一、hightlights

1、data type

2、persistence

(1)When snapshot, it will block client request;

(2)“aof” is not used to master-slave synchronization.

二、installation and configuration

1、installation

(1)Decompression redisà” redis-3.2.10.tar.gz”

(2)“tar zxvf redis-3.2.10.tar.gz”

(3)“make”

(4)“make PREFIX=/usr/common/redis/ install”

2、basic commands

(1)“redis-server”àthe daemon boot program of server

(2)“redis-cli”àcommand line operation toolàtelnet

(3)Redis Desktop Manageràgraphical interfaces

(4)“redis-benchmark”àperformance testing tool,test the write and read capacity on your system.

(5)“redis-check-aof”àcheck update log appendonly.aof,

(6)“redis-check-dump”àcheck rdb files in the local dump.

3、configuration

(1)environment variables

1 export JAVA_HOME=/usr/local/java/jdk1.8.0_261
2 export CLASSPATH=.:$JAVA_HOME/lib.tool.jar:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar
 
3 export NODE_HOME=/usr/local/node
4 export REDIS_HOME=/usr/local/redis
5 export PATH=$JAVA_HOME/bin:$NODE_HOME/bin:$REDIS_HOME/bin:$PATH

(2)” cp redis.conf /usr/local/redis/conf/”

(3)start-->"redis-server /usr/common/redis/conf/redis.conf &"

(4)remote login:

(4.1)bind ip address

(4.2)protected mode no

(5)client login-->"redis-cli –h ip –p port -a"

(6)setup auto start

(6.1)startup script(utils/redis_init_script)

 1 #!/bin/sh
 2 # chkconfig: 2345 90 10
 3 # Simple Redis init.d script conceived to work on Linux systems
 4 # as it does use of the /proc filesystem.
 5  
 6 #redis伺服器監聽的埠
 7 REDISPORT=6379
 8  
 9 #服務端所處位置
10 EXEC=/usr/local/bin/redis-server
11  
12 #客戶端位置
13 CLIEXEC=/usr/local/bin/redis-cli
14  
15 #redis的PID檔案位置，需要修改
16 PIDFILE=/var/run/redis_${REDISPORT}.pid
17  
18 #redis的配置檔案位置，需將${REDISPORT}修改為檔名
19 CONF="/etc/redis/${REDISPORT}.conf"
20  
21 case "$1" in
22     start)
23         if [ -f $PIDFILE ]
24         then
25                 echo "$PIDFILE exists, process is already running or crashed"
26         else
27                 echo "Starting Redis server..."
28                 $EXEC $CONF
29         fi
30         ;;
31     stop)
32         if [ ! -f $PIDFILE ]
33         then
34                 echo "$PIDFILE does not exist, process is not running"
35         else
36                 PID=$(cat $PIDFILE)
37                 echo "Stopping ..."
38                 $CLIEXEC -p $REDISPORT shutdown
39                 while [ -x /proc/${PID} ]
40                 do
41                     echo "Waiting for Redis to shutdown ..."
42                     sleep 1
43                 done
44                 echo "Redis stopped"
45         fi
46         ;;
47     *)
48         echo "Please use start or stop as first argument"
49         ;;
50 esac

(6.2)setup

 1 mkdir /etc/redis
 2 cp redis.conf /etc/redis/6379.conf
 3 # 將啟動指令碼複製到/etc/init.d目錄下，本例將啟動指令碼命名為redisd（通常都以d結尾表示是# 後臺自啟動服務）
 4 cp redis_init_script /etc/init.d/redisd
 5 # 設定為開機自啟動伺服器
 6 chkconfig redisd on
 7 # 開啟服務
 8 service redisd start
 9 # 關閉服務
10 service redisd stop

4、warning

(1)“WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.”

1 “vim /etc/sysctl.conf”
2 “net.core.somaxconn= 1024”
3 “sysctl -p”

(2)” WARNING overcommit_memory is set to 0! Background save may fail under low memory condition.”

1 “vim /etc/sysctl.conf”prevent save failure because memory is not enough
2 “vm.overcommit_memory=1”
3 “sysctl –p”

三、operations

1、basic operation

1 “set key value”
2 “get key”
3 “del key”
4 “nil”-->NULL
5 “exists key”
6 “keys *”-->get all

2、dump

1 There are 16 default databases in the redis
2 Identifier-->0-15
3 “select id”-->switch between dumps

3、telnet

1 “telnet ip port”
2 “set key value”
3 “get key”