Redis单机多节点集群实验

时间 2019-12-10

标签 redis 单机节点集群实验栏目 Redis 繁體版

原文原文链接

第一步：安装Redisnode

前面已经安装过了不解释，redis

Reids安装包里有个集群工具，要复制到/usr/local/bin里去算法

cp redis-3.2.9/src/redis-trib.rb /usr/local/bin安全

第二步：修改配置，建立节点ruby

咱们如今要搞六个节点，三主三从，app

端口规定分别是7001，7002，7003，7004，7005，7006工具

咱们先在root目录下新建一个redis_cluster目录，而后该目录下再建立6个目录，测试

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

这里咱们要使用redis集群，要先修改redis的配置文件redis.confspa

mkdir redis_cluster 新建目录

[root@localhost ~]# cd redis_cluster/

[root@localhost redis_cluster]# mkdir 7001 7002 7003 7004 7005 7006

[root@localhost redis_cluster]# ll

总用量 0

drwxr-xr-x. 2 root root 6 7月 27 17:18 7001

drwxr-xr-x. 2 root root 6 7月 27 17:18 7002

drwxr-xr-x. 2 root root 6 7月 27 17:18 7003

drwxr-xr-x. 2 root root 6 7月 27 17:18 7004

drwxr-xr-x. 2 root root 6 7月 27 17:18 7005

drwxr-xr-x. 2 root root 6 7月 27 17:18 7006

[root@localhost redis_cluster]#

先复制一份配置文件到7001目录下

[root@localhost redis_cluster]# cd

[root@localhost ~]# cp redis-3.2.9/redis.conf redis_cluster/7001/

咱们修改下这个配置文件

vi redis_cluster/7001/redis.conf

修改一下几个

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，自动建立，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判定是宕机

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

7001下的修改完后，咱们把7001下的配置分别复制到7002-7006 而后对应的再修改下配置便可；

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7002/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7003/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7004/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7005/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7006/

[root@localhost ~]# vi redis_cluster/7002/redis.conf

[root@localhost ~]# vi redis_cluster/7003/redis.conf

[root@localhost ~]# vi redis_cluster/7004/redis.conf

[root@localhost ~]# vi redis_cluster/7005/redis.conf

[root@localhost ~]# vi redis_cluster/7006/redis.conf

编辑后面5个配置文件，把 port ，pidfile，cluster-config-file 分别修改下便可；

第三步：启动六个节点的redis

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

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

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

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

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

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

启动六个节点

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

查找下redis进程

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

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

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

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

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

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

说明都启动成功了

第四步：建立集群

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

可是在使用以前须要安装ruby，以及redis和ruby链接

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

建立集群

[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

最后问咱们是否接受上面的设置，输入yes 就表示接受，咱们输入yes

而后显示：

>>> 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，以及集群建立成功，能够用了；

第五步：集群数据测试

咱们先链接任意一个节点，而后添加一个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，就能够链接到集群。

链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>

咱们链接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，因此分配key的时候，它会使用CRC16(‘my_name’)%16384算法，来计算，将这个key 放到哪一个节点，这里分配到了4038slot 就分配到了7001(0-5460)这个节点上。因此有：

Redirected to slot [4038] located at 127.0.0.1:7001

咱们从其余集群节点，均可以获取到数据

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

假如咱们干掉一个节点，好比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 ~]#

而后再来看下集群的状况

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.

咱们发现 7005原本是从节点，因为他对应的主节点挂了，就自动变成主节点master，全部会有最后一个说明

All 16384 slots covered. 全部哈希槽均可覆盖了；集群能够正常使用；

假如咱们把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 ~]#

查看下集群状况

redis-trib.rb check 127.0.0.1:7001

这里咱们发现出事了，由于主从节点都挂了因此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；

因此不能正常使用集群；