redis单机多节点集群

# ##安装Redis

redis安装参考 https://www.cnblogs.com/renxixao/p/11442770.html

Reids安装包里有个集群工具，要复制到/usr/local/bin里去

[root@hdp-01 ~]# cp redis-4.0.12/src/redis-trib.rb /usr/local/bin/

# ##修改配置创建节点

我们现在要搞六个节点，三主三从，端口规定分别是7001，7002，7003，7004，7005，7006

先在root目录下新建一个redis_cluster目录，然后该目录下再创建6个目录，

分别是7001，7002，7003，7004，7005，7006，用来存在redis配置文件；

要使用redis集群，要先修改redis的配置文件redis.conf

[root@hdp-01 ~]# cp redis-4.0.12/src/redis-trib.rb /usr/local/bin

[root@hdp-01 ~]# mkdir redis_cluster

[root@hdp-01 ~]# cd redis_cluster/

[root@hdp-01 redis_cluster]# mkdir 7001 7002 7003 7004 7005 7006
[root@hdp-01 redis_cluster]# cd ..

[root@hdp-01 ~]#  cp redis-4.0.12/redis.conf redis_cluster/7001/

我们修改下这个配置文件

[root@hdp-01 ~]# vi redis_cluster/7001/redis.conf

修改一下几个地方

显示行号：命令行模式下输入set nu 回车

命令行模式下输入/port 回车查找下一个按n

前面有注释的一定要把注释删掉

port 7001 //六个节点配置文件分别是7001-7006

daemonize yes //redis后台运行

pidfile /var/run/redis_7001.pid //pidfile文件对应7001-7006

cluster-enabled yes //开启集群

cluster-config-file nodes_7001.conf //保存节点配置，自动创建，自动更新对应7001-7006

cluster-node-timeout 5000 //集群超时时间，节点超过这个时间没反应就断定是宕机

appendonly yes //存储方式，aof，将写操作记录保存到日志中

7001下的修改完后，把7001下的配置分别复制到7002-7006 然后对应的再修改下配置即可；

[root@hdp-01 ~]#  cp redis_cluster/7001/redis.conf redis_cluster/7002

[root@hdp-01 ~]#  cp redis_cluster/7001/redis.conf redis_cluster/7003

[root@hdp-01 ~]#  cp redis_cluster/7001/redis.conf redis_cluster/7004

[root@hdp-01 ~]#  cp redis_cluster/7001/redis.conf redis_cluster/7005

[root@hdp-01 ~]#  cp redis_cluster/7001/redis.conf redis_cluster/7006

编辑5个目录下相应redis.conf 配置文件，把 port ，pidfile，cluster-config-file 分别修改下即可

启动六个节点的redis

[root@hdp-01 ~]# /usr/local/redis/bin/redis-server redis_cluster/7001/redis.conf

[root@hdp-01 ~]# /usr/local/redis/bin/redis-server redis_cluster/7002/redis.conf

[root@hdp-01 ~]# /usr/local/redis/bin/redis-server redis_cluster/7003/redis.conf

[root@hdp-01 ~]# /usr/local/redis/bin/redis-server redis_cluster/7004/redis.conf

[root@hdp-01 ~]# /usr/local/redis/bin/redis-server redis_cluster/7005/redis.conf

[root@hdp-01 ~]# /usr/local/redis/bin/redis-server redis_cluster/7006/redis.conf

[root@localhost ~]# ps -ef | grep redis

查找下redis进程

说明都启动成功了

# ##创建集群

redis官方提供了redis-trib.rb工具第一步里已经房到里bin下

但是在使用之前需要安装ruby，以及redis和ruby连接

[root@hdp-01 ~]# yum -y install ruby ruby-devel rubygems rpm-build
gem install redis

redis-trib.rb create --replicas 1 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006

创建集群

[root@localhost ~]# redis-trib.rb create --replicas 1 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006

>>> Creating cluster

>>> Performing hash slots allocation on 6 nodes...

