(add-to-list 'auto-mode-alist '("\\.yml$" . yaml-mode))
(add-to-list 'auto-mode-alist '("\\.yaml$" . yaml-mode))
(add-to-list 'auto-mode-alist '("\\.yml\\.example$" . yaml-mode))

(defun customizations-for-yaml-mode ()
  (interactive)
  (flyspell-prog-mode)
  (linum-mode t)
  (fci-mode)
  (auto-complete-mode)
 (setq highlight-indentation-offset 2)
  (highlight-indentation-mode)
  (highlight-indentation-current-column-mode)
  (define-key yaml-mode-map (kbd "RET") 'newline-and-indent))

(add-hook 'yaml-mode-hook 'customizations-for-yaml-mode)