& 在Ubuntu中安装Redis
在Ubuntu中安装Redis
，主要介绍通过R语言连接使用nosql数据库。涉及的NoSQL产品，包括, , , , , 。希望通过我的介绍让广大的R语言爱好者，有更多的开发选择，做出更多地激动人心的应用。
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Redis是常用基于内存的Key-Value数据库，比Memcache更先进，支持多种数据结构，高效，快速。用Redis可以很轻松解决高并发的数据访问问题；做为时时监控信号处理也非常不错。
Redis在Windows中安装
Redis在Linux Ubuntu中安装
通过命令行客户端访问Redis
修改Redis的配置
1. Redis在Windows中安装
在Windows系统上安装Redis数据库是件非常简单的事情，下载可执行安装文件(exe)，双击安装即可。下载地址：
Redis服务器运行命令：Redis安装目录/redis-server.exe
Redis客户端运行命令：Redis安装目录/redis-cli.exe
2. Redis在Linux Ubuntu中安装
本文使用的Linux是Ubuntu 12.04.2 LTS 64bit的系统，安装Redis数据库软件包可以通过apt-get实现。
在Linux Ubuntu中安装Redis数据库
#安装Redis服务器端
~ sudo apt-get install redis-server
安装完成后，Redis服务器会自动启动，我们检查Redis服务器程序
# 检查Redis服务器系统进程
~ ps -aux|grep redis
0:00 /usr/bin/redis-server /etc/redis/redis.conf
0:00 grep --color=auto redis
# 通过启动命令检查Redis服务器状态
~ netstat -nlt|grep 6379
0 127.0.0.1:6379
# 通过启动命令检查Redis服务器状态
~ sudo /etc/init.d/redis-server status
redis-server is running
3. 通过命令行客户端访问Redis
安装Redis服务器，会自动地一起安装Redis命令行客户端程序。
在本机输入redis-cli命令就可以启动，客户端程序访问Redis服务器。
~ redis-cli
redis 127.0.0.1:6379>
# 命令行的帮助
redis 127.0.0.1:6379> help
redis-cli 2.2.12
Type: "help @" to get a list of commands in
"help " for help on
"help " to get a list of possible help topics
"quit" to exit
# 查看所有的key列表
redis 127.0.0.1:6379> keys *
(empty list or set)
基本的Redis客户端命令操作
增加一条字符串记录key1
# 增加一条记录key1
redis 127.0.0.1:6379> set key1 "hello"
# 打印记录
redis 127.0.0.1:6379> get key1
增加一条数字记录key2
# 增加一条数字记录key2
set key2 1
# 让数字自增
redis 127.0.0.1:6379> INCR key2
(integer) 2
redis 127.0.0.1:6379> INCR key2
(integer) 3
# 打印记录
redis 127.0.0.1:6379> get key2
增加一条列表记录key3
# 增加一个列表记录key3
redis 127.0.0.1:6379> LPUSH key3 a
(integer) 1
# 从左边插入列表
redis 127.0.0.1:6379> LPUSH key3 b
(integer) 2
# 从右边插入列表
redis 127.0.0.1:6379> RPUSH key3 c
(integer) 3
# 打印列表记录，按从左到右的顺序
redis 127.0.0.1:6379> LRANGE key3 0 3
增加一条哈希表记录key4
# 增加一个哈希记表录key4
redis 127.0.0.1:6379> HSET key4 name "John Smith"
(integer) 1
# 在哈希表中插入，email的Key和Value的值
redis 127.0.0.1:6379> HSET key4 email ""
(integer) 1
# 打印哈希表中，name为key的值
redis 127.0.0.1:6379> HGET key4 name
"John Smith"
# 打印整个哈希表
redis 127.0.0.1:6379> HGETALL key4
2) "John Smith"
3) "email"
增加一条哈希表记录key5
# 增加一条哈希表记录key5，一次插入多个Key和value的值
redis 127.0.0.1:6379> HMSET key5 username antirez password P1pp0 age 3
# 打印哈希表中，username和age为key的值
redis 127.0.0.1:6379> HMGET key5 username age
1) "antirez"
# 打印完整的哈希表记录
redis 127.0.0.1:6379> HGETALL key5
1) "username"
2) "antirez"
3) "password"
4) "P1pp0"
# 查看所有的key列表
redis 127.0.0.1:6379> keys *
# 删除key1,key5
redis 127.0.0.1:6379> del key1
(integer) 1
redis 127.0.0.1:6379> del key5
(integer) 1
# 查看所有的key列表
redis 127.0.0.1:6379> keys *
4. 修改Redis的配置
4.1 使用Redis的访问账号
默认情况下，访问Redis服务器是不需要密码的，为了增加安全性我们需要设置Redis服务器的访问密码。设置访问密码为redisredis。
用vi打开Redis服务器的配置文件redis.conf
~ sudo vi /etc/redis/redis.conf
#取消注释requirepass
requirepass redisredis
4.2 让Redis服务器被远程访问
默认情况下，Redis服务器不允许远程访问，只允许本机访问，所以我们需要设置打开远程访问的功能。
用vi打开Redis服务器的配置文件redis.conf
~ sudo vi /etc/redis/redis.conf
#bind 127.0.0.1
修改后，重启Redis服务器。
~ sudo /etc/init.d/redis-server restart
Stopping redis-server: redis-server.
Starting redis-server: redis-server.
未使用密码登陆Redis服务器
~ redis-cli
redis 127.0.0.1:6379> keys *
(error) ERR operation not permitted
发现可以登陆，但无法执行命令了。
登陆Redis服务器，输入密码
redis-cli -a redisredis
redis 127.0.0.1:6379> keys *
登陆后，一切正常。
我们检查Redis的网络监听端口
检查Redis服务器占用端口
~ netstat -nlt|grep 6379
0 0.0.0.0:6379
我们看到从之间的网络监听从 127.0.0.1:3306 变成 0 0.0.0.0:3306，表示Redis已经允许远程登陆访问。
我们在远程的另一台Linux访问Redis服务器
~ redis-cli -a redisredis -h 192.168.1.199
redis 192.168.1.199:6379> keys *
远程访问正常。通过上面的操作，我们就把Redis数据库服务器，在Linux Ubuntu中的系统安装完成。
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