MySQL configuration for Vault backend storage

The MySQL storage backend is used to persist Vault's data in a MySQL server or cluster.

High Availability – the MySQL storage backend supports high availability. Note that due to the way mysql locking functions work they are lost if a connection dies. If you would like to not have frequent changes in your elected leader you can increase interactive_timeout and wait_timeout MySQL config to much higher than default which is set at 8 hours.
Community Supported – the MySQL 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.

storage "mysql" {
  username = "user1234"
  password = "secret123!"
  database = "vault"
}

`mysql` parameters

address (string: "127.0.0.1:3306") – Specifies the address of the MySQL host.
database (string: "vault") – Specifies the name of the database. If the database does not exist, Vault will attempt to create it.
table (string: "vault") – Specifies the name of the table. If the table does not exist, Vault will attempt to create it.
tls_ca_file (string: "") – Specifies the path to the CA certificate to connect using TLS.
plaintext_credentials_transmission (string: "") - Provides authorization to send credentials over plaintext. Failure to provide a value AND a failure to provide a TLS CA certificate will warn that the credentials are being sent over plain text. In the future, failure to do acknowledge or use TLS will result in server start being prevented. This will be done to ensure credentials are not leaked accidentally.
max_parallel (string: "128") – Specifies the maximum number of concurrent requests to MySQL.
max_idle_connections (string: "0") – Specifies the maximum number of idle connections to the database. A zero uses value defaults to 2 idle connections and a negative value disables idle connections. If larger than max_parallel it will be reduced to be equal.
max_connection_lifetime (string: "0") – Specifies the maximum amount of time in seconds that a connection may be reused. If <= 0s connections are reused forever.

Additionally, Vault requires the following authentication information.

username (string: <required>) – Specifies the MySQL username to connect to the database.
password (string: <required>) – Specifies the MySQL password to connect to the database.

ha_enabled (string: "false") - Specifies if high availability mode is enabled. This is a boolean value, but it is specified as a string like "true" or "false".
lock_table (string: "vault_lock") – Specifies the name of the table to use for storing high availability information. By default, this is the name of the table suffixed with _lock. If the table does not exist, Vault will attempt to create it.

This example shows configuring the MySQL backend to use a custom database and table name.

storage "mysql" {
  database = "my-vault"
  table    = "vault-data"
  username = "user1234"
  password = "pass5678"
}