How to implement Redis7.0 deployment cluster

Redis7.0 Deployment Cluster Detailed Version

The cluster architecture is a way to connect multiple computers through the network and use a unified management method to externally appear as a single computer providing services

The role of the cluster:

• Distribute the access pressure of a single server and achieve load balancing

• Distribute the storage of a single server Pressure and achieve scalability

• Reduce the business disaster caused by the downtime of a single server

1 , Redis cluster internal structure design

Data storage design

• Through algorithm design, calculate the location where the key should be saved

• All storage spaces are planned to be cut into 16384 parts, and each host saves a part. Each part represents a storage space, not a key storage space.

• The key is calculated according to the The results are placed in the corresponding storage space

• Enhance scalability (new storage space is added, officially called slot)

Internal communication design of the cluster

• Each database communicates with each other and saves the numbered data of the slot in each library

• Once hit, return directly

• Once a miss, inform the specific location

2. Building the internal structure of the cluster

In the virtual machine Start multiple windows for cluster construction demonstration

The main command is executed on themain command operation client

Modifyredis.confConfiguration file

Add the following content

cluster-enabled yes # 启动为节点
cluster-config-file nodes-6379.conf # cluster配置文件名，该文件属于自动生成，仅用于快速查找文件并查询文件内容
cluster-node-timeout 10000 # 节点服务响应超时时间，用于判定该节点是否下线或切换为从节点
cluster-migration-barrier <count> # master连接的slave最小数量

Quickly copy 5 points of the configuration file and replace the ports inside

[root@localhost conf]# sed "s/6379/6380/g" redis-6379.conf > redis-6380.conf 
[root@localhost conf]# sed "s/6379/6381/g" redis-6379.conf > redis-6381.conf 
[root@localhost conf]# sed "s/6379/6382/g" redis-6379.conf > redis-6382.conf 
[root@localhost conf]# sed "s/6379/6383/g" redis-6379.conf > redis-6383.conf 
[root@localhost conf]# sed "s/6379/6384/g" redis-6379.conf > redis-6384.conf 
[root@localhost conf]# sed "s/6379/6385/g" redis-6379.conf > redis-6385.conf

After all execution, you can check the content through the cat command to ensure it has been modified

Start the redis service cluster

# 在第一个窗口执行6379服务
redis-server redis-6379.conf
# 在第二个窗口执行6380服务
redis-server redis-6380.conf
# 在第三个窗口执行6381服务
redis-server redis-6381.conf
# 下面的代码依次类推到6385

Execute the command to view redis Process and port

ps -ef | grep redis-

##Connection node

View in the src directory

redis-trib.rb

In higher versions, the startup operation has been moved to

redis-cli

Startup requires two downloads of two files, namely

ruby and gem

# 下载命令也会将gem一起
yum -y install rubygems

 # --cluster create 创建集群
 # --cluster-replicas 1 指定集群的内部结构（1代表一个master连接1个slave，2代表一个master连接两个save）
 # 后面的连接端口按数量实现master连接哪一个slave，1对1，1对2
 redis-cli --cluster create 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384 --cluster-replicas 1

The execution results are as follows

The results of viewing the configuration information are as follows

The information after executing the

yes command is as follows

Check the configuration file information again, which is recorded All cluster information

Start the client to store data

Because cluster deployment is used, the cluster can be operated through the

-c parameter, if not specified What is more, when operating the redis command, the prompt (error) MOVED 5798 127.0.0.1:6380

Note:

-cOperation cluster

redis-cli -c
# 创建key，通过返回信息可以知道key存储到6380下了
127.0.0.1:6379> set name 123
-> Redirected to slot [5798] located at 127.0.0.1:6380
OK

Specify the port to connect the client

# 连接指定的集群客户端
[root@localhost data]# redis-cli -c -p 6382
# 获取key
127.0.0.1:6382> get name
-> Redirected to slot [5798] located at 127.0.0.1:6380
"123"
127.0.0.1:6380>

Cluster node operation command

View cluster node information

cluster nodes

Enter a slave node redis and switch its master node

cluster replicate <master-id>

Discover a new node and add a new master node

cluster meet ip:port

Ignore a node without solt

cluster forget <id>

Manual failover

cluster failover

redis- trib command

Add node

redis-trib.rb add-node

Delete node

redis-trib.rb del-node

Reshard

redis-trib.rb reshard

3. Master-slave offline and master-slave switching

1. Simulate slave offline operation

Execute on the slave server

Ctrl CDownload service

Observe the status of the connected host , the host will mark the slave as failed if it cannot connect to the slave within 10 seconds. Other cluster services will fail to connect, and other services will receive the message

Start the slave again, and the host will reconnect. On the slave machine

If the master machine goes offline, the slave machine will switch to a certain slot. When the master machine comes back online, the original master machine will become the slave machine

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