centos8平台用redis-cli对redis5监控和管理

一，监控redis-server上正在执行的命令

1,打开a终端:

[root@yjweb log]# /usr/local/soft/redis5/bin/redis-cli -h 127.0.0.1 -p 6379 monitor
OK

2,打开b终端:

[webop@yjweb ~]$ /usr/local/soft/redis5/bin/redis-cli
127.0.0.1:6379> get 123
(nil)
127.0.0.1:6379> set a 123
OK
127.0.0.1:6379> get a
"123"

3,回到a终端查看，可以看到:

[root@yjweb log]# /usr/local/soft/redis5/bin/redis-cli -h 127.0.0.1 -p 6379 monitor
OK
1583910234.328954 [0 127.0.0.1:32954] "COMMAND"
1583910244.535134 [0 127.0.0.1:32954] "get" "123"
1583910251.022645 [0 127.0.0.1:32954] "set" "a" "123"
1583910252.887344 [0 127.0.0.1:32954] "get" "a"

说明：刘宏缔的架构森林是一个专注架构的博客，地址：https://www.cnblogs.com/architectforest

         对应的源码可以访问这里获取： https://github.com/liuhongdi/

 说明：作者:刘宏缔 邮箱: 371125307@qq.com

二，统计redis-server的状态,间隔 1s 实时输出一次

[root@yjweb log]# /usr/local/soft/redis5/bin/redis-cli -h 127.0.0.1 -p 6379 --stat
------- data ------ --------------------- load -------------------- - child -
keys       mem      clients blocked requests            connections
1          908.36K  2       0       7 (+0)              4
1          908.36K  2       0       8 (+1)              4
1          908.36K  2       0       9 (+1)              4 

说明：

可以用-i参数指定刷新的时间间隔

 -i <interval>      When -r is used, waits <interval> seconds per command.
                     It is possible to specify sub-second times like -i 0.1.

这些参数可以通过help得到：

[root@yjweb ~]$ /usr/local/soft/redis5/bin/redis-cli --help

三，扫描大 KEY

[root@yjweb log]# /usr/local/soft/redis5/bin/redis-cli -h 127.0.0.1 -p 6379 --bigkeys

可以列出系统中的大key

说明；如果是list,会给出包含多少items

          如果是hash,会给出包含多少fields

四，统计当前机器到redis-server之间的延时

[root@yjweb log]# /usr/local/soft/redis5/bin/redis-cli -h 172.17.121.112 -p 6379 --latency

五，传出服务端的数据到当前目录，保存成一个rdb文件

[root@yjweb log]# /usr/local/soft/redis5/bin/redis-cli -h 172.17.121.112 -p 6379 --rdb order.rdb
SYNC sent to master, writing 14252566 bytes to 'order.rdb'
Transfer finished with success.

六，测试从redis-cli写一条信息到日志

      这里需要lua命令

127.0.0.1:6379> eval "redis.log(redis.LOG_NOTICE,'aaaa')" 0
(nil)

执行完成后我们查看日志:

[root@yjweb log]# tail -10 redis.log
8240:M 11 Mar 2020 14:55:45.681 # Server initialized
8240:M 11 Mar 2020 14:55:45.681 * DB loaded from disk: 0.000 seconds
8240:M 11 Mar 2020 14:55:45.681 * Ready to accept connections
8240:M 11 Mar 2020 15:10:46.025 * 1 changes in 900 seconds. Saving...
8240:M 11 Mar 2020 15:10:46.025 * Background saving started by pid 8322
8322:C 11 Mar 2020 15:10:46.026 * DB saved on disk
8322:C 11 Mar 2020 15:10:46.026 * RDB: 0 MB of memory used by copy-on-write
8240:M 11 Mar 2020 15:10:46.125 * Background saving terminated with success
8240:M 11 Mar 2020 15:53:47.814 * aaaa

看到了我们写入的aaaa字串

七，查看当前centos服务器版本

[root@yjweb ~]# cat /etc/redhat-release
CentOS Linux release 8.0.1905 (Core)