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Redis简介:
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How to simply start redis in Linux

May 31, 2023 am 10:08 AM
linux redis

Redis是由c语言编写的远程字典服务,支持网络、可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简介:

  • Redis 是完全开源的,遵守 BSD 协议,是一个高性能的 key-value 数据库。

  • Redis支持数据的持久化,可以将内存中的数据保存在磁盘中,重启的时候可以再次加载进行使用。

  • Redis不仅仅支持简单的key-value类型的数据,同时还提供list,set,zset,hash等数据结构的存储。

  • Redis支持数据的备份,即master-slave模式的数据备份。

  • 性能极高 – Redis能读的速度是110000次/s,写的速度是81000次/s 。

  • 丰富的数据类型 – Redis支持二进制案例的 Strings, Lists, Hashes, Sets 及 Ordered Sets 数据类型操作。

  • 原子 – Redis的所有操作都是原子性的,意思就是要么成功执行要么失败完全不执行。单个操作是原子性的。多个操作也支持事务,即原子性,通过MULTI和EXEC指令包起来。

  • 丰富的特性 – Redis还支持 publish/subscribe, 通知, key 过期等等特性。

1.直接启动 进入redis根目录,执行命令:  #加上‘&’号使redis以后台程序方式运行

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nohup redis-server &

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2.通过指定配置文件启动 可以为redis服务启动指定配置文件,例如配置为/etc/redis/6379.conf 进入redis根目录,输入命令:

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./redis-server /etc/redis/6379.conf

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#如果更改了端口,使用redis-cli客户端连接时,也需要指定端口,例如:

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redis-cli -p 6380

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3.使用redis启动脚本设置开机自启动 启动脚本 redis_init_script 位于位于Redis的 /utils/ 目录下,redis_init_script脚本代码如下:

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#!/bin/sh

#

# Simple Redis init.d script conceived to work on Linux systems

# as it does use of the /proc filesystem.

  

#redis服务器监听的端口

REDISPORT=6379

  

#服务端所处位置

EXEC=/usr/local/bin/redis-server

  

#客户端位置

CLIEXEC=/usr/local/bin/redis-cli

  

#redis的PID文件位置,需要修改

PIDFILE=/var/run/redis_${REDISPORT}.pid

  

#redis的配置文件位置,需将${REDISPORT}修改为文件名

CONF="/etc/redis/${REDISPORT}.conf"

  

case "$1" in

    start)

        if [ -f $PIDFILE ]

        then

                echo "$PIDFILE exists, process is already running or crashed"

        else

                echo "Starting Redis server..."

                $EXEC $CONF

        fi

        ;;

    stop)

        if [ ! -f $PIDFILE ]

        then

                echo "$PIDFILE does not exist, process is not running"

        else

                PID=$(cat $PIDFILE)

                echo "Stopping ..."

                $CLIEXEC -p $REDISPORT shutdown

                while [ -x /proc/${PID} ]

                do

                    echo "Waiting for Redis to shutdown ..."

                    sleep 1

                done

                echo "Redis stopped"

        fi

        ;;

    *)

        echo "Please use start or stop as first argument"

        ;;

esac

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根据启动脚本,将修改好的配置文件复制到指定目录下,用root用户进行操作:

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mkdir /etc/redis

cp redis.conf /etc/redis/6379.conf

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将启动脚本复制到/etc/init.d目录下,本例将启动脚本命名为redisd(通常都以d结尾表示是后台自启动服务)。

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cp redis_init_script /etc/init.d/redisd

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设置为开机自启动,直接配置开启自启动 chkconfig redisd on 发现错误: service redisd does not support chkconfig

解决办法,在启动脚本开头添加如下注释来修改运行级别:

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#!/bin/sh

# chkconfig:   2345 90 10

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再设置即可

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#设置为开机自启动服务器

chkconfig redisd on

#打开服务

service redisd start

#关闭服务

service redisd stop

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