cluster分片集群模式搭建

比眉伴天荒 2021-10-23 19:42 350阅读 0赞

## step.1 安装redis，已安装可跳过 ##

sudo apt-get install redis-server

## step.2 配置cluster的reids.conf ##

# 创建cluster配置目录
    sudo mkdir -p /data/redis-cluster/{conf,db,log}

配置6个redis实例，redis\_7001.conf配置项目如下(以7001端口为例)

port 7001
    daemonize  yes
    pidfile "/var/run/redis/7001.pid"
    logfile "/data/redis-cluster/log/7001.log"
    
    cluster-enabled yes
    cluster-config-file nodes.conf
    cluster-node-timeout 5000
    
    appendonly yes
    dir "/data/redis-cluster/db"
    dbfilename "7001_dump.rdb"
    appendfilename "7001_appendonly.aof"
    # 注意，因为6个配置文件db库都在一个目录下/data/db/，所以默认文件名都需要修改，以免冲突

## step.3 启动6个实例 ##

sudo redis-server /data/redis-server/conf/redis_7001.conf
    sudo redis-server /data/redis-server/conf/redis_7002.conf
    sudo redis-server /data/redis-server/conf/redis_7003.conf
    sudo redis-server /data/redis-server/conf/redis_8001.conf
    sudo redis-server /data/redis-server/conf/redis_8002.conf
    sudo redis-server /data/redis-server/conf/redis_8003.conf

查看一下，是否正常启动 `ps -aux|grep redis`

root     15370  0.0  0.0  41876  3680 ?        Ssl  12:01   0:07 redis-server *:7001 [cluster]
    root     15379  0.0  0.0  41876  3656 ?        Ssl  12:01   0:07 redis-server *:7002 [cluster]
    root     15386  0.0  0.0  41876  3700 ?        Ssl  12:01   0:07 redis-server *:7003 [cluster]
    root     15393  0.0  0.0  41876  3692 ?        Ssl  12:01   0:07 redis-server *:8001 [cluster]
    root     15400  0.0  0.0  41876  3644 ?        Ssl  12:02   0:07 redis-server *:8002 [cluster]
    root     15407  0.0  0.0  41876  3692 ?        Ssl  12:02   0:07 redis-server *:8003 [cluster]

## step.4 使用自带的redis-trib.rb工具集创建cluster ##

`redis-trib.rb` 是redis官方推出的管理redis集群的工具，集成在redis的源码src目录下，是基于redis提供的集群命令封装成简单、便捷、实用的操作工具,用于给各节点发指令创建集群、检查集群状态或给集群重新分片等。redis-trib.rb是redis作者用ruby完成的。

使用apt-get 安装的，可以在`/usr/share/doc/redis-tool/`目录下找到，可以该工作集拷贝到`/data/redis-cluster/`下

`redis-trib.rb`是ruby语言开发的，因此需要安装ruby环境

# 安装ruby
    sudo apt-get install ruby
    
    # 拷贝redis-trib.rb
    sudo cp /usr/share/doc/redis-tools/examples/redis-trib.rb /data/redis-cluster/

## step.5 运行`redis-trib.rb` 开始配置cluster ##

sudo ./redis-trib.rb create --replicas 1 10.0.2.8:7001 10.0.2.8:7002 10.0.2.8:7003 10.0.2.8:8001 10.0.2.8:8002 10.0.2.8:8003
    >>> Creating cluster
    >>> Performing hash slots allocation on 6 nodes...
    Using 3 masters:
    10.0.2.8:7001
    10.0.2.8:7002
    10.0.2.8:7003
    Adding replica 10.0.2.8:8002 to 10.0.2.8:7001
    Adding replica 10.0.2.8:8003 to 10.0.2.8:7002
    Adding replica 10.0.2.8:8001 to 10.0.2.8:7003
    >>> Trying to optimize slaves allocation for anti-affinity
    [WARNING] Some slaves are in the same host as their master
    M: 5f54805f02b6666589ed7f014b454555fba42d62 10.0.2.8:7001
       slots:0-5460 (5461 slots) master
    M: bfb4b4d0b909e13fd3171cc38afac715dc952078 10.0.2.8:7002
       slots:5461-10922 (5462 slots) master
    M: e851101f2f61d5fec8550cecc7e5708683727d7f 10.0.2.8:7003
       slots:10923-16383 (5461 slots) master
    S: 1f758f3dcca92e3694f9b4dfd35733eb2109f9f0 10.0.2.8:8001
       replicates 5f54805f02b6666589ed7f014b454555fba42d62
    S: c41e95ad470d5377cdeac57079d9b50fb070aba9 10.0.2.8:8002
       replicates bfb4b4d0b909e13fd3171cc38afac715dc952078
    S: 3349f8e30c1267c99e4e64377060fb84605b4a3c 10.0.2.8:8003
       replicates e851101f2f61d5fec8550cecc7e5708683727d7f
    Can I set the above configuration? (type 'yes' to accept):

这里用的命令是create，因为我们需要创建一个新的集群。选项”–replicas 1”表示每个主节点需要一个从节点。其他参数就是需要加入这个集群的Redis实例的地址。

输入yes后

>>> 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 10.0.2.8:7001)
    M: 5f54805f02b6666589ed7f014b454555fba42d62 10.0.2.8:7001
       slots:0-5460 (5461 slots) master
       1 additional replica(s)
    S: c41e95ad470d5377cdeac57079d9b50fb070aba9 10.0.2.8:8002
       slots: (0 slots) slave
       replicates bfb4b4d0b909e13fd3171cc38afac715dc952078
    S: 1f758f3dcca92e3694f9b4dfd35733eb2109f9f0 10.0.2.8:8001
       slots: (0 slots) slave
       replicates 5f54805f02b6666589ed7f014b454555fba42d62
    M: bfb4b4d0b909e13fd3171cc38afac715dc952078 10.0.2.8:7002
       slots:5461-10922 (5462 slots) master
       1 additional replica(s)
    S: 3349f8e30c1267c99e4e64377060fb84605b4a3c 10.0.2.8:8003
       slots: (0 slots) slave
       replicates e851101f2f61d5fec8550cecc7e5708683727d7f
    M: e851101f2f61d5fec8550cecc7e5708683727d7f 10.0.2.8:7003
       slots:10923-16383 (5461 slots) master
       1 additional replica(s)
    [OK] All nodes agree about slots configuration.
    >>> Check for open slots...
    >>> Check slots coverage...
    [OK] All 16384 slots covered.

我们创建的集群有3个主节点和3个从节点。

集群会被配置并彼此连接好，意思是各节点实例被引导彼此通话并最终形成集群。16384个哈希槽都被主节点正常服务着。

## step.6 测试cluster集群 ##

### 连接客户端 ###

$ redis-cli -c -p 7001
    # 这里要加上 -c这个参数，如果不加，当key所在的slots槽在别的redis节点时，会返回`MOVED <slots No.> <ip> <port>`。
    # 加上-c后，会自动切换去别相关的连接
    
    # 查看redis集群各节点
    redis> cluster nodes

### 高可用测试kill掉7001 ###

sudo kill <7001pid>
    # 8001迅速补上