Redis集群环境搭建（实验）

环境信息：

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    集群中至少有奇数个主节点，所以至少三个主节点，

    每个节点至少一个备份节点，所以共6个节点（master和slave各3个）

节点信息：（我这里准备了3台主机，每台主机运行一个master和一个slave）

    节点1：192.168.2.100：6379     master

    节点2：192.168.2.100：6380     slave

    节点3：192.168.2.200：6379     master

    节点4：192.168.2.200：6380     slave

    节点5：192.168.2.201：6379     master

    节点6：192.168.2.201：6380     slave 

master和slave安装路径：

    master：/usr/local/redis-3.0.6-6379

    slave：/usr/local/redis-3.0.6-6380

master配置文件:

    daemonize yes                           //开启后台运行

    pidfile /var/run/redis_6379.pid                    //pid文件

    port 6379                                        //端口

    bind 192.168.2.100                        //默认127.0.0.1，需要改为其他节点可访问的地址

    logfile "/usr/local/redis-3.0.6-6379/redis_6379.log"     //log文件路径

    dir /usr/local/redis-3.0.6-6379/             //RDB文件路径

    appendonly yes                               //开启AOF持久化

    cluster-enabled yes                      //开启集群

    cluster-config-file nodes-6379.conf        //集群配置文件

    cluster-node-timeout 15000          //请求超时，默认15秒

slave配置文件:

    daemonize yes

    pidfile /var/run/redis_6380.pid

    port 6380

    bind 192.168.2.100

    logfile "/usr/local/redis-3.0.6-6380/redis_6380.log"

    dir /usr/local/redis-3.0.6-638/

    appendonly yes

    cluster-enabled yes

    cluster-config-file nodes-6380.conf

    cluster-node-timeout 15000

启动redis

    # redis-server redis.conf         //6个节点

    # ps -ef |grep redis

        root      22584      1  0 17:41 ?        00:00:00 redis-server 192.168.2.100:6379 [cluster]

        root      22599      1  0 17:41 ?        00:00:00 redis-server 192.168.2.100:6380 [cluster]

        root      22606   6650  0 17:41 pts/0    00:00:00 grep --color=auto redis

安装ruby环境：（redis-trib.rb命令，需要在ruby环境中执行）

    # yum -y install ruby ruby-devel rubygems rpm-build

    # gem install redis

       Successfully installed redis-3.2.1

        Parsing documentation for redis-3.2.1

        1 gem installed

    可能会遇到的报错：

        ERROR:  Could not find a valid gem 'redis' (>= 0), here is why:

          Unable to download data from https://rubygems.org/ - no such name (https://rubygems.org/latest_specs.4.8.gz)

    手动下载：https://rubygems.global.ssl.fastly.net/gems/redis-3.2.1.gem

     执行：# gem install -l ./redis-3.2.1.gem

创建集群：

    将redis-trib.rb复制到/usr/local/bin目录下

    # cp /usr/local/redis-3.0.6-6379/src/redis-trib.rb /usr/local/bin/

    # redis-trib.rb create --replicas 1 192.168.2.100:6379 192.168.2.100:6380 192.168.2.200:6379         192.168.2.200:6380 192.168.2.201:6379 192.168.2.201:6380     //创建集群

        >>> Creating cluster

        >>> Performing hash slots allocation on 6 nodes...

        Using 3 masters:

        192.168.2.100:6379     //3个master节点

        192.168.2.200:6379

        192.168.2.201:6379

        Adding replica 192.168.2.200:6380 to 192.168.2.100:6379     //3个slave节点

        Adding replica 192.168.2.100:6380 to 192.168.2.200:6379

        Adding replica 192.168.2.201:6380 to 192.168.2.201:6379

        M: 098e7eb756b6047fde988ab3c0b7189e1724ecf5 192.168.2.100:6379

        slots:0-5460 (5461 slots) master         //hash slot [0-5460]

        S: 7119dec91b086ca8fe69f7878fa42b1accd75f0f 192.168.2.100:6380

        replicates 5844b4272c39456b0fdf73e384ff8c479547de47

        M: 5844b4272c39456b0fdf73e384ff8c479547de47 192.168.2.200:6379

        slots:5461-10922 (5462 slots) master         //hash slot [5461-10922]

        S: 227f51028bbe827f27b4e40ed7a08fcc7d8df969 192.168.2.200:6380

        replicates 098e7eb756b6047fde988ab3c0b7189e1724ecf5

        M: 3ff3a74f9dc41f8bc635ab845ad76bf77ffb0f69 192.168.2.201:6379

        slots:10923-16383 (5461 slots) master         //hash slot [10923-16383]

        S: 2faf68564a70372cfc06c1afff197019cc6a39f3 192.168.2.201:6380

        replicates 3ff3a74f9dc41f8bc635ab845ad76bf77ffb0f69

        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 192.168.2.100:6379)

        M: 098e7eb756b6047fde988ab3c0b7189e1724ecf5 192.168.2.100:6379

        slots:0-5460 (5461 slots) master

        M: 7119dec91b086ca8fe69f7878fa42b1accd75f0f 192.168.2.100:6380

        slots: (0 slots) master

        replicates 5844b4272c39456b0fdf73e384ff8c479547de47

        M: 5844b4272c39456b0fdf73e384ff8c479547de47 192.168.2.200:6379

        slots:5461-10922 (5462 slots) master

        M: 227f51028bbe827f27b4e40ed7a08fcc7d8df969 192.168.2.200:6380

        slots: (0 slots) master

        replicates 098e7eb756b6047fde988ab3c0b7189e1724ecf5

        M: 3ff3a74f9dc41f8bc635ab845ad76bf77ffb0f69 192.168.2.201:6379

        slots:10923-16383 (5461 slots) master

        M: 2faf68564a70372cfc06c1afff197019cc6a39f3 192.168.2.201:6380

        slots: (0 slots) master

        replicates 3ff3a74f9dc41f8bc635ab845ad76bf77ffb0f69

        [OK] All nodes agree about slots configuration.      //所有节点都同意槽配置

        >>> Check for open slots...          //开始检查槽

        >>> Check slots coverage...         //检查槽的覆盖率

        [OK] All 16384 slots covered.         //所有的槽（16384个槽）都被覆盖（分配）

到此，redis集群环境部署完成。