Approaching Redis (i)--redis installation and basic key operation

Redis is an open-source NoSQL key-value storage System. Redis is often mentioned with MemCache , but compared to MemCache ,redis is a database that can persist data, while Redis The data structure is rich--string, hash, list, set, sorted set.

1. Install and start Redis:

[Email protected] ~]# cd/usr/local/src[[email protected] src]# wget http://download.redis.io/releases/ Redis-3.0.0.tar.gz[[email protected] src]# tar-zxf redis-3.0.0.tar.gz

Unlike most other software that is compiled and installed, Redis has done ./configure, so direct make&& make install :

[Email protected] src]# CD Redis-3.0.0[[email protected] redis-3.0.0]# makezmalloc.h:50:31:error:jemalloc/jemalloc.h : No such file or directoryzmalloc.h:55:2:error: #error "Newer version of Jemalloc required" make[1]: ***[ADLIST.O] Error 1

through the error message is not difficult to find,jemalloc version is too low, with the Yum command installation:

[email protected] redis-3.0.0]# yum install-y jemalloc-devel[[email protected] redis-3.0.0]# MAKECC:.. /deps/hiredis/libhiredis.a:no such file or DIRECTORYCC:.. /deps/lua/src/liblua.a:no such file or DIRECTORYCC:.. /deps/jemalloc/lib/libjemalloc.a:no such file or directorymake[1]: ***[redis-server] Error 1[[email protected] redis-3.0.0]# yum install-y hiredis-devel[[email protected] redis-3.0.0]# yum install-y lua-devel

after installing these libraries, if the same No such file or directory error is still reported under the PWD directory , it can be resolved by re- compiling the Redis source package again:

[Email protected] src]# tar-zxf redis-3.0.0.tar.gz-c/usr/local/[[email protected] src]# Cd/usr/local/redis-3.0.0[[em AIL protected] redis-3.0.0]# makehint:it ' s agood idea-to-run ' make test ';) make[1]: leavingdirectory '/usr/local/redis-3. 0.0/src '

The above information indicates that the compilation installation was successful, at which point we need to use a binary file located under/usr/local/redis-3.0.0/src/, respectively:

(1)Redis-benchmark -- for redis performance Testing

(2)redis-check-aof -- tools for checking the AOF log

(3)redis-check-dump -- tools for checking the RBD log

(4)redis-server -- redis Server process

(5)redis-cli -- redis client Process

(6)Redis-sentinel -- Soft link file, soft link to redis-server

of course, for convenience, we can also install these binaries separately in other directories (here PREFIX need to use uppercase):

[[email protected] redis-3.0.0]# make install Prefix=/usr/local/redis[[email protected] redis]# Ls/usr/local/redis/bin /redis-benchmark redis-check-dump redis-sentinelredis-check-aof redis-cli redis-server

This allows all of our available binaries to be moved to the specified directory. Also for easy configuration, copy a Redis profile to the installation directory:

[Email protected] redis]# cp/usr/local/redis-3.0.0/redis.conf.

in this way, we can start with the following command Redis server , the following ./redis.conf Specifies that the Redis server is using the redis.conf configuration file under the current directory:

[Email protected] redis]# bin/redis-server./redis.conf

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/6C/3F/wKioL1VCTLmRHfOmAAHumJzWmUA081.jpg "title=" Redis.png "alt=" Wkiol1vctlmrhfomaahumjzwmua081.jpg "/>

Figure -1 Redis Boot Success page

if the command runs after 1 , it indicates a successful start. The default port for Redis is 6379. At this point, open a new shelland use the following command to connect to the Redis server using a redis client :

[Email protected] ~]#/usr/local/redis/redis-cli-h 127.0.0.1-p 6379

where-h specifies the Redis server IP ,-p specifies the Redis server port. If not explicitly specified, the 127.0.0.1:6379 is connected . After the command executes, the following line appears to indicate that the connection was successful:

127.0.0.1:6379>

If you want to close Redis Server, use the following command:

[Email protected] ~]#/usr/local/redis/bin/redis-cli-h 127.0.0.1-p6379 shutdown

2.Redis Operation Key :

Use the following command on the Redis Client command line to operate on key :

(1) Increase and check Key-value:

127.0.0.1:6379> set name lucyok127.0.0.1:6379> get Name "Lucy" 127.0.0.1:6379> set sex female127.0.0.1:6379> Set Job nurse127.0.0.1:6379> keys *//Three regular match symbols can be used, *? [] 1) "Job" 2) "Sex" 3) "name" 127.0.0.1:6379> keys n?me1) "name" 127.0.0.1:6379> keys j[abco]b1) "Job"

(2 ) Delete key:

127.0.0.1:6379> del Job (integer) 1//return 1 indicates successful operation, return 0 indicates operation failed

(3) change key:

127.0.0.1:6379> set sex maleok127.0.0.1:6379> rename sex personsex//Whether or not Personsex is present, renaming will succeed ok127.0.0.1:6379 > Renamenx personsex Name//renamenx = Rename if new name does Notexist, that is, there will be no overwrite of the original Key-value (integer) 0//Return 1 indicates successful operation, Returns 0 indicates that the operation failed 127.0.0.1:6379> renamenx sex personsex (integer) 1//returns 1 indicating that the operation was successful and returning 0 indicates that the operation failed

(4) move key:

Redis has three storage spaces by default, which can be easily understood as the number of sheets, numbered 0-16. By default, all Key-value are located under 0 tables and can be moved to the specified numbered table using the Move command, which selects the table with the specified number:

127.0.0.1:6379> move name 1 (integer) 1127.0.0.1:6379> keys *) "Sex" 127.0.0.1:6379> Select 1ok127.0.0.1:6379[1 ]> keys *) "name"

(5) return random key:

127.0.0.1:6379> randomkey "name" 127.0.0.1:6379> randomkey "name" 127.0.0.1:6379> randomkey "Sex"

(6) whether the corresponding key exists:

127.0.0.1:6379> exists name (integer) 1//return 1 means present, return 0 means no 127.0.0.1:6379> exists person (integer) 0//return 1 indicates existence, Returns 0 indicating that there is no

(7) determine the type of key:

127.0.0.1:6379> type namestring127.0.0.1:6379> type Jobnone

the possible types are string, list, set, order set, hash, or none if key does not exist.

(8) query The key declaration period in seconds:

127.0.0.1:6379> ttl name (integer)-1//return-1 means permanent, return-2 means that key does not exist, and return n means n seconds expires 127.0.0.1:6379> ttl person (integer)- 2

to use in milliseconds, use the pttl command.

(9) set the key declaration period in seconds:

127.0.0.1:6379> expire name (integer) 1127.0.0.1:6379> ttl name (integer) 12

to use in milliseconds, use the pttl command.

(ten) to make the key permanently effective:

127.0.0.1:6379> expire name (integer) 1127.0.0.1:6379> persist name (integer) 1127.0.0.1:6379> ttl name ( Integer)-1

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Approaching Redis (i)--redis installation and basic key operation