下载最新的
官网:http://redis.io/ 或者 http://code.google.com/p/redis/downloads/list
第一步:下载安装编译
#wget http://redis.googlecode.com/files/redis-2.6.14.tar.gz
#tar zxvf redis-2.6.14.tar.gz
#cd redis-2.6.14
#make
#make install
#cp redis.conf /etc/
第二步:修改配置
#vi /etc/redis.conf
配置见附录
第三步:启动进程
#redis-server /etc/redis.conf
查看进程有没有成功启动
#ps -ef | grep redis
测试输入一个键值
#redis-cli set test "123456"
获取键值
#redis-cli get test
关闭redis
# redis-cli shutdown //关闭所有
关闭某个端口上的redis
# redis-cli -p 6397 shutdown //关闭6397端口的redis
说明:关闭以后缓存数据会自动dump到硬盘上,硬盘地址见redis.conf中的dbfilename dump.rdb
PHP扩展
http://code.google.com/p/php-redis/
附录:无错配置
只要做如下配置即可:
daemonize yes
pidfile /var/run/redis.pid
port 6379
#bind 127.0.0.1
timeout 600
loglevel notice
logfile /elain/logs/redis/redis.log
databases 16
save 900 1
save 300 10
save 60 10000
rdbcompression yes
dbfilename dump.rdb
dir /elain/data/redis/
# maxclients 128
appendonly yes
appendfilename appendonly.aof
# appendfsync always
appendfsync everysec
# appendfsync no
requirepass elain
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
slowlog-log-slower-than 10000
slowlog-max-len 1024
really-use-vm yes
vm-enabled no
vm-swap-file /tmp/redis.swap
vm-max-memory 0
vm-page-size 32
vm-pages 134217728
vm-max-threads 4
hash-max-zipmap-entries 512
hash-max-zipmap-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
activerehashing yes
# include /path/to/local.conf
# include /path/to/other.conf
下面是本人配置的全文件
view plain
1. # Redis configuration file example
2.
3. # Note on units: when memory size is needed, it is possible to specifiy
4. # it in the usual form of 1k 5GB 4M and so forth:
5. #
6. # 1k => 1000 bytes
7. # 1kb => 1024 bytes
8. # 1m => 1000000 bytes
9. # 1mb => 1024*1024 bytes
10. # 1g => 1000000000 bytes
11. # 1gb => 1024*1024*1024 bytes
12. #
13. # units are case insensitive so 1GB 1Gb 1gB are all the same.
14.
15. # By default Redis does not run as a daemon. Use 'yes' if you need it.
16. # Note that Redis will write a pid file in /var/run/redis.pid when daemonized.
17. daemonize yes
18.
19. # When running daemonized, Redis writes a pid file in /var/run/redis.pid by
20. # default. You can specify a custom pid file location here.
21. pidfile /var/run/redis.pid
22.
23. # Accept connections on the specified port, default is 6379.
24. # If port 0 is specified Redis will not listen on a TCP socket.
25. port 6379
26.
27. # If you want you can bind a single interface, if the bind option is not
28. # specified all the interfaces will listen for incoming connections.
29. #
30. bind 127.0.0.1
31.
32. # Specify the path for the unix socket that will be used to listen for
33. # incoming connections. There is no default, so Redis will not listen
34. # on a unix socket when not specified.
35. #
36. # unixsocket /tmp/redis.sock
37. # unixsocketperm 755
38.
39. # Close the connection after a client is idle for N seconds (0 to disable)
40. timeout 600
41.
42. # Set server verbosity to 'debug'
43. # it can be one of:
44. # debug (a lot of information, useful for development/testing)
45. # verbose (many rarely useful info, but not a mess like the debug level)
46. # notice (moderately verbose, what you want in production probably)
47. # warning (only very important / critical messages are logged)
48. loglevel verbose
49.
50. # Specify the log file name. Also 'stdout' can be used to force
51. # Redis to log on the standard output. Note that if you use standard
52. # output for logging but daemonize, logs will be sent to /dev/null
53. logfile stdout
54.
55. # To enable logging to the system logger, just set 'syslog-enabled' to yes,
56. # and optionally update the other syslog parameters to suit your needs.
57. # syslog-enabled no
58.
59. # Specify the syslog identity.
