一、搭建流程
redis集群至少需要3个redis实例,不过官方推荐采用6个实例;3个master,3个slave。
那么我们需要做以下几件事:
1)编译一个redis-server
2)创建6个redis.conf配置文件
3)启动6个redis实例
4)redis-trib.rb创建集群
二、创建集群
1)编译一个redis-server
$ wget http://download.redis.io/releases/redis-4.0.10.tar.gz $ tar xzf redis-4.0.10.tar.gz $ cd redis-4.0.10 $ make
详细可以参考:https://www.cnblogs.com/lay2017/p/9248454.html
2)创建6个redis.conf配置文件
我们先创建以下文件夹目录:
mkdir redis-cluster cd redis-cluster mkdir 7000 7001 7002 7003 7004 7005
然后我们将第一步编译出来的src/redis-server拷贝一份到redis-cluster下,然后把redis.conf拷贝6份分别放入到上面创建的6个文件夹内。
分别修改每个redis.conf的内容:
port 7000 cluster-enabled yes cluster-config-file nodes.conf cluster-node-timeout 5000 appendonly yes daemonize yes
这里的port分别设置为:7000、7001、7002、7003、7004、7005
3)启动6个redis实例
./redis-server 7000/redis.conf
分别执行启动命令,加载redis.conf配置文件
查看一下启动进程:
ps -ef | grep redis
显示如下:
501 37933 1 0 9:10PM ?? 0:03.85 ../redis-server 127.0.0.1:7000 [cluster] 501 37941 1 0 9:11PM ?? 0:03.82 ../redis-server 127.0.0.1:7001 [cluster] 501 37949 1 0 9:11PM ?? 0:03.82 ../redis-server 127.0.0.1:7002 [cluster] 501 37968 1 0 9:11PM ?? 0:03.75 ../redis-server 127.0.0.1:7003 [cluster] 501 37977 1 0 9:11PM ?? 0:03.76 ../redis-server 127.0.0.1:7004 [cluster] 501 37988 1 0 9:12PM ?? 0:03.76 ../redis-server 127.0.0.1:7005 [cluster]
则表示每个实例已经启动成功
4)redis-trib.rb创建集群
在src目录下自带了redis-trib.rb可以用于创建集群
但是在使用之前 需要安装ruby,以及redis和ruby连接
yum -y install ruby ruby-devel rubygems rpm-build gem install redis
然后采用redis-trib.rb创建集群
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
如果你最终看到:
[OK] All 16384 slots covered
说明集群创建完成
我们可以用命令检查一下目前的集群情况
./redis-trib.rb check 127.0.0.1:7000
输出内容如下:
>>> Performing Cluster Check (using node 127.0.0.1:7000) M: ca34d6741d5b3f5bfc7941c652a09961fddb6d0a 127.0.0.1:7000 slots:0-5460 (5461 slots) master 1 additional replica(s) S: e04be0db2d11fb98133c163bd97426e0f3f2f540 127.0.0.1:7003 slots: (0 slots) slave replicates ca34d6741d5b3f5bfc7941c652a09961fddb6d0a M: 048c96b56c043aab8d297b147cfe7068c74498c9 127.0.0.1:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s) M: b711233443a7a097511fc1681403f2d83b5c8773 127.0.0.1:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s) S: cb6ee10ec8a45f68efddc84b4acaf01fbd244627 127.0.0.1:7005 slots: (0 slots) slave replicates 048c96b56c043aab8d297b147cfe7068c74498c9 S: b630796514a48438d177fbe8f89610f1afe9b41f 127.0.0.1:7004 slots: (0 slots) slave replicates b711233443a7a097511fc1681403f2d83b5c8773 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
我们看到:
master主节点是:7000、7001、7002,7003是7000的从节点、7004是7001的从节点、7005是7002的从节点;
7000分配的哈希槽[0,5460],7001分配的哈希槽[5461,10922],7002分配的哈希槽[10923,16383]
5)测试
5-1、测试设置值、取值
我们使用redis-cli命令连接7000,并设置一个值:
lay-macdeAir:redis-cluster lay$ ./redis-cli -c -p 7000 127.0.0.1:7000> set name lay -> Redirected to slot [5798] located at 127.0.0.1:7001 OK
我们连接7001,执行获取这个值:
lay-macdeAir:redis-cluster lay$ ./redis-cli -c -p 7001 127.0.0.1:7001> get name "lay"
我们发现我们从7001中获取7000设置的值,集群的数据共享成功。
5-2、测试主从切换
当前有6个实例
501 37933 1 0 9:10PM ?? 0:03.85 ../redis-server 127.0.0.1:7000 [cluster] 501 37941 1 0 9:11PM ?? 0:03.82 ../redis-server 127.0.0.1:7001 [cluster] 501 37949 1 0 9:11PM ?? 0:03.82 ../redis-server 127.0.0.1:7002 [cluster] 501 37968 1 0 9:11PM ?? 0:03.75 ../redis-server 127.0.0.1:7003 [cluster] 501 37977 1 0 9:11PM ?? 0:03.76 ../redis-server 127.0.0.1:7004 [cluster] 501 37988 1 0 9:12PM ?? 0:03.76 ../redis-server 127.0.0.1:7005 [cluster]
我们先杀死7000
lay-macdeAir:redis-cluster lay$ kill -9 37933 lay-macdeAir:redis-cluster lay$ ps -ef|grep redis 501 37941 1 0 9:11PM ?? 0:05.08 ../redis-server 127.0.0.1:7001 [cluster] 501 37949 1 0 9:11PM ?? 0:05.08 ../redis-server 127.0.0.1:7002 [cluster] 501 37968 1 0 9:11PM ?? 0:05.02 ../redis-server 127.0.0.1:7003 [cluster] 501 37977 1 0 9:11PM ?? 0:05.00 ../redis-server 127.0.0.1:7004 [cluster] 501 37988 1 0 9:12PM ?? 0:05.01 ../redis-server 127.0.0.1:7005 [cluster]
检查现在集群情况
lay-macdeAir:redis-cluster lay$ ./redis-trib.rb check 127.0.0.1:7001 >>> Performing Cluster Check (using node 127.0.0.1:7001) M: b711233443a7a097511fc1681403f2d83b5c8773 127.0.0.1:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s) S: cb6ee10ec8a45f68efddc84b4acaf01fbd244627 127.0.0.1:7005 slots: (0 slots) slave replicates 048c96b56c043aab8d297b147cfe7068c74498c9 M: 048c96b56c043aab8d297b147cfe7068c74498c9 127.0.0.1:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s) M: e04be0db2d11fb98133c163bd97426e0f3f2f540 127.0.0.1:7003 slots:0-5460 (5461 slots) master 0 additional replica(s) S: b630796514a48438d177fbe8f89610f1afe9b41f 127.0.0.1:7004 slots: (0 slots) slave replicates b711233443a7a097511fc1681403f2d83b5c8773 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
我们看到7000挂掉以后它的从节点7003提升为了主节点,并且所有16384个哈希槽都覆盖了
以上我们简单实现了redis-cluster模块的集群效果,参考官方文档:https://redis.io/topics/cluster-tutorial
原文地址:https://www.cnblogs.com/lay2017/p/9275677.html