amazon-linux-extras enable vs install

Question

What is the difference between amazon-linux-extras enable and amazon-linux-extras install? I am asking because a recent change in our build.sh broke our AWS build - amazon-linux-extras enable ansible2 became amazon-linux-extras install ansible2.

After that the build started failing with:

Installation failed. Check that you have permissions to install.

I added a version check - ansible --version || exit 1 and it passes for amazon-linux-extras enable ansible2 which means that it too installs it (but somehow manages not to fail).

So what is the difference between the two?

Answer 1

To install a software package from the Extras Library, first confirm that the amazon-linux-extras repository is installed on your instance. Then, list the available software packages, enable the one you're looking for, and then install the package using yum.