redis群集服务器的搭建

    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;