https://nginxstore.com/blog/kubernetes/openshift%ec%97%90%ec%84%9c-%ec%97%94%ed%84%b0%ed%94%84%eb%9d%bc%ec%9d%b4%ec%a6%88%ea%b8%89-ingress-controller%ea%b0%80-%ed%95%84%ec%9a%94%ed%95%9c-%ec%9d%b4%ec%9c%a0/