Detailed procedures for installing redis 3.0.6 and configuring the cluster under CentOS 7

Time:2019-10-24

Install dependencies


[[email protected]centos7-1 ~]# yum -y install gcc openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel gcc-c++ automake autoconf

Install redis


[[email protected] ~]# wget http://download.redis.io/releases/redis-3.0.6.tar.gz
[[email protected] ~]# tar xvf redis-3.0.6.tar.gz
[[email protected] ~]# cd redis-3.0.6/
[[email protected] redis-3.0.6]# make MALLOC=libc
[[email protected] redis-3.0.6]# make install

Start the server

Through the commandredis-serverTo start theredis server. As you can see from the output below, no configuration file is specified for this startup, and commands can be usedredis-server /path/to/redis.confTo specify the specific configuration file startup.


[[email protected] redis-3.0.6]# redis-server 
4435:C 25 Jan 11:40:48.816 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
4435:M 25 Jan 11:40:48.817 * Increased maximum number of open files to 10032 (it was originally set to 1024).
    _._             
   _.-``__ ''-._            
  _.-`` `. `_. ''-._   Redis 3.0.6 (00000000/0) 64 bit
 .-`` .-```. ```\/ _.,_ ''-._         
 ( '  ,  .-` | `, )  Running in standalone mode
 |`-._`-...-` __...-.``-._|'` _.-'|  Port: 6379
 | `-._ `._ /  _.-' |  PID: 4435
 `-._ `-._ `-./ _.-' _.-'         
 |`-._`-._ `-.__.-' _.-'_.-'|         
 | `-._`-._  _.-'_.-' |   http://redis.io  
 `-._ `-._`-.__.-'_.-' _.-'         
 |`-._`-._ `-.__.-' _.-'_.-'|         
 | `-._`-._  _.-'_.-' |         
 `-._ `-._`-.__.-'_.-' _.-'         
  `-._ `-.__.-' _.-'          
   `-._  _.-'           
    `-.__.-'            
4435:M 25 Jan 11:40:48.817 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
4435:M 25 Jan 11:40:48.817 # Server started, Redis version 3.0.6
4435:M 25 Jan 11:40:48.817 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
4435:M 25 Jan 11:40:48.817 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
4435:M 25 Jan 11:40:48.817 * DB loaded from disk: 0.000 seconds
4435:M 25 Jan 11:40:48.817 * The server is now ready to accept connections on port 6379

Up here, single nodeRedis server Now that the installation is complete, the next step is to configure and install the cluster.

Create six nodes in the cluster

Cluster configuration file

Cluster related configuration file changesredis.confIn the following places, each node has a different port because it is deployed on a single server.

[[email protected] redis-3.0.6]$ vi redis.conf 
# modify the following
port 7000
cluster-enabled yes
cluster-config-file nodes-7000.conf
cluster-node-timeout 5000
appendonly yes

Configuration files for each node

Create 6 folders, each representing a redis node. The folder is named with the port number of redis node, and the configuration file of each node is stored in the file.


[[email protected] redis-3.0.6]# mkdir /usr/local/redis-cluster
[[email protected] redis-3.0.6]# cd /usr/local/redis-cluster
[[email protected] redis-cluster]# mkdir 7000 7001 7002 7003 7004 7005

copyredis.confCopy to 6 folders


[[email protected] redis-cluster]# cp ~/redis-3.0.6/redis.conf 7000
[[email protected] redis-cluster]# cp ~/redis-3.0.6/redis.conf 7001
[[email protected] redis-cluster]# cp ~/redis-3.0.6/redis.conf 7002
[[email protected] redis-cluster]# cp ~/redis-3.0.6/redis.conf 7003
[roo[email protected] redis-cluster]# cp ~/redis-3.0.6/redis.conf 7004
[[email protected] redis-cluster]# cp ~/redis-3.0.6/redis.conf 7005

And modify the content in each configuration to the port of the respective node, noteport andcluster-config-fileMust be unique.

Start each node separately


[[email protected] ~]# redis-server /usr/local/redis-cluster/7000/redis.conf
[[email protected] ~]# redis-server /usr/local/redis-cluster/7001/redis.conf
[[email protected] ~]# redis-server /usr/local/redis-cluster/7002/redis.conf
[[email protected] ~]# redis-server /usr/local/redis-cluster/7003/redis.conf
[[email protected] ~]# redis-server /usr/local/redis-cluster/7004/redis.conf
[[email protected] ~]# redis-server /usr/local/redis-cluster/7005/redis.conf

View the process when the startup is complete


[[email protected] ~]# ps -ef | grep redis
root  4704 2177 0 12:12 pts/0 00:00:07 redis-server *:7000 [cluster]
root  4707 4599 0 12:12 pts/1 00:00:07 redis-server *:7001 [cluster]
root  4710 4638 0 12:12 pts/2 00:00:07 redis-server *:7002 [cluster]
root  4752 4717 0 12:12 pts/3 00:00:07 redis-server *:7003 [cluster]
root  4788 4759 0 12:12 pts/4 00:00:07 redis-server *:7004 [cluster]
root  4824 4795 0 12:13 pts/5 00:00:07 redis-server *:7005 [cluster]
root  9018 8984 0 14:08 pts/6 00:00:00 grep --color=auto redis

Set up the Redis cluster

The above steps have created and started six nodes, each of which will be added to a cluster. Redis has provided us with a script for the cluster operationredis-trib.rbIt’s easy to do. Go ahead.