60. # syslog-ident redis
61.
62. # Specify the syslog facility. Must be USER or between LOCAL0-LOCAL7.
63. # syslog-facility local0
64.
65. # Set the number of databases. The default database is DB 0, you can select
66. # a different one on a per-connection basis using SELECT <dbid> where
67. # dbid is a number between 0 and 'databases'-1
68. databases 16
69.
70. ################################ SNAPSHOTTING #################################
71. #
72. # Save the DB on disk:
73. #
74. # save <seconds> <changes>
75. #
76. # Will save the DB if both the given number of seconds and the given
77. # number of write operations against the DB occurred.
78. #
79. # In the example below the behaviour will be to save:
80. # after 900 sec (15 min) if at least 1 key changed
81. # after 300 sec (5 min) if at least 10 keys changed
82. # after 60 sec if at least 10000 keys changed
83. #
84. # Note: you can disable saving at all commenting all the "save" lines.
85.
86. save 900 1
87. save 300 10
88. save 60 10000
89.
90. # Compress string objects using LZF when dump .rdb databases?
91. # For default that's set to 'yes' as it's almost always a win.
92. # If you want to save some CPU in the saving child set it to 'no' but
93. # the dataset will likely be bigger if you have compressible values or keys.
94. rdbcompression yes
95.
96. # The filename where to dump the DB
97. dbfilename dump.rdb
98.
99. # The working directory.
100. #
101. # The DB will be written inside this directory, with the filename specified
102. # above using the 'dbfilename' configuration directive.
103. #
104. # Also the Append Only File will be created inside this directory.
105. #
106. # Note that you must specify a directory here, not a file name.
107. dir /usr/local/redis_db
108.
109. ################################# REPLICATION #################################
110.
111. # Master-Slave replication. Use slaveof to make a Redis instance a copy of
112. # another Redis server. Note that the configuration is local to the slave
113. # so for example it is possible to configure the slave to save the DB with a
114. # different interval, or to listen to another port, and so on.
115. #
116. # slaveof <masterip> <masterport>
117.
118. # If the master is password protected (using the "requirepass" configuration
119. # directive below) it is possible to tell the slave to authenticate before
120. # starting the replication synchronization process, otherwise the master will
121. # refuse the slave request.
122. #
123. # masterauth <master-password>
124.
125. # When a slave lost the connection with the master, or when the replication
126. # is still in progress, the slave can act in two different ways:
127. #
128. # 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will
129. # still reply to client requests, possibly with out of data data, or the
130. # data set may just be empty if this is the first synchronization.
131. #
132. # 2) if slave-serve-stale data is set to 'no' the slave will reply with
133. # an error "SYNC with master in progress" to all the kind of commands
134. # but to INFO and SLAVEOF.
135. #
136. slave-serve-stale-data yes
137.
138. ################################## SECURITY ###################################
139.
140. # Require clients to issue AUTH <PASSWORD> before processing any other
141. # commands. This might be useful in environments in which you do not trust
142. # others with access to the host running redis-server.
143. #
144. # This should stay commented out for backward compatibility and because most
145. # people do not need auth (e.g. they run their own servers).
146. #
147. # Warning: since Redis is pretty fast an outside user can try up to
148. # 150k passwords per second against a good box. This means that you should
149. # use a very strong password otherwise it will be very easy to break.
150. #
151. # requirepass foobared
152.
153. # Command renaming.
154. #
155. # It is possilbe to change the name of dangerous commands in a shared
156. # environment. For instance the CONFIG command may be renamed into something
157. # of hard to guess so that it will be still available for internal-use
158. # tools but not available for general clients.
159. #
160. # Example:
161. #
162. # rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
163. #
164. # It is also possilbe to completely kill a command renaming it into
165. # an empty string:
166. #
167. # rename-command CONFIG ""
168.
169. ################################### LIMITS ####################################
170.
171. # Set the max number of connected clients at the same time. By default there
172. # is no limit, and it's up to the number of file descriptors the Redis process
173. # is able to open. The special value '0' means no limits.
174. # Once the limit is reached Redis will close all the new connections sending
175. # an error 'max number of clients reached'.
176. #
177. # maxclients 128
178.
179. # Don't use more memory than the specified amount of bytes.
