1*de922be4SDavid Wangvip = "10.10.0.1" 2*de922be4SDavid Wangss = [ 3*de922be4SDavid Wang "172.18.1.3", 4*de922be4SDavid Wang "172.18.1.4", 5*de922be4SDavid Wang "172.18.1.5", 6*de922be4SDavid Wang] 7*de922be4SDavid Wang 8*de922be4SDavid Wang# iptables -t nat -A myservice -d 10.10.0.1 -m statistic --mode random --probability 0.3333 -j DNAT --to-destination 172.18.1.3 9*de922be4SDavid Wangx, n = 0, 10000 10*de922be4SDavid Wangdef build(s, e, p): 11*de922be4SDavid Wang n = e-s+1 12*de922be4SDavid Wang if n<=16: 13*de922be4SDavid Wang m = n 14*de922be4SDavid Wang for i in range(s, e): 15*de922be4SDavid Wang pp = 1.0/m 16*de922be4SDavid Wang print "iptables -t nat -A %s -d %s -m statistic --mode random --probability %.16f -j DNAT --to-destination %s" % (p, vip, pp, ss[i%len(ss)]) 17*de922be4SDavid Wang m-=1 18*de922be4SDavid Wang print "iptables -t nat -A %s -d %s -j DNAT --to-destination %s" % (p, vip, ss[i%len(ss)]) 19*de922be4SDavid Wang else: 20*de922be4SDavid Wang # split 21*de922be4SDavid Wang m = (s+e)/2 22*de922be4SDavid Wang x = "myservice%d_%d" % (s, m) 23*de922be4SDavid Wang print "iptables -t nat -N %s" % x 24*de922be4SDavid Wang pp = (m-s+1)*1.0/n 25*de922be4SDavid Wang print "iptables -t nat -A %s -m statistic --mode random --probability %.16f -j %s" % (p, pp, x) 26*de922be4SDavid Wang build(s, m, x) 27*de922be4SDavid Wang x = "myservice%d_%d" % (m+1, e) 28*de922be4SDavid Wang print "iptables -t nat -N %s" % x 29*de922be4SDavid Wang print "iptables -t nat -A %s -j %s" % (p, x) 30*de922be4SDavid Wang build(m+1, e, x) 31*de922be4SDavid Wang 32*de922be4SDavid Wangbuild(0, n-1, "myservice") 33