Redis is installed on Linux

Redis What is it? （ free , Open source ）

Redis Full name Remote Dictionary Server（ Remote dictionary service ）, It is a key value type non relation based on memory implementation （NoSQL） database , By the Italians Salvatore Sanfilippo Use C Language writing .

--- It's the hottest nosql One of characteristic

1 A variety of data types

2 Persistence

3 colony

4 thing

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NOsql What is it?

NoSQL（Not Only SQL）, namely Not only is SQL, Generally speaking Non relational database .

NoSQL Easy to expand ,NoSQL There are many kinds of databases （MongoDB、Redis  etc. ）, The common feature is to remove the relational characteristics of relational databases .

There is no relationship between the data , This makes it very easy to expand , Invisibly, it also brings scalable capabilities at the architecture level .

Big data NoSQL The database has very high read-write performance , It's because it's irrelevant , The structure of the database is simple .

NoSQL A typical example of a database is  Redis.

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Redis stay linux The installation of the

yum install gcc-c++
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 Prepare the environment in advance gcc because Redis yes c++ Written , Virtual machines cannot be used without a network yum Installed 

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download Redis 

Redis Official website ：

Redishttps://redis.io/

  Upload it to your server or virtual machine and decompress it

It is recommended to upload directly to opt below , Usually installed here

tar -zvxf  The version you downloaded 

compile （ Heard of gcc Environment compilation redis）

make

install

You can skip this step, but it is recommended to , Equivalent to the win The shortcut above , The default path is usr/local/bin below

make install

The configuration file

Redis It's through redis.conf To turn on the service , So you can copy multiple configuration files , Keep the original configuration file , Create a directory through which to start redis, Also is to redis.cinf Copy one to operate .

Generally, it is modification daemonize, however 6 It seems to be enabled by default, so there is no need to modify .

yes It's Jean redis Start the service in the background ,no Is to open the service

Configuration item name	Configuration item value range	explain
daemonize	yes、no	yes Indicates that the daemon is enabled , The default is no That is, it does not run as a daemon . among Windows Running in daemon mode is not supported under the system
port		Appoint Redis Listening port , The default port is 6379
bind		The bound host address , If you need to set remote access, you can directly put this property under the comment or change it to bind * that will do , This property is the same as the following protected-mode Controls whether remote access is possible .
protected-mode	yes 、no	Protected mode , This mode controls whether the external network can be connected redis service , The default is yes, Therefore, by default, our external network is inaccessible , If you need an Internet connection rendis The service needs to change this attribute to no.
timeout	300	Close the connection after how long the client is idle , If specified as 0, Indicates that the feature is turned off
loglevel	debug、verbose、notice、warning	The level of logging , The default is notice
databases	16	Set the number of databases , The default database is 0. The whole can be seen through the client tool
rdbcompression	yes、no	Specifies whether data is compressed when stored to a local database , The default is yes,Redis use LZF Compress , If in order to save money CPU Time , This option can be turned off , But it can make the database files huge .
dbfilename	dump.rdb	Specifies the local database file name , The default value is dump.rdb
dir		Specifies the local database hosting directory
requirepass		Set up Redis Connect the password , If the connection password is configured , The client is connecting Redis Need to go through AUTH <password> Command provide password , Off by default
maxclients	0	Sets the maximum number of client connections at one time , Default limit ,Redis The number of client connections that can be opened simultaneously is Redis The maximum number of file descriptors that a process can open , If you set maxclients 0, No restrictions . When the number of client connections reaches the limit ,Redis The new connection is closed and returned to the client max number of clients reached error message .
maxmemory	XXX <bytes>	Appoint Redis Maximum memory limit ,Redis Data is loaded into memory at startup , After reaching the maximum memory ,Redis It will first try to clear those that are due or are about to expire Key, When this method is handled after , Still reaches the maximum memory setting , Will no longer be able to write , But you can still do a read .Redis new vm Mechanism , Will be able to Key Storage memory ,Value Will be stored in a swap District . Configuration item value range column XXX Is the value .

  Start the service

redis-server /redis.conf  Address, such as me redis.conf stay qwe Next I will 
redis-server qwe/redis.conf

such redis The installation is successful  

Use find redis-cli Under the table of contents

redis-cli  Local connection redis A command of the service , After this command, you can enter redis Script console .

redis-cli -p 6379  Open the success 
 Input ping
 Output PONG
 It can be used normally.