180. # When the memory limit is reached Redis will try to remove keys with an
181. # EXPIRE set. It will try to start freeing keys that are going to expire
182. # in little time and preserve keys with a longer time to live.
183. # Redis will also try to remove objects from free lists if possible.
184. #
185. # If all this fails, Redis will start to reply with errors to commands
186. # that will use more memory, like SET, LPUSH, and so on, and will continue
187. # to reply to most read-only commands like GET.
188. #
189. # WARNING: maxmemory can be a good idea mainly if you want to use Redis as a
190. # 'state' server or cache, not as a real DB. When Redis is used as a real
191. # database the memory usage will grow over the weeks, it will be obvious if
192. # it is going to use too much memory in the long run, and you'll have the time
193. # to upgrade. With maxmemory after the limit is reached you'll start to get
194. # errors for write operations, and this may even lead to DB inconsistency.
195. #
196. # maxmemory <bytes>
197.
198. # MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
199. # is reached? You can select among five behavior:
200. #
201. # volatile-lru -> remove the key with an expire set using an LRU algorithm
202. # allkeys-lru -> remove any key accordingly to the LRU algorithm
203. # volatile-random -> remove a random key with an expire set
204. # allkeys->random -> remove a random key, any key
205. # volatile-ttl -> remove the key with the nearest expire time (minor TTL)
206. # noeviction -> don't expire at all, just return an error on write operations
207. #
208. # Note: with all the kind of policies, Redis will return an error on write
209. # operations, when there are not suitable keys for eviction.
210. #
211. # At the date of writing this commands are: set setnx setex append
212. # incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
213. # sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
214. # zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
215. # getset mset msetnx exec sort
216. #
217. # The default is:
218. #
219. # maxmemory-policy volatile-lru
220.
221. # LRU and minimal TTL algorithms are not precise algorithms but approximated
222. # algorithms (in order to save memory), so you can select as well the sample
223. # size to check. For instance for default Redis will check three keys and
224. # pick the one that was used less recently, you can change the sample size
225. # using the following configuration directive.
226. #
227. # maxmemory-samples 3
228.
229. ############################## APPEND ONLY MODE ###############################
230.
231. # By default Redis asynchronously dumps the dataset on disk. If you can live
232. # with the idea that the latest records will be lost if something like a crash
233. # happens this is the preferred way to run Redis. If instead you care a lot
234. # about your data and don't want to that a single record can get lost you should
235. # enable the append only mode: when this mode is enabled Redis will append
236. # every write operation received in the file appendonly.aof. This file will
237. # be read on startup in order to rebuild the full dataset in memory.
238. #
239. # Note that you can have both the async dumps and the append only file if you
240. # like (you have to comment the "save" statements above to disable the dumps).
241. # Still if append only mode is enabled Redis will load the data from the
242. # log file at startup ignoring the dump.rdb file.
243. #
244. # IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append
245. # log file in background when it gets too big.
246.
247. appendonly yes
248.
249. # The name of the append only file (default: "appendonly.aof")
250. appendfilename appendonly.aof
251.
252. # The fsync() call tells the Operating System to actually write data on disk
253. # instead to wait for more data in the output buffer. Some OS will really flush
254. # data on disk, some other OS will just try to do it ASAP.
255. #
256. # Redis supports three different modes:
257. #
258. # no: don't fsync, just let the OS flush the data when it wants. Faster.
259. # always: fsync after every write to the append only log . Slow, Safest.
260. # everysec: fsync only if one second passed since the last fsync. Compromise.
261. #
262. # The default is "everysec" that's usually the right compromise between
263. # speed and data safety. It's up to you to understand if you can relax this to
264. # "no" that will will let the operating system flush the output buffer when
265. # it wants, for better performances (but if you can live with the idea of
266. # some data loss consider the default persistence mode that's snapshotting),
267. # or on the contrary, use "always" that's very slow but a bit safer than
268. # everysec.
269. #
270. # If unsure, use "everysec".
271.
272. # appendfsync always
273. appendfsync everysec
274. # appendfsync no
275.
276. # When the AOF fsync policy is set to always or everysec, and a background
277. # saving process (a background save or AOF log background rewriting) is
278. # performing a lot of I/O against the disk, in some Linux configurations
279. # Redis may block too long on the fsync() call. Note that there is no fix for
280. # this currently, as even performing fsync in a different thread will block
281. # our synchronous write(2) call.
