序号服务IP说明
1192.168.1.110Redis节点A端⼝：7000(M)，7003(S)
Redis节点B端⼝：7001(M)，7004(S)
Redis节点C端⼝：7002(M)，7005(S)
Net分布式系统之五：C#使⽤Redis集缓存
本⽂介绍系统缓存组件，采⽤NOSQL之Redis作为系统缓存层。
⼀、背景
  系统考虑到⾼并发的使⽤场景。对于并发提交场景，通过上⼀章节介绍的RabbitMQ组件解决。对于系统⾼并发查询，为了提供性能减少数据库压⼒，我们加⼊缓存机制，可以不同层次加⼊缓存⽀持，本⽂主要介绍应⽤服务层和数据层之间加⼊缓存机制提升性能。业界缓存组件有Redis、Memcached、MemoryCache。本系统采⽤Redis缓存组件，有些系统将Redis当作MQ使⽤，此场景本系统⽤RabbitMQ，Redis主要⽤于系统缓存应⽤。
⼆、Redis简介
  Redis是⼀个开源的Key-Value数据库，使⽤C语⾔编写、⽀持⽹络、可基于内存亦可持久化的NOSQL数据库，并提供多种语⾔的API，例如：Java，C/C++，C#，PHP，JavaScript，Perl，Object-C，Python，Ruby等语⾔驱动。⾃Redis3.0开始⽀持集⽅案。
  相关Redis Cluster 原理在此不多介绍，⽹络上有很多资料。
三、Redis集应⽤
  （⼀）环境介绍
centos vim命令    本系统基于Linux之CentOS搭建Redis3.0集。将三个Instance部署于⼀台虚拟机，应⽤部署于windows平台。
  （⼆）安装Redis
  1、安装相关依赖⼯具
1[root@andoncentos 桌⾯]# yum -y install gcc openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel gcc-c++ automake autoconf  　2、安装Redis 3.0.6
1[root@andoncentos 桌⾯]# cd /usr/loacal
1[root@andoncentos loacal]# wget dis.io/releases/redis-3.0.
1[root@andoncentos 桌⾯]# tar xvf redis-3.0.
1[root@andoncentos 桌⾯]# cd redis-3.0.6/
1[root@andoncentos 桌⾯]# make MALLOC=libc
1[root@andoncentos redis-3.0.6]# make install
  3、由于我们使⽤不同端⼝号区分，在两个服务各⾃建⽴以端⼝命名的⽂件夹。配置7000节点服务，将redis-server和f复制
到/etc/redis/7000
1[root@andoncentos 桌⾯]# mkdir /etc/redis/7000
1[root@andoncentos 桌⾯]# mkdir /etc/redis/7001
1[root@andoncentos 桌⾯]# mkdir /etc/redis/7002
1[root@andoncentos 桌⾯]# mkdir /etc/redis/7003
1[root@andoncentos 桌⾯]# mkdir /etc/redis/7004
1[root@andoncentos 桌⾯]# mkdir /etc/redis/7005
1[root@andoncentos redis-3.0.6]# cp /usr/local/redis-3.0.6/src/redis-server /usr/local/redis-3.0.f /etc/redis/7000
1[root@andoncentos redis-3.0.6]# vim /etc/redis/f
  port 7000
  daemonize yes
  pidfile /var/run/redis_7000.pid
  cluster-enabled yes
  f
  logfile "/var/log/redisd7000.log"
  dir /etc/redis/7000/
  cluster-node-timeout 5000
  appendonly yes
  4、修改redis服务的启动脚本，修改内容，并复制相关其他的节点配置
1 2[root@andoncentos redis-3.0.6]# cp /usr/local/redis-3.0.6/utils/redis_init_script /etc/init.d/redis7000 [root@andoncentos redis-3.0.6]# vim /etc/init.d/redis7000
