ip_list=(1.1.1.1 2.2.2.2 3.3.3.3 4.4.4.4 5.5.5.5)

port=7001

len=${#ip_list[@]}

cluster_size=20

tag=0

for ((i=0;i<=$len-1;i++))

do

	let tag=tag+1

	if [[ $tag -le $cluster_size ]];then

		if [[ $i -eq $len-1 ]];then

			echo "${ip_list[$i]}:$port -> ${ip_list[0]}:$port"

			i=-1

			let port=port+1

		else

			echo "${ip_list[$i]}:$port -> ${ip_list[$i+1]}:$port"

			let port=port+1

		fi

	else

		break

	fi

done

1.1.1.1:7001 -> 2.2.2.2:7001

2.2.2.2:7002 -> 3.3.3.3:7002

3.3.3.3:7003 -> 4.4.4.4:7003

4.4.4.4:7004 -> 5.5.5.5:7004

5.5.5.5:7005 -> 1.1.1.1:7005

1.1.1.1:7006 -> 2.2.2.2:7006

2.2.2.2:7007 -> 3.3.3.3:7007

3.3.3.3:7008 -> 4.4.4.4:7008

4.4.4.4:7009 -> 5.5.5.5:7009

5.5.5.5:7010 -> 1.1.1.1:7010

1.1.1.1:7011 -> 2.2.2.2:7011

2.2.2.2:7012 -> 3.3.3.3:7012

3.3.3.3:7013 -> 4.4.4.4:7013

4.4.4.4:7014 -> 5.5.5.5:7014

5.5.5.5:7015 -> 1.1.1.1:7015

1.1.1.1:7016 -> 2.2.2.2:7016

2.2.2.2:7017 -> 3.3.3.3:7017

3.3.3.3:7018 -> 4.4.4.4:7018

4.4.4.4:7019 -> 5.5.5.5:7019

5.5.5.5:7020 -> 1.1.1.1:7020