生成指定规模大小的redis cluster对关系

需求：

指定一批ip列表，生成指定规模大小的redis cluster主从对应关系。

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

测试结果

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