Set up performance replication

20min
|
Enterprise
Vault

Enterprise feature

This tutorial covers Performance Replication, a Vault Enterprise feature that requires a Vault Enterprise Premium license.

Scaling your Vault cluster to meet performance demands is critical to ensure workloads operate efficiently. Vault Enterprise and HCP Vault Dedicated support multi-region deployments so you can replicate data to regional Vault clusters to support local workloads.

Vault Enterprise offers two types of replication - disaster recovery and performance replication. If you are unfamiliar with Vault replication concepts, please review the Vault enterprise replication documentation.

Challenge

Your organization runs workloads in different regions. When operating a Vault cluster in a single region you observed increased latency from remote workloads causing delays and performance issues.

Solution

Vault Enterprise Performance Replication replicates data to Vault clusters in other regions allowing workloads in those regions to authenticate and consume Vault with reduced latency compared to accessing a Vault over long distances.

Vault performance replication starts with a primary cluster, and replicates to one or more secondary clusters. Unlike disaster recovery replication, secondary clusters maintain their own tokens and leases while sharing the Vault configuration from the primary cluster. Conceptual diagram showing two Vault clusters in separate regions

Prerequisites

This intermediate tutorial assumes that you have some knowledge of working with Vault and Docker.

You will need the following resources to complete the tutorial's hands-on scenario:

A Vault Enterprise license
Vault Enterprise binary installed on your PATH for CLI operations.
Docker installed.

Lab setup

Create a working directory to store files used in this tutorial.

$ export HC_LEARN_LAB=/tmp/learn-vault-lab && mkdir $HC_LEARN_LAB

Switch to the new directory. All steps in this tutorial should be run from this directory.
```
$ cd $HC_LEARN_LAB
```
Create directories for the Vault configuration an integrated storage data for each cluster.
```
$ mkdir -p cluster-pri/config cluster-pri/data cluster-sec/config cluster-sec/data
```
Create an environment variable with your Vault Enterprise license.
Example:
```
$ export VAULT_LICENSE=02MV.....snip...LMN0d
```
Create a Docker network to use for this tutorial. This network is created to replicate two Vault clusters with network connectivity between them.
```
$ docker network create learn-vault
a4cc891f903e8f20c4d5a40f2e9dfd77bb56793a06806e54fd4d228a8243d058
```

Start primary cluster

Create a configuration file for the primary cluster.

$ cat > cluster-pri/config/vault-server.hcl <<EOF
ui = true
listener "tcp" {
  tls_disable = 1
  address = "[::]:8200"
  cluster_address = "[::]:8201"
}

storage "raft" {
  path = "/vault/file"
}
EOF

Start the primary cluster.

$ docker run \
   --name=vault-enterprise-cluster-pri \
   --hostname=cluster-pri \
   --network=learn-vault \
   --publish 8200:8200 \
   --env VAULT_ADDR="http://localhost:8200" \
   --env VAULT_CLUSTER_ADDR="http://cluster-pri:8201" \
   --env VAULT_API_ADDR="http://cluster-pri:8200" \
   --env VAULT_RAFT_NODE_ID="cluster-pri" \
   --env VAULT_LICENSE="$VAULT_LICENSE" \
   --volume $PWD/cluster-pri/config/:/vault/config \
   --volume $PWD/cluster-pri/data/:/vault/file:z \
   --cap-add=IPC_LOCK \
   --detach \
   --rm \
   hashicorp/vault-enterprise vault server -config=/vault/config/vault-server.hcl

Example output:

Unable to find image 'hashicorp/vault-enterprise:latest' locally
latest: Pulling from hashicorp/vault-enterprise
73baa7ef167e: Pull complete
15c30ea739d2: Pull complete
7ac0bfe40225: Pull complete
ca40e0834a07: Pull complete
8496f662e13b: Pull complete
6bfd5d33bad3: Pull complete
33df159548ca: Pull complete
Digest: sha256:57a7ceffed6bb44ece54511a3d3507b099c3b0adc889fac3514beb0aaaed8601
Status: Downloaded newer image for hashicorp/vault-enterprise:latest
586e9996620170e13baef6bc0f8c614852cd84a837fd65bdd51df2aa506b6d6d

Verify the primary cluster container has started.

