This is a basic example on how to use the
local-exec provisioner in terraform, and I will use it to write a environment variable’s value to disk.
Get the latest version of terraform, for this post, I will be using the latest version of the time of writing:
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Ensure that it’s working:
The local-exec provisioner allows us to run a command locally, so to test that we will write the environment variable
owner=ruan to disk.
First setup our
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As you can see our
local-exec provisioner is issuing the command echo to write the environment variable
owner’s value to a file on disk, and the file name is
file_ + the null resource’s id.
As we are referencing a variable, we need to define the variable, I will define it in
As you can see, I am not defining the value, as I will define the value at runtime.
When we initialize terraform, terraform builds up a dependency tree from all the
.tf files and downloads any dependencies it requires:
Run our deployment and pass our variable at runtime:
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View the written file:
If we wanted to define the environment variable in the
variables.tf file, it will look like this:
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The github repository for this code is located at: