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
http://zosel.net/trackback/3
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