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Redis.3.0.5集群安装详解

2015-11-29 12:01 681 查看
之前写过一个redis的入门教程, 这次来用redis进行集群的安装配置。

Redis集群介绍

Redis 集群是一个提供在多个Redis间节点间共享数据的程序集.

Redis集群并不支持处理多个keys的命令,因为这需要在不同的节点间移动数据,从而达不到像Redis那样的性能,在高负载的情况下可能会导致不可预料的错误.

Redis 集群通过分区来提供一定程度的可用性,在实际环境中当某个节点宕机或者不可达的情况下继续处理命令.

Redis 集群的优势:

-自动分割数据到不同的节点上.

整个集群的部分节点失败或者不可达的情况下能够继续处理命令.

准备工作

我的环境:centos6.5,redis版本:3.0.5

事先下载好redis-3.0.5

要让集群正常工作至少需要3个主节点,在这里我们要创建6个redis节点,其中三个为主节点,三个为从节点,对应的redis节点的ip和端口对应关系如下

127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
127.0.0.1:7003
127.0.0.1:7004
127.0.0.1:7005


解压,编译

解压到/opt/redis-3.0.5/ 目录以后称为主目录

解压后主要有几个目录(deps,src,tests,utils)和一些构建文件

编译

cd /opt/redis-3.0.5/

make

make install

在主目录下创建bin目录和etc目录,

在/opt/redis-3.0.5/src/拷贝可执行文件(redis-benchmark,redis-check-aof,redis-check-dump,redis-cli,redis-sentinel,redis-server,redis-trib.rb)到/opt/redis-3.0.5/bin目录

拷贝额配置文件redis.conf到etc目录

集群环境准备

在主目录中创建津群所需要目录

mkdir -p /opt/redis-3.0.5/cluster
cd /opt/redis-3.0.5/cluster
mkdir 7000
mkdir 7001
mkdir 7002
mkdir 7003
mkdir 7004
mkdir 7005


修改配置文件redis.conf

vi redis.conf
##修改配置文件中的下面选项
port 7000
daemonize yes
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes


修改完redis.conf配置文件中的这些配置项之后,把这个配置文件分别拷贝到7000/ 7001/ 7002/ 7003/ 7004/ 7005/ 目录下面,并且端口更改为对应文件夹的名称

启动集群

分別進入7000 到7005 6个目录,运行如下命令

./redis-server redis.conf


运行完毕后,运行ps -ef|grep redis,查看下如下进程即为正常:

[root@zt 7005]# ps -ef|grep redis
root     28198     1  0 22:24 ?        00:00:00 ./redis-server *:7000 [cluster]
root     28207     1  0 22:24 ?        00:00:00 ./redis-server *:7001 [cluster]
root     28212     1  0 22:24 ?        00:00:00 ./redis-server *:7002 [cluster]
root     28217     1  0 22:24 ?        00:00:00 ./redis-server *:7003 [cluster]
root     28221     1  0 22:24 ?        00:00:00 ./redis-server *:7004 [cluster]
root     28227     1  0 22:24 ?        00:00:00 ./redis-server *:7005 [cluster]
root     28236 21341  0 22:25 pts/1    00:00:00 grep redis


在目录中运行redis的创建集群命令,以创建集群

cd /opt/redis-3.0.5/bin/
./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005


运行过程中会提示需要ruby环境,因为redis-trib.rb 是个ruby脚本

安装ruby相关依赖:

yum install ruby # ruby运行时环境
yum install rubygems #用来安装ruby代码些的相关软件包
gem install redis #因为ruby脚本redis-trib.rb 要调用redis接口,所以需要ruby的redis接口


重新执行之前创建集群命令:

[root@zhangtao bin]# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
>>> 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 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7003 to 127.0.0.1:7000
Adding replica 127.0.0.1:7004 to 127.0.0.1:7001
Adding replica 127.0.0.1:7005 to 127.0.0.1:7002
M: 3bdc356afba36daeb605eed62d94e3fef93e83ac 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: 761d8891d8f21d3a43741466bcaac9339ac5ad8b 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: ae7c6ac13cec007a999a1a71f3c78a69688d26b5 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
S: ce0746ff514a1a738a7c901e193433cce23d28fe 127.0.0.1:7003
replicates 3bdc356afba36daeb605eed62d94e3fef93e83ac
S: bb0a142e2429035e118f0bb078d5ee2f94e83227 127.0.0.1:7004
replicates 761d8891d8f21d3a43741466bcaac9339ac5ad8b
S: 4eb893c9b052e10e728e18889c16ef6e573a7fe9 127.0.0.1:7005
replicates ae7c6ac13cec007a999a1a71f3c78a69688d26b5
Can I set the above configuration? (type 'yes' to accept):  #这里输入yes摁回车

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: 3bdc356afba36daeb605eed62d94e3fef93e83ac 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: 761d8891d8f21d3a43741466bcaac9339ac5ad8b 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: ae7c6ac13cec007a999a1a71f3c78a69688d26b5 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
M: ce0746ff514a1a738a7c901e193433cce23d28fe 127.0.0.1:7003
slots: (0 slots) master
replicates 3bdc356afba36daeb605eed62d94e3fef93e83ac
M: bb0a142e2429035e118f0bb078d5ee2f94e83227 127.0.0.1:7004
slots: (0 slots) master
replicates 761d8891d8f21d3a43741466bcaac9339ac5ad8b
M: 4eb893c9b052e10e728e18889c16ef6e573a7fe9 127.0.0.1:7005
slots: (0 slots) master
replicates ae7c6ac13cec007a999a1a71f3c78a69688d26b5
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.


测试集群环境安装配置成功

测试集群环境

使用./redis-cli -c -p 7000 命令连接集群环境:

[root@zhangtao bin]# cd /opt/redis-3.0.5/bin/
[root@zhangtao bin]# ./redis-cli -c -p 7000
127.0.0.1:7000> set foo bar
-> Redirected to slot [12182] located at 127.0.0.1:7002
OK
127.0.0.1:7002> set hello world
-> Redirected to slot [866] located at 127.0.0.1:7000
OK
127.0.0.1:7000> get hello
"world"
127.0.0.1:7000> get foo
-> Redirected to slot [12182] located at 127.0.0.1:7002
"bar"
127.0.0.1:7002>
127.0.0.1:7002> quit


redis对集群的支持是非常基本的, 所以它总是依靠 Redis 集群节点来将它转向(redirect)至正确的节点。

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参考资料

http://www.th7.cn/Program/Ruby/201501/365797.shtml

http://www.redis.cn/topics/cluster-tutorial.html
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