Redis入门简介

Redis是一个开源的基于内存亦可持久化的日志型、Key-Value数据库，并提供多种语言的API。

Redis是一个key-value存储系统。 和Memcached缓存类似，Redis支持存储的value类型相对更多，包括string(字符串)、list(链表)、set(集合)、hash（哈希类型）。并且支持在服务器端计算集合的并，交和补集(difference)等，还支持多种排序功能。Redis也被看成是一个数据结构服务器。

Redis支持主从同步，数据可以从主服务器向任意数量的从服务器上同步，从服务器可以是关联其他从服务器的主服务器。

源码编译安装

下载源码包并解压

[root@redis ~]# cd /usr/src/
[root@redis src]# wget http://download.redis.io/releases/redis-5.0.5.tar.gz
[root@redis src]# tar -xzvf redis-5.0.5.tar.gz
[root@redis src]# ll
total 1932
drwxr-xr-x. 2 root root       6 Apr 11  2018 debug
drwxr-xr-x. 3 root root      35 Nov 25 23:05 kernels
drwxrwxr-x  6 root root     334 May 16  2019 redis-5.0.5
-rw-r--r--  1 root root 1975750 Jun 27  2020 redis-5.0.5.tar.gz
[root@redis src]# cd redis-5.0.5/
[root@redis redis-5.0.5]#

编辑指定路径

[root@redis redis-5.0.5]# vim src/Makefile

执行编译

[root@redis redis-5.0.5]# make && make install

如果不直接编辑上面的配置文件，也可以直接手动指定路径 make PREFIX=/usr/local/redis install

配置脚本启动服务

[root@redis redis-5.0.5]# ./utils/install_server.sh 
Welcome to the redis service installer
This script will help you easily set up a running redis serverPlease select the redis port for this instance: [6379] 
Selecting default: 6379
Please select the redis config file name [/etc/redis/6379.conf] /usr/local/redis/6379/6379.conf
Please select the redis log file name [/var/log/redis_6379.log] /usr/local/redis/6379/redis_6379.log
Please select the data directory for this instance [/var/lib/redis/6379] /usr/local/redis/6379
Please select the redis executable path [] /usr/local/redis/bin/redis-server
Selected config:
Port           : 6379
Config file    : /usr/local/redis/6379/6379.conf
Log file       : /usr/local/redis/6379/redis_6379.log
Data dir       : /usr/local/redis/6379
Executable     : /usr/local/redis/bin/redis-server
Cli Executable : /usr/local/redis/bin/redis-cli
Is this ok? Then press ENTER to go on or Ctrl-C to abort.
Copied /tmp/6379.conf => /etc/init.d/redis_6379
Installing service...
Successfully added to chkconfig!
Successfully added to runlevels 345!
Starting Redis server...
Installation successful!

此时服务已经启动，查看日志发现有三个警告

[root@redis redis-5.0.5]# tailf -n 50 /usr/local/redis/6379/redis_6379.log

根据此提示消除警告

[root@redis redis-5.0.5]# vim /etc/sysctl.conf

[root@redis redis-5.0.5]# sysctl -p
net.core.somaxconn = 512
vm.overcommit_memory = 1
[root@redis redis-5.0.5]# echo never > /sys/kernel/mm/transparent_hugepage/enabled

重启Redis服务并查看日志

[root@redis redis-5.0.5]# /etc/init.d/redis_6379 restart
Stopping ...
Redis stopped
Starting Redis server...[root@redis redis-5.0.5]# tailf -n 50 /usr/local/redis/6379/redis_6379.log

会发现此时无警告

进入Redis

[root@redis redis-5.0.5]# /usr/local/redis/bin/redis-cli 
127.0.0.1:6379>

此时Redis安装成功