TBH, it depends... If you are lucky, you may find a small company that just needs a hand in that area.
Alternatively, if you work in a large company (that has *nix), then try to move across.
If you've got yourself Certified, it shows you've got motivation and some level of knowledge.
Obviously certs aren't everything, but we've all got to start somewhere.
You may even want to stand up a public server so that you've got something to show prospective employers; ditto setting one up on a laptop you can take to interviews with you.