Using 3 masters:

127.0.0.1:7001

127.0.0.1:7002

127.0.0.1:7003

Adding replica 127.0.0.1:7004 to 127.0.0.1:7001

Adding replica 127.0.0.1:7005 to 127.0.0.1:7002

Adding replica 127.0.0.1:7006 to 127.0.0.1:7003

M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001

slots:0-5460 (5461 slots) master

M: d61e66e49e669b99d801f22f6461172696fdd1c9 127.0.0.1:7002

slots:5461-10922 (5462 slots) master

M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003

slots:10923-16383 (5461 slots) master

S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004

replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c

S: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005

replicates d61e66e49e669b99d801f22f6461172696fdd1c9

S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006

replicates aa6bc3f1e1174c3a991c01882584707c2408ec18

Can I set the above configuration? (type 'yes' to accept):

从运行结果看主节点就是7001 7002 7003 从节点分别是7004 7005 7006

7001分配到的哈希槽是 0-5460

7002分配到的哈希槽是 5461-10922

7003分配到的哈希槽是 10923-16383

最后问我们是否接受上面的设置，输入yes 就表示接受，我们输入yes

然后显示：

>>> 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 127.0.0.1:7001)

M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001

slots:0-5460 (5461 slots) master

1 additional replica(s)

S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006

slots: (0 slots) slave

replicates aa6bc3f1e1174c3a991c01882584707c2408ec18

M: d61e66e49e669b99d801f22f6461172696fdd1c9 127.0.0.1:7002

slots:5461-10922 (5462 slots) master

1 additional replica(s)

S: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005

slots: (0 slots) slave

replicates d61e66e49e669b99d801f22f6461172696fdd1c9

M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003

slots:10923-16383 (5461 slots) master

1 additional replica(s)

S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004

slots: (0 slots) slave

replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

显示配置哈希槽，以及集群创建成功，可以用了；

第五步：集群数据测试

我们先连接任意一个节点，然后添加一个key：

redis-cli是redis默认的客户端工具，启动时加上｀-c｀参数，`-p`指定端口，就可以连接到集群。

连接任意一个节点端口：

[root@localhost ~]# /usr/local/redis/bin/redis-cli -c -p 7002

127.0.0.1:7002>

我们连接7002

127.0.0.1:7002> set xxx 'fdafda'

-> Redirected to slot [4038] located at 127.0.0.1:7001

前面说过Redis Cluster值分配规则，所以分配key的时候，它会使用CRC16(‘my_name’)%16384算法，来计算，将这个key 放到哪个节点，这里分配到了4038slot 就分配到了7001(0-5460)这个节点上。所以有：

Redirected to slot [4038] located at 127.0.0.1:7001

我们从其他集群节点，都可以获取到数据

127.0.0.1:7001> exit

[root@localhost ~]# /usr/local/redis/bin/redis-cli -c -p 7005

127.0.0.1:7005> get xxx

-> Redirected to slot [4038] located at 127.0.0.1:7001

"fdafda"

127.0.0.1:7001>

第六步：集群宕机测试

假如我们干掉一个节点，比如7002 这个主节点

[root@localhost ~]# ps -ef | grep redis

root 9501 1 0 17:38 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]

root 9512 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7002 [cluster]

root 9516 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]

root 9520 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]

root 9524 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]

root 9528 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]

root 9601 2186 0 18:12 pts/0 00:00:00 grep --color=auto redis

[root@localhost ~]# kill -9 9512

[root@localhost ~]# ps -ef | grep redis

root 9501 1 0 17:38 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]

root 9516 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]

root 9520 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]

root 9524 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]

root 9528 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]

root 9603 2186 0 18:12 pts/0 00:00:00 grep --color=auto redis

[root@localhost ~]#

然后再来看下集群的情况

redis-trib.rb check 127.0.0.1:7001

>>> Performing Cluster Check (using node 127.0.0.1:7001)

M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001

slots:0-5460 (5461 slots) master

1 additional replica(s)

S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006

slots: (0 slots) slave

replicates aa6bc3f1e1174c3a991c01882584707c2408ec18

M: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005

slots:5461-10922 (5462 slots) master

0 additional replica(s)

M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003

slots:10923-16383 (5461 slots) master

1 additional replica(s)

S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004

slots: (0 slots) slave

replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

我们发现 7005本来是从节点，由于他对应的主节点挂了，就自动变成主节点master，所有会有最后一个说明

All 16384 slots covered. 所有哈希槽都可覆盖了；集群可以正常使用；

假如我们把7005也干掉，试试看

[root@localhost ~]# kill -9 9524

[root@localhost ~]# ps -ef | grep redis

root 9501 1 0 17:38 ? 00:00:03 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]

root 9516 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]

root 9520 1 0 17:45 ? 00:00:03 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]

root 9528 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]

root 9610 2186 0 18:16 pts/0 00:00:00 grep --color=auto redis

[root@localhost ~]#

查看下集群情况

redis-trib.rb check 127.0.0.1:7001

这里我们发现出事了，因为主从节点都挂了所以有一部分哈希槽没得分配，最后一句

[ERR] Not all 16384 slots are covered by nodes. 没有安全覆盖；

所以不能正常使用集群；