https://www.haedongg.net/2021/11/25/kubernetes-1-%ec%82%ac%ec%a0%84%ec%9e%91%ec%97%85-%eb%b0%8f-%eb%b0%94%ec%9d%b4%eb%84%88%eb%a6%ac-%ec%84%a4%ec%b9%98-offline-%ed%8f%90%ec%87%84%eb%a7%9d/