Redis搭建集群教程

桃扇骨 2022-02-17 02:58 307阅读 0赞

### 集群环境说明 ###

现有三台服务器, 每台服务器分布两个节点一个(6379),一个(6380)
        -> ps：实际生产中主从服务器是分布在两个服务器上的
    192.168.2.111 -> 节点一(6379), 节点二(6380)
    192.168.2.112 -> 节点三(6379), 节点四(6380)
    192.168.2.113 -> 节点五(6379), 节点六(6380)
    
    单台服务器目录结构：
        /usr/local
            -> redis
                ->bin
                ->logs
                ->redis_6379.pid
                ->redis.conf
            -> redis6380
                ->bin
                ->logs
                ->redis_6380.pid
                ->redis.conf
                
    redis.conf配置项
        port xxxx：对应端口
        bind 0.0.0.0 (ps:时间开发中写对应的ip,, bind 192.168.2.112 192.168.2.113)
        cluster-enabled yes：加入集群
        cluster-config-file nodes-6379.conf(对应端口)
        cluster-node-timeout 5000
        appendonly yes
        appendfilename "appendonly.aof"
        dir /usr/local/redis/
    
        
    编写两台redis启动脚本(实际开发不需要，这里是为了测试方便)    
    vim start_redis.sh
        cd /usr/local/redis
        ./bin/redis-server ./redis.conf
        cd ..
        cd /usr/local/redis6380
        ./bin/redis-server ./redis.conf
     chmod +x start_redis.sh
     
     关闭执行 pkill redis   (关闭所有redis服务)
     启动执行 /usr/local/start_redis.sh

redis5开启集群配置：

1：redis-cli --cluster create 192.168.2.111:6379 192.168.2.112:6379 192.168.2.113:6379 192.168.2.111:6380 192.168.2.112:6380 192.168.2.113:6380 --cluster-replicas 1
    
    说明：cluster-replicas 1意味着我们希望为每个主机创建一个从服务
    
    [root@192 redis]# redis-cli --cluster create 192.168.2.111:6379 192.168.2.112:6379 192.168.2.113:6379 192.168.2.111:6380 192.168.2.112:6380 192.168.2.113:6380 --cluster-replicas 1
    >>> Performing hash slots allocation on 6 nodes...
    Master[0] -> Slots 0 - 5460
    Master[1] -> Slots 5461 - 10922
    Master[2] -> Slots 10923 - 16383
    Adding replica 192.168.2.112:6380 to 192.168.2.111:6379
    Adding replica 192.168.2.111:6380 to 192.168.2.112:6379
    Adding replica 192.168.2.113:6380 to 192.168.2.113:6379
    >>> Trying to optimize slaves allocation for anti-affinity
    [OK] Perfect anti-affinity obtained!
    M: 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 192.168.2.111:6379
       slots:[0-5460] (5461 slots) master
    M: 75b477ef4967c1bf50502cb834df3fd5660cfa22 192.168.2.112:6379
       slots:[5461-10922] (5462 slots) master
    M: ebc80d8dcabe30645b96fdfe08de84f52a42cbff 192.168.2.113:6379
       slots:[10923-16383] (5461 slots) master
    S: f3dbdddc6c2dc23e1dde2e6e6662c6c5ebf167e9 192.168.2.111:6380
       replicates 75b477ef4967c1bf50502cb834df3fd5660cfa22
    S: e6d09dcaa252336190e4e8747a60d067572d5156 192.168.2.112:6380
       replicates ebc80d8dcabe30645b96fdfe08de84f52a42cbff
    S: 5da5d0d7f7036c971926a821b33764fb2c78ea50 192.168.2.113:6380
       replicates 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a
    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 192.168.2.111:6379)
    M: 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 192.168.2.111:6379
       slots:[0-5460] (5461 slots) master
       1 additional replica(s)
    M: 75b477ef4967c1bf50502cb834df3fd5660cfa22 192.168.2.112:6379
       slots:[5461-10922] (5462 slots) master
       1 additional replica(s)
    M: ebc80d8dcabe30645b96fdfe08de84f52a42cbff 192.168.2.113:6379
       slots:[10923-16383] (5461 slots) master
       1 additional replica(s)
    S: e6d09dcaa252336190e4e8747a60d067572d5156 192.168.2.112:6380
       slots: (0 slots) slave
       replicates ebc80d8dcabe30645b96fdfe08de84f52a42cbff
    S: f3dbdddc6c2dc23e1dde2e6e6662c6c5ebf167e9 192.168.2.111:6380
       slots: (0 slots) slave
       replicates 75b477ef4967c1bf50502cb834df3fd5660cfa22
    S: 5da5d0d7f7036c971926a821b33764fb2c78ea50 192.168.2.113:6380
       slots: (0 slots) slave
       replicates 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a
    [OK] All nodes agree about slots configuration.
    >>> Check for open slots...
    >>> Check slots coverage...
    [OK] All 16384 slots covered.

