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HomeDatabaseMysql Tutorial codis集群部署实战

一、概要1、折腾codis集群已经快两个月了,感谢一直以来codis的作者刘奇和黄东旭的耐心支持,在这里给你们点个赞,现在我司已经有一个业务跑在了codis集群上,目

一、概要

1、折腾codis集群已经快两个月了,感谢一直以来codis的作者刘奇和黄东旭的耐心支持,在这里给你们点个赞,现在我司已经有一个业务跑在了codis集群上,目前只是切了整个业务的10%的量,预计下周会全量切到codis上,这个时候大家肯定特别想知道codis稳定吗?有没有什么bug啊,你想知道的也是我想知道的,搞起吧,用了才知道,反正目前我们这没发现啥问题,一些小的问题已经及时联系作者改掉了,好吧,不扯淡了,写这篇文章的目的是帮助想了解codis的初学者快速部署(官方的部署文档对应运维知识弱一点的童鞋看来还是有点费力)还有就是给自己做一个备录以便后期集群的部署。

2、Codis 是一个分布式 Redis 解决方案, 对于上层的应用来说, 连接到 Codis Proxy 和连接原生的 Redis Server 没有明显的区别 (有一些命令不支持), 上层应用可以像使用单机的 Redis 一样使用, Codis 底层会处理请求的转发, 不停机的数据迁移等工作, 所有后边的一切事情, 对于前面的客户端来说是透明的, 可以简单的认为后边连接的是一个内存无限大的 Redis 服务,,当然,前段时间redis官方的3.0出了稳定版,3.0支持集群功能,codis的实现原理和3.0的集群功能差不多,我了解的现在美团、阿里已经用了3.0的集群功能了,我们这边的业务主要是php,3.0集群的sdk目前貌似还没有支持php语言的,大家谁的php应用上了3.0集群,请联系我,我去取经,有关redis常见的集群技术,请移步到 @萧田国 萧老师的infoq专栏Redis集群技术及Codis实践

二、架构

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三、角色分批

zookeeper集群: 10.10.0.47 10.10.0.48 10.10.1.76 codis-config、codis-ha: 10.10.32.10:18087 codis-proxy: 10.10.32.10:19000 10.10.32.49:19000 codis-server: 10.10.32.42:6379、10.10.32.43:6380(主、从) 10.10.32.43:6379、10.10.32.44:6380(主、从) 10.10.32.44:6379、10.10.32.42:6380(主、从)

四、部署

1、安装zookeeper

yum -y install zookeeper jdk  ##安装服务vim /etc/hosts  ##添加host 10.10.0.47 ZooKeeper-node1 10.10.0.48 ZooKeeper-node2 10.10.1.76 ZooKeeper-node3vim /etc/zookeeper/conf/zoo.cfg ##撰写zk的配置文件 maxClientCnxns=50 tickTime=2000 initLimit=10 syncLimit=5 dataDir=/data/zookeeper/ clientPort=2181 server.1=ZooKeeper-node1:2888:3888 server.2=ZooKeeper-node2:2888:3888 server.3=ZooKeeper-node3:2888:3888mkdir /data/zookeeper/ ##创建zk的datadir目录 echo "2" >/data/zookeeper/myid  ##生成ID,这里需要注意, myid对应的zoo.cfg的server.ID,比如ZooKeeper-node2对应的myid应该是2 /usr/lib/zookeeper/bin/zkServer.sh start  ## 服务启动

2、go安装(codis是go语言写的,所以那些机器需要安装你懂得)

wget https://storage.googleapis.com/golang/go1.4.1.linux-amd64.tar.gz tar -zxvf go1.4.1.linux-amd64.tar.gz mv go /usr/local/ cd /usr/local/go/src/ bash all.bash cat >> ~/.bashrc 3、下载并编译codis(codis-config、codis-proxy、codis-server所在的机器)mkdir /data/go export GOPATH=/data/go /usr/local/go/bin/go get github.com/wandoulabs/codis cd  /data/go/src/github.com/wandoulabs/codis/ ./bootstrap.sh make gotest

五、服务启动及初始化集群

1、启动 dashboard(codis-config上操作)

cat /etc/codis/config_10.ini ##撰写配置文件 zk=10.10.0.47:2181,10.10.0.48:2181,10.10.1.76:2181 product=zh_news proxy_id=codis-proxy_10 net_timeout=5000 proto=tcp4 dashboard_addr=10.10.32.10:18087cd /data/go/src/github.com/wandoulabs/codis/ &&  ./bin/codis-config -c /etc/codis/config_10.ini  dashboard &cd /data/go/src/github.com/wandoulabs/codis/ ./bin/codis-config -c /etc/codis/config_10.ini server add 1 10.10.32.42:6379 master ./bin/codis-config -c /etc/codis/config_10.ini server add 1 10.10.32.43:6380 slave ./bin/codis-config -c /etc/codis/config_10.ini server add 2 10.10.32.43:6379 master ./bin/codis-config -c /etc/codis/config_10.ini server add 2 10.10.32.44:6380 slave ./bin/codis-config -c /etc/codis/config_10.ini server add 3 10.10.32.44:6379 master ./bin/codis-config -c /etc/codis/config_10.ini server add 3 10.10.32.42:6380 slave

5、设置 server group 服务的 slot 范围 Codis 采用 Pre-sharding 的技术来实现数据的分片, 默认分成 1024 个 slots (0-1023), 对于每个key来说, 通过以下公式确定所属的 Slot Id : SlotId = crc32(key) % 1024 每一个 slot 都会有一个特定的 server group id 来表示这个 slot 的数据由哪个 server group 来提供.(codis-config上操作)

cd /data/go/src/github.com/wandoulabs/codis/ ./bin/codis-config -c /etc/codis/config_10.ini slot range-set 0 300 1 online ./bin/codis-config -c /etc/codis/config_10.ini slot range-set 301 700 2 online ./bin/codis-config -c /etc/codis/config_10.ini slot range-set 701 1023 3 online
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