Aliases
An alias is a globally unique, DNS-like string that is associated with a destination resource. You can establish a session to a target by referencing its alias, instead of having to provide a target ID or target name and scope ID.
For example, if you have an alias boundary.dev, you can use it to connect to a target with the following command: boundary connect ssh boundary.dev.
Background
When you create a resource in Boundary, it assigns the resource a randomly generated identifier. You must use those IDs to perform actions in Boundary. When you connect to a target using the terminal, you must reference the target ID or target name and scope name.
As an example, to SSH to a target, you can execute the command boundary connect ssh -target-id ttcp_123456789.
Since it can be difficult to remember the unique IDs, users frequently have to look up the identifiers for any resources they want to operate on.
Aliases simplify this process. When you create an alias and associate it with a target, you can later use the alias value instead of the target ID in commands. Boundary automatically resolves to the target that the alias references.
Permissions
The existence of an alias for a Boundary resource does not change how permissions function. Anyone can attempt to use an alias to access a target, but if you do not have permission to access the target, the attempt fails. You can create an alias for a target, even if you do not have permission to access the target.
Separating the permissions from aliases and destination resources means a different set of people can manage the aliases than the people who have permission to operate on targets. For example, you may have a project with a sensitive set of targets. You can configure Boundary to allow a select few users to manage those targets, while a different group of users manage the aliases.
Naming conventions
An alias is a globally unique, DNS-like string that is associated with a destination resource. The alias value parameter does not have to be delimited by a suffix, and can be just a hostname.
Examples of valid aliases include database.boundary and webserver.boundary.
Single word aliases and transparent sessions
HashiCorp recommends that you do not use single-word aliases such as webserver as opposed to webserver.boundary, because single-word aliases do not work intuitively on Windows.
Windows DNS resolution does not support resolving unqualified single word DNS hostnames. You can make the hostname fully qualified, but is not intuitive to most users.
For example the following hostname works:
But this hostname does not work:
For this reason, if you expect any Windows users to use an alias, it should contain a dot (.) anywhere in the value.
Refer to the transparent sessions documentation for more information.
Scopes
You can only create aliases in the global scope. However, you can associate aliases with targets or hosts from any scope. Support for additional resource types may be added in the future.
If you delete a project, Boundary clears the destination_id parameter for any aliases that resolve to targets in that project, so that they no longer function.
Refer to the Configure aliases and transparent sessions pages to learn more.