$ docker ps -f name=vault-enterprise --format "table {{.Names}}\t{{.Status}}"

NAMES                        STATUS
vault-enterprise-cluster-pri   Up 3 seconds

Initialize the primary cluster and write the unseal keys to a file.
Writing the unseal key to a file is used to simplify the tutorial steps. For production clusters, the unseal keys must be kept secure.
```
$ vault operator init \
    -address=http://127.0.0.1:8200 \
    -key-shares=1 \
    -key-threshold=1 \
    > $PWD/cluster-pri/.init
```
Export an environment variable with the primary clusters unseal key.
```
$ export CLUSTER_PRI_UNSEAL_KEY="$(grep 'Unseal Key 1' cluster-pri/.init | awk '{print $NF}')" && echo $CLUSTER_PRI_UNSEAL_KEY
037yeI1EmdcgtNy+h2+vPGCyEWOYecwrarW/lBqsiSA=
```
The unseal key is printed to ensure the value was properly set. If no key is returned, verify the key is present in the .init file.
Export an environment variable with the primary clusters root token.
```
$ export CLUSTER_PRI_ROOT_TOKEN="$(grep 'Initial Root Token' cluster-pri/.init | awk '{print $NF}')" && echo $CLUSTER_PRI_ROOT_TOKEN
hvs.aQrUNCbqnwq3t4tw5K6UcrWF
```
The root token is printed to ensure the value was properly set. If no token is returned, verify the key is present in the .init file.

Unseal the primary cluster.

$ vault operator unseal -address=http://127.0.0.1:8200 $CLUSTER_PRI_UNSEAL_KEY

Example output:

Key                     Value
---                     -----
Seal Type               shamir
Initialized             true
Sealed                  false
Total Shares            1
Threshold               1
Version                 1.17.1+ent
Build Date              2024-06-25T16:39:02Z
Storage Type            raft
Cluster Name            vault-cluster-4b364521
Cluster ID              0605f249-b686-6282-88cd-35d70f1b0113
HA Enabled              true
HA Cluster              n/a
HA Mode                 standby
Active Node Address     <none>
Raft Committed Index    54
Raft Applied Index      53

The Sealed status is now false, the cluster is unsealed and ready to be configured.

Export an environment variable with the address of the primary cluster.
```
$ export PRI_ADDR=http://127.0.0.1:8200
```

Start secondary cluster

Create a configuration file for the primary cluster.

$ cat > cluster-sec/config/vault-server.hcl <<EOF
ui = true
listener "tcp" {
  tls_disable = 1
  address = "[::]:8220"
  cluster_address = "[::]:8221"
}

storage "raft" {
  path = "/vault/file"
}
EOF

Start the secondary cluster.

$ docker run \
   --name=vault-enterprise-cluster-sec \
   --hostname=cluster-sec \
   --network=learn-vault \
   --publish 8220:8220 \
   --env VAULT_ADDR="http://localhost:8220" \
   --env VAULT_CLUSTER_ADDR="http://cluster-sec:8221" \
   --env VAULT_API_ADDR="http://cluster-sec:8220" \
   --env VAULT_RAFT_NODE_ID="cluster-sec" \
   --env VAULT_LICENSE="$VAULT_LICENSE" \
   --volume $PWD/cluster-sec/config/:/vault/config \
   --volume $PWD/cluster-sec/data/:/vault/file:z \
   --cap-add=IPC_LOCK \
   --detach \
   --rm \
   hashicorp/vault-enterprise vault server -config=/vault/config/vault-server.hcl

Example output:

586e9996620170e13baef6bc0f8c614852cd84a837fd65bdd51df2aa506b6d6d

Verify the secondary cluster container has started.

