redis集群操作

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一、原始集群( 6 节点 3 3 从):
1 )启动集群:
[root@bhz004 ~]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7001/redis.conf
[root@bhz004 ~]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7002/redis.conf
[root@bhz004 ~]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7003/redis.conf
[root@bhz004 ~]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7004/redis.conf
[root@bhz004 ~]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7005/redis.conf
[root@bhz004 ~]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7006/redis.conf
(2) 查看服务器运行状态:
[root@bhz004 ~]# ps -el | grep redis
5 S     0  1999     1  0  80   0 - 34359 ep_pol ?        00:00:00 redis-server
5 S     0  2003     1  0  80   0 - 34359 ep_pol ?        00:00:00 redis-server
5 S     0  2007     1  0  80   0 - 34359 ep_pol ?        00:00:00 redis-server
5 S     0  2011     1  0  80   0 - 34359 ep_pol ?        00:00:00 redis-server
5 S     0  2017     1  0  80   0 - 34359 ep_pol ?        00:00:00 redis-server
5 S     0  2023     1  0  80   0 - 34359 ep_pol ?        00:00:00 redis-server
(3) 查看集群状态
二、 新集群操作
(4) 我们新建俩个服务,按照之前搭建的集群方式新增俩个节点:(一主一从  master slave  
     Master 7007                Slave 7008
步骤一:创建 7007/7008 文件夹。拷贝 redis.conf 文件到对于的 7007,7008 目录下 要   进行修改配置文件。
     [root@bhz004 redis-cluster]# mkdir 7007
     [root@bhz004 redis-cluster]# mkdir 7008
     [root@bhz004 redis-cluster]# cd 7001
     [root@bhz004 7001]# cp redis.conf /usr/local/redis-cluster/7007/
     [root@bhz004 7001]# cp redis.conf /usr/local/redis-cluster/7008/
   [root@bhz004 7001]# vim /usr/local/redis-cluster/7007/redis.conf
修改内容如下:
    port:7007
      dir /usr/local/redis-cluster/7007/
      cluster-config-file nodes7007.conf
  [root@bhz004 7001]# vim /usr/local/redis-cluster/7008/redis.conf
修改内容如下:
    port:7008
      dir /usr/local/redis-cluster/7008/
      cluster-config-file nodes7008.conf
 
步骤二:启动 7007 7008 俩个服务并查看服务状态。
[root@bhz004 7001]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7007/redis.conf
[root@bhz004 7001]# /usr/local/redis/bin/redis-server /usr/local/redis-cluster/7008/redis.conf
[root@bhz004 7001]# ps -el | grep redis
 
(5) 学习 redis-trib 命令使用:
[root@bhz004 local]# cd /usr/local/redis3.0/src
[root@bhz004 src]# redis-trib.rb
 
1 create :创建一个集群环境 host1:port1 ... hostN:portN (集群中的主从节点比例)
2 call :可以执行 redis 命令
3 add-node :将一个节点添加到集群里,第一个参数为新节点的 ip:port ,第二个参数为集群中任意一个已经存在的节点的 ip:port
4 del-node :移除一个节点
5 reshard :重新分片
6 check :检查集群状态
 
(6) 新增一个主节点 7007 master
步骤一:使用 add-node 命令:绿色为新增节点,红色为已知存在节点
[root@bhz004 7001]#
/usr/local/redis3.0/src/redis-trib.rb add-node 192.168.1.171:7007   192.168.1.171:7001
 
