简单说下自己测试搭建简单的Redis集群的大体步骤:1.首先你的有6个redis(官方说最少6个,3master,3slave),可以先在一台机器上搭建,搭建到多台上应该只需要改变启动命令即可(可能需要一些ssh无密钥什么的,只是猜测)在网上随便可以找到的配置多个redis,(总体有两种方式,一种是虚拟的,貌似走的都是一个redis,一种是将配置好的redis复制成六份,配置相应的端口等,我选择的后者显得更真实一些)然后把他们全部打开,可以写一个脚本,或者一个一个打开,作为一个新世纪的年轻人,我当然选择一个一个打开它们......[root@localhost ~]# ps -ef | grep redis
root 3427 1 0 7月17 ? 00:02:59 src/redis-server *:6379
root 3454 1 0 7月17 ? 00:06:09 src/redis-server *:7001 [cluster]
root 3460 1 0 7月17 ? 00:06:19 src/redis-server *:7002 [cluster]
root 3467 1 0 7月17 ? 00:05:59 src/redis-server *:7003 [cluster]
root 3473 1 0 7月17 ? 00:05:59 src/redis-server *:7004 [cluster]
root 3477 1 0 7月17 ? 00:05:57 src/redis-server *:7005 [cluster]
root 5867 1 0 12:02 ? 00:00:06 src/redis-server *:7000 [cluster]
root 5938 5913 0 13:17 pts/1 00:00:00 grep --color=auto redis2.将6个独立redis设置为集群,so easy 一句话搞定。其中 --replicas 参数是将6台redis分别分配了主从关系(master挂掉slave可以顶替,但是还没有具体深入研究)./redis-trib.rb create --replicas 1 127.0.0.1:7000 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在开启过程中可能会遇到很多问题,各种奇怪的报错,那就要安装ruby和gem的一些东东,搞不明白是什么,反正就是依赖吧~ ,只能说按照这个来会绕开很多坑。# yum install ruby-devel.x86_64# wget http://rubygems.global.ssl.fastly.net/gems/redis-3.2.1.gem
# gem install -l ./redis-3.2.1.gem执行这些代码之后再去执行上面建立集群的命令,如果成功的话,会看到下面的样子:>>> Creating cluster
Connecting to node 127.0.0.1:7000: OK
Connecting to node 127.0.0.1:7001: OK
Connecting to node 127.0.0.1:7002: OK
Connecting to node 127.0.0.1:7003: OK
Connecting to node 127.0.0.1:7004: OK
Connecting to node 127.0.0.1:7005: OK
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7003 to 127.0.0.1:7000
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
M: ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: d3058a19483d7be5c30c042779e56130f6ebf074 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: 5814305e71552ab45c44b9b8233681a63c3a57b1 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
S: e50676757acbe7c6a21e8abf4eda26ababb08285 127.0.0.1:7003
replicates ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a
S: ab307ba26d6dabe8edb2f2a7287be6f01aa46d88 127.0.0.1:7004
replicates d3058a19483d7be5c30c042779e56130f6ebf074
S: 11174332eb6ad40c0327750536fa776d706caf85 127.0.0.1:7005
replicates 5814305e71552ab45c44b9b8233681a63c3a57b1
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 127.0.0.1:7000)
M: ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: d3058a19483d7be5c30c042779e56130f6ebf074 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: 5814305e71552ab45c44b9b8233681a63c3a57b1 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
M: e50676757acbe7c6a21e8abf4eda26ababb08285 127.0.0.1:7003
slots: (0 slots) master
replicates ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a
M: ab307ba26d6dabe8edb2f2a7287be6f01aa46d88 127.0.0.1:7004
slots: (0 slots) master
replicates d3058a19483d7be5c30c042779e56130f6ebf074
M: 11174332eb6ad40c0327750536fa776d706caf85 127.0.0.1:7005
slots: (0 slots) master
replicates 5814305e71552ab45c44b9b8233681a63c3a57b1
<span style="color:#009900;">[OK] All nodes agree about slots configuration.</span>
>>> Check for open slots...
>>> Check slots coverage...
<span style="color:#009900;">[OK] All 16384 slots covered.</span></span> 3.测试集群。可以用下面的命令查看集群的状态,从下面可以看出有4个master,2个slave~~~,这个是由于我太年轻kill了7000的redis又加入了进来,原先他的slave 7003 也变成了master顶替了他。[root@localhost src]# ./redis-trib.rb check 127.0.0.1:7000
Connecting to node 127.0.0.1:7000: OK
Connecting to node 127.0.0.1:7005: OK
Connecting to node 127.0.0.1:7003: OK
Connecting to node 127.0.0.1:7002: OK
Connecting to node 127.0.0.1:7001: OK
Connecting to node 127.0.0.1:7004: OK
>>> Performing Cluster Check (using node 127.0.0.1:7000)
M: 4eb95ab689288dbb3ebf7ed380a0593ec9daa878 127.0.0.1:7000
slots: (0 slots) master
0 additional replica(s)
S: 11174332eb6ad40c0327750536fa776d706caf85 127.0.0.1:7005
slots: (0 slots) slave
replicates 5814305e71552ab45c44b9b8233681a63c3a57b1
M: e50676757acbe7c6a21e8abf4eda26ababb08285 127.0.0.1:7003
slots:0-5460 (5461 slots) master
0 additional replica(s)
M: 5814305e71552ab45c44b9b8233681a63c3a57b1 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: d3058a19483d7be5c30c042779e56130f6ebf074 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: ab307ba26d6dabe8edb2f2a7287be6f01aa46d88 127.0.0.1:7004
slots: (0 slots) slave
replicates d3058a19483d7be5c30c042779e56130f6ebf074
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.可以进入redis中玩一玩:查了一下使用redis-cli命令的时候应该加上 -c ,意思是在集群模式下,否则你会以一种独立的redis进入,然后各种moved报错。看着存储位置跳来跳去,貌似简单的集群也就搭建完成了。[root@localhost src]# ./redis-cli -c -p 7000
127.0.0.1:7000> set linuxidc weikang
-> Redirected to slot [1357] located at 127.0.0.1:7003
OK
127.0.0.1:7003> set linuxidc qiang
OK
127.0.0.1:7003> set weikang linuxidc
-> Redirected to slot [12142] located at 127.0.0.1:7002
OK
127.0.0.1:7002> get linuxidc
-> Redirected to slot [1357] located at 127.0.0.1:7003
"linuxidc"
127.0.0.1:7003> get weikang
-> Redirected to slot [12142] located at 127.0.0.1:7002
"linuxidc"4.遗留的一些问题:(1)搭建的集群连接上客户端后,所有的redis只有db0可用,不知道是什么原因。(难道是互相之间只连接了db0吗?)(2)增删改节点还有待继续研究,不能只是单纯的写命令就可以了,要理解在什么场景下应该做如何的处理。(3)集群管理工具在redis 3.0之后自己出了一个叫做redis-sentinel的,这个需要着重研究。只有在深入理解的集群的意义和所配置的每个参数的含义之后,才能使用到生产环境中,以上只是个入门,学习redis集群才只是刚刚开始~~
更多详情见请继续阅读下一页的精彩内容: http://www.linuxidc.com/Linux/2015-08/122261p2.htm
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