#!/bin/sh
# chkconfig 2345 90 10
# description:Redis is a persistent key-value database
# Simple Redis init.d script conceived to work on Linux systems # as it does use of the /proc filesystem.
REDISPORT=7000
# EXEC=/usr/local/bin/redis-server
EXEC=/etc/redis/${REDISPORT}/redis-server
CLIEXEC=/usr/local/bin/redis-cli
PIDFILE=/var/run/redis_${REDISPORT}.pid
CONF="/etc/redis/${REDISPORT}/f"
1 2 3[root@andoncentos redis-3.0.6]# cp /etc/init.d/redis7000 /etc/init.d/redis7001 [root@andoncentos redis-3.0.6]# cp /etc/init.d/redis7000 /etc/init.d/redis7003 [root@andoncentos redis-3.0.6]# cp /etc/init.d/redis7000 /etc/init.d/redis7004
  5、设置为开机⾃启动服务器
1 2 3 4[root@andoncentos redis-3.0.6]# chkconfig redis7000 on [root@andoncentos redis-3.0.6]# chkconfig redis7001 on [root@andoncentos redis-3.0.6]# chkconfig redis7003 on [root@andoncentos redis-3.0.6]# chkconfig redis7004 on
  6、重启系统，并检查redis7000,redis7001,redis7003,redis7004服务情况
1[root@andoncentos redis-3.0.6]# reboot<br>[root@andoncentos 桌⾯]# systemctl status redis7004.service
  （三）配置Redis集
  1、按照 ruby tree ⼯具，因为redis集需要ruby
1[root@andoncentos redis-3.0.6]# yum -y install tcl ruby tree<br>[root@andoncentos 桌⾯]# gem install redis --version 3.0.6 Fetching: redis-3. (100%)
Successfully installed redis-3.0.6
Parsing documentation for redis-3.0.6
Installing ri documentation for redis-3.0.6
1 gem installed
  2、redis-trib.rb 配置集
1
2
3
4 5 6 7 8 9 10 11 12 13 14 15 16 17[root@andoncentos 桌⾯]# /usr/local/redis-3.0.6/src/redis-trib.rb create --replicas 1 192.168.1.110:7000 192.168.1.110:7001 192.168.1.110:7002 192.168.1.110:7003 192.168.1.110:7004 192.168.1.110:7005
>>> Creating cluster
>>> Performing hash slots allocation
Using 3 masters:
192.168.1.110:7000
192.168.1.110:7001
192.168.1.110:7002
Adding replica 192.168.1.110:7003 to 192.168.1.110:7000
Adding replica 192.168.1.110:7004 to 192.168.1.110:7001
Adding replica 192.168.1.110:7005 to 192.168.1.110:7002
M: b164701893bfbdc078e2f7e3b16f1216c1bf65ff 192.168.1.110:7000
slots:0-5460 (5461 slots) master
M: 4c2d36c55cff692a7bbeccb663197b555747d15d 192.168.1.110:7001
slots:5461-10922 (5462 slots) master
M: b147e4dfcd63c5ce059540db55a9d7cb9fa093eb 192.168.1.110:7002
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47  slots:10923-16383 (5461 slots) master
S: 757381aa5cc5c8ba70f3798f6de6cb7b2e97f924 192.168.1.110:7003
replicates b164701893bfbdc078e2f7e3b16f1216c1bf65ff
S: fecc8edf32fc72cd4a5d8ae5306fe4083abfe8e9 192.168.1.110:7004
replicates 4c2d36c55cff692a7bbeccb663197b555747d15d
S: 98bd8e1aff631a3bee7f92a39764decea16ee955 192.168.1.110:7005
replicates b147e4dfcd63c5ce059540db55a9d7cb9fa093eb
Can I set the above configuration? (type 'yes'to accept): <strong>yes</strong>          >>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster
>>> Performing Cluster Check (using node 192.168.1.110:7000)
M: b164701893bfbdc078e2f7e3b16f1216c1bf65ff 192.168.1.110:7000
slots:0-5460 (5461 slots) master
M: 4c2d36c55cff692a7bbeccb663197b555747d15d 192.168.1.110:7001
slots:5461-10922 (5462 slots) master
M: b147e4dfcd63c5ce059540db55a9d7cb9fa093eb 192.168.1.110:7002
slots:10923-16383 (5461 slots) master
M: 757381aa5cc5c8ba70f3798f6de6cb7b2e97f924 192.168.1.110:7003
slots: (0 slots) master
replicates b164701893bfbdc078e2f7e3b16f1216c1bf65ff
M: fecc8edf32fc72cd4a5d8ae5306fe4083abfe8e9 192.168.1.110:7004
slots: (0 slots) master
replicates 4c2d36c55cff692a7bbeccb663197b555747d15d
M: 98bd8e1aff631a3bee7f92a39764decea16ee955 192.168.1.110:7005
slots: (0 slots) master
replicates b147e4dfcd63c5ce059540db55a9d7cb9fa093eb
[OK] All nodes agree about slots configuration.
>>> Check for
>>> Check
[OK] All 16384 slots covered.
  3、检查集状态
1[root@andoncentos 桌⾯]# /usr/local/redis-3.0.6/src/redis-trib.rb check  192.168.1.110:7000  4、若出错的话，通过如下命令⾏修复
1[root@andoncentos 桌⾯]# /usr/local/redis-3.0.6/src/redis-trib.rb fix 192.168.1.110:7000
  5、防⽕墙开放端⼝，并重启防⽕墙
1 2 3 4[root@andoncentos 桌⾯]# firewall-cmd --zone=public--add-port=7000-7005/tcp --permanent success
[root@andoncentos 桌⾯]# firewall-cmd --reload
success
  6、检查集情况1
2 3 4 5 6 7 8 9 10 11 12 13[root@andoncentos 桌⾯]# redis-cli -c -p 7000 127.0.0.1:7000> cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_sent:2492
cluster_stats_messages_received:2492
四、使⽤说明
  （⼀）使⽤命令⾏测试缓存 
  （⼆）通过C#代码测试缓存
  1、通过使⽤dis组件，将数据缓存到集redis服务。
1 2 3 4 5 6 7var cfg = RedisCachingSectionHandler.GetConfig();
var serializer = new NewtonsoftSerializer();
var redis = new StackExchangeRedisCacheClient(serializer, cfg);
var cls = new Cls(){ ID = 1, Name = txt };
string key = "tkey"+ new Random().Next(1000, 9999).ToString(); redis.Add<Cls>(key, cls);
  2、通过key获取数据
1 2 3 4 5var cfg = RedisCachingSectionHandler.GetConfig();
var serializer = new NewtonsoftSerializer();
var redis = new StackExchangeRedisCacheClient(serializer, cfg); var entity =  redis.Get<Cls>(key);
ViewBag.KV = entity != null? entity.Name : "";
  3、redis缓存情况
五、总结
  redis cluster 默认⽀持HA，但是对于单个Instance故障，使⽤者需要⾃⾏判断处理的机制，后续有待于研究，但是redis codis 这⽅⾯提供了⽅便的⽀持。

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