redis集群搭建步骤

============ Redis 集群 ============

1、说明：至少6台，3主3从，本例中【7001[master1]、7002[master2]、7003[master3]、7004[slave1]、7005[slave2]、7006[slave3]】，搭建在同台机器上

2、搭建步骤：

  1)、递归创建文件夹：【mkdir -p /usr/local/redis-cluster】
  
  2)、在/usr/local/redis-cluster目录下创建6个文件夹：【mkdir 7001、mkdir 7002、mkdir 7003、mkdir 7004、mkdir 7005、mkdir 7006】
  
  3)、将redis.conf配置文件分别copy到700*下，进行修改各个文件的内容
    (1)、后台启动：【daemonize yes】
	(2)、端口号：【port 700*】
	(3)、绑定当前机器IP：【bind 192.168.56.101】
	(4)、指定数据文件存放路径：【dir /usr/local/redis-cluster/700*/】,不修改担心丢失数据
	(5)、持久方式开启快照：【appendonly yes】，生产上用【appendfsync always】
	(6)、启动集群模式：【cluster-enabled yes】
	(7)、节点配置文件与端口号对应：【cluster-config-file nodes700*.conf】，让每个节点相互知道对方的存在
	(8)、设置超时时间：【cluster-node-timeout 15000】
	
  4.1)、集群用到ruby命令，因此安装ruby，方式一
    (1)、【yum install ruby】
	(2)、【yum install rubygems】
	(3)、【gem install redis】,安装redis和ruby接口,redis版本要2.2.x以上
	
  4.2)、集群用到ruby命令，因此安装ruby，方式二
    (1)、安装rvm
	  1]、切换到root目录下：【cd /】
	  2]、【gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB】
      3]、【curl -sSL https://get.rvm.io | bash -s stable】
      4]、【source /etc/profile.d/rvm.sh】
      5]、查看是否安装成功：【rvm -v】
	(2)、安装ruby：【rvm install 2.4.2】
	(3)、【gem install redis】,安装redis和ruby接口,redis版本要2.2.x以上
	
  5)、逐个启动6个redis实例：【/usr/local/redis/bin/redis-server /usr/local/redis-cluster/700*/redis.conf】
  
  6)、检查是否启动成功：【ps -ef | grep redis】,查看是否已存在对应进程
  
  7)、在redis的安装目录下，执行集群脚本，启动集群：【/usr/local/redis-3.0.7/src/redis-trib.rb create --replicas 1 192.168.56.101:7001 192.168.56.101:7002 192.168.56.101:7003 192.168.56.101:7004 192.168.56.101:7005 192.168.56.101:7006】，下次重启机器不需要此操作
  注：其中的 1 为主节点与从节点的比值(1 = 主节点数量/从节点数量),主节点排完，接着排从节点，一一对应，例如，7001为master1，则7004为slave1
  
  8)、连接任意客户端：【/usr/local/redis/bin/redis-cli -c -h 192.168.56.101 -p 7001】(./redis-cli -c -h -p),[-c 表示集群模式，-h指定ip,-p指定端口号]
  
  9)、验证集群是否搭建成功：查看集群信息【cluster info】，查看集群节点【cluster nodes】
  
  10)、关闭集群：【/usr/local/redis/bin/redis-cli -c -h 192.168.56.101 -p 700* shutdown】，需要逐个关闭
  
  11)、注意：出现集群无法启动时，删除临时的数据文件，再次重新启动每个redis服务，然后重新构建集群环境
  
  12)、启动成功时返回的信息：
[root@localhost src]# /usr/local/redis-3.0.7/src/redis-trib.rb create --replicas 1 192.168.56.101:7001 192.168.56.101:7002 192.168.56.101:7003 192.168.56.101:7004 192.168.56.101:7005 192.168.56.101:7006
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.56.101:7001
192.168.56.101:7002
192.168.56.101:7003
Adding replica 192.168.56.101:7004 to 192.168.56.101:7001
Adding replica 192.168.56.101:7005 to 192.168.56.101:7002
Adding replica 192.168.56.101:7006 to 192.168.56.101:7003
M: dbad2a94ae14569188a0ea2a0a645d8fcd023486 192.168.56.101:7001
   slots:0-5460 (5461 slots) master
M: f668dbe36e0af1aca1242659b8f4ad561257f9d8 192.168.56.101:7002
   slots:5461-10922 (5462 slots) master
M: b7e323d03ec1eab723c563125a19606039b6da8f 192.168.56.101:7003
   slots:10923-16383 (5461 slots) master
S: 242f06fa14821f7d5ff698e7459b8138b96b0161 192.168.56.101:7004
   replicates dbad2a94ae14569188a0ea2a0a645d8fcd023486
S: ba721da0c5da588b834fe4525e0c1860aaa44bb0 192.168.56.101:7005
   replicates f668dbe36e0af1aca1242659b8f4ad561257f9d8
S: d5082dbe9ab6c70e2592864dd814bb3ac72920ac 192.168.56.101:7006
   replicates b7e323d03ec1eab723c563125a19606039b6da8f
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 192.168.56.101:7001)
M: dbad2a94ae14569188a0ea2a0a645d8fcd023486 192.168.56.101:7001
   slots:0-5460 (5461 slots) master
M: f668dbe36e0af1aca1242659b8f4ad561257f9d8 192.168.56.101:7002
   slots:5461-10922 (5462 slots) master
M: b7e323d03ec1eab723c563125a19606039b6da8f 192.168.56.101:7003
   slots:10923-16383 (5461 slots) master
M: 242f06fa14821f7d5ff698e7459b8138b96b0161 192.168.56.101:7004
   slots: (0 slots) master
   replicates dbad2a94ae14569188a0ea2a0a645d8fcd023486
M: ba721da0c5da588b834fe4525e0c1860aaa44bb0 192.168.56.101:7005
   slots: (0 slots) master
   replicates f668dbe36e0af1aca1242659b8f4ad561257f9d8
M: d5082dbe9ab6c70e2592864dd814bb3ac72920ac 192.168.56.101:7006
   slots: (0 slots) master
   replicates b7e323d03ec1eab723c563125a19606039b6da8f
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
redis集群搭建步骤

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