282. #
283. # In order to mitigate this problem it's possible to use the following option
284. # that will prevent fsync() from being called in the main process while a
285. # BGSAVE or BGREWRITEAOF is in progress.
286. #
287. # This means that while another child is saving the durability of Redis is
288. # the same as "appendfsync none", that in pratical terms means that it is
289. # possible to lost up to 30 seconds of log in the worst scenario (with the
290. # default Linux settings).
291. #
292. # If you have latency problems turn this to "yes". Otherwise leave it as
293. # "no" that is the safest pick from the point of view of durability.
294. no-appendfsync-on-rewrite no
295.
296. # Automatic rewrite of the append only file.
297. # Redis is able to automatically rewrite the log file implicitly calling
298. # BGREWRITEAOF when the AOF log size will growth by the specified percentage.
299. #
300. # This is how it works: Redis remembers the size of the AOF file after the
301. # latest rewrite (or if no rewrite happened since the restart, the size of
302. # the AOF at startup is used).
303. #
304. # This base size is compared to the current size. If the current size is
305. # bigger than the specified percentage, the rewrite is triggered. Also
306. # you need to specify a minimal size for the AOF file to be rewritten, this
307. # is useful to avoid rewriting the AOF file even if the percentage increase
308. # is reached but it is still pretty small.
309. #
310. # Specify a precentage of zero in order to disable the automatic AOF
311. # rewrite feature.
312.
313. auto-aof-rewrite-percentage 100
314. auto-aof-rewrite-min-size 64mb
315.
316. ################################## SLOW LOG ###################################
317.
318. # The Redis Slow Log is a system to log queries that exceeded a specified
319. # execution time. The execution time does not include the I/O operations
320. # like talking with the client, sending the reply and so forth,
321. # but just the time needed to actually execute the command (this is the only
322. # stage of command execution where the thread is blocked and can not serve
323. # other requests in the meantime).
324. #
325. # You can configure the slow log with two parameters: one tells Redis
326. # what is the execution time, in microseconds, to exceed in order for the
327. # command to get logged, and the other parameter is the length of the
328. # slow log. When a new command is logged the oldest one is removed from the
329. # queue of logged commands.
330.
331. # The following time is expressed in microseconds, so 1000000 is equivalent
332. # to one second. Note that a negative number disables the slow log, while
333. # a value of zero forces the logging of every command.
334. slowlog-log-slower-than 10000
335.
336. # There is no limit to this length. Just be aware that it will consume memory.
337. # You can reclaim memory used by the slow log with SLOWLOG RESET.
338. slowlog-max-len 1024
339.
340. ################################ VIRTUAL MEMORY ###############################
341.
342. ### WARNING! Virtual Memory is deprecated in Redis 2.4
343. ### The use of Virtual Memory is strongly discouraged.
344.
345. # Virtual Memory allows Redis to work with datasets bigger than the actual
346. # amount of RAM needed to hold the whole dataset in memory.
347. # In order to do so very used keys are taken in memory while the other keys
348. # are swapped into a swap file, similarly to what operating systems do
349. # with memory pages.
350. #
351. # To enable VM just set 'vm-enabled' to yes, and set the following three
352. # VM parameters accordingly to your needs.
353.
354. vm-enabled no
355. #vm-enabled yes
356.
357. # This is the path of the Redis swap file. As you can guess, swap files
358. # can't be shared by different Redis instances, so make sure to use a swap
359. # file for every redis process you are running. Redis will complain if the
360. # swap file is already in use.
361. #
362. # The best kind of storage for the Redis swap file (that's accessed at random)
363. # is a Solid State Disk (SSD).
364. #
365. # *** WARNING *** if you are using a shared hosting the default of putting
366. # the swap file under /tmp is not secure. Create a dir with access granted
367. # only to Redis user and configure Redis to create the swap file there.
368. vm-swap-file /tmp/redis.swap
369.
370. # vm-max-memory configures the VM to use at max the specified amount of
371. # RAM. Everything that deos not fit will be swapped on disk *if* possible, that
372. # is, if there is still enough contiguous space in the swap file.
