open-vault/website/source/docs/configuration/storage/zookeeper.html.md

layout	page_title	sidebar_current	description
docs	Zookeeper - Storage Backends - Configuration	docs-configuration-storage-zookeeper	The Zookeeper storage backend is used to persist Vault's data in Zookeeper.

Zookeeper Storage Backend

The Zookeeper storage backend is used to persist Vault's data in Zookeeper.

• High Availability – the Zookeeper storage backend supports high availability.

• Community Supported – the Zookeeper storage backend is supported by the community. While it has undergone review by HashiCorp employees, they may not be as knowledgeable about the technology. If you encounter problems with them, you may be referred to the original author.

backend "zookeeper" {
  address = "localhost:2181"
  path    = "vault/"
}

zookeeper Parameters

• address (string: "localhost:2181") – Specifies the addresses of the Zookeeper instances as a comma-separated list.

• path (string: "vault/") – Specifies the path in Zookeeper where data will be stored.

The following optional settings can be used to configure zNode ACLs:

~> Warning! If neither auth_info nor znode_owner are set, the backend will not authenticate with Zookeeper and will set the OPEN_ACL_UNSAFE ACL on all nodes. In this scenario, anyone connected to Zookeeper could change Vault’s znodes and, potentially, take Vault out of service.

• auth_info (string: "") – Specifies an authentication string in Zookeeper AddAuth format. For example, digest:UserName:Password could be used to authenticate as user UserName using password Password with the digest mechanism.

• znode_owner (string: "") – If specified, Vault will always set all permissions (CRWDA) to the ACL identified here via the Schema and User parts of the Zookeeper ACL format. The expected format is schema:user-ACL-match, for example:

  # Access for user "UserName" with corresponding digest "HIDfRvTv623G=="
  digest:UserName:HIDfRvTv623G==
  

  # Access from localhost only
  ip:127.0.0.1
  

  # Access from any host on the 70.95.0.0 network (Zookeeper 3.5+)
  ip:70.95.0.0/16
  

This backend also supports the following high availability parameters. These are discussed in more detail in the HA concepts page.

• cluster_addr (string: "") – Specifies the address to advertise to other Vault servers in the cluster for request forwarding. This can also be provided via the environment variable VAULT_CLUSTER_ADDR.

• disable_clustering (bool: false) – Specifies whether clustering features such as request forwarding are enabled. Setting this to true on one Vault node will disable these features only when that node is the active node.

• redirect_addr (string: <required>) – Specifies the address to advertise to other Vault servers in the cluster for client redirection. This can also be provided via the environment variable VAULT_REDIRECT_ADDR.

zookeeper Examples

Custom Address and Path

This example shows configuring Vault to communicate with a Zookeeper installation running on a custom port and to store data at a custom path.

backend "zookeeper" {
  address = "localhost:3253"
  path    = "my-vault-data/"
}

zNode Vault User Only

This example instructs Vault to set an ACL on all of its zNodes which permit access only to the user "vaultUser". As per Zookeeper's ACL model, the digest value in znode_owner must match the user in znode_owner.

backend "zookeeper" {
  znode_owner = "digest:vaultUser:raxgVAfnDRljZDAcJFxznkZsExs="
  auth_info   = "digest:vaultUser:abc"
}

zNode Localhost Only

This example instructs Vault to only allow access from localhost. As this is the ip no auth_info is required since Zookeeper uses the address of the client for the ACL check.

backend "zookeeper" {
  znode_owner = "ip:127.0.0.1"
}