kubectl edit deployment del-deploy replicas : 3 --> 파드의 개수를 수정
https://velog.io/@ragnarok_code/%EB%94%94%EC%8A%A4%ED%81%AC-%ED%8C%8C%ED%8B%B0%EC%85%98-%EB%B3%BC%EB%A5%A8%EC%9D%B4%EB%9E%80
https://hyeo-noo.tistory.com/379