.
For production use, the `snapshot save` command or [API](https://www.consul.io/api/snapshot.html) should be scripted and run frequently. In addition to frequently backing up the datacenter state, there are several use cases when you would also want to manually execute `snapshot save`. First, you should always backup the datacenter before upgrading. If the upgrade does not go according to plan it is often not possible to downgrade due to changes in the state store format. Restoring from a backup is the only option so taking one before the upgrade will ensure you have the latest data. Second, if the datacenter loses quorum it may be beneficial to save the state before the servers become divergent. Finally, you can manually snapshot a datacenter and use that to bootstrap a new datacenter with the same state.
Operationally, the backup process does not need to be executed on every server. Additionally, you can use the configuration options to save the backups to a mounted filesystem. The mounted filesystem can even be cloud storage, such as Amazon S3. The enterprise command `snapshot agent` automates this process.
## Restore from Backup
Running the `restore` process should be straightforward. However, there are a couple of actions you can take to ensure the process goes smoothly. First, make sure the cluster you are restoring is stable and has a leader. You can see this using `consul operator raft list-peers` and checking server logs and telemetry for signs of leader elections or network issues.
Running the `restore` process should be straightforward. However, there are a couple of actions you can take to ensure the process goes smoothly. First, make sure the datacenter you are restoring is stable and has a leader. You can see this using `consul operator raft list-peers` and checking server logs and telemetry for signs of leader elections or network issues.
You will only need to run the process once, on the leader. The Raft consensus protocol ensures that all servers restore the same state.

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@ -24,8 +24,6 @@ The following guides are available:
* [Bootstrapping](/docs/guides/bootstrapping.html) - This guide covers bootstrapping a new datacenter. This covers safely adding the initial Consul servers.
* [Cluster Backups](/docs/guides/backup.html) - Consul provide the snapshot tool for backing up and restoring data. In this guide you will learn how to use both.
* [Connect in Production](/docs/guides/connect-production.html) - This guide describes critical aspects of operating Consul Connect in Production.
* [Connect with Envoy](/docs/guides/connect-envoy.html) - This guide will describe how to setup a development-mode Consul server and two Envoy proxies on a single machine using Docker.
@ -40,6 +38,8 @@ The following guides are available:
* [Creating Certificates](/docs/guides/creating-certificates.html) - This guide describes how to setup CA and certificates to secure a Consul cluster with TLS.
* [Datacenter Backups](/docs/guides/backup.html) - Consul provide the snapshot tool for backing up and restoring data. In this guide you will learn how to use both.
* [Deployment Guide](/docs/guides/deployment-guide.html) - This deployment guide covers the steps required to install and configure a single HashiCorp Consul cluster as defined in the Consul Reference Architecture.
* [DNS Caching](/docs/guides/dns-cache.html) - Enabling TTLs for DNS query caching

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website/source/layouts/docs.erb
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@ -415,7 +415,7 @@
<a href="/docs/guides/bootstrapping.html">Bootstrapping</a>
</li>
<li<%= sidebar_current("docs-guides-backups") %>>
<a href="/docs/guides/backup.html">Cluster Backups</a>
<a href="/docs/guides/backup.html">Datacenter Backups</a>
</li>
<li<%= sidebar_current("docs-guides-connect-production") %>>
<a href="/docs/guides/connect-production.html">Connect in Production</a>