$ docker ps -f name=vault-enterprise --format "table {{.Names}}\t{{.Status}}"

NAMES                          STATUS
vault-enterprise-cluster-sec   Up 8 seconds
vault-enterprise-cluster-pri   Up 7 minutes

Initialize the secondary cluster and write the unseal keys to a file.

$ vault operator init \
    -address=http://127.0.0.1:8220 \
    -key-shares=1 \
    -key-threshold=1 \
    > $PWD/cluster-sec/.init

Export an environment variable with the secondary clusters unseal key.

$ export CLUSTER_SEC_UNSEAL_KEY="$(grep 'Unseal Key 1' cluster-sec/.init | awk '{print $NF}')" && echo $CLUSTER_SEC_UNSEAL_KEY
037yeI1EmdcgtNy+h2+vPGCyEWOYecwrarW/lBqsiSA=

Export an environment variable with the secondary clusters root token.

$ export CLUSTER_SEC_ROOT_TOKEN="$(grep 'Initial Root Token' cluster-sec/.init | awk '{print $NF}')" && echo $CLUSTER_SEC_ROOT_TOKEN
hvs.aQrUNCbqnwq3t4tw5K6UcrWF

Unseal the secondary cluster.

$ vault operator unseal -address=http://127.0.0.1:8220 $CLUSTER_SEC_UNSEAL_KEY

Example output:

Key                     Value
---                     -----
Seal Type               shamir
Initialized             true
Sealed                  false
Total Shares            1
Threshold               1
Version                 1.17.1+ent
Build Date              2024-06-25T16:39:02Z
Storage Type            raft
Cluster Name            vault-cluster-4b364521
Cluster ID              0605f249-b686-6282-88cd-35d70f1b0113
HA Enabled              true
HA Cluster              n/a
HA Mode                 standby
Active Node Address     <none>
Raft Committed Index    54
Raft Applied Index      53

The Sealed status is now false, the cluster is unsealed and ready to be configured.

Export an environment variable with the address of the secondary cluster.
```
$ export SEC_ADDR=http://127.0.0.1:8220
```

Configure the primary cluster

Before enabling performance replication, create a superpolicy policy and enable userpass auth method with superuser user on the primary cluster.

Log into the primary cluster.

$ echo $CLUSTER_PRI_ROOT_TOKEN | xargs vault login -address=$PRI_ADDR

Key                  Value
---                  -----
token                hvs.aQrUNCbqnwq3t4tw5K6UcrWF
token_accessor       VzzI18zBxpMBWUo1e3yruLFe
token_duration       ∞
token_renewable      false
token_policies       ["root"]
identity_policies    []
policies             ["root"]

Create create a superpolicy policy.

$ vault policy write -address=$PRI_ADDR superpolicy -<<EOF
path "*" {
  capabilities = ["create", "read", "update", "delete", "list", "sudo"]
}
EOF

Example output:

Success! Uploaded policy: superpolicy

Enable the userpass auth method.

$ vault auth enable -address=$PRI_ADDR userpass

Success! Enabled userpass auth method at: userpass/

Create a new user named superuser in userpass and attach the superpolicy policy.

$ vault write -address=$PRI_ADDR auth/userpass/users/superuser password="vaultMagic" policies="superpolicy"

Success! Data written to: auth/userpass/users/superuser

Enable the k/v secrets engine named replicatedkv.
```
$ vault secrets enable -address=$PRI_ADDR -path=replicatedkv kv-v2
Success! Enabled the kv-v2 secrets engine at: replicatedkv/
```
When you configure performance replication, Vault will replicate this mount to the secondary cluster.
Enable the k/v secrets engine named localkv, and mark the secret engine as local.
```
$ vault secrets enable -address=$PRI_ADDR -path=localkv -local kv-v2
Success! Enabled the kv-v2 secrets engine at: localkv/
```
When you configure performance replication, this mount is not replicated to the secondary cluster because you marked as local only using the -local flag.

