title: What environment variables are created in kubernetes by default
body: <p>I can't find this in the k8s documentation, I'm just wondering what are the default environment variables that are created in every container by k8s. Not user created defaults, but like (and this is just an example) maybe something like <code>{service_name}_PORT</code> or something like that. I just wanna know what information is available in a container by default.</p>