输出如下:
>>> Adding node 192.168.1.171:7007 to cluster 192.168.1.171:7001
Connecting to node 192.168.1.171:7001: OK
Connecting to node 192.168.1.171:7006: OK
Connecting to node 192.168.1.171:7005: OK
Connecting to node 192.168.1.171:7004: OK
Connecting to node 192.168.1.171:7002: OK
Connecting to node 192.168.1.171:7003: OK
>>> Performing Cluster Check (using node 192.168.1.171:7001)
M: 614d0def75663f2620b6402a017014b57c912dad 192.168.1.171:7001
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: fa299e41c173fa807ba04684c2f5e5e185d5f7d0 192.168.1.171:7006
   slots: (0 slots) slave
   replicates 83df08875c7707878756364039df0a4c8658f272
S: adb99506ddccad332e09258565f2e5f4f456a150 192.168.1.171:7005
   slots: (0 slots) slave
   replicates 8aac82b63d42a1989528cd3906579863a5774e77
S: a69b98937844c6050ee5885266ccccb185a3f36a 192.168.1.171:7004
   slots: (0 slots) slave
   replicates 614d0def75663f2620b6402a017014b57c912dad
M: 8aac82b63d42a1989528cd3906579863a5774e77 192.168.1.171:7002
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
M: 83df08875c7707878756364039df0a4c8658f272 192.168.1.171:7003
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
Connecting to node 192.168.1.171:7007: OK
>>> Send CLUSTER MEET to node 192.168.1.171:7007 to make it join the cluster.
[OK] New node added correctly.
 
步骤二:查看集群状态:
[root@bhz004 src]# /usr/local/redis/bin/redis-cli -c -h 192.168.1.171 -p 7001
192.168.1.171:7001> cluster  nodes

注意:当添加节点成功以后,新增的节点不会有任何数据,因为它没有分配任何的 slot hash 槽)。我们需要为新节点手工分配 slot
 
(7) 7007 分配 slot 槽。
步骤一:使用 redis-trib 命令,找到集群中的任意一个主节点(红色位置表现集群中的任意一个主节点),对其进行重新分片工作。
[root@bhz004 7001]# /usr/local/redis3.0/src/redis-trib.rb reshard 192.168.1.171:7001
 
输出如下:
>>> Performing Cluster Check (using node 192.168.1.171:7001)
M: 614d0def75663f2620b6402a017014b57c912dad 192.168.1.171:7001
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: fa299e41c173fa807ba04684c2f5e5e185d5f7d0 192.168.1.171:7006
   slots: (0 slots) slave
   replicates 83df08875c7707878756364039df0a4c8658f272
S: adb99506ddccad332e09258565f2e5f4f456a150 192.168.1.171:7005
   slots: (0 slots) slave
   replicates 8aac82b63d42a1989528cd3906579863a5774e77
M: 382634a4025778c040b7213453fd42a709f79e28 192.168.1.171:7007
   slots: (0 slots) master
   0 additional replica(s)
S: a69b98937844c6050ee5885266ccccb185a3f36a 192.168.1.171:7004
   slots: (0 slots) slave
   replicates 614d0def75663f2620b6402a017014b57c912dad
M: 8aac82b63d42a1989528cd3906579863a5774e77 192.168.1.171:7002
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
M: 83df08875c7707878756364039df0a4c8658f272 192.168.1.171:7003
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
(提示一)
How many slots do you want to move (from 1 to 16384)? 200
(提示二)
What is the receiving node ID? 382634a4025778c040b7213453fd42a709f79e28
Please enter all the source node IDs.
  Type 'all' to use all the nodes as source nodes for the hash slots.
  Type 'done' once you entered all the source nodes IDs.
Source node #1: all
Ready to move 200 slots.
   Source nodes:
    M: 614d0def75663f2620b6402a017014b57c912dad 192.168.1.171:7001
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
    M: 8aac82b63d42a1989528cd3906579863a5774e77 192.168.1.171:7002
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
    M: 83df08875c7707878756364039df0a4c8658f272 192.168.1.171:7003
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
   Destination node:
    M: 382634a4025778c040b7213453fd42a709f79e28 192.168.1.171:7007
   slots: (0 slots) master
   0 additional replica(s)
  Resharding plan: (分片执行计划日志)
Moving slot 5461 from 8aac82b63d42a1989528cd3906579863a5774e77
...
Moving slot 0 from 614d0def75663f2620b6402a017014b57c912dad
...
    Moving slot 10923 from 83df08875c7707878756364039df0a4c8658f272
...
(提示三)
Do you want to proceed with the proposed reshard plan (yes/no)? yes
Moving slot 65 from 192.168.1.171:7001 to 192.168.1.171:7007:
...
Moving slot 10923 from 192.168.1.171:7003 to 192.168.1.171:7007:
...
Moving slot 5527 from 192.168.1.171:7002 to 192.168.1.171:7007:
...
1 提示一:是问你需要多少个槽移动到新的节点上,可以自己设置,比如 200 个槽。
2 提示二:是你需要把这 200 slot 槽移动到那个节点上去(需要指定节点 id ),然后下个提示输入 all 是指从所有主节点( 7001 7002 7003 )中分别抽取相应的槽数(一共为 200 个槽到指定的新节点中,并且会打印执行分片的计划。)
3 提示三:输入 yes 确认开始执行分片任务。在最后我们再次看一下集群状态:
 
