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This article mainly introduces in detail the operation steps of setting up a cluster in redis. The sample code in this article is very detailed and has a certain reference value. Interested friends can refer to it.

Brief description

In October 2018, Redis released a stable version of version 5.0, and introduced a variety of new features, one of which is to abandon the cluster mode of Ruby and change to redis-cli written in C language, which greatly reduces the complexity of cluster construction. Updates to the cluster can be found in the release notes for 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 see how the cluster is built. The connection is as follows

Https://redis.io/topics/cluster-tutorial

The following step is to build a Redis cluster with 6 nodes on a Linux server.

Operation steps

Create a directory

Create a new directory: / root/software/redis

Download the source code and decompress the compiler

Wget http://download.redis.io/releases/redis-5.0.0.tar.gztar xzf redis-5.0.0.tar.gzcd redis-5.0.0make

Create 6 Redis profiles

Six configuration files cannot be in the same directory, which we define here 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 contents of the configuration file are:

Port 7001 # Port cluster-enabled yes # enable Cluster Mode cluster-config-file nodes.confcluster-node-timeout 5000 # timeout appendonly yesdaemonize yes # running protected-mode no # non-protected Mode pidfile / var/run/redis_7001.pid in the background

Among them, port and pidfile need to be increased with 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 cluster-replicas 7001 192.168.2.40 cluster-replicas 7002 192.168.2.40 cluster-replicas 7003 192.168.2.40

After startup, you can see the success message, as follows:

> > Performing hash slots allocation on 6 nodes...Master [0]-> Slots 0-5460Master [1]-> Slots 5461-10922Master [2]-> Slots 10923-16383Adding replica 192.168.2.40 Trying to optimize slaves allocation for anti-affinity 7004 to 192.168.2.40:7001Adding replica 192.168.2.40 to 192.168.2.40 to 192.168.2.40 Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same Host as their masterM: 191c645200a8b4d267f71e3354c8248dbb533dde 192.168.2.40 slots 7001 slots: [0-5460] (5461 slots) masterM: 400a08d4e5a534c1b609988105d3e045395fbd12 192.168.2.40 slots 7002 slots: [5461-10822] (5462 slots) masterM: 684f6aa0fbccda295ce6818a8c01ee7255a7b002 192.168.2.40 slots 7003 slots: [10923-168.2.40 slots) masterS: f2701549ae98315b432d73b49d139ee77d5685b4 192.168.2.40 slots 7004 replicates 684f6aa0fbccda295ce6818a8c01ee7255a7b002S: 9fdc1e375436767ab815cbddd3df674f3bc2ca99 192.168.2.40 replicates 400a08d4e5a534c1b609988105d3e045395fbd12Can I set the above configuration 7005 replicates 191c645200a8b4d267f71e3354c8248dbb533ddeS: e7742888ed85b37cff4a98e861e99bb16e8bae2c 192.168.2.40 replicates 400a08d4e5a534c1b609988105d3e045395fbd12Can 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 clusterWaiting for the cluster to join.... > > Performing Cluster Check (using node 192.168.2.40 slots 7001) M: 191c645200a8b4d267f71e3354c8248dbb533dde 192.168.2.40 master 7001 slots: [0-5460] (5461 slots) master 1 additional replica (s) M: 684f6aa0fbccda295ce6818a8c01ee7255a7b002 192.168.2.40 master 7003 slots: [10923-16383] (5461 slots) master 1 additional replica (s) S: 9fdc1e375436767ab815cbddd3df674f3bc2ca99 192.168.2.40 master 7005 slots: (0 slots) slave replicates 191c645200a8b4d267f71e3354c8248dbb533ddeS: e7742888ed85b37cff4a98e861e99bb16e8bae2c 192.168.2.40 master 7006 slots: (0 slots) slave replicates 400a08d4e5a534c1b609988105d3e045395fbd12M: 400a08d4e5a534c1b609988105d3e045395fbd12 192.168.2.40 master 7002 slots: [5461-10922] (5462 slots) master 1 additional replica (s) S: f2701549ae98315b432d73b49d139ee77d5685b4 192.168.2.40 master 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 has been built.

This is the end of the operation steps for redis to set up a cluster. I hope the above content can be of certain reference value to everyone and can be put into practice. If you like this article, you might as well share it for more people to see.

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