Brief description
In October 2018, Redis released the stable version 5.0, launching various new features, one of which was to give up Ruby's clustering method is changed to the redis-cli method written in C language, which greatly reduces the complexity of cluster construction. Updates about the cluster can be seen in the version notes of Redis5, as follows:
The cluster manager was ported from Ruby (redis-trib.rb) to C code inside redis-cli. check `redis-cli --cluster help ` for more info.
You can check the Redis official website to view the cluster construction method, the link is as follows
https://redis.io/topics/ cluster-tutorial
The following steps are to build a Redis cluster with 6 nodes on a Linux server.
Operation steps
Create directory
New directory:/root/software/redis
Download the source code and unzip and compile
wget http://download.redis.io/releases/redis-5.0.0.tar.gz tar xzf redis-5.0.0.tar.gz cd redis-5.0.0 make
Create 6 Redis configuration files
The 6 configuration files cannot be in the same directory. Here we define it as follows:
/root/software/redis/redis-cluster-conf/7001/redis.conf /root/software/redis/redis-cluster-conf/7002/redis.conf /root/software/redis/redis-cluster-conf/7003/redis.conf /root/software/redis/redis-cluster-conf/7004/redis.conf /root/software/redis/redis-cluster-conf/7005/redis.conf /root/software/redis/redis-cluster-conf/7006/redis.conf
The content of the configuration file is:
port 7001 #端口 cluster-enabled yes #启用集群模式 cluster-config-file nodes.conf cluster-node-timeout 5000 #超时时间 appendonly yes daemonize yes #后台运行 protected-mode no #非保护模式 pidfile /var/run/redis_7001.pid
The port and pidfile need to be adjusted according to different folders
Start the node
/root/software/redis/redis-5.0.0/src/redis-server /root/software/redis/redis-cluster-conf/7001/redis.conf /root/software/redis/redis-5.0.0/src/redis-server /root/software/redis/redis-cluster-conf/7002/redis.conf /root/software/redis/redis-5.0.0/src/redis-server /root/software/redis/redis-cluster-conf/7003/redis.conf /root/software/redis/redis-5.0.0/src/redis-server /root/software/redis/redis-cluster-conf/7004/redis.conf /root/software/redis/redis-5.0.0/src/redis-server /root/software/redis/redis-cluster-conf/7005/redis.conf /root/software/redis/redis-5.0.0/src/redis-server /root/software/redis/redis-cluster-conf/7006/redis.conf
Start the cluster
/root/software/redis/redis-5.0.0/src/redis-cli --cluster create 192.168.2.40:7001 192.168.2.40:7002 192.168.2.40:7003 192.168.2.40:7004 192.168.2.40:7005 192.168.2.40:7006 --cluster-replicas 1
After startup, you can see the success message, as follows:
>>> Performing hash slots allocation on 6 nodes... Master[0] -> Slots 0 - 5460 Master[1] -> Slots 5461 - 10922 Master[2] -> Slots 10923 - 16383 Adding replica 192.168.2.40:7004 to 192.168.2.40:7001 Adding replica 192.168.2.40:7005 to 192.168.2.40:7002 Adding replica 192.168.2.40:7006 to 192.168.2.40:7003 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: 191c645200a8b4d267f71e3354c8248dbb533dde 192.168.2.40:7001 slots:[0-5460] (5461 slots) master M: 400a08d4e5a534c1b609988105d3e045395fbd12 192.168.2.40:7002 slots:[5461-10922] (5462 slots) master M: 684f6aa0fbccda295ce6818a8c01ee7255a7b002 192.168.2.40:7003 slots:[10923-16383] (5461 slots) master S: f2701549ae98315b432d73b49d139ee77d5685b4 192.168.2.40:7004 replicates 684f6aa0fbccda295ce6818a8c01ee7255a7b002 S: 9fdc1e375436767ab815cbddd3df674f3bc2ca99 192.168.2.40:7005 replicates 191c645200a8b4d267f71e3354c8248dbb533dde S: e7742888ed85b37cff4a98e861e99bb16e8bae2c 192.168.2.40:7006 replicates 400a08d4e5a534c1b609988105d3e045395fbd12 Can I set the above configuration? (type 'yes' 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 192.168.2.40:7001) M: 191c645200a8b4d267f71e3354c8248dbb533dde 192.168.2.40:7001 slots:[0-5460] (5461 slots) master 1 additional replica(s) M: 684f6aa0fbccda295ce6818a8c01ee7255a7b002 192.168.2.40:7003 slots:[10923-16383] (5461 slots) master 1 additional replica(s) S: 9fdc1e375436767ab815cbddd3df674f3bc2ca99 192.168.2.40:7005 slots: (0 slots) slave replicates 191c645200a8b4d267f71e3354c8248dbb533dde S: e7742888ed85b37cff4a98e861e99bb16e8bae2c 192.168.2.40:7006 slots: (0 slots) slave replicates 400a08d4e5a534c1b609988105d3e045395fbd12 M: 400a08d4e5a534c1b609988105d3e045395fbd12 192.168.2.40:7002 slots:[5461-10922] (5462 slots) master 1 additional replica(s) S: f2701549ae98315b432d73b49d139ee77d5685b4 192.168.2.40:7004 slots: (0 slots) slave replicates 684f6aa0fbccda295ce6818a8c01ee7255a7b002 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
At this point, the Reids cluster is completed.
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