373. #
374. # With vm-max-memory 0 the system will swap everything it can. Not a good
375. # default, just specify the max amount of RAM you can in bytes, but it's
376. # better to leave some margin. For instance specify an amount of RAM
377. # that's more or less between 60 and 80% of your free RAM.
378. vm-max-memory 0
379.
380. # Redis swap files is split into pages. An object can be saved using multiple
381. # contiguous pages, but pages can't be shared between different objects.
382. # So if your page is too big, small objects swapped out on disk will waste
383. # a lot of space. If you page is too small, there is less space in the swap
384. # file (assuming you configured the same number of total swap file pages).
385. #
386. # If you use a lot of small objects, use a page size of 64 or 32 bytes.
387. # If you use a lot of big objects, use a bigger page size.
388. # If unsure, use the default :)
389. vm-page-size 32
390.
391. # Number of total memory pages in the swap file.
392. # Given that the page table (a bitmap of free/used pages) is taken in memory,
393. # every 8 pages on disk will consume 1 byte of RAM.
394. #
395. # The total swap size is vm-page-size * vm-pages
396. #
397. # With the default of 32-bytes memory pages and 134217728 pages Redis will
398. # use a 4 GB swap file, that will use 16 MB of RAM for the page table.
399. #
400. # It's better to use the smallest acceptable value for your application,
401. # but the default is large in order to work in most conditions.
402. vm-pages 134217728
403.
404. # Max number of VM I/O threads running at the same time.
405. # This threads are used to read/write data from/to swap file, since they
406. # also encode and decode objects from disk to memory or the reverse, a bigger
407. # number of threads can help with big objects even if they can't help with
408. # I/O itself as the physical device may not be able to couple with many
409. # reads/writes operations at the same time.
410. #
411. # The special value of 0 turn off threaded I/O and enables the blocking
412. # Virtual Memory implementation.
413. vm-max-threads 4
414.
415. ############################### ADVANCED CONFIG ###############################
416.
417. # Hashes are encoded in a special way (much more memory efficient) when they
418. # have at max a given numer of elements, and the biggest element does not
419. # exceed a given threshold. You can configure this limits with the following
420. # configuration directives.
421. hash-max-zipmap-entries 512
422. hash-max-zipmap-value 64
423.
424. # Similarly to hashes, small lists are also encoded in a special way in order
425. # to save a lot of space. The special representation is only used when
426. # you are under the following limits:
427. list-max-ziplist-entries 512
428. list-max-ziplist-value 64
429.
430. # Sets have a special encoding in just one case: when a set is composed
431. # of just strings that happens to be integers in radix 10 in the range
432. # of 64 bit signed integers.
433. # The following configuration setting sets the limit in the size of the
434. # set in order to use this special memory saving encoding.
435. set-max-intset-entries 512
436.
437. # Similarly to hashes and lists, sorted sets are also specially encoded in
438. # order to save a lot of space. This encoding is only used when the length and
439. # elements of a sorted set are below the following limits:
440. zset-max-ziplist-entries 128
441. zset-max-ziplist-value 64
442.
443. # Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
444. # order to help rehashing the main Redis hash table (the one mapping top-level
445. # keys to values). The hash table implementation redis uses (see dict.c)
446. # performs a lazy rehashing: the more operation you run into an hash table
447. # that is rhashing, the more rehashing "steps" are performed, so if the
448. # server is idle the rehashing is never complete and some more memory is used
449. # by the hash table.
450. #
451. # The default is to use this millisecond 10 times every second in order to
452. # active rehashing the main dictionaries, freeing memory when possible.
453. #
454. # If unsure:
455. # use "activerehashing no" if you have hard latency requirements and it is
456. # not a good thing in your environment that Redis can reply form time to time
457. # to queries with 2 milliseconds delay.
458. #
459. # use "activerehashing yes" if you don't have such hard requirements but
460. # want to free memory asap when possible.
461. activerehashing yes
462.
463. ################################## INCLUDES ###################################
464.
465. # Include one or more other config files here. This is useful if you
466. # have a standard template that goes to all redis server but also need
467. # to customize a few per-server settings. Include files can include
468. # other files, so use this wisely.