Enable performance replication on the primary cluster.

$ vault write -address=$PRI_ADDR -f sys/replication/performance/primary/enable

WARNING! The following warnings were returned from Vault:

  * This cluster is being enabled as a primary for replication. Vault will be
  unavailable for a brief period and will resume service shortly.

Create a secondary bootstrap token on the primary cluster and store the token as a variable. The token value will be returned as part of the tutorial to ensure the command completed successfully.
```
$ SEC_BOOTSTRAP=$(vault write -address=$PRI_ADDR sys/replication/performance/primary/secondary-token id=secondary -format=json | jq -r '.wrap_info | .token') && echo Token: $SEC_BOOTSTRAP
Token: eyJhbGciOiJFUzUxMiIsInR5cCI6IkpXVCJ9...snip...-bz8obglE1OI2GDZk6rOWoSj9Rxvx2TZ4n8YV
```
The value for id is opaque to Vault and can be any identifying value you want. You can use the id to revoke the secondary. You can see the `id when you read the replication status on the primary. You will get back a wrapped response, except that the token will be a JWT instead of UUID-formatted random bytes.

Open a web browser and navigate to http://127.0.0.1:8200.
Log in with the root token printed to the terminal in the lab setup section.
You can retrieve this value again by running grep 'Initial Root Token' cluster-pri/.init from the terminal.
Click Policies in the left navigation menu.
Click Create ACL policy.
In the Name text box enter superpolicy.

In the Policy text box enter the policy.

path "*" {
  capabilities = ["create", "read", "update", "delete", "list", "sudo"]
}

Click Create policy.
Click Back to main navigation.
Click Access in the left navigation menu.
Click Enable new method.
Select Username & Password.
Click Enable method.
Click View method.
Click Create user.
Enter superuser in the Username text box and vaultMagic in the Password text box.
Expand Tokens.
Under Generated Tokens's Policies enter superpolicy in the text box and click Add.
Click Save.
Click Back to main navigation.
Click Secrets Engines in the left navigation menu.
Click Enable new engine.
Select KV.
In the Path text box enter replicatedkv.
Click Enable engine.
Click Secrets Engines in the left navigation menu.
Click Enable new engine.
Select KV.
In the Path text box enter localkv.
Expand Method Options.
Click the Local checkbox.
Click Enable Engine.
Click Replication in the left navigation menu.
Select Performance.
Click Enable Replication.
Click Add secondary.
Enter secondary in the Secondary ID text box.
Click Generate token.
Click Copy token and save it for later.
Click Close.

Configure the secondary cluster

Log into the secondary cluster.

$ echo $CLUSTER_SEC_ROOT_TOKEN | xargs vault login -address=$SEC_ADDR

Key                  Value
---                  -----
token                hvs.s4Yb7J80ZtglKo9WlYNR57mu
token_accessor       HIaozOx30nSKO6hSlspa8CIR
token_duration       ∞
token_renewable      false
token_policies       ["root"]
identity_policies    []
policies             ["root"]

Activate a secondary using the token generated on the primary cluster.
Warning
This command will destroy all existing data stored on the secondary cluster.
```
$ vault write -address=$SEC_ADDR sys/replication/performance/secondary/enable token=$SEC_BOOTSTRAP

WARNING! The following warnings were returned from Vault:

  * Vault has successfully found secondary information; it may take a while to
  perform setup tasks. Vault will be unavailable until these tasks and initial
  sync complete.
```
The secondary will use the address embedded in the bootstrap token, which is the primary's redirect address to make a connection to the primary. If the primary has no redirect address (for instance, if it's not in an HA cluster), you'll need to set the primary_api_addr parameter to specify the primary's API address at secondary enable time.
Once the secondary is activated and has bootstrapped, it will be ready for service and will maintain state with the primary. It is safe to seal/shutdown the primary and/or secondary; when both are available again, they will synchronize back into a replicated state.