问题

1：Could not connect to Redis at 192.168.2.111:6379: No route to host
    参考redis与防火墙设置
    
    2：redis-cli --cluster create一直在等待
    有可能是监控端口没有开放 端口+10000 -> 例如16379端口
    
    3： [ERR] Node 192.168.2.111:6379 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
        1)、将需要新增的节点下aof、rdb等本地备份文件删除；
        
        2)、同时将新Node的集群配置文件删除,即：删除你redis.conf里面cluster-config-file所在的文件；
        
        3)、使用redis-cli -c -h -p登录每个redis节点，使用以下命令
        flushdb
        cluster reset   
        
       
       
    4：节点检查    
    以检查节点“.168.2.111:6381”的状态为例：
    redis-cli --cluster check 192.168.2.111:6381
    
    如发现如下这样的错误：
    [WARNING] Node 192.168.2.111:6381 has slots in importing state 5461.
    [WARNING] The following slots are open: 5461.
    
    可以使用redis命令取消slots迁移（5461为slot的ID）：
    先连接对应redis-cli：redis-cli --cluster check 192.168.2.111:6381
    执行：cluster setslot 5461 stable

集群基础操作

# 连接集群
    redis-cli -h 192.168.2.111 -p 6379 -c  (ps: -c 代表用集群的方式连接)
    
    # 新增示例
    192.168.2.111:6379> set name iwester
    -> Redirected to slot [5798] located at 192.168.2.112:6379
    OK
    ps: 添加会根据key计算放到哪一个哈希槽中，自动跳转
    
    # 获取示例
    192.168.2.111:6379> get name
    -> Redirected to slot [5798] located at 192.168.2.112:6379
    "iwester"
    ps: 从111:6379端口获取放到112:6379中的内容，会自动跳转到对应的服务端口
    
    # 检查集群节点是否正常
    redis-cli --cluster check 192.168.2.111:6380
        -> 可以看到集群中节点情况， 包含keys的数量，分布，包含每个节点分配的槽数。运行状态
    
    # 查看集群信息
    192.168.2.112:6379> cluster info
        cluster_state:ok   -> 状态ok
        cluster_slots_assigned:16384  -> 16384个槽 
        cluster_slots_ok:16384        -> 正常状态槽的数量
        cluster_slots_pfail:0
        cluster_slots_fail:0
        cluster_known_nodes:6
        cluster_size:3
        cluster_current_epoch:6
        cluster_my_epoch:2
        cluster_stats_messages_ping_sent:1029
        cluster_stats_messages_pong_sent:1157
        cluster_stats_messages_meet_sent:5
        cluster_stats_messages_sent:2191
        cluster_stats_messages_ping_received:1157
        cluster_stats_messages_pong_received:1034
        cluster_stats_messages_received:2191
    
    
    # 查看集群节点信息
    192.168.2.112:6379> cluster nodes
        ebc80d8dcabe30645b96fdfe08de84f52a42cbff 192.168.2.113:6379@16379 master - 0 1555494741000 3 connected 10923-16383
        解释：
            -> ebc80d8dcabe30645b96fdfe08de84f52a42cbff：当前节点id
            -> 192.168.2.113:6379: ip端口号
            -> 16379 : 监控端口号
            -> master - 0： 主节点
            -> slave 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a：从节点 + 主节点id
            -> connected 10923-16383 : 分布的哈希槽区间, 从节点没有哈希槽
        63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 192.168.2.111:6379@16379 master - 0 1555494741371 1 connected 0-5460
        5da5d0d7f7036c971926a821b33764fb2c78ea50 192.168.2.113:6380@16380 slave 63cfbaf1e7d7d9fce095d0f485776ba15404bf8a 0 1555494742000 6 connected
        e6d09dcaa252336190e4e8747a60d067572d5156 192.168.2.112:6380@16380 slave ebc80d8dcabe30645b96fdfe08de84f52a42cbff 0 1555494741000 5 connected
        75b477ef4967c1bf50502cb834df3fd5660cfa22 192.168.2.112:6379@16379 myself,master - 0 1555494742000 2 connected 5461-10922
        f3dbdddc6c2dc23e1dde2e6e6662c6c5ebf167e9 192.168.2.111:6380@16380 slave 75b477ef4967c1bf50502cb834df3fd5660cfa22 0 1555494742382 4 connected        
        
    # 集群操作帮助
    root@192 redis6382]# redis-cli --cluster help