linux redis 注意事项

1、从节点只做备份，不能读写

 

2、因为不支持代理服务，所以不支持多键操作

 

3、配置项：cluster-require-full-coverage no，这样可以保证当有一个节点失败时，其它节点还能正确工作

 

4、配置项：cluster-node-timeout 5000，不要设得太低，否则会引起从节点“飘移”至其它主节点

 

5、单个键的值数据不应超过1MB（虽然官方说支持最大存储 500MB）

 

6、整个集群只有一个标识为 0 的库，注意命名空间污染问题

 

7、与直接操作本机内存相比，redis 要差好几个数量级

 

8、Redis 功能很强大，但不是万能的！ 

清园

沉没的Atlantis

CentOS7安装配置redis-3.0.0

一.安装必要包

yum install gcc

二.linux下安装

#下载 wget http://download.redis.io/releases/redis-3.0.0.tar.gz
tar zxvf redis-3.0.0.tar.gz
cd redis-3.0.0 #如果不加参数,linux下会报错 make MALLOC=libc

 安装好之后,启动文件

#启动redis src/redis-server & #关闭redis src/redis-cli shutdown

测试redis

$ src/redis-cli 127.0.0.1:6379> set foo bar
OK 127.0.0.1:6379> get foo "bar" $ 

测试成功

 

3.redis cluster集群搭建

建立本机测试环境

建立运行目录

#建立redis运行目录 mkdir -p redis-server/7000/ #复制默认的配置文档 cp redis-3.0.0/redis.conf redis-server/redis.default.conf #把编译好的server复制到运行目录 cp redis-3.0.0/src/redis-server redis-server/7000/

建立独立配置文件

#在7000目录下建立redis的配置文档 vim redis-server/7000/redis.conf

文件内容

#redis-server/7000/redis.conf include /root/redis-server/redis.default.conf
pidfile /var/run/redis-7000.pid
port 7000 cluster-enabled yes
cluster-config-file redis-node-7000.conf
cluster-node-timeout 5000 appendonly yes

复制运行目录(模拟集群环境)

#复制目录 cp -R 7000/ 7001/ cp -R 7000/ 7002/ cp -R 7000/ 7003/ cp -R 7000/ 7004/ cp -R 7000/ 7005/

修改相应配置文件的端口和文件名

建立启动脚本 redis-server/redis-start.sh

#!/bin/sh /root/redis-server/7000/redis-server /root/redis-server/7000/redis.conf &
/root/redis-server/7001/redis-server /root/redis-server/7001/redis.conf &
/root/redis-server/7002/redis-server /root/redis-server/7002/redis.conf &
/root/redis-server/7003/redis-server /root/redis-server/7003/redis.conf &
/root/redis-server/7004/redis-server /root/redis-server/7004/redis.conf &
/root/redis-server/7005/redis-server /root/redis-server/7005/redis.conf &

 

配置集群

安装ruby

yum install ruby-devel.x86_64

安装redis gem 

# gem install redis
Fetching: redis-3.2.1.gem (100%)
Successfully installed redis-3.2.1 Parsing documentation for redis-3.2.1 Installing ri documentation for redis-3.2.11 gem installed

使用脚本建立集群机制  

在create的时候,加上参数--replicas 1 表示为每个master分配一个salve,如例子,则是3个master 3个salve

# ./redis-trib.rb create 127.0.0.1:7000127.0.0.1:7001127.0.0.1:7002127.0.0.1:7003127.0.0.1:7004127.0.0.1:7005 >>> Creating cluster
Connecting to node 127.0.0.1:7000: OK
Connecting to node 127.0.0.1:7001: OK
Connecting to node 127.0.0.1:7002: OK
Connecting to node 127.0.0.1:7003: OK
Connecting to node 127.0.0.1:7004: OK
Connecting to node 127.0.0.1:7005: OK >>> Performing hash slots allocation on 6 nodes...
Using 6 masters: 127.0.0.1:7000127.0.0.1:7001127.0.0.1:7002127.0.0.1:7003127.0.0.1:7004127.0.0.1:7005 M: f3dd250e4bc145c8b9f864e82f65e00d1ba627be 127.0.0.1:7000 slots:0-2730 (2731 slots) master
M: 1ba602ade59e0770a15128b193f2ac29c251ab5e 127.0.0.1:7001 slots:2731-5460 (2730 slots) master
M: 4f840a70520563c8ef0d7d1cc9d5eaff6a1547a2 127.0.0.1:7002 slots:5461-8191 (2731 slots) master
M: 702adc7ae9caf1f6702987604548c6fc1d22e813 127.0.0.1:7003 slots:8192-10922 (2731 slots) master
M: 4f87a11d2ea6ebe9caf02c9dbd827a3dba8a53cf 127.0.0.1:7004 slots:10923-13652 (2730 slots) master
M: 216bbb7da50bd130da16a327c76dc6d285f731b3 127.0.0.1:7005 slots:13653-16383 (2731 slots) master
Can I set the above configuration? (type 'yes' to accept): yes >>> Nodes configuration updated >>> Assign a different config epoch to each node >>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join... >>> Performing Cluster Check (using node 127.0.0.1:7000)
M: f3dd250e4bc145c8b9f864e82f65e00d1ba627be 127.0.0.1:7000 slots:0-2730 (2731 slots) master
M: 1ba602ade59e0770a15128b193f2ac29c251ab5e 127.0.0.1:7001 slots:2731-5460 (2730 slots) master
M: 4f840a70520563c8ef0d7d1cc9d5eaff6a1547a2 127.0.0.1:7002 slots:5461-8191 (2731 slots) master
M: 702adc7ae9caf1f6702987604548c6fc1d22e813 127.0.0.1:7003 slots:8192-10922 (2731 slots) master
M: 4f87a11d2ea6ebe9caf02c9dbd827a3dba8a53cf 127.0.0.1:7004 slots:10923-13652 (2730 slots) master
M: 216bbb7da50bd130da16a327c76dc6d285f731b3 127.0.0.1:7005 slots:13653-16383 (2731 slots) master
[OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage...
[OK] All 16384 slots covered.

 如果需要全部重新自动配置,则删除所有的配置好的cluster-config-file,重新启动所有的redis-server,然后重新执行配置命令即可