un7.29: How to install and configure redis in Linux-centos?

1. What is Redis
Before introducing Redis, first understand that NoSQL (Not only SQL) is not only a non-relational database; Redis is a traditional non-relational database such as Mysql, oracle, sql server, etc.are relational databases

Why do you need NoSQL, mainly to deal with the following problems, traditional relational databases are not enough

1, High performance - high concurrent read and write
2, Huge Storage - efficient storage and access of massive data
3, High Scalablility && High Availability High scalability and high availability
4,NoSQL products, MongoDB, Redis, etc. Redis is currently mainstream

1.1, Features of NoSQL
Easy expansion
Flexible data model
Large data volume, high performance
High availability
High performance key-value database, supported key-value data types
String Type
List Type
Ordered Collection Type
Hash Type
Collection Type
1.2, Redis Application Scenarios
Cache
Task Queue
Website access statistics
Data expiration processing
Application rankings
Session separation in distributed cluster architecture
Second, Redis installation
Redis only supports Linux from the beginning, although there are teams behindCome up with a Window version, but I still recommend everyone to install it in Linux.

1. Install gcc
gcc compiles c, because redis is written in c, so let's install gcc first

yum install gcc-c++

2. Download the redis archive and extract it
wget method Download the redis archive, extract it, and compile it

Download:

wget http://download.redis.io/releases/redis-3.2.9.tar.gz

Unzip:

tar -zxvf redis-3.2.9.tar.gz

In this way, there is a wrongly decompressed redis directory in the /usr/local/ directory

3. Compile

Compilation is complete, go back to the /usr/local/ directory and find that the redis directory already exists

3. Start Redis
1. Copy the redis.conf file in the decompressed package to the compiled folder redis
2. Modify the redis.conf file and change the daemonize value to yes
3.Start redis
Check whether redis has been started by command

The redis process exists, indicating that it has been successfully started

3.4, close redis
Query the redis process has been closed by command

Fourth, the basic use of Redis
4.1, start Redis through the command line
4.2, execute the redis client
4.3, operate
4.3.1, store the name-value pair name:helloworld
Set by set method, get by get

4.3.2. Get the record value named name
4.4. Get all records
4.5. Delete records by key
5. Download resources
redis-3.2.9.tar

Six, open port number 6379
Reference: https://blog.csdn.net/qzc70919700/article/details/78940222

Seven, modify the bound host
This machine is bound here, we remark this; # bind 127.0.0.1

Close the redis service and restart redis

8. Modify the Redis access password
Modify the /usr/local/redis/redis.conf configuration file, remove the # in front of #requirepass foobared, and replace the password with your own password, for example: Aa123123.

#requirepass Aa123123.

After setting the password, if you want to enter the redis client next time, you need to enter the password, for example: ./bin/redis-cli -a Aa123123.

Nine, modify the protected mode
Need to modify the configuration file redis.conf.Change protected-mode yes under NETWORK to protected-mode no

Then restart the service