Redis cluster configuration

Create a cluster configuration

1. redis edition ：6.2.6
2. With 6 individual redis,3 Lord 3 Take... For example .

Preparing for basic redis To configure

Create directory /opt/rediscluster, Replication based redis.conf This directory , And make changes

#  close AOF function 
appendonly no

Create a cluster profile

create a file ：redis6379.conf, Add content ：

include /opt/rediscluster/redis.conf
pidfile "/var/run/redis_6379.pid"
port 6379
dbfilename "dump6379.rdb"

#  Turn on cluster mode 
cluster-enabled yes

#  Specify node file name 
cluster-config-file nodes-6379.conf

#  Specify the node timeout 
cluster-node-timeout 15000

Copy redis6379.conf, Named as ：

1. redis6380.conf
2. redis6381.conf
3. redis6389.conf
4. redis6390.conf
5. redis6391.conf
   Then modify the digital part of each document , Change the number to be the same as the number in the file name .

for example ：redis6380.conf, Revised as follows ：

include /opt/rediscluster/redis.conf

#  modify  6379-> 6380
pidfile "/var/run/redis_6380.pid"

#  modify  6379-> 6380
port 6380

#  modify  6379-> 6380
dbfilename "dump6380.rdb"

#  Turn on cluster mode 
cluster-enabled yes

#  Specify node file name 
#  modify  6379-> 6380
cluster-config-file nodes-6380.conf

#  Specify the node timeout 
cluster-node-timeout 15000

The same applies to other configuration files .

Open clusters

start-up 6 individual redis-server

redis-server /opt/rediscluster/redis6379.conf
redis-server /opt/rediscluster/redis6380.conf
redis-server /opt/rediscluster/redis6381.conf
redis-server /opt/rediscluster/redis6389.conf
redis-server /opt/rediscluster/redis6390.conf
redis-server /opt/rediscluster/redis6391.conf

After starting , View current directory , Confirm that the specified dump.rdb and nodes.conf file .

Batch close redis-server

ps -ef | grep -v grep | grep redis |  awk -F' ' '{print $2}' | xargs kill -9

Create clusters

Get into redis Installation directory src Under the table of contents , perform ：

redis-cli --cluster create --cluster-replicas 1 192.168.10.102:6379 192.168.10.102:6380 192.168.10.102:6381 192.168.10.102:6389 192.168.10.102:6390 192.168.10.102:6391

1. –cluster create: Create clusters

2. –cluster-relicas: Number of cluster copies . Here is 1, yes 1 host 1 Slave mode , If set to 2（ namely ：2 Slave machine ） Will fail . Because there must be at least 3 Host computer , So set 2 Slave machine hour , Need at least 9 Nodes .

3. The last parameter lists all redis host IP Address and port number .

After execution , System prompt ：

>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383

# 6390 As 6379 Slave of 
Adding replica 192.168.10.102:6390 to 192.168.10.102:6379

# 6391 As 6380 Slave of 
Adding replica 192.168.10.102:6391 to 192.168.10.102:6380

# 6389 As 6381 Slave of 
Adding replica 192.168.10.102:6389 to 192.168.10.102:6381
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: 0e5eb18533395661e35ac4ebd5298f364e50ad04 192.168.10.102:6379
   slots:[0-5460] (5461 slots) master
M: 9eda6134015f3b415df60e813613a7cf14cdd2df 192.168.10.102:6380
   slots:[5461-10922] (5462 slots) master
M: 505b4fd96d38c68befe839257622cdcec1af35ca 192.168.10.102:6381
   slots:[10923-16383] (5461 slots) master
S: 7d919f337875f7bafcddd3c79a8ae1510202d39d 192.168.10.102:6389
   replicates 505b4fd96d38c68befe839257622cdcec1af35ca
S: b30918baa72b2aa7e564115e738f21145234b84c 192.168.10.102:6390
   replicates 0e5eb18533395661e35ac4ebd5298f364e50ad04
S: a6f714fa624e02a72374f235d5562fc022b143e2 192.168.10.102:6391
   replicates 9eda6134015f3b415df60e813613a7cf14cdd2df
Can I set the above configuration? (type 'yes' to accept): 

Input "yes" Can be confirmed .

Access cluster

redis-cli -c -p 6379

1: -c : Cluster pattern
2：-p : Any one of the clusters redis The port number of the service

After logging into the cluster , You can use ：cluster nodes Command to view the cluster status , The query results are as follows ：

# 6390 yes slave, Corresponding master yes 6379
b30918baa72b2aa7e564115e738f21145234b84c 192.168.10.102:[email protected] slave 0e5eb18533395661e35ac4ebd5298f364e50ad04 0 1640854465249 1 connected

# 6391 yes slave, Corresponding master yes 6380
a6f714fa624e02a72374f235d5562fc022b143e2 192.168.10.102:[email protected] slave 9eda6134015f3b415df60e813613a7cf14cdd2df 0 1640854465000 2 connected

# master, This is the currently logged in redis, Yes myself Mark , 0-5460 yes slot Number 
0e5eb18533395661e35ac4ebd5298f364e50ad04 192.168.10.102:[email protected] myself,master - 0 1640854462000 1 connected 0-5460

# master, 5461-10922 yes slot Number 
9eda6134015f3b415df60e813613a7cf14cdd2df 192.168.10.102:[email protected] master - 0 1640854467291 2 connected 5461-10922

# 6389 yes slave, Corresponding master yes 6381
7d919f337875f7bafcddd3c79a8ae1510202d39d 192.168.10.102:[email protected] slave 505b4fd96d38c68befe839257622cdcec1af35ca 0 1640854463201 3 connected

# master, 10923-16383 yes slot Number 
505b4fd96d38c68befe839257622cdcec1af35ca 192.168.10.102:[email protected] master - 0 1640854466271 3 connected 10923-16383