redis info 命令只能获取单个实例的信息。写了一个 shell ，可以方便的获取 redis 集群的汇总信息:
#!/bin/sh
ip=10.21.61.43
port=6379
sum_size=0
sum_mem=0
sum_conn=0
for addr in `redis-cli -p $port -h $ip cluster nodes | awk '{print $2}'`
do
host=`echo $addr | awk -F: '{print $1}'`
hport=`echo $addr | awk -F: '{print $2}'`
role=`redis-cli -p $hport -h $host info | grep "role:" | awk -F: '{print $2}' | tr -d '\r\n'`
if [ $role = "slave" ];then
continue
fi
dbsize=`redis-cli -p $hport -h $host dbsize`
mem=`redis-cli -p $hport -h $host info | grep "used_memory:" | awk -F: '{print $2}' | tr -d '\r\n' | tr -d 'G'`
conn=`redis-cli -p $hport -h $host info | grep "connected_clients:" | awk -F: '{print $2}' | tr -d '\r\n' | tr -d 'G'`
mem=$(awk "BEGIN{print $mem/1024.0/1024.0/1024.0}")
echo "$host $hport mem $mem G , dbsize $dbsize, connected_clients $conn"
sum_size=`expr $dbsize + $sum_size`
sum_mem=$(awk "BEGIN{print $sum_mem + $mem}")
sum_conn=$(awk "BEGIN{print $sum_conn + $conn}")
done
echo "集群dbsize 总数:$sum_size"
echo "集群内存（G） 总数:$sum_mem"
echo "连接数 总数:$sum_conn"
