命令使用:
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redis-cli [OPTIONS] [cmd [arg [arg ...]]] |
选项说明:
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-h <hostname> Server hostname (default: 127.0.0.1). ip地址-p <port> Server port (default: 6379). 服务器端口号-s <socket> Server socket (overrides hostname and port).-a <password> Password to use when connecting to the server. 密码-u <uri> Server URI. url格式的地址-r <repeat> Execute specified command N times.-i <interval> When -r is used, waits <interval> seconds per command. It is possible to specify sub-second times like -i 0.1.-n <db> Database number. 指定数据库-x Read last argument from STDIN.-d <delimiter> Multi-bulk delimiter in for raw formatting (default: \n).-c Enable cluster mode (follow -ASK and -MOVED redirections).--raw Use raw formatting for replies (default when STDOUT is not a tty).--no-raw Force formatted output even when STDOUT is not a tty.--csv Output in CSV format.--stat Print rolling stats about server: mem, clients, ... 统计数据 连续输出--latency Enter a special mode continuously sampling latency. If you use this mode in an interactive session it runs forever displaying real-time stats. Otherwise if --raw or --csv is specified, or if you redirect the output to a non TTY, it samples the latency for 1 second (you can use -i to change the interval), then produces a single output and exits. 延时统计--latency-history Like --latency but tracking latency changes over time. Default time interval is 15 sec. Change it using -i.--latency-dist Shows latency as a spectrum, requires xterm 256 colors. Default time interval is 1 sec. Change it using -i.--lru-test <keys> Simulate a cache workload with an 80-20 distribution.--replica Simulate a replica showing commands received from the master.--rdb <filename> Transfer an RDB dump from remote server to local file. 导出rdb文件--pipe Transfer raw Redis protocol from stdin to server.管道模式--pipe-timeout <n> In --pipe mode, abort with error if after sending all data. no reply is received within <n> seconds. Default timeout: 30. Use 0 to wait forever. 管道超时--bigkeys Sample Redis keys looking for big keys.--hotkeys Sample Redis keys looking for hot keys. only works when maxmemory-policy is *lfu.--scan List all keys using the SCAN command.获取服务器所有的键--pattern <pat> Useful with --scan to specify a SCAN pattern.正则表达式 用于scan命令中--intrinsic-latency <sec> Run a test to measure intrinsic system latency. The test will run for the specified amount of seconds.--eval <file> Send an EVAL command using the Lua script at <file>.--ldb Used with --eval enable the Redis Lua debugger.--ldb-sync-mode Like --ldb but uses the synchronous Lua debugger, in this mode the server is blocked and script changes are not rolled back from the server memory.--cluster <command> [args...] [opts...] Cluster Manager command and arguments (see below).--verbose Verbose mode.--no-auth-warning Don't show warning message when using password on command line interface. |
注意：
-u 选项中url格式参考文档https://www.iana.org/assignments/uri-schemes/prov/redis
格式为：redis://user:secret@localhost:6379/0?foo=bar&qux=baz
举例：
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root@hylaz:~# redis-cli127.0.0.1:6379> set name hylazOK127.0.0.1:6379> quitroot@hylaz:~# redis-cli -h 127.0.0.1127.0.0.1:6379> get name"hylaz"127.0.0.1:6379> select 6127.0.0.1:6379[6]> root@hylaz:~# redis-cli -h 127.0.0.1 -p 6379 -n 2127.0.0.1:6379[2]> get age |
server中统计选项
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root@hylaz:~# redis-cli --stat------- data ------ --------------------- load -------------------- - child -keys mem clients blocked requests connections 11 835.52K 1 0 12 (+0) 5 11 835.52K 1 0 13 (+1) 5 11 835.52K 1 0 14 (+1) 5 11 835.52K 1 0 15 (+1) 5 |
列表中选项说明：
| 选项 | 含义 |
|---|---|
| keys | server中key的数量 |
| mem | 键值对的总内存量 |
| clients | 当前连接的总clients数量 |
| blocked | 当前阻塞的客户端数量 |
| requests | 服务器请求总次数 (+1) 截止上次请求增加次数 |
| connections | 服务器连接次数 |
使用info命令获取服务器的信息
导入rdb文件 命令：redis-cli --rdb rdb.log
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root@hylaz:~# redis-cli --rdb rdb.logSYNC sent to master, writing 344 bytes to 'rdb.log'Transfer finished with success. |
该命令选项实现：
- 向server发送SYNC命令，返回需要写的总字节数
- 从server读取总字节数据写到指定文件中
找出各种数据类型的最大键值对
命令：redis-cli --big-keys
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root@hylaz:~# redis-cli --bigkeys # Scanning the entire keyspace to find biggest keys as well as# average sizes per key type. You can use -i 0.1 to sleep 0.1 sec# per 100 SCAN commands (not usually needed). [00.00%] Biggest string found so far 'name1' with 5 bytes[00.00%] Biggest set found so far 'myset' with 1 members[00.00%] Biggest string found so far 'key' with 6 bytes -------- summary ------- Sampled 13 keys in the keyspace!Total key length in bytes is 52 (avg len 4.00) Biggest string found 'key' has 6 bytesBiggest set found 'myset' has 1 members 12 strings with 33 bytes (92.31% of keys, avg size 2.75)0 lists with 0 items (00.00% of keys, avg size 0.00)1 sets with 1 members (07.69% of keys, avg size 1.00)0 hashs with 0 fields (00.00% of keys, avg size 0.00)0 zsets with 0 members (00.00% of keys, avg size 0.00)0 streams with 0 entries (00.00% of keys, avg size 0.00) |
该选项实现：通过使用scan命令遍历server中的键值对，针对不同数据类型进行统计，
找出server中热点key 命令：redis-cli --hotkeys
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# Scanning the entire keyspace to find hot keys as well as# average sizes per key type. You can use -i 0.1 to sleep 0.1 sec# per 100 SCAN commands (not usually needed). [00.00%] Hot key 'dd' found so far with counter 4[00.00%] Hot key 'myset' found so far with counter 5[00.00%] Hot key 'a' found so far with counter 5[00.00%] Hot key 'dds' found so far with counter 4[71.43%] Hot key 'aa' found so far with counter 4[71.43%] Hot key 'key' found so far with counter 4 -------- summary ------- Sampled 14 keys in the keyspace!hot key found with counter: 5 keyname: mysethot key found with counter: 5 keyname: ahot key found with counter: 4 keyname: ddhot key found with counter: 4 keyname: ddshot key found with counter: 4 keyname: aahot key found with counter: 4 keyname: key |
选项实现：
1. redis实现8种缓存淘汰策略：
voltile-lru：从已设置过期时间的数据集（server.db[i].expires）中挑选最近最少使用的数据淘汰
volatile-ttl：从已设置过期时间的数据集（server.db[i].expires）中挑选将要过期的数据淘汰
volatile-random：从已设置过期时间的数据集（server.db[i].expires）中任意选择数据淘汰
volatile-lfu: 从已设置过期时间的数据集驱逐使用频率最少的键
allkeys-lru:从数据集（server.db[i].dict）中挑选最近最少使用的数据淘汰
allkeys-lfu: 从所有键中驱逐使用频率最少的键
allkeys-random：从数据集（server.db[i].dict）中任意选择数据淘汰
no-enviction（驱逐）：禁止驱逐数据 当内存不足以容纳新写入数据时，新写入操作会报错
需要设置淘汰策略为lru或者lfu
2. 命令实现使用scan命令遍历所有的键值对，针对每个键值对使用OBJECT freq 获取该键值对的信息
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