Last article A Brief Talk on redis cluster Cluster The advantages of redis cluster architecture, the comparison between redis cluster and redis replication + sentinal, and the data fragmentation algorithm of redis cluster are mainly explained. The original hash algorithm and consistency hash algorithm + virtual nodes are also briefly introduced. From the title point of view, you know that this article mainly explains redis cluster cluster building, less gossip, we directly open up!

Environmental preparation:
centos6.5 minimal
redis-3.2.8
3 * Node

Note: The redis cluster cluster needs at least three master nodes, a highly available and robust distributed cluster. Each master recommends at least one slave, six machines for formal environment and at least three machines. In order to simulate cluster building, three virtual machines are used to build six instances of redis cluster.

redis installation

Install redis on each node (not here, refer to the blogger's previous comments) redis installation)

Introduction to redis cluster configuration

cluster-enabled <yes/no> //Whether to start redis cluster cluster cluster

cluster-config-file <filename> //Specify a file, the cluster redis instance holds the location of the cluster state, and the file mainly holds the information of other machines in the cluster, such as the upper and lower bounds of nodes, failover; this is what redis itself maintains.

cluster-node-timeout <milliseconds> //Node survival time-out, more than milliseconds time, the cluster thinks that the node downtime, master downtime will trigger the master-standby switch, slave downtime will not provide services.

redis cluster cluster cluster construction

Define 6 redis instance configuration files: 7001.conf, 7002.conf, 7003.conf, 7004.conf, 7005.conf, 7006.conf

redis cluster configuration

On each node redis performs the following operations, taking 7001 as an example

mkdir -p /etc/redis-cluster //Unified Catalogue for Cluster Information Preservation

mkdir -p /var/log/redis //Unified Storage Catalogue of Log Information

mkdir -p /var/redis/7001 // Persistence file of redis

Copy redis.conf under redis-3.2.8 to / etc/redis directory and rename it 7001.conf. The configuration information is modified as follows:

cd /usr/local/redis-3.2.8 && cp redis.conf /etc/redis/7001.conf

port 7001
cluster-enabled yes
cluster-config-file /etc/redis-cluster/node-7001.conf
cluster-node-timeout 15000
daemonize yes                           
pidfile /var/run/redis_7001.pid                         
dir  /var/redis/7001        
logfile /var/log/redis/7001.log
bind 192.168.43.16      
appendonly yes

Modify redis instance startup script

• Under / etc/init.d, put six startup scripts: redis_7001, redis_7002, redis_7003, redis_7004, redis_7005, redis_7006.

cd redis-3.2.8 && cp utils/redis_init_script /etc/init.d/redis_7001 && chmod 777 /etc/init.d/redis_*

• In each startup script, modify the corresponding port number

  vim redis_7001

Other 7002, 7003, 7004, 7005, 7006 repeat the above operations

Node-redis instance correspondence:

192.168.43.16 7001
192.168.43.16 7002
192.168.43.17 7003
192.168.43.17 7004
192.168.43.18 7005
192.168.43.18 7006

Creating Clusters

Start six redis instances, respectively

cd /etc/init.d/ && ./redis_7001 start
cd /etc/init.d/ && ./redis_7002 start
cd /etc/init.d/ && ./redis_7003 start
cd /etc/init.d/ && ./redis_7004 start
cd /etc/init.d/ && ./redis_7005 start
cd /etc/init.d/ && ./redis_7006 start

Create redis cluster through redis-trib.rb

redis-trib.rb requires a ruby environment, so you need to install ruby, just install it in a node, which is installed on 192.168.43.16 machine.

yum install -y ruby
yum install -y rubygems
gem install redis

cp /usr/local/redis-3.2.8/src/redis-trib.rb /usr/local/bin //Creating Soft Connections

Creating Clusters

redis-trib.rb create --replicas 1 192.168.43.16:7001 192.168.43.16:7002 192.168.43.17:7003 192.168.43.17:7004 192.168.43.18:7005 192.168.43.18:7006

Figure yes confirms that receiving the current allocation continues to complete cluster creation

Check cluster information

redis-trib.rb check 192.168.43.16:7001

Re-create the cluster

• Close all redis instances

pkill redis

• Clear Cluster Information Save Files

cd /etc/redis-cluster && rm -rf *

• Clear redis persistent data files

cd /var/redis/7001 && rm -rf *

• Recreate using the redis-trib.rb create --replicas command described above

redis-trib.rb create --replicas 1 192.168.43.16:7001 192.168.43.16:7002 192.168.43.17:7003 192.168.43.17:7004 192.168.43.18:7005 192.168.43.18:7006

Well, that's all for redis cluster cluster deployment in this chapter.

Above is the content of this chapter. If there is something wrong, please give more advice. Thank you.

For the convenience of those in need, all the software in this series is available. https://pan.baidu.com/s/1qYsJZfY

Chapter 2: Preview of redis cluster cluster