如上图所示,现在我们的 7007 已经有 slot 槽了,也就是说可以在 7007 上进行读写数据啦!到此为止我们的 7007 已经加入到集群中啦,并且是主节点( Master
 
(8) 添加从节点( 7008 )到集群中去。
步骤一:还是需要执行 add-node 命令:
[root@bhz004 7001]#
/usr/local/redis3.0/src/redis-trib.rb add-node 192.168.1.171:7008 192.168.1.171:7001
 
提示添加成功后我们继续看一下集群的状态:
 
如图所示,还是一个 master 节点,没有被分配任何的 slot 槽。我们需要把它变成一个从节点。
 
步骤二:我们需要执行 replicate 命令来指定当前节点(从节点)的主节点 id 为哪个。
首先需要登录新加的 7008 节点的客户端,然后使用集群命令进行操作,把当前的 7008 slave )节点指定到一个主节点下(这里使用之前创建的 7007作为7008的 主节点,红色表示主节点 id
 
[root@bhz004 ~]# /usr/local/redis/bin/redis-cli -c -h 192.168.1.171 -p 7008
192.168.1.171:7008> cluster replicate 382634a4025778c040b7213453fd42a709f79e28
192.168.1.171:7008> OK (提示 OK 则操作成功)
 
我们继续看一下当前集群的状态,如下图:我们已经成功的把 7008 放到 7007 这个主节点下面了,到此为止我们已经成功的添加完一个从节点了。

(9) 我们可以对集群进行操作,来验证下是否可以进行读写(当然可以)。
(10) 我们现在尝试删除一个节点( 7008 slave
步骤一:删除从节点 7008 ,输入 del-node 命令,指定删除节点 ip 和端口,以及节点 id (红色为 7008 节点 id
[root@bhz004 7001]# /usr/local/redis3.0/src/redis-trib.rb del-node 192.168.1.171:7008 97b0e0115326833724eb0ffe1d0574ee34618e9f
 
输出如下:
>>> Removing node 97b0e0115326833724eb0ffe1d0574ee34618e9f from cluster 192.168.1.171:7008
Connecting to node 192.168.1.171:7008: OK
Connecting to node 192.168.1.171:7003: OK
Connecting to node 192.168.1.171:7006: OK
Connecting to node 192.168.1.171:7002: OK
Connecting to node 192.168.1.171:7005: OK
Connecting to node 192.168.1.171:7001: OK
Connecting to node 192.168.1.171:7004: OK
Connecting to node 192.168.1.171:7007: OK
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
 
步骤二:再次查看一下集群状态,如下图所示,我们已经成功的移除了 7008 slave 节点,另外我们发现移除一个节点以后,当前节点的服务进程也会随之销毁。可以使用 ps 命令查看当前的服务( ps -el | grep redis ),发现少了一个运行的 server ,也就是刚移除的 7008 从节点。
 
(11) 最后,我们尝试删除之前加入的主节点 7007 ,这个步骤会相对比较麻烦一些,因为主节点的里面是有分配了 slot 槽的,所以我们这里必须先把 7007 里的 slot 槽放入到其他的可用主节点中去,然后再进行移除节点操作才行,不然会出现数据丢失问题。
 
步骤一:删除 7007 master )节点之前,我们需要先把其全部的数据( slot 槽)移动到其他节点上去(目前只能把 master 的数据迁移到一个节点上,暂时做不了平均分配功能)。
 