Authenticate to the secondary cluster using the userpass auth method you previously enabled on the primary cluster. Enter vaultMagic when prompted for the password.

$ vault login -address=$SEC_ADDR -method=userpass username=superuser

Password (will be hidden):
Success! You are now authenticated. The token information displayed below
is already stored in the token helper. You do NOT need to run "vault login"
again. Future Vault requests will automatically use this token.

Key                    Value
---                    -----
token                  hvs.CAESIKZsAc7fnuz_VP8wBHj7U2TdtDZpqRfSUGe-SZTcFGC-GiEKHGh2cy5YWEJSZXIzaEg3a3F5RDJMdWtQTzhMbDAQvQI
token_accessor         xTlRFFdIdtI2XwPVLEOtTv55
token_duration         768h
token_renewable        true
token_policies         ["default" "superpolicy"]
identity_policies      []
policies               ["default" "superpolicy"]
token_meta_username    superuser

On a production system, after a secondary is activated, enabled auth methods should be used to get tokens with appropriate policies, as policies and auth method configuration are replicated.

Verify the replication status.

$ vault read -format=json -address=$SEC_ADDR sys/replication/status | jq

{
  "request_id": "b62afabd-550f-5396-0ea3-e6c68c7799a8",
  "lease_id": "",
  "lease_duration": 0,
  "renewable": false,
  "data": {
    "dr": {
      "mode": "disabled"
    },
    "performance": {
      "cluster_id": "8530b742-22da-00c7-52da-3c6cd6cc868c",
      "connection_state": "ready",
      "corrupted_merkle_tree": false,
      "known_primary_cluster_addrs": [
        "https://cluster-pri:8201"
      ],
      "last_corruption_check_epoch": "-62135596800",
      "last_reindex_epoch": "1719956509",
      "last_remote_wal": 7960,
      "last_start": "2024-07-02T21:41:49Z",
      "merkle_root": "82d3abb152158f116de193cdbaac2c2dc3624be5",
      "mode": "secondary",
      "primaries": [
        {
          "api_address": "http://cluster-pri:8200",
  ...snip...

The replication status shows this is a secondary cluster and the address of the primaries.

List the enabled secrets engines.

$ vault secrets list -address=$SEC_ADDR
Path             Type         Accessor              Description
----             ----         --------              -----------
cubbyhole/       cubbyhole    cubbyhole_da096a10    per-token private secret storage
identity/        identity     identity_962587a4     identity store
replicatedkv/    kv           kv_ec655082           n/a
sys/             system       system_e413f153       system endpoints used for control, policy and debugging

The replicatedkv secret engine, which you enabled on the primary cluster is replicated to the secondary cluster.

The localkv secret engine is not available on the secondary because you marked it as a local only mount using the -local flag.

Open a new web browser/browser tab and navigate to http://127.0.0.1:8220.
Log in with the root token printed to the terminal in the lab setup section.
You can retrieve this value again by running grep 'Initial Root Token' cluster-sec/.init from the terminal.
Click Replication in the left navigation menu.
Select Performance.
In the Cluster mode pull down menu, select Secondary.
Enter the activation token retrieved from the configure the primary cluster section.
The secondary will use the address embedded in the bootstrap token, which is the primary's redirect address to make a connection to the primary. If the primary has no redirect address (for instance, if it's not in an HA cluster), you'll need to set the primary_api_addr parameter to specify the primary's API address at secondary enable time.
Click Enable Replication.
Warning
This step will destroy all existing data stored on the secondary cluster.
Once the secondary is activated and has bootstrapped, it will be ready for service and will maintain state with the primary. It is safe to seal/shutdown the primary and/or secondary; when both are available again, they will synchronize back into a replicated state.
Click the user menu and select Log out.
Change the login Method from Token to Username.
Enter superuser in the Username text box, vaultMagic in the Password text box, and click Sign in.
On a production system, after a secondary is activated, enabled auth methods should be used to get tokens with appropriate policies, as policies and auth method configuration are replicated.
Click Replication in the left navigation menu.
Click Details.
Observe the connection_state and Primary cluster cards.
Click Back to main navigation.
Click Secrets Engines.
The replicatedkv secret engine, which you enabled on the primary cluster is replicated to the secondary cluster.
The localkv secret engine is not available on the secondary because you marked it as a local only mount using the local checkbox.

