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redis-stat是一个用ruby写成的监控redis的程序，基于info命令获取信息，而不是通过monitor获取信息
一、安装ruby
二、替换rubygems
三、安装redis-stat
四、卸载daemons
五、安装SystemTimer
补充：redis-stat
redis-stat是实时监控Redis实例的状态，包括overview、vmstat、vmpage、ondisk-size、latency，具体信息如下：
$ ./redis-stat help
Usage: redis-stat <type> … options …
Statistic types:
overview (default) Print general information about a Redis instance.
vmstat Print information about Redis VM activity.
vmpage Try to guess the best vm-page-size for your dataset.
ondisk-size Stats and graphs about values len once stored on disk.
latency Measure Redis server latency.
Options:
host <hostname> Server hostname (default 127.0.0.1)
port <hostname> Server port (default 6379)
delay <milliseconds> Delay between requests (default: 1000 ms, 1 second).
samplesize <keys> Number of keys to sample for ‘vmpage’ stat.
logscale User power-of-two logarithmic scale in graphs.
一个简单的测试例子：
$ ./redis-stat host 127.0.0.1 port 6379
——- data —— ——————— load ——————– – child –
keys mem clients blocked requests connections
29602 3.45M 1 0 30090 (+0) 157
29602 3.45M 1 0 30091 (+1) 157
29602 3.45M 1 0 30092 (+1) 157
29602 3.45M 1 0 30093 (+1) 157
29602 3.45M 1 0 30094 (+1) 157
29602 3.45M 1 0 30095 (+1) 157
29602 3.45M 1 0 30096 (+1) 157
29602 3.45M 1 0 30097 (+1) 157
29602 3.45M 1 0 30098 (+1) 157
…
…
查看Redis实例的实时的latency也非常有用：
$ ./redis-stat latency host 127.0.0.1 port 6379
1: 0.23 ms
2: 0.67 ms
3: 0.21 ms
4: 0.23 ms
5: 0.23 ms
6: 0.16 ms
7: 0.37 ms
…
…