[root@bhz004 7001]# /usr/local/redis3.0/src/redis-trib.rb reshard 192.168.1.171:7007
 
输出如下:
 
>>> Performing Cluster Check (using node 192.168.1.171:7007)
M: 382634a4025778c040b7213453fd42a709f79e28 192.168.1.171:7007
   slots:0-65,5461-5527,10923-10988 ( 199 slots ) master
   0 additional replica(s)
S: fa299e41c173fa807ba04684c2f5e5e185d5f7d0 192.168.1.171:7006
   slots: (0 slots) slave
   replicates 83df08875c7707878756364039df0a4c8658f272
S: a69b98937844c6050ee5885266ccccb185a3f36a 192.168.1.171:7004
   slots: (0 slots) slave
   replicates 614d0def75663f2620b6402a017014b57c912dad
M: 614d0def75663f2620b6402a017014b57c912dad 192.168.1.171:7001
   slots:66-5460 (5395 slots) master
   1 additional replica(s)
M: 8aac82b63d42a1989528cd3906579863a5774e77 192.168.1.171:7002
   slots:5528-10922 (5395 slots) master
   1 additional replica(s)
S: adb99506ddccad332e09258565f2e5f4f456a150 192.168.1.171:7005
   slots: (0 slots) slave
   replicates 8aac82b63d42a1989528cd3906579863a5774e77
M: 83df08875c7707878756364039df0a4c8658f272 192.168.1.171:7003
   slots:10989-16383 (5395 slots) master
   1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 199
(注释:这里不会是正好 200 个槽)
What is the receiving node ID? 614d0def75663f2620b6402a017014b57c912dad
(注释:这里是需要把数据移动到哪? 7001 的主节点 id
Please enter all the source node IDs.
  Type 'all' to use all the nodes as source nodes for the hash slots.
  Type 'done' once you entered all the source nodes IDs.
Source node #1: 382634a4025778c040b7213453fd42a709f79e28
(注释:这里是需要数据源,也就是我们的 7007 节点 id
Source node #2: done
(注释:这里直接输入 done 开始生成迁移计划)
 
Ready to move 199 slots.
   Source nodes:
    M: 382634a4025778c040b7213453fd42a709f79e28 192.168.1.171:7007
   slots:0-65,5461-5527,10923-10988 (199 slots) master
   0 additional replica(s)
   Destination node:
    M: 614d0def75663f2620b6402a017014b57c912dad 192.168.1.171:7001
   slots:66-5460 (5395 slots) master
   1 additional replica(s)
  Resharding plan:
Moving slot 0 from 382634a4025778c040b7213453fd42a709f79e28
...
Do you want to proceed with the proposed reshard plan (yes/no)?  Yes
(注释:这里输入 yes 开始迁移)
Moving slot 0 from 192.168.1.171:7007 to 192.168.1.171:7001:
...
 
到此为止我们已经成功的把 7007 主节点的数据迁移到 7001 上去了,我们可以看一下现在的集群状态如下图,你会发现 7007 下面已经没有任何数据( slot )槽了,证明迁移成功!
 
步骤二:最后我们直接使用 del-node 命令删除 7007 主节点即可(红色表示 7007 的节点 id )。
[root@bhz004 7001]# /usr/local/redis3.0/src/redis-trib.rb del-node 192.168.1.171:7007 382634a4025778c040b7213453fd42a709f79e28
输出如下:
>>> Removing node 382634a4025778c040b7213453fd42a709f79e28 from cluster 192.168.1.171:7007
Connecting to node 192.168.1.171:7007: OK
Connecting to node 192.168.1.171:7006: OK
Connecting to node 192.168.1.171:7004: OK
Connecting to node 192.168.1.171:7001: OK
Connecting to node 192.168.1.171:7002: OK
Connecting to node 192.168.1.171:7005: OK
Connecting to node 192.168.1.171:7003: OK
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node
最后:我们查看集群状态,一切还原为最初始状态啦! OK 结束!
 

此为博主(yjclsx)原创文章,如若转载请标明出处,谢谢!

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