Terraform: Difference between revisions

You will also need credentials for access to your OpenStack project available to Terraform. There are three ways to provide your credentials to Terraform, described in the [[#Defining_OpenStack_provider|next section]]. Horizon, the OpenStack web interface, offers a simple way to download credentials: once logged in, click on ''API Access'' in the navigation bar, and on that page is a drop-down menu entitled “Download OpenStack RC File”. From here you may download a <code>clouds.yaml</code> file or an RC file which can be sourced from your shell session.

 

The RC file is a series of shell commands sourced from your existing session. Because it exports variables which must be available in your ''current'' shell session, this file is not run directly, as a script (in which case all exported variables would disappear when the script exited and its shell context destroyed). So, once downloaded, the RC file can then be sourced like so:

It will then prompt your for your OpenStack password, which along with necessary information about you, your tenant and the cloud you’re connecting to will be stored in a bunch of environment variables prefixed by <code>OS_</code>, such as <code>$OS_AUTH_URL</code> and so on. Have a look at the RC file to see what it’s doing. In Bash, you can type <code>echo $OS_&lt;tab&gt;</code> and auto-completion will list variables with that prefix.

My preferred method is to create a configuration in <code>$HOME/.config/openstack/clouds.yaml</code>. If you don’t have such a file already, you can download one as described above and move it into place. I also recommend changing the name given to the cloud in the downloaded file to something meaningful, especially if you use more than one OpenStack cloud. Then, to use the CLI tools described below, you simply create an environment variable <code>$OS_CLOUD</code> with the name of the cloud you want to use.

Later on I’ll explain how to use those with Terraform.