Manage replicated mounts

There are many regional data sovereignty requirements that must be taken into consideration when using replication. Consider a scenario where secrets stored on the primary cluster need to remain in the region where the cluster operates.

Path filters allow you to control which mounts are replicated across clusters and physical regions. With a path filter you can select which mounts will be replicated as part of a performance replication relationship.

By default, all non-local mounts and associated data are moved as part of replication. The paths filter feature enables users restrict which mounts are replicated, thereby allowing users to further control the movement of secrets across their infrastructure.

Path filters are also applied to mounts that have already been replicated. In this tutorial the replicatedkv secret engine was replicated from the primary cluster to the secondary.

You have just been given a new requirement that states the replicatedkv secret engine must now stay only on the primary cluster. You can add a path filter which will remove the replicated mount from the secondary.

Log back in to the primary cluster.

$ echo $CLUSTER_PRI_ROOT_TOKEN | xargs vault login -address=$PRI_ADDR

Key                  Value
---                  -----
token                hvs.aQrUNCbqnwq3t4tw5K6UcrWF
token_accessor       VzzI18zBxpMBWUo1e3yruLFe
token_duration       ∞
token_renewable      false
token_policies       ["root"]
identity_policies    []
policies             ["root"]

Add a path filter to deny the replicatedkv secret engine from being replicated.

$ vault write -address=$PRI_ADDR \
   sys/replication/performance/primary/paths-filter/secondary  \
   mode="deny" paths="replicatedkv"

Example output:

Success! Data written to: sys/replication/performance/primary/paths-filter/secondary

The ID secondary at the end of the path must match the ID used when configuring performance replication on the primary cluster.

Log back in to the secondary cluster. Enter vaultMagic when prompted for the password.

$ vault login -address=$SEC_ADDR -method=userpass username=superuser

Password (will be hidden):
Success! You are now authenticated. The token information displayed below
is already stored in the token helper. You do NOT need to run "vault login"
again. Future Vault requests will automatically use this token.

Key                    Value
---                    -----
token                  hvs.CAESIKZsAc7fnuz_VP8wBHj7U2TdtDZpqRfSUGe-SZTcFGC-GiEKHGh2cy5YWEJSZXIzaEg3a3F5RDJMdWtQTzhMbDAQvQI
token_accessor         xTlRFFdIdtI2XwPVLEOtTv55
token_duration         768h
token_renewable        true
token_policies         ["default" "superpolicy"]
identity_policies      []
policies               ["default" "superpolicy"]
token_meta_username    superuser

List the secret engines.

$ vault secrets list -address=$SEC_ADDR

Path          Type         Accessor              Description
----          ----         --------              -----------
cubbyhole/    cubbyhole    cubbyhole_da096a10    per-token private secret storage
identity/     identity     identity_962587a4     identity store
sys/          system       system_e413f153       system endpoints used for control, policy and debugging

The replicatedkv secret engine is no longer available on the secondary cluster.

Switch back to the browser/tab for the primary cluster.
Click Back to main navigation.
Click Replication in the left navigation menu and then click Performance.
Click the Secondaries tab.
Click the ellipsis button and select Path filter config.
Click Edit config.
If it is not already selected, select Deny.
In the Paths in this deny search box enter and select replicatedkv.
Click Update.
Switch back to the browser/tab for the secondary cluster.
Refresh the browswer/tab listing the enabled secrets engines.
The replicatedkv mount is no longer available on the secondary cluster.

