Redis Stat的安装指南

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

yum install -y ruby ruby-devel rubygems
apt-get install rubygems ruby..

由于国内网络原因，导致 rubygems.org 存放在 amazon s3 上面的资源文件间歇性连接失败。所以你会与遇到 gem install rack 或 bundle install 的时候半天没有响应，所以需要修改rubygems为淘宝镜像。

二、替换rubygems

gem sources --add https://ruby.taobao.org/ --remove http://rubygems.org/
gem sources -l

三、安装redis-stat

git clone https://github.com/junegunn/redis-stat.git
gem install redis-stat

会提示

building native extensions. this could take a while...
building native extensions. this could take a while...
building native extensions. this could take a while...
error: error installing redis-stat:
redis-stat requires daemons (~> 1.1.9, runtime)

四、卸载daemons

gem uninstall daemons
gem install daemons
gem install redis-stat

装redis-stat同时会安装daemons-1.1.9，如果系统已安装daemons其他版本，需再次卸载

error: error installing redis-stat:
redis-stat requires daemons (~> 1.1.9, runtime)

gem uninstall daemons

select gem to uninstall:
1. daemons-1.1.9
2. daemons-1.2.3
3. all versions
> 2
successfully uninstalled daemons-1.2.3

五、安装systemtimer

gem install systemtimer

然后就可以启动redis-stat了

redis-stat --verbose --server= ...: ...:
redis-stat 110.160.4.71:6379 110.47.90.168:6379 1 10

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
...
...