输出redis cluster 主从的对应关系，如果同一个主从关系的master和slave在同一个node节点上，在输出的对应关系末尾输出提示

需求：输出redis cluster 主从的对应关系，如果同一个主从关系的master和slave在同一个node节点上，在输出的对应关系末尾输出提示。

为什么会有这样的需求呢？在重新搭建redis cluster的时候，创建集群期间，发现：

redis-trib.rb create --replicas 1 \
5.5.5.101:29001 5.5.5.102:29002 5.5.5.103:29003 \
5.5.5.102:29001 5.5.5.103:29002 5.5.5.101:29003

 Adding replica 5.5.5.103:29002 to 5.5.5.103:29003 

同一个主从对应关系竟然在同一个节点上了！！！，为了让脚本适应一主多从的关系，这里又在103节点上启动了29005实例并做为29003的slave

 

cluster nodes信息：

8574f133fd52d32c133245274d027fb90893c524 5.5.5.101:@ myself,master -    connected -
a58667c0738ac2692f7733009d9b44fc6c264721 5.5.5.102:@ slave 8574f133fd52d32c133245274d027fb90893c524    connected
86316f44d2b56f7a4fbefd6c5f1594afb928769a 5.5.5.103:@ master -    connected -
a5d87acb12011b964334bd2bcacf9eb1924c5428 5.5.5.101:@ slave 98034fcf1d80c7401cafb22775bb70a0c367b91f    connected
b065bd036c1606f52a1a7c2a0936c259ee658799 5.5.5.103:@ slave 86316f44d2b56f7a4fbefd6c5f1594afb928769a    connected
d6866201dcb87d0383b26de03049cc2be73a0a70 5.5.5.103:@ slave 86316f44d2b56f7a4fbefd6c5f1594afb928769a    connected
98034fcf1d80c7401cafb22775bb70a0c367b91f 5.5.5.102:@ master -    connected -

脚本：

cmd="redis-cli -c -h $1 -p $2"
master_id=(`$cmd cluster nodes | grep master | awk '{print $1}'`)
master_ip_port=(`$cmd cluster nodes | grep master | awk '$2 ~ /@.*/{gsub("@.*","",$2);print $2}'`)

len=${#master_id[@]}
for ((i=;i<=$len-;i++));
do
        master_node=$(echo ${master_ip_port[$i]} | awk -F'[:]' '{print $1}')
        $cmd cluster slaves ${master_id[$i]} | awk '$2 ~ /@.*/{gsub("@.*","",$2);print $2}' > slave_ip_port
        for j in `cat slave_ip_port`
        do
            slave_node=$(echo $j | awk -F'[:]' '{print $1}')
            if [[ "$master_node" == "$slave_node" ]];then
                printf "%s%s%s\n" "${master_ip_port[$i]}->" `$cmd cluster slaves ${master_id[$i]} | awk '$2 ~ /@.*/{gsub("@.*","",$2);print $2}' | grep $j` "  master和slave在同一个节点上"
            else
                printf "%s%s\n" "${master_ip_port[$i]}->" `$cmd cluster slaves ${master_id[$i]} | awk '$2 ~ /@.*/{gsub("@.*","",$2);print $2}' | grep $j`
            fi
        done
done

测试：

[redis@lxd-vm1 ~]$ sh get_master_slave.sh 5.5.5.101
5.5.5.101:->5.5.5.102:
5.5.5.103:->5.5.5.103:  master和slave在同一个节点上
5.5.5.103:->5.5.5.103:  master和slave在同一个节点上
5.5.5.102:->5.5.5.101: