Redis 3.0.2集群搭建以及相关问题汇总

Redis3 正式支持了 cluster，是为了解决构建redis集群时的诸多不便

（1）像操作单个redis一样操作key，不用操心key在哪个节点上
（2）在线动态添加、删除redis节点，不用停止服务
（3）根据节点性能，动态分配不同数量的key到不同redis节点

（4）每个节点都配有slave，并自动监测和切换

Redis3 cluster 中增加了一个重要概念：

hash slot（哈希槽），共有16384个slot
key不是直接放入redis中了，而是放入slot中，再把slot放入redis中

根据key的hash值计算其所在的slot，再根据slot和redis节点的对应关系，找到此slot所在的节点，然后到这个节点对key进行操作

例如现有3个redis节点，每个节点各负责一半数量的slot，16384/3 = 5461个
现在想添加一个redis节点，可以从节点1、节点2、节点3 中各拿出一部分的slot，移到新节点
每个redis节点中的slot数量可以不一致，根据节点性能适当分配

进入集群需要用redis -c -p 7000 -c是enable cluster p指定进入端口

搭建集群遇到的问题：

由于教程里面给出的集群的地址是127.0.0.1:7000、......，在java程序访问的时候是无法获取节点信息的，所以我需要重新搭建集群，然后停掉所有节点，重新搭建的时候，报出了如下错误，可知是因为有些配置文件以及数据没有删除。将其全部删除干净即可。

[ERR] Node 172.168.63.202:7001 is not empty.

Either the nodealready knows other nodes (check with CLUSTER NODES) or contains some key in database 0.

find / -name dump.rdb

rm -f /usr/redis/cluster/7002/redis7002/src/dump.rdb

rm -f /usr/redis/cluster/7004/redis7004/src/dump.rdb

rm -f /usr/redis/cluster/7005/redis7005/src/dump.rdb

rm -f /usr/redis/cluster/7001/redis7001/src/dump.rdb

rm -f /usr/redis/cluster/7000/redis7000/src/dump.rdb

rm -f /usr/redis/cluster/7003/redis7003/src/dump.rdb

rm -f /usr/redis/master/redis-3.0.7/src/dump.rdb

find / -name dump.rdb

find / -name appendonly.aof

rm -f /usr/redis/cluster/7002/redis7002/src/appendonly.aof

rm -f /usr/redis/cluster/7004/redis7004/src/appendonly.aof

rm -f /usr/redis/cluster/7005/redis7005/src/appendonly.aof

rm -f /usr/redis/cluster/7001/redis7001/src/appendonly.aof

rm -f /usr/redis/cluster/7000/redis7000/src/appendonly.aof

rm -f /usr/redis/cluster/7003/redis7003/src/appendonly.aof

find / -name appendonly.aof

find / -name nodes.conf

rm -f /usr/redis/cluster/7002/redis7002/src/nodes.conf

rm -f /usr/redis/cluster/7004/redis7004/src/nodes.conf

rm -f /usr/redis/cluster/7005/redis7005/src/nodes.conf

rm -f /usr/redis/cluster/7001/redis7001/src/nodes.conf

rm -f /usr/redis/cluster/7000/redis7000/src/nodes.conf

rm -f /usr/redis/cluster/7003/redis7003/src/nodes.conf

find / -name nodes.conf

#创建集群

#!/bin/sh

cd /usr/redis/cluster/7000/redis7000/src/

./redis-server ../redis.conf

cd /usr/redis/cluster/7001/redis7001/src/

./redis-server ../redis.conf

cd /usr/redis/cluster/7002/redis7002/src/

./redis-server ../redis.conf

cd /usr/redis/cluster/7003/redis7003/src/

./redis-server ../redis.conf

cd /usr/redis/cluster/7004/redis7004/src/

./redis-server ../redis.conf

cd /usr/redis/cluster/7005/redis7005/src/

./redis-server ../redis.conf

cd /usr/redis/cluster/7000/redis7000/src/

./redis-trib.rb create --replicas 1 192.168.10.102:7000 192.168.10.102:7001 192.168.10.102:7002 192.168.10.102:7003 192.168.10.102:7004 192.168.10.102:7005

#集群启动关闭：

#!/bin/sh

/usr/redis/cluster/7000/redis7000/src/redis-cli -p 7000 shutdown

/usr/redis/cluster/7001/redis7001/src/redis-cli -p 7001 shutdown

/usr/redis/cluster/7002/redis7002/src/redis-cli -p 7002 shutdown

/usr/redis/cluster/7003/redis7003/src/redis-cli -p 7003 shutdown

/usr/redis/cluster/7004/redis7004/src/redis-cli -p 7004 shutdown

/usr/redis/cluster/7005/redis7005/src/redis-cli -p 7005 shutdown

if [ $(ps -ef | grep -c redis | grep -cv grep) -gt 1 ]

then echo "集群关机失败，请检查节点"

else

echo "集群全部关闭，ok"

//集群搭建教程 http://redis.io/topics/cluster-tutorial

//集群搭建教程 http://blog.csdn.net/yubinpll9110/article/details/51373890

这里创建6个redis节点，其中三个为主节点，三个为从节点。

redis和端口对应关系：

主服务器

127.0.0.1:7000

127.0.0.1:7001

    127.0.0.1:7002

    从服务器：
    127.0.0.1:7003
    127.0.0.1:7004
    127.0.0.1:7005

    步骤：
    1,下载redis。官网下载3.0.0版本，之前几的版本不支持集群模式

    下载地址：http://download.redis.io/releases/redis-3.0.0.tar.gz
    2：上传服务器，解压，编译
    tar -zxvf redis-3.0.0-rc2.tar.gz
    mv redis-3.0.0-rc2.tar.gz redis3.0
    cd /usr/local/redis3.0
    make & make install

    3：创建集群需要的目录并拷贝redis
    mkdir -p /usr/local/cluster
    mkdir -p /usr/local/cluster/7000
    mkdir -p /usr/local/cluster/7001
    mkdir -p /usr/local/cluster/7002
    mkdir -p /usr/local/cluster/7003
    mkdir -p /usr/local/cluster/7004
    mkdir -p /usr/local/cluster/7005
    cp -rf /usr/local/redis3.0/* /usr/local/cluster/7000/
    cp -rf /usr/local/redis3.0/* /usr/local/cluster/7001/
    cp -rf /usr/local/redis3.0/* /usr/local/cluster/7002/
    cp -rf /usr/local/redis3.0/* /usr/local/cluster/7003/
    cp -rf /usr/local/redis3.0/* /usr/local/cluster/7004/
    cp -rf /usr/local/redis3.0/* /usr/local/cluster/7005/

    4：修改配置文件redis.conf

    vi /usr/local/cluster/7000/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

    #同样再对其它配置文件进行修改
    vi /usr/local/cluster/7001/redis.conf
    vi /usr/local/cluster/7002/redis.conf
    vi /usr/local/cluster/7003/redis.conf
    vi /usr/local/cluster/7004/redis.conf
    vi /usr/local/cluster/7005/redis.conf
    ##注意：不同的目录配置不同的redis.conf中的port

    5：启动6个redis

    cd /usr/local/cluster/7000/src
    redis-server ../redis.conf
    cd /usr/local/cluster/7001/src
    redis-server ../redis.conf
    cd /usr/local/cluster/7002/src
    redis-server ../redis.conf
    cd /usr/local/cluster/7003/src
    redis-server ../redis.conf
    cd /usr/local/cluster/7004/src
    redis-server ../redis.conf
    cd /usr/local/cluster/7005/src
    redis-server ../redis.conf

    ##启动之后使用命令查看redis的启动情况ps -ef|grep redis

    6,创建redis集群
    cd /usr/local/redis3.0/src
    ./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

    6.1执行上面的命令的时候会报错，因为是执行的的脚本，需要
    错误内容：/usr/bin/env: ruby: No such file or directory
    所以需要安装ruby的环境，这里推荐使用yum install ruby

    yum install ruby

    6.2然后再执行第步的创建集群命令，还会报错，提示缺少rubygems组件
    错误内容：
    ./redis-trib.rb:24:in `require': no such file to load -- rubygems (LoadError)
    from ./redis-trib.rb:24
    yum install rubygems

    6.3再次执行第步的命令，还会报错，提示不能加载redis，是因为缺少redis的接口
    错误内容：
    /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- redis (LoadError)
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from ./redis-trib.rb:25

    gem install redis
    这里可能无法安装,因为无法连接gem服务器：
    [@zw_22_90 src]# gem install redis --version 3.0.0
    ERROR: Could not find a valid gem 'redis' (= 3.0.0) in any repository
    ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)

如何使用？

$ gem sources --remove https://rubygems.org/
$ gem sources -a https://ruby.taobao.org/
$ gem sources -l
*** CURRENT SOURCES ***

https://ruby.taobao.org
# 请确保只有 ruby.taobao.org
$ gem install rails

    6.4 再次执行第步的命令，正常执行
    输入yes，然后配置完成。
    [@zw_22_90 src]# ./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: 2022f24d581b4a7c3342e3245c32927cbd5ec16d 127.0.0.1:7000
    slots:0-5460 (5461 slots) master
    M: 37b7008f80f8c21a698da8cb1f1b32db8c0c415c 127.0.0.1:7001
    slots:5461-10922 (5462 slots) master
    M: ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd 127.0.0.1:7002
    slots:10923-16383 (5461 slots) master
    S: b5b76d70bbb0dbf3e7df8a38f1259e95e2054721 127.0.0.1:7003
    replicates 2022f24d581b4a7c3342e3245c32927cbd5ec16d
    S: 6881f8fef9c25da486f320ebf2ead39c1502db4c 127.0.0.1:7004
    replicates 37b7008f80f8c21a698da8cb1f1b32db8c0c415c
    S: f090526d32cced97731eef2a2e1722a7bac7d9ea 127.0.0.1:7005
    replicates ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd
    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: 2022f24d581b4a7c3342e3245c32927cbd5ec16d 127.0.0.1:7000
    slots:0-5460 (5461 slots) master
    M: 37b7008f80f8c21a698da8cb1f1b32db8c0c415c 127.0.0.1:7001
    slots:5461-10922 (5462 slots) master
    M: ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd 127.0.0.1:7002
    slots:10923-16383 (5461 slots) master
    M: b5b76d70bbb0dbf3e7df8a38f1259e95e2054721 127.0.0.1:7003
    slots: (0 slots) master
    replicates 2022f24d581b4a7c3342e3245c32927cbd5ec16d
    M: 6881f8fef9c25da486f320ebf2ead39c1502db4c 127.0.0.1:7004
    slots: (0 slots) master
    replicates 37b7008f80f8c21a698da8cb1f1b32db8c0c415c
    M: f090526d32cced97731eef2a2e1722a7bac7d9ea 127.0.0.1:7005
    slots: (0 slots) master
    replicates ac6dc5fa96e856b34c1ba4c3814394e4ebb698dd
    [OK] All nodes agree about slots configuration.
    >>> Check for open slots...
    >>> Check slots coverage...
    [OK] All 16384 slots covered.

    至此redis集群即搭建成功！

    7，redis-cli命令进入集群环境
    [@zw_22_90 src]# redis-cli -c -p 7000

    127.0.0.1:7000> quit;

posted @ 2016-08-24 16:28 ClearX 阅读(2915) 评论(0) 编辑收藏举报

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Redis 3.0.2集群搭建以及相关问题汇总

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