codis实现redis分片和在线扩展

Codis是一个开源的分布式redis解决方案，由以下四个组件组成：codis-proxy:后端redis的代理，本事实现了redis协议。codis-config:是codis的管理配置工具，用于..

Codis是一个开源的分布式redis解决方案，由以下四个组件组成：

codis-proxy:后端redis的代理，本事实现了redis协议。

codis-config:是codis的管理配置工具，用于增删redis server、操作数据迁移。

zookeeper:用来存放数据路由表和codis-proxy节点的元信息,codis-config发起的命令都会通过 zookeeper同步到各个存活的codis-proxy。

codis-server:codis项目维护的一个 redis 分支, 基于 2.8.13 开发, 加入了 slot 的支持和原子的数据迁移指令，如果要使用codis的在线扩展迁移功能的话必须使用codis自带的codis-server，codis不支持对原生redis做在线的扩展和数据迁移。

节点规划：

codis-proxy
192.168.0.100:19000

codis-config
192.168.0.100

codis-server1
192.168.0.100:6381

codis-server2192.168.0.100:6382

codis-server3192.168.0.100:6380

codis-server4192.168.0.100:6383

1、安装配置

a、首先安装golang

## 解压下载好的go软件包$ tar xf/opt/go1.4.2.linux-amd64.tar.gz -C/usr/local/## 配置环境变量在.bash_profile中加入go的相关环境变量，并使新的环境变量生效PATH=$PATH:$HOME/binexportGOROOT=/usr/local/goexportGOOS=linuxexportGOARCH=amd64exportGOBIN=$GOROOT/binexportGOPATH=/opt/mygoPATH=$PATH:$GOBINexport PATH##编写一个 测试程序验证go是否安装成功$ cat hello.gopackage mainimport”fmt”func main() { fmt.Printf(“hello, world\n”)}## 运行测试程序，输出hello,word说明go已经安装成功$ go run hello.gohello, world

b、安装codis

## 安装工具软件$ yum install gccmake git -y ## 下载codis,会下载到环境变量GOPATH指定的目录$ go get github.com/wandoulabs/codis#ssdb-server configpackagegithub.com/wandoulabs/codis imports github.com/wandoulabs/codis imports github.com/wandoulabs/codis: nobuildable Go source files in /opt/mygo/src/github.com/wandoulabs/codis## 下载完成后进入/opt/mygo/src/github.com/wandoulabs/codis$ cd /opt/mygo/src/github.com/wandoulabs/codis## 执行安装命令$ ./bootstrap.sh## 这一步时间稍久，会下载一些文件目录到本地，耐心等待即可

c、安装zookeeper

##　解压zookeeper$ tar xfzookeeper-3.4.6.tar.gz -C /opt/##　进入zk的安装目录，修改配置文件$ cd /opt/zookeeper-3.4.6$ cp conf/zoo_sample.cfgconf/zoo.cfg$ vim conf/zoo.cfgtickTime=2000initLimit=10syncLimit=5dataDir=/data/zookeeperdataLogDir=/opt/zookeeper-3.4.6/logsclientPort=2181## 创建所需要的目录mkdir /data/zookeeper -pmkdir /opt/zookeeper-3.4.6/logs## 启动zk$ /opt/zookeeper-3.4.6/bin/zkServer.sh start JMX enabled bydefaultUsing config:/opt/zookeeper-3.4.6/bin/../conf/zoo.cfgStarting zookeeper… STARTED ## 验证是否启动成功,若2181端口被监听，则表示成功$ netstat-alnut|grep 2181tcp 0 0 :::2181 :::* LISTEN

d、配置codis

## codis中配置zk的信息$ cd /opt/mygo/src/github.com/wandoulabs/codis/sample/## 修改config.ini$ vim config.inizk=localhost:2181product=codis_proxyproxy_id=proxy_1net_timeout=5dashboard_addr=localhost:18087coordinator=zookeeper

2、启动codis

a、

## 进入相关目录$ cd /opt/mygo/src/github.com/wandoulabs/codis/sample/## 启动dashboard./start_dashboard.sh## 验证是否成功$ netstat -alnut|grep 18087tcp 0 0 :::18087 :::* LISTE

：

b、初始化slots

##进入相关目录$ cd /opt/mygo/src/github.com/wandoulabs/codis/sample/## 执行初始化$ ../bin/codis-config slot init{ “msg”: “OK”, “ret”: 0}

c、启动codis-server

## codis自带有一个启动脚本，会启动两个codis-server，监听端口为6381和6382[root@mgs02 sample]#./start_redis.sh sleep 3s[6294] 09 Apr 14:28:02.796* Increased maximum number of open files to 10032 (it was originally set to1024). _._ _.-“__ ”-._ _.-“ `. `_. 本文来源gaodai#ma#com搞@@代~&码*网/”-._ Redis 2.8.13 (1e823fd3/1) 64 bit .-“ .-“`. “`\/ _.,_ ”-._ ( ‘ , .-` | `, ) Running in stand alone mode |`-._`-…-` __…-.“-._|’` _.-‘| Port: 6381 | `-._ `._ / _.-‘ | PID: 6294 `-._ `-._ `-./ _.-‘ _.-‘ |`-._`-._ `-.__.-‘ _.-‘_.-‘| | `-._`-._ _.-‘_.-‘ | `-._ `-._`-.__.-‘_.-‘ _.-‘ |`-._`-._ `-.__.-‘ _.-‘_.-‘| | `-._`-._ _.-‘_.-‘ | `-._ `-._`-.__.-‘_.-‘ _.-‘ `-._ `-.__.-‘ _.-‘ `-._ _.-‘ `-.__.-‘ [6294] 09 Apr14:28:02.814 # Server started, Redis version 2.8.13[6294] 09 Apr14:28:02.814 # WARNING overcommit_memory is set to 0! Background save may failunder low memory condition. To fix this issue add ‘vm.overcommit_memory = 1’ to/etc/sysctl.conf and then reboot or run the command ‘sysctlvm.overcommit_memory=1’ for this to take effect.[6294] 09 Apr14:28:02.814 * The server is now ready to accept connections on port 6381[6295] 09 Apr14:28:02.795 * Increased maximum number of open files to 10032 (it wasoriginally set to 1024). _._ _.-“__ ”-._ _.-“ `. `_. ”-._ Redis 2.8.13 (1e823fd3/1) 64 bit .-“ .-“`. “`\/ _.,_ ”-._ ( ‘ , .-` | `, ) Running in stand alone mode |`-._`-…-` __…-.“-._|’` _.-‘| Port: 6382 | `-._ `._ / _.-‘ | PID: 6295 `-._ `-._ `-./ _.-‘ _.-‘ |`-._`-._ `-.__.-‘ _.-‘_.-‘| | `-._`-._ _.-‘_.-‘ | `-._ `-._`-.__.-‘_.-‘ _.-‘ |`-._`-._ `-.__.-‘ _.-‘_.-‘| | `-._`-._ _.-‘_.-‘ | `-._ `-._`-.__.-‘_.-‘ _.-‘ `-._ `-.__.-‘ _.-‘ `-._ _.-‘ `-.__.-‘ [6295] 09 Apr14:28:02.811 # Server started, Redis version 2.8.13[6295] 09 Apr14:28:02.811 # WARNING overcommit_memory is set to 0! Background save may failunder low memory condition. To fix this issue add ‘vm.overcommit_memory = 1’ to/etc/sysctl.conf and then reboot or run the command ‘sysctlvm.overcommit_memory=1’ for this to take effect.[6295] 09 Apr 14:28:02.812 * The server is nowready to accept connections on port 6382

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