redis-cli 命令
戴国进 人气:0命令使用:
redis-cli [OPTIONS] [cmd [arg [arg ...]]]
选项说明:
-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:
root@hylaz:~# redis-cli 127.0.0.1:6379> set name hylaz OK 127.0.0.1:6379> quit root@hylaz:~# redis-cli -h 127.0.0.1 127.0.0.1:6379> get name "hylaz" 127.0.0.1:6379> select 6 127.0.0.1:6379[6]> root@hylaz:~# redis-cli -h 127.0.0.1 -p 6379 -n 2 127.0.0.1:6379[2]> get age
server中统计选项
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
root@hylaz:~# redis-cli --rdb rdb.log SYNC 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
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 bytes Biggest 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
# 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: myset hot key found with counter: 5 keyname: a hot key found with counter: 4 keyname: dd hot key found with counter: 4 keyname: dds hot key found with counter: 4 keyname: aa hot 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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