Install ruby

Ruby scripts are required for cluster operationsredis-trib.rb, so install ruby and rubygems


[[email protected] ~]# yum -y install ruby rubygems
[[email protected] ~]# gem install redis --version 3.0.6
Fetching: redis-3.0.6.gem (100%)
Successfully installed redis-3.0.6
Parsing documentation for redis-3.0.6
Installing ri documentation for redis-3.0.6
1 gem installed

redis-trib.rbRedis is a ruby scripting tool for setting up and managing redis clusters redis-trib.rbto /usr/local/bin/


[[email protected] redis-3.0.6]$ cp src/redis-trib.rb /usr/local/bin/

Create the cluster


[[email protected] ~]# redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7003 to 127.0.0.1:7000
Adding replica 127.0.0.1:7004 to 127.0.0.1:7001
Adding replica 127.0.0.1:7005 to 127.0.0.1:7002
M: d900d3667196121f95bdbd68ca2317926a6950bc 127.0.0.1:7000
 slots:0-5460 (5461 slots) master
M: b662853288cc89a3b78f70120d57c0a34f6a91d5 127.0.0.1:7001
 slots:5461-10922 (5462 slots) master
M: 6dc5ee101c2432ec4c1d934d54a6a3565116bbff 127.0.0.1:7002
 slots:10923-16383 (5461 slots) master
S: d18e50ac6aff2f612fac43da74a79288aa574c87 127.0.0.1:7003
 replicates d900d3667196121f95bdbd68ca2317926a6950bc
S: 85f6455e14d03ebaefeca3dbe3c78c92f2f76ead 127.0.0.1:7004
 replicates b662853288cc89a3b78f70120d57c0a34f6a91d5
S: 89d792acda7f2c99c95b0d3947572647cf9edc67 127.0.0.1:7005
 replicates 6dc5ee101c2432ec4c1d934d54a6a3565116bbff
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 127.0.0.1:7000)
M: d900d3667196121f95bdbd68ca2317926a6950bc 127.0.0.1:7000
 slots:0-5460 (5461 slots) master
M: b662853288cc89a3b78f70120d57c0a34f6a91d5 127.0.0.1:7001
 slots:5461-10922 (5462 slots) master
M: 6dc5ee101c2432ec4c1d934d54a6a3565116bbff 127.0.0.1:7002
 slots:10923-16383 (5461 slots) master
M: d18e50ac6aff2f612fac43da74a79288aa574c87 127.0.0.1:7003
 slots: (0 slots) master
 replicates d900d3667196121f95bdbd68ca2317926a6950bc
M: 85f6455e14d03ebaefeca3dbe3c78c92f2f76ead 127.0.0.1:7004
 slots: (0 slots) master
 replicates b662853288cc89a3b78f70120d57c0a34f6a91d5
M: 89d792acda7f2c99c95b0d3947572647cf9edc67 127.0.0.1:7005
 slots: (0 slots) master
 replicates 6dc5ee101c2432ec4c1d934d54a6a3565116bbff
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

The abovecreate Command created cluster, options–replicas 1Each saidMaster You need oneSlave. So the result is that three are created in the clusterMaster Nodes and 3Slave Node.

In the above information, M representsMaster Node, SSlave Node.

Three groups can be seenMaster andSlave The relationship is as follows:


M: d900d3667196121f95bdbd68ca2317926a6950bc -> S: d18e50ac6aff2f612fac43da74a79288aa574c87
M: 6dc5ee101c2432ec4c1d934d54a6a3565116bbff -> S: 89d792acda7f2c99c95b0d3947572647cf9edc67
M: b662853288cc89a3b78f70120d57c0a34f6a91d5 -> S: 85f6455e14d03ebaefeca3dbe3c78c92f2f76ead

Detect the status of the cluster


[[email protected] ~]# redis-trib.rb check 127.0.0.1:7000
>>> Performing Cluster Check (using node 127.0.0.1:7000)
M: d900d3667196121f95bdbd68ca2317926a6950bc 127.0.0.1:7000
 slots:0-5460 (5461 slots) master
 1 additional replica(s)
M: 6dc5ee101c2432ec4c1d934d54a6a3565116bbff 127.0.0.1:7002
 slots:10923-16383 (5461 slots) master
 1 additional replica(s)
S: 89d792acda7f2c99c95b0d3947572647cf9edc67 127.0.0.1:7005
 slots: (0 slots) slave
 replicates 6dc5ee101c2432ec4c1d934d54a6a3565116bbff
S: d18e50ac6aff2f612fac43da74a79288aa574c87 127.0.0.1:7003
 slots: (0 slots) slave
 replicates d900d3667196121f95bdbd68ca2317926a6950bc
S: 85f6455e14d03ebaefeca3dbe3c78c92f2f76ead 127.0.0.1:7004
 slots: (0 slots) slave
 replicates b662853288cc89a3b78f70120d57c0a34f6a91d5
M: b662853288cc89a3b78f70120d57c0a34f6a91d5 127.0.0.1:7001
 slots:5461-10922 (5462 slots) master
 1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

Test cluster

usingredis-cli -c -pThe port number connects to the cluster


[[email protected] ~]# redis-cli -c -p 7000
127.0.0.1:7000> get hello
(nil)
127.0.0.1:7000> set hello "hello world"
OK
127.0.0.1:7000> get hello
"hello world"
127.0.0.1:7000> get name 
-> Redirected to slot [5798] located at 127.0.0.1:7001
(nil)
127.0.0.1:7001> set name "redis server"
OK
127.0.0.1:7001> get name
"redis server"

conclusion

The above is all about installing redis 3.0.6 and configuring the cluster under CentOS 7 system. I hope the content of this article can be of some help to your study or work. If you have any questions, you can leave a message to communicate.