Redis是一个开源（BSD许可），内存存储的数据结构服务器，可用作数据库，高速缓存和消息队列代理。

它支持字符串、哈希表、列表、集合、有序集合，位图，hyperloglogs等数据类型。

内置复制、Lua脚本、LRU收回、事务以及不同级别磁盘持久化功能，同时通过Redis Sentinel提供高可用，通过Redis Cluster提供自动分区。

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k-v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主从模式的数据备份。

性能极高——Redis读的速度为11w/s，写的速度为8.1w/s。

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

原子性——Redis的所有操作都是原子性的，同时Redis还支持对几个操作合并后的原子性执行。

丰富的特性——Redis还支持public/subscribe，通知，key过期等特性。

应用在高并发和实时请求的场景，eg新浪微博

hash：关注列表，粉丝列表

string：微博数，粉丝数

（避免使用select count(*) from...）

sorted set：

TopN，热门微博，还有github，stackoverflow

mkdir -p /application/tools

cd /application/tools

wget -q http://download.redis.io/releases/redis-5.0.7.tar.gz

tar xf redis-5.0.7.tar.gz -C /application/

make /application/redis-5.0.7 && make install　

mkdir -p /application/redis6380

cp /application/redis-5.0.7/redis.conf  /application/redis6380/

cp /application/redis-5.0.7/src/redis-server /application/redis6380/

mkdir -p /application/redis6380/logs/

cp /application/redis-5.0.7/src/redis-cli /usr/bin/

cp /application/redis-5.0.7/src/redis-server /usr/bin/

chmod +x /usr/bin/redis-server

chmod +x /usr/bin/redis-cli

bind 127.0.0.1

protected-mode yes

requirepass root

port 6380

tcp-backlog 511

timeout 0

tcp-keepalive 300

daemonize yes

supervised no

pidfile /application/redis6380/redis-6380.pid

loglevel notice

logfile "/application/redis6380/logs/redis.log"

databases 16

always-show-logo yes

save 900 1

save 300 10

save 60 10000

stop-writes-on-bgsave-error yes

rdbcompression yes

rdbchecksum yes

dbfilename dump.rdb

dir ./

replica-serve-stale-data yes

replica-read-only yes

repl-diskless-sync no

repl-diskless-sync-delay 5

repl-disable-tcp-nodelay no

replica-priority 100

lazyfree-lazy-eviction no

lazyfree-lazy-expire no

lazyfree-lazy-server-del no

replica-lazy-flush no

appendonly no

appendfilename "appendonly.aof"

appendfsync everysec

no-appendfsync-on-rewrite no

auto-aof-rewrite-percentage 100

auto-aof-rewrite-min-size 64mb

aof-load-truncated yes

aof-use-rdb-preamble yes

lua-time-limit 5000

slowlog-log-slower-than 10000

slowlog-max-len 128

latency-monitor-threshold 0

notify-keyspace-events ""

hash-max-ziplist-entries 512

hash-max-ziplist-value 64

list-max-ziplist-size -2

list-compress-depth 0

set-max-intset-entries 512

zset-max-ziplist-entries 128

zset-max-ziplist-value 64

hll-sparse-max-bytes 3000

stream-node-max-bytes 4096

stream-node-max-entries 100

activerehashing yes

client-output-buffer-limit normal 0 0 0

client-output-buffer-limit replica 256mb 64mb 60

client-output-buffer-limit pubsub 32mb 8mb 60

hz 10

dynamic-hz yes

aof-rewrite-incremental-fsync yes

rdb-save-incremental-fsync yes

#!/bin/bash

# chkconfig: 2345 80 90

# description: Start and Stop redis

REDISPORT=6380

EXEC=/application/redis6380/redis-server

REDIS_CLI=/usr/bin/redis-cli

PIDFILE=/application/redis6380/redis-6380.pid

CONF="/application/redis6380/redis.conf"

AUTH="root" #如果启用了密码，此处需要添加该项

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

        if [ "$?"="0" ]

        then

              echo "Redis is running..."

        fi

        ;;

    stop)

        if [ ! -f $PIDFILE ]

        then

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

        else

                PID=$(cat $PIDFILE)

                echo "Stopping ..."

                $REDIS_CLI -p $REDISPORT SHUTDOWN

                while [ -x ${PIDFILE} ]

               do

                    echo "Waiting for Redis to shutdown ..."

                    sleep 1

                done

                echo "Redis stopped"

        fi

        ;;

   restart|force-reload)

        ${0} stop

        ${0} start

        ;;

  *)

    echo "Usage: /etc/init.d/redis {start|stop|restart|force-reload}" >&2

        exit 1

esac

[Unit]

Description=Redis persistent key-value database

After=network.target

After=network-online.target

Wants=network-online.target

[Service]

ExecStart=/data/redis6380/redis-server /data/redis6380/redis.conf --supervised systemd

ExecStop=/usr/libexec/redis-shutdown

Type=notify

User=redis

Group=redis

RuntimeDirectory=redis

RuntimeDirectoryMode=0755

[Install]

WantedBy=multi-user.target

systemctl daemon-reload

systemctl enable redis.service

systemctl start redis.service