469. #
470. # include /path/to/local.conf
471. # include /path/to/other.conf
中文说明:
1,是否以后台进程运行,默认为no
daemonize no
2,如以后台进程运行,则需指定一个pid,默认为/var/run/redis.pid
pidfile /var/run/redis.pid
3,监听端口,默认为6379
port 6379
4,绑定主机IP,默认值为127.0.0.1(注释)
bind 127.0.0.1
5,超时时间,默认为300(秒)
timeout 300
6,日志记录等级,有4个可选值,debug,verbose(默认值),notice,warning
loglevel verbose
7,日志记录方式,默认值为stdout
logfile stdout
8,可用数据库数,默认值为16,默认数据库为0
databases 16
9,指出在多长时间内,有多少次更新操作,就将数据同步到数据文件。这个可以多个条件配合,比如默认配置文件中的设置,就设置了三个条件。
900秒(15分钟)内至少有1个key被改变
save 900 1
300秒(5分钟)内至少有10个key被改变
save 300 10
10,存储至本地数据库时是否压缩数据,默认为yes
rdbcompression yes
11,本地数据库文件名,默认值为dump.rdb
dbfilename /root/redis_db/dump.rdb
12,本地数据库存放路径,默认值为 ./
dir /root/redis_db/
13,当本机为从服务时,设置主服务的IP及端口(注释)
slaveof <masterip> <masterport>
14,当本机为从服务时,设置主服务的连接密码(注释)
masterauth <master-password>
15,连接密码(注释)
requirepass foobared
16,最大客户端连接数,默认不限制(注释)
maxclients 128
17,设置最大内存,达到最大内存设置后,Redis会先尝试清除已到期或即将到期的Key,当此方法处理后,任到达最大内存设置,将无法再进行写入操作。(注释)
maxmemory <bytes>
18,是否在每次更新操作后进行日志记录,如果不开启,可能会在断电时导致一段时间内的数据丢失。因为redis本身同步数据文件是按上面save条件来同步的,所以有的数据会在一段时间内只存在于内存中。默认值为no
appendonly yes
19,更新日志文件名,默认值为appendonly.aof(注释)
appendfilename /root/redis_db/appendonly.aof
20,更新日志条件,共有3个可选值。no表示等操作系统进行数据缓存同步到磁盘,always表示每次更新操作后手动调用fsync()将数据写到磁盘,everysec表示每秒同步一次(默认值)。
appendfsync everysec
21,是否使用虚拟内存,默认值为no
vm-enabled yes
22,虚拟内存文件路径,默认值为/tmp/redis.swap,不可多个Redis实例共享
vm-swap-file /tmp/redis.swap
23,将所有大于vm-max-memory的数据存入虚拟内存,无论vm-max-memory设置多小,所有索引数据都是内存存储的 (Redis的索引数据就是keys),也就是说,当vm-max-memory设置为0的时候,其实是所有value都存在于磁盘。默认值为0。
vm-max-memory 0
24,虚拟内存文件以块存储,每块32bytes
vm-page-size 32
25,虚拟内在文件的最大数
vm-pages 134217728
26,可以设置访问swap文件的线程数,设置最好不要超过机器的核数,如果设置为0,那么所有对swap文件的操作都是串行的.可能会造成比较长时间的延迟,但是对数据完整性有很好的保证.
vm-max-threads 4
27,把小的输出缓存放在一起,以便能够在一个TCP packet中为客户端发送多个响应,具体原理和真实效果我不是很清楚。所以根据注释,你不是很确定的时候就设置成yes
glueoutputbuf yes
28,在redis 2.0中引入了hash数据结构。当hash中包含超过指定元素个数并且最大的元素没有超过临界时,hash将以一种特殊的编码方式(大大减少内存使用)来存储,这里可以设置这两个临界值
hash-max-zipmap-entries 64
29,hash中一个元素的最大值
hash-max-zipmap-value 512
30,开启之后,redis将在每100毫秒时使用1毫秒的CPU时间来对redis的hash表进行重新hash,可以降低内存的使用。当你的使 用场景中,有非常严格的实时性需要,不能够接受Redis时不时的对请求有2毫秒的延迟的话,把这项配置为no。如果没有这么严格的实时性要求,可以设置 为yes,以便能够尽可能快的释放内存
activerehashing yes