集群安装
===============================


准备6个节点：

M节点：10.196.126.29、10.196.126.30、10.196.126.31

S节点：10.196.126.32、10.196.126.33、10.196.126.34


.. code-block:: bash

    sudo apt update
    sudo apt install -y redis-server


.. code-block:: bash

    vim /etc/redis/redis.conf

.. code-block:: text

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

.. code-block:: bash

    sudo systemctl enable redis-server
    sudo systemctl restart redis-server

.. code-block:: bash

    redis-cli --cluster create 10.196.126.29:6379 10.196.126.30:6379 10.196.126.31:6379 10.196.126.32:6379 10.196.126.33:6379 10.196.126.34:6379 --cluster-replicas 1

.. code-block:: text

    >>> Performing hash slots allocation on 6 nodes...
    Master[0] -> Slots 0 - 5460
    Master[1] -> Slots 5461 - 10922
    Master[2] -> Slots 10923 - 16383
    Adding replica 10.196.126.33:6379 to 10.196.126.29:6379
    Adding replica 10.196.126.34:6379 to 10.196.126.30:6379
    Adding replica 10.196.126.32:6379 to 10.196.126.31:6379
    M: cd6cb228e25eca711a48d8cf730fd6ec34d2bd23 10.196.126.29:6379
    slots:[0-5460] (5461 slots) master
    M: d546c2b848786372ca697556434962fb6095da36 10.196.126.30:6379
    slots:[5461-10922] (5462 slots) master
    M: 9c5d117489fdf9a6ac40b04665ad665245f1aedf 10.196.126.31:6379
    slots:[10923-16383] (5461 slots) master
    S: 705ee43fb0093831734736277904c129ed9d27f6 10.196.126.32:6379
    replicates 9c5d117489fdf9a6ac40b04665ad665245f1aedf
    S: 352ab063bff5fcaf2f3389038a6a86ef4f8db2b5 10.196.126.33:6379
    replicates cd6cb228e25eca711a48d8cf730fd6ec34d2bd23
    S: be1cd3b71ddb2083219297d38c97c63e2f056406 10.196.126.34:6379
    replicates d546c2b848786372ca697556434962fb6095da36
    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 10.196.126.29:6379)
    M: cd6cb228e25eca711a48d8cf730fd6ec34d2bd23 10.196.126.29:6379
    slots:[0-5460] (5461 slots) master
    1 additional replica(s)
    S: 352ab063bff5fcaf2f3389038a6a86ef4f8db2b5 10.196.126.33:6379
    slots: (0 slots) slave
    replicates cd6cb228e25eca711a48d8cf730fd6ec34d2bd23
    S: be1cd3b71ddb2083219297d38c97c63e2f056406 10.196.126.34:6379
    slots: (0 slots) slave
    replicates d546c2b848786372ca697556434962fb6095da36
    M: d546c2b848786372ca697556434962fb6095da36 10.196.126.30:6379
    slots:[5461-10922] (5462 slots) master
    1 additional replica(s)
    M: 9c5d117489fdf9a6ac40b04665ad665245f1aedf 10.196.126.31:6379
    slots:[10923-16383] (5461 slots) master
    1 additional replica(s)
    S: 705ee43fb0093831734736277904c129ed9d27f6 10.196.126.32:6379
    slots: (0 slots) slave
    replicates 9c5d117489fdf9a6ac40b04665ad665245f1aedf
    [OK] All nodes agree about slots configuration.
    >>> Check for open slots...
    >>> Check slots coverage...
    [OK] All 16384 slots covered.

使用 --cluster-replicas 1 参数配置集群中每个主节点有1个从节点。

创建集群后，可以使用以下命令来验证集群是否成功创建：

.. code-block:: bash

    redis-cli -h 10.196.126.29 -p 6379 cluster info

.. code-block:: text

    cluster_state:ok
    cluster_slots_assigned:16384
    cluster_slots_ok:16384
    cluster_slots_pfail:0
    cluster_slots_fail:0
    cluster_known_nodes:6
    cluster_size:3
    cluster_current_epoch:6
    cluster_my_epoch:1
    cluster_stats_messages_ping_sent:86
    cluster_stats_messages_pong_sent:87
    cluster_stats_messages_sent:173
    cluster_stats_messages_ping_received:82
    cluster_stats_messages_pong_received:86
    cluster_stats_messages_meet_received:5
    cluster_stats_messages_received:173


你可以在任一节点上运行以下命令来测试集群的基本功能：

.. code-block:: bash

    redis-cli -c -h 10.196.126.29 -p 6379 set foo bar
    redis-cli -c -h 10.196.126.32 -p 6379 get foo

为了确保Redis集群正常运行，需要设置适当的持久化机制（例如：RDB或AOF），并启用监控和高可用性（如使用Redis Sentinel）。