Considerations for performance replication

Vault's performance replication model is intended to allow horizontally scaling Vault's functions rather than to act in a strict Disaster Recovery (DR) capacity.

As a result, Vault performance replication acts on static items within Vault, meaning information that is not part of Vault's lease-tracking system. In a practical sense, this means that all Vault information is replicated from the primary to secondaries except for tokens and secret leases.

Because token information must be checked and possibly rewritten with each use (e.g. to decrement its use count), replicated tokens would require every call to be forwarded to the primary, decreasing rather than increasing total Vault throughput.

Secret leases are tracked independently for two reasons: one, because every such lease is tied to a token and tokens are local to each cluster; and two, because tracking large numbers of leases is memory-intensive and tracking all leases in a replicated fashion could dramatically increase the memory requirements across all Vault nodes.

We believe that this performance replication model provides significant utility for horizontally scaling Vault's functionality. However, it does mean that certain principles must be kept in mind.

Always use the local cluster

First and foremost, when designing systems to take advantage of replicated Vault, you must ensure that they always use the same Vault cluster for all operations, as only that cluster will know about the client's Vault token.

Enabling a secondary wipes storage

Replication relies on having a shared keyring between primary and secondaries and also relies on having a shared understanding of the data store state. As a result, when replication is enabled, all of the secondary's existing storage will be wiped. This is irrevocable. Make a backup first if there is a remote chance you'll need some of this data at some future point.

Generally, activating as a secondary will be the first thing that is done upon setting up a new cluster for replication.

Replicated vs. local backend mounts

All backend mounts (of all types) that can be enabled within Vault default to being mounted as a replicated mount. This means that mounts cannot be enabled on a secondary, and mounts enabled on the primary will replicate to secondaries.

Mounts can also be marked local (via the -local flag on the Vault CLI or setting the local parameter to true in the API). This can only be performed at mount time; if a mount is local but should have been replicated, or vice versa, you must disable the backend and mount a new instance at that path with the local flag enabled. If you cannot start a new instance of a mount, you can use a path filter to deny replication to one or more secondaries.

Local mounts do not propagate data from the primary to secondaries, and local mounts on secondaries do not have their data removed during the syncing process. The exception is during initial bootstrapping of a secondary from a state where replication is disabled; all data, including local mounts, is deleted at this time (as the encryption keys will have changed so data in local mounts would be unable to be read).

Audit devices

In normal Vault usage, if Vault has at least one audit device configured and is unable to successfully log to at least one device, it will block further requests.

Replicated audit mounts must be able to successfully log on all replicated clusters. For example, if using the file audit device, the configured path must be able to be written to by all secondaries. It may be useful to use at least one local audit mount on each cluster to prevent such a scenario.

Never have two primaries

The replication model is not designed for active-active usage and enabling two primaries should never be done, as it can lead to data loss if they or their secondaries are ever reconnected.

Disaster recovery

Local backend mounts are not replicated and their use will require existing DR mechanisms if DR is necessary in your implementation.

If you need true DR, review the Disaster recovery replication tutorial.

Clean up

Stop the Vault Enterprise containers.

$ docker stop vault-enterprise-cluster-sec vault-enterprise-cluster-pri
vault-enterprise-cluster-sec
vault-enterprise-cluster-pri

Delete the Docker network created for this tutorial.
```
$ docker network rm learn-vault
learn-vault
```
Delete the temporary directory created for this tutorial.
```
$ cd ~ && rm -rf $HC_LEARN_LAB
```

Unset environment variables created for this tutorial (or close the terminal).

$ unset VAULT_LICENSE CLUSTER_PRI_UNSEAL_KEY CLUSTER_SEC_UNSEAL_KEY PRI_ADDR SEC_ADDR CLUSTER_SEC_ROOT_TOKEN CLUSTER_PRI_ROOT_TOKEN

Help and reference

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