redis集群部署以及一些坑

开始部署之前，务必先看第6条

1.从官网下载和编译redis安装包

 $ wget  
 $ tar xzf redis-3.2.5.tar.gz
 $ cd redis-3.2.5
 $ make

2.配置redis

 port 7000  
 cluster-enabled yes
 cluster-config-file nodes.conf
 cluster-node-timeout 5000
 appendonly yes

如果你不想做持久化的话，appendonly yes -> appendonly no

假设我们部署3个redis nodes, 那么需要创建6个redis实例，其中3个node为另外3个nodes的slave;
 mkdir cluster-test
 cd cluster-test
 mkdir 7000 7001 7002 7003 7004 7005
保证这6个目录下的redis.conf的port 分别为7000~7005 

3.启动所有redis实例

分别进入六个目录，启动相应的redis-server
cd 7000
../redis-server ./redis.conf

4.安装redis-trib.rb运行环境

 redis-trib.rb是ruby代码，所以先要安装ruby

 yum install ruby  
 gem install redis -- 安装redis依赖

因为墙的问题，gem install redis 可能会失败，改用国内的源
 gem sources --remove  删掉原来的源
 gem sources -a    改用国内的源 
 gem sources -l 查看现有的源 
 gem install redis  安装redis依赖

5.创建集群

 ./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.注意的地方

(1) 使用redis-trib.rb构建集群,完成前不要配置密码

(2) 集群构建完再通过config set + config rewrite命令逐个实例设置密码

(3) 对集群设置密码，requirepass和masterauth都需要设置

(4) 各个节点密码都必须一致，否则Redirected就会失败

 config set masterauth   yourpasswd 
 config set requirepass   yourpasswd
 auth yourpasswd
 config rewrite

(5) 如果提示一下错误，那么是redis依赖版本错误，移除当前redis依赖，安装指定版本即可

/usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/connection/ruby.rb:111:in `rescue in _write_to_socket': Connection timed out (Redis::TimeoutError)  
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/connection/ruby.rb:104:in `_write_to_socket' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/connection/ruby.rb:131:in `block in write' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/connection/ruby.rb:130:in `loop' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/connection/ruby.rb:130:in `write' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/connection/ruby.rb:374:in `write' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:271:in `block in write' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:250:in `io' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:269:in `write' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:228:in `block (3 levels) in process' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:222:in `each' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:222:in `block (2 levels) in process' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:367:in `ensure_connected' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:221:in `block in process' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:306:in `logging' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:220:in `process' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis/client.rb:120:in `call' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis.rb:2705:in `block in method_missing' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis.rb:58:in `block in synchronize' 
        from /usr/local/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis.rb:58:in `synchronize' 
        from /usr/local/lib/ruby/gems/2.3.0/gems/redis-3.3.2/lib/redis.rb:2704:in `method_missing' 
        from ./redis-trib.rb:212:in `flush_node_config' 
        from ./redis-trib.rb:776:in `block in flush_nodes_config' 
        from ./redis-trib.rb:775:in `each' 
        from ./redis-trib.rb:775:in `flush_nodes_config' 
        from ./redis-trib.rb:1296:in `create_cluster_cmd' 
        from ./redis-trib.rb:1701:in ` 

那是gem 删除 redis-3.3.2 插件版本，改用3.0.0

    gem list

    gem uninstall redis --version 3.3.2 

    gem install redis --version 3.0.0

    gem list