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loopback device 설정은 한개 이상의 아이피를 자신의 아이피로 인식하기 위하여 사용한다.

lvs 설정을 할 때 중요한 꼭 필요한 역활이다.

virtual IP 또는 service IP를 자신도 자신의 서버에도 가지고 있어야 하기 때문이다.

단 같은 네트워크에 여러대가 같은 아이피를 가지고 있으면 아이피 충돌이 나지 않는가?

loopback device에 alias를 걸어 주어 자기 자신만 인식 할 수 있도록 해준다.

밑에 $VIP라고 되어 있는 변수에 자신이 설정 하려고 하는 아이피를 넣어 주면 된다.



1. ifconfig와 route 명령어를 이용한 설정법

ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP up
route add -host $VIP dev lo:0


2. iptables를 이용한 설정법

nat의 정보 확인
# iptables -L -t nat -n

설정
#iptables -t nat -D PREROUTING -j REDIRECT -d $VIP -p tcp
#iptables -t nat -D PREROUTING -j REDIRECT -d $VIP -p ucp
#iptables -t nat -A PREROUTING -j REDIRECT -d $VIP -p tcp
#iptables -t nat -A PREROUTING -j REDIRECT -d $VIP -p tcp

2012/07/24 22:30 2012/07/24 22:30
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ZOSEL:Too much is as bad as too little...!! 자공(子貢)이 공자에게 "사(師:子張의 이름)와 상(商:子夏의 이름)은 어느 쪽이 어집니까?" 하고 묻자, 공자는 "사는 지나치고 상은 미치지 못한다"고 대답하였다. "그럼 사가 낫단 말씀입니까?" 하고 반문하자, 공자는 "지나친 것은 미치지 못한 것과 같다(過猶不及)"고 말하였다.
Too much is as bad as too little...!! 자공(子貢)이 공자에게 "사(師:子張의 이름)와 상(商:子夏의 이름)은 어느 쪽이 어집니까?" 하고 묻자, 공자는 "사는 지나치고 상은 미치지 못한다"고 대답하였다. "그럼 사가 낫단 말씀입니까?" 하고 반문하자, 공자는 "지나친 것은 미치지 못한 것과 같다(過猶不及)"고 말하였다.
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