Redis性能监控

1.监视Redis实例

./redis-cli --stat

------- data ------ --------------------- load -------------------- - child -
keys       mem      clients blocked requests            connections          
8          1.47M    3       0       29938813 (+0)       2816        
8          1.47M    3       0       29940663 (+1850)    2816        
8          1.47M    3       0       29942557 (+1894)    2816        
8          1.47M    3       0       29944024 (+1467)    2816        
8          1.47M    3       0       29945472 (+1448)    2816        
8          1.47M    3       0       29946878 (+1406)    2816        
8          1.47M    3       0       29948331 (+1453)    2816        
8          1.47M    3       0       29949734 (+1403)    2816        
8          1.47M    3       0       29951126 (+1392)    2816        
8          1.47M    3       0       29952611 (+1485)    2816        
8          1.47M    3       0       29954056 (+1445)    2816        
8          1.47M    3       0       29955494 (+1438)    2816        
8          1.47M    3       0       29956915 (+1421)    2816        
8          1.47M    3       0       29958298 (+1383)    2816        
8          1.47M    3       0       29959777 (+1479)    2816        
8          1.47M    3       0       29961192 (+1415)    2816        
8          1.47M    3       0       29962622 (+1430)    2816        
8          1.47M    3       0       29963983 (+1361)    2816        
8          1.47M    3       0       29965493 (+1510)    2816        
8          1.47M    3       0       29966872 (+1379)    2816        
------- data ------ --------------------- load -------------------- - child -
keys       mem      clients blocked requests            connections          
8          1.47M    3       0       29968343 (+1471)    2816        
8          1.47M    3       0       29969669 (+1326)    2816        
8          1.47M    3       0       29971173 (+1504)    2816        
8          1.47M    3       0       29972615 (+1442)    2816        
8          1.47M    3       0       29974036 (+1421)    2816        
8          1.47M    3       0       29975443 (+1407)    2816        
8          1.47M    3       0       29976899 (+1456)    2816        
8          1.47M    3       0       29978310 (+1411)    2816        
8          1.47M    3       0       29979754 (+1444)    2816        
8          1.47M    3       0       29981159 (+1405)    2816        
8          1.47M    3       0       29982590 (+1431)    2816        
8          1.47M    3       0       29984009 (+1419)    2816        
8          1.47M    3       0       29985462 (+1453)    2816        
8          1.47M    3       0       29986855 (+1393)    2816        
8          1.47M    3       0       29988289 (+1434)    2816        
8          1.47M    3       0       29989752 (+1463)    2816        
8          1.47M    3       0       29991165 (+1413)    2816        
8          1.47M    3       0       29992598 (+1433)    2816        
8          1.47M    3       0       29994028 (+1430)    2816        
8          1.47M    3       0       29995453 (+1425)    2816        

keys：当前节点缓存的key总数
mem：当前节点缓存总的占用内存
clients：当前节点的活跃连接数，或者说未断开连接的总连接数
blocked：当前节点正在等待阻塞命令的数量
requests：当前处理的请求数，与上一次请求数相减可知1秒所处理的请求，或者说所执行的命令数。
connections：是历史连接总数，即到目前为止，一共新建了多少个连接。与前一次相减，可以得出一秒内新建的连接数。

2.网络延迟

[root@iZnflZ bin]# ./redis-cli --latency
min: 0, max: 8, avg: 0.16 (7983 samples)
最小值0毫秒，最大值8毫秒，平均0,16毫秒，总共记录了7983个样例

   若是集群，查询本机到其他节点的网络延迟，添加  " -h ip "即可

3.慢查询

   首先看看redis.conf文件slowlog的配置，单位是微秒，默认配置10000微秒也就是10毫秒

# The following time is expressed in microseconds, so 1000000 is equivalent
# to one second. Note that a negative number disables the slow log, while
# a value of zero forces the logging of every command.
slowlog-log-slower-than 10000

   使用redis.cli  slowlog get 1打印最后一条，由于没有慢查询，展示的是empty list or set

[root@iZnflZ bin]# ./redis-cli 
127.0.0.1:6379> slowlog get 1
(empty list or set)
127.0.0.1:6379>