1. Redis overview
1.1 Introduction to Redis
Redis is an open source, high-performance key-value database developed in C language. It provides a variety of key-value data types to adapt to storage needs in different scenarios. The key-value data types supported by Redis so far are as follows:
-
string type
-
Hash type
-
list type
-
Collection type
-
ordered set type
1.2 Redis application scenarios
-
Caching (data query, short connection, news content, product content, etc.). ( most used )
-
Session separation in distributed cluster architecture.
-
Chat room's online friends list.
-
Task queue. (Flash sale, rush sale, 12306, etc.)
-
Application rankings.
-
Website visit statistics.
-
Data expiration processing (accurate to milliseconds)
1.3 Features of Redis
-
Redis data access speed is fast (data is in memory)
-
Redis has a data persistence mechanism (there are two persistence mechanisms: 1. Regularly dumping memory data to disk; 2. Aof (append only file) persistence mechanism - recording each data update operation in a log format. Once In the event of a disaster, the entire database can be restored through log replay)
-
redis supports cluster mode (capacity can be expanded linearly)
-
Compared with other caching tools (ehcache/memcached), redis has a distinct advantage: it supports rich data structures
2. Redis installation
2.1 Download Redis
Download address: Download | Redis
Source package download address: Redis · GitHub
Official address: Redis
2.2 Redis installation environment
Redis installation is generally installed under a Linux system, and because redis is developed using C language, a C language environment is required.
-
Linux：CentOS-7.7
-
VMware：15.5
-
C locale:
2.3 Redis installation
Step 1: Install CentOS system (Linux) in VMware.
Step 2: Install the c language environment in the Linux system
# Test whether the server has internet access [root@qianfeng01 ~]# ping www.baidu.com #Install C language environment [root@qianfeng01~]# yum -y install gcc-c++
Step 3: Upload the redis source code package to the Linux system.
Step 4: Unzip the source code package to the specified directory
[root@qianfeng01 ~]# tar -zxvf redis-4.0.14.tar.gz -C /usr/local/ # Enter directory [root@qianfeng01 ~]# cd /usr/local/redis-4.0.14/
Step 5: Compile the source code package
[root@qianfeng01 redis-4.0.14]# make
2.4 Redis startup
2.4.1 Front-end startup
The front end starts if the client is closed or the ctrl+c command is executed. The entire redis service will also stop.
Start the front end, that is, execute the following command in the client:
[root@qianfeng01 src]# cd .. [root@qianfeng01 redis-4.0.14]# src/redis-server redis.conf
2.4.2 Backend startup
Modify the redis.conf file
[root@qianfeng01 redis-4.0.14]# vim redis.conf
#Modify binding IP bind 192.168.10.101 127.0.0.1 #Modify the redis service as a daemon process daemonize yes #Log file location logfile "/usr/local/redis-4.0.14/redis.log" #Add the following content (set redis password) requirepass root #Data persistence directory (current directory) dir ./
Start the redis service:
# start up [root@qianfeng01 redis-4.0.14]# ./src/redis-server /usr/local/redis-4.0.14/redis.conf
Check whether it is started
# start up [root@qianfeng01 redis-4.0.14]# ps -ef | grep redis root 30562 1 0 09:16 ? 00:00:00 ./src/redis-server 192.168.10.111:6379 root 30591 1666 0 09:17 pts/1 00:00:00 grep --color=auto redis