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Vault must be explicitly told where custom plugin binaries reside via its server configuration file ( config.hcl ). Add the plugin_directory directive:
Vault now supports running plugins as . This is a major shift, allowing operators to run plugins in containerized runtimes. The vault plugin runtime register command allows you to manage these container-based plugins, with the -type flag currently supporting a container runtime. vault plugin new
: When handling raw cryptographic material, leverage Go's memory mechanics or clear byte slices immediately after use to avoid exposing keys via core dumps.
Congratulations — you’ve successfully used vault plugin new to create, build, and run a custom plugin! Do you plan to deploy this on
Vault ships with dozens of built-in secrets engines (KV, AWS, GCP, Database, Transit, PKI) and auth methods (Token, LDAP, JWT, Kubernetes, GitHub). But consider these scenarios:
To upgrade a plugin, do not overwrite the running binary file directly. Instead, compile the new version with a distinct name (e.g., vault-plugin-secrets-custom-v2 ), place it in the plugin directory, register it with its new unique SHA-256 hash, and issue the vault plugin reload command to swap processes gracefully without downtime. This is a major shift, allowing operators to
The easiest way to write a new plugin is using Go (Golang) and the official go-plugin library.
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The vault/sdk package contains the core interfaces and types you will need to build a plugin. HashiCorp also provides excellent tutorial repositories that can serve as a starting point.
With your Vault cluster unsealed and your authenticated environment variables set ( VAULT_TOKEN and VAULT_ADDR ), write the newly compiled binary entry into Vault's system plugin catalog: