简单说下自己测试搭建简单的Redis集群的大体步骤&＃xff1a;
1.首先你的有6个redis(官方说最少6个&＃xff0c;3master&＃xff0c;3slave)&＃xff0c;可以先在一台机器上搭建&＃xff0c;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&＃xff0c;只是猜测)
在网上随便可以找到的配置多个redis&＃xff0c;(总体有两种方式&＃xff0c;一种是虚拟的&＃xff0c;貌似走的都是一个redis&＃xff0c;一种是将配置好的redis复制成六份&＃xff0c;配置相应的端口等&＃xff0c;我选择的后者显得更真实一些)
然后把他们全部打开&＃xff0c;可以写一个脚本&＃xff0c;或者一个一个打开&＃xff0c;作为一个新世纪的年轻人&＃xff0c;我当然选择一个一个打开它们......
[root&＃64;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&＃61;auto redis
2.将6个独立redis设置为集群&＃xff0c;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&＃xff0c;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&＃xff0c;各种奇怪的报错&＃xff0c;那就要安装ruby和gem的一些东东&＃xff0c;搞不明白是什么&＃xff0c;反正就是依赖吧~ &＃xff0c;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&＃xff0c;如果成功的话&＃xff0c;会看到下面的样子&＃xff1a;
>>> 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 &＃39;yes&＃39; 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
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
3.测试集群。
可以用下面的命令查看集群的状态&＃xff0c;从下面可以看出有4个master&＃xff0c;2个slave~~~&＃xff0c;这个是由于我太年轻kill了7000的redis又加入了进来&＃xff0c;原先他的slave 7003 也变成了master顶替了他。
[root&＃64;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&＃xff1a;查了一下使用redis-cli命令的时候应该加上 -c &＃xff0c;意思是在集群模式下&＃xff0c;否则你会以一种独立的redis进入&＃xff0c;然后各种moved报错。
看着存储位置跳来跳去&＃xff0c;貌似简单的集群也就搭建完成了。
[root&＃64;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&＃xff1a;
(1)搭建的集群连接上客户端后&＃xff0c;所有的redis只有db0可用&＃xff0c;不知道是什么原因。(难道是互相之间只连接了db0吗&＃xff1f;)
(2)增删改节点还有待继续研究&＃xff0c;不能只是单纯的写命令就可以了&＃xff0c;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&＃xff0c;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&＃xff0c;才能使用到生产环境中&＃xff0c;以上只是个入门&＃xff0c;学习redis集群才只是刚刚开始~~
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