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: