redis集群搭建及问题的决方法（二）

Dear 丶 2022-05-09 07:22 209阅读 0赞

**一、准备好有三个主节点的集群**  
127.0.0.1:8000> cluster nodes  
8ce851252f32fcab268e77d3b3ed976d57d2f498 10.211.55.5:8000 myself,master - 0 0 1 connected 0-5460  
6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8001 master - 0 1538582282356 2 connected 5461-10922  
da7d09090520a0e6287ea12fe7f48225d6665f68 10.211.55.5:8002 master - 0 1538582283359 3 connected 10923-16383  
*测试了下，可以按key值转发到对应的槽道节点存放*  
127.0.0.1:8000> set name lihua  
\-> Redirected to slot \[5798\] located at 10.211.55.5:8001  
OK  
10.211.55.5:8001>

**二、动态添加主节点**  
\[root@cenos01 src\]\# ./redis-trib.rb add-node 10.211.55.5:8003 10.211.55.5:8000

> > > Adding node 10.211.55.5:8003 to cluster 10.211.55.5:8000  
> > > Performing Cluster Check (using node 10.211.55.5:8000)  
> > > M: 8ce851252f32fcab268e77d3b3ed976d57d2f498 10.211.55.5:8000  
> > > slots:0-5460 (5461 slots) master  
> > > 0 additional replica(s)  
> > > M: 6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8001  
> > > slots:5461-10922 (5462 slots) master  
> > > 0 additional replica(s)  
> > > M: da7d09090520a0e6287ea12fe7f48225d6665f68 10.211.55.5:8002  
> > > slots:10923-16383 (5461 slots) master  
> > > 0 additional replica(s)  
> > > \[OK\] All nodes agree about slots configuration.
> 
> > > Check for open slots…  
> > > Check slots coverage…  
> > > \[OK\] All 16384 slots covered.
> 
> > > Send CLUSTER MEET to node 10.211.55.5:8003 to make it join the cluster.  
> > > \[OK\] New node added correctly.

注意：8003是新节点，8000是集群中的任意一个节点

**三、添加成功后，查询集群节点信息，但此时还没有槽道**  
10.211.55.5:8001> cluster nodes  
**da23623c6e915de5256bb2252cd1057d4f29e558 10.211.55.5:8003 master - 0 1538583102565 0 connected**  
6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8001 myself,master - 0 0 2 connected 5461-10922  
8ce851252f32fcab268e77d3b3ed976d57d2f498 10.211.55.5:8000 master - 0 1538583103571 1 connected 0-5460  
da7d09090520a0e6287ea12fe7f48225d6665f68 10.211.55.5:8002 master - 0 1538583104576 3 connected 10923-16383  
10.211.55.5:8001>

**四、动态添加从节点**  
把8004作为8001的从节点加入到集群中  
–slave 指定当前节点以从节点角色添加到集群中  
–master-id 后面跟随主节点的masterid值,cluster nodes可以查看  
\[root@cenos01 src\]\# ./redis-trib.rb add-node --slave --master-id 6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8004 10.211.55.5:8000

## 五、添加完成后检查结果： ##

10.211.55.5:8001> cluster nodes  
da23623c6e915de5256bb2252cd1057d4f29e558 10.211.55.5:8003 master - 0 1538583619331 0 connected  
**3f3049540ba60e30080847e78ccf832f94961da2 10.211.55.5:8004 slave 6f4a31fc322725fc4ed453a588f344fed4f261bf 0 1538583620339 2 connected**  
6f4a31fc322725fc4ed453a588f344fed4f261bf 10.211.55.5:8001 myself,master - 0 0 2 connected 5461-10922  
8ce851252f32fcab268e77d3b3ed976d57d2f498 10.211.55.5:8000 master - 0 1538583622352 1 connected 0-5460  
da7d09090520a0e6287ea12fe7f48225d6665f68 10.211.55.5:8002 master - 0 1538583621346 3 connected 10923-16383

以上就是redis集群的搭建过程。

***为新添加的节点分配槽道